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diff --git a/History.txt b/History.txt new file mode 100644 index 000000000..8d2af7ea5 --- /dev/null +++ b/History.txt @@ -0,0 +1,2828 @@ +Documentation and download available at https://www.FreeRTOS.org/
+
+Changes between FreeRTOS V202012.00 and FreeRTOS V202012.00 released December 2020
+
+ + Includes libraries that are part of the FreeRTOS 202012.00 LTS release.
+ - Learn more at https:/freertos.org/lts-libraries.html
+ + Networking support for QEMU MPS2
+ + Demo Updates
+ - AWS IoT Jobs Library
+ - AWS Defender
+ - HTTP Mutual Auth
+ - HTTP Plaintext
+ - UDP for FreeRTOS+TCP
+ - S3 Upload & Download
+
+
+Changes between FreeRTOS V10.4.1 and FreeRTOS V202011.00 released November 10 2020
+
+ + Added new coreJSON Library. See https://www.freertos.org/json/
+ + Added new coreMQTT Library. See https://www.freertos.org/mqtt/
+ + Added new corePKCS11 Library. See https://www.freertos.org/pkcs11/
+ + Added new AWS IoT Device Shadow Library. See
+ https://www.freertos.org/iot-device-shadow/
+ + Updated to FreeRTOS Kernel v10.4.2. See
+ https://github.com/FreeRTOS/FreeRTOS-Kernel/blob/master/History.txt
+ + Updated to FreeRTOS+TCP v2.3.1. See
+ https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/blob/master/History.txt
+ + Update WolfSSL to 4.5.0 and add the WolfSSL FIPS ready demo.
+ + Convert most dependent libraries to Git submodules.
+ + Various general maintenance and improvements.
+
+
+Changes between FreeRTOS V10.4.0 and FreeRTOS V10.4.1 released September 17 2020
+ See https://www.FreeRTOS.org/FreeRTOS-V10.4.x.html
+
+ + Fixed an incorrectly named parameter that prevented the
+ ulTaskNotifyTakeIndexed macro compiling, and the name space clash in the
+ test code that prevented this error causing test failures.
+
+
+Changes between FreeRTOS V10.3.1 and FreeRTOS V10.4.0 released September 10 2020
+
+ See https://www.FreeRTOS.org/FreeRTOS-V10.4.x.html
+
+ Major enhancements:
+
+ + Task notifications: Prior to FreeRTOS V10.4.0 each created task had a
+ single direct to task notification. From FreeRTOS V10.4.0 each task has
+ an array of notifications. The direct to task notification API has been
+ extended with API functions postfixed with "Indexed" to enable the API to
+ operate on a task notification at any array index. See
+ https://www.freertos.org/RTOS-task-notifications.html for more information.
+ + Kernel ports that support memory protection units (MPUs): The ARMv7-M and
+ ARMv8-M MPU ports now support a privilege access only heap. The ARMv7-M
+ MPU ports now support devices that have 16 MPU regions, have the ability
+ to override default memory attributes for privileged code and data
+ regions, and have the ability to place the FreeRTOS kernel code outside of
+ the Flash memory. The ARMv8-M MPU ports now support tickless idle mode.
+ See https://www.freertos.org/FreeRTOS-MPU-memory-protection-unit.html
+ for more information.
+
+ Additional noteworthy updates:
+
+ + Code formatting is now automated to facilitate the increase in
+ collaborative development in Git. The auto-formated code is not identical
+ to the original formatting conventions. Most notably spaces are now used
+ in place of tabs.
+ + The prototypes for callback functions (those that start with "Application",
+ such as vApplicationStackOverflowHook()) are now in the FreeRTOS header
+ files, removing the need for application writers to add prototypes into
+ the C files in which they define the functions.
+ + New Renesas RXv3 port layer.
+ + Updates to the Synopsys ARC code, including support for EM and HS cores,
+ and updated BSP.
+ + Added new POSIX port layer that allows FreeRTOS to run on Linux hosts in
+ the same way the Windows port layer enables FreeRTOS to run on Windows
+ hosts.
+ + Many other minor optimisations and enhancements. For full details
+ see https://github.com/FreeRTOS/FreeRTOS-Kernel/commits/master
+
+
+Changes between FreeRTOS V10.3.0 and FreeRTOS V10.3.1 released February 18 2020
+
+ See https://www.FreeRTOS.org/FreeRTOS-V10.3.x.html
+
+ + ./FreeRTOS-Labs directory was removed from this file. The libraries it
+ contained are now available as a separate download.
+
+Changes between FreeRTOS V10.2.1 and FreeRTOS V10.3.0 released February 7 2020
+
+ See https://www.FreeRTOS.org/FreeRTOS-V10.3.x.html
+
+ New and updated kernel ports:
+
+ + Added RISC-V port for the IAR compiler.
+ + Update the Windows simulator port to use a synchronous object to prevent
+ a user reported error whereby a task continues to run for a short time
+ after being moved to the Blocked state. Note we were not able to
+ replicate the reported issue and it likely depends on your CPU model.
+ + Correct alignment of stack top in RISC-V port when
+ configISR_STACK_SIZE_WORDS is defined to a non zero value, which causes
+ the interrupt stack to be statically allocated.
+ + The RISC-V machine timer compare register can now be for any HART, whereas
+ previously it was always assumed FreeRTOS was running on HART 0.
+ + Update the sequence used to update the 64-bit machine timer
+ compare register on 32-bit cores to match that suggested in RISC-V
+ documentation.
+ + Added tickless low power modes into the ARM, IAR and GCC Cortex-M0 compiler
+ ports.
+ + Updated the behaviour of the ARMv7-M MPU (Memory Protection Unit) ports to
+ match that of the ARMv8-M ports whereby privilege escalations can only
+ originate from within the kernel's own memory segment. Added
+ configENFORCE_SYSTEM_CALLS_FROM_KERNEL_ONLY configuration constant.
+ + Update existing MPU ports to correctly disable the MPU before it is
+ updated.
+ + Added contributed port and demo application for a T-Head (formally C-SKY)
+ microcontroller.
+
+ New API functions:
+
+ + Added the vPortGetHeapStats() API function which returns information on
+ the heap_4 and heap_5 state.
+ + Added xTaskCatchUpTicks(), which corrects the tick count value after the
+ application code has held interrupts disabled for an extended period.
+ + Added xTaskNotifyValueClear() API function.
+ + Added uxTimerGetReloadMode() API function.
+
+ Other miscellaneous changes:
+ + Change type of uxPendedTicks from UBaseType_t to TickType_t to ensure it
+ has the same type as variables with which it is compared to, and therefore
+ also renamed the variable xPendingTicks.
+ + Update Keil projects that use the MPU so memory regions come from linker
+ script (scatter file) variables instead of being hard coded.
+ + Added LPC51U68 Cortex-M0+ demos for GCC (MCUXpresso), Keil and IAR
+ compilers.
+ + Added CORTEX_MPU_STM32L4_Discovery_Keil_STM32Cube demo.
+ + Added LPC54018 MPU demo.
+ + Rename xTaskGetIdleRunTimeCounter() to ulTaskGetIdleRunTimeCounter().
+
+
+Changes between FreeRTOS V10.2.1 and FreeRTOS V10.2.0 released May 13 2019:
+
+ + Added ARM Cortex-M23 port layer to complement the pre-existing ARM
+ Cortex-M33 port layer.
+ + The RISC-V port now automatically switches between 32-bit and 64-bit
+ cores.
+ + Introduced the portMEMORY_BARRIER macro to prevent instruction re-ordering
+ when GCC link time optimisation is used.
+ + Introduced the portDONT_DISCARD macro to the ARMv8-M ports to try and
+ prevent the secure side builds from removing symbols required by the
+ non secure side build.
+ + Introduced the portARCH_NAME to provide additional data to select semi-
+ automated build environments.
+ + Cortex-M33 and Cortex-M23 ports now correctly disable the MPU before
+ updating the MPU registers.
+
+ + Added Nuvoton NuMaker-PFM-M2351 ARM Cortex-M23 demo.
+ + Added LPC55S69 ARM Cortex-M33 demo.
+ + Added an STM32 dual core AMP stress test demo.
+
+
+Changes between FreeRTOS V10.1.1 and FreeRTOS V10.2.0 released February 25 2019:
+
+ + Added GCC RISC-V MCU port with three separate demo applications.
+ + Included pre-existing ARM Cortex-M33 (ARMv8-M) GCC/ARMclang and IAR ports
+ with Keil simulator demo.
+ + Update the method used to detect if a timer is active. Previously the
+ timer was deemed to be inactive if it was not referenced from a list.
+ However, when a timer is updated it is temporarily removed from, then
+ re-added to a list, so now the timer's active status is stored separately.
+ + Add vTimerSetReloadMode(), xTaskGetIdleRunTimeCounter(), and
+ xTaskGetApplicationTaskTagFromISR() API functions.
+ + Updated third party Xtensa port so it is MIT licensed.
+ + Added configINCLUDE_PLATFORM_H_INSTEAD_OF_IODEFINE_H to the Renesas
+ compiler RX600v2 port to enable switching between platform.h and
+ iodefine.h includes within that port's port.c file.
+ + Removed the 'FromISR' functions from the MPU ports as ISRs run privileged
+ anyway.
+ + Added uxTaskGetStackHighWaterMark2() function to enable the return type to
+ be changed without breaking backward compatibility.
+ uxTaskGetStackHighWaterMark() returns a UBaseType_t as always,
+ uxTaskGetStackHighWaterMark2() returns configSTACK_DEPTH_TYPE to allow the
+ user to determine the return type.
+ + Fixed issues in memory protected ports related to different combinations
+ of static memory only and dynamic memory only builds. As a result the
+ definition of tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE became more
+ complex and was moved to FreeRTOS.h with a table explaining its definition.
+ + Added a 'get task tag from ISR' function.
+ + Change the method used to determine if a timer is active or not from just
+ seeing if it is referenced from the active timer list to storing its
+ active state explicitly. The change prevents the timer reporting that it
+ is inactive while it is being moved from one list to another.
+ + The pcName parameter passed into the task create functions can be NULL,
+ previously a name had to be provided.
+ + When using tickless idle, prvResetNextTaskUnblockTime() is now only called
+ in xTaskRemoveFromEventList() if the scheduler is not suspended.
+ + Introduced portHAS_STACK_OVERFLOW_CHECKING, which should be set to 1 for
+ FreeRTOS ports that run on architectures that have stack limit registers.
+
+
+Changes between FreeRTOS V10.1.0 and FreeRTOS V10.1.1 released 7 September 2018
+
+ + Reverted a few structure name changes that broke several kernel aware
+ debugger plug-ins.
+ + Updated to the latest trace recorder code.
+ + Fixed some formatting in the FreeRTOS+TCP TCP/IP stack code.
+ + Reverted moving some variables from file to function scope as doing so
+ broke debug scenarios that require the static qualifier to be removed.
+
+Changes between FreeRTOS V10.0.1 and FreeRTOS V10.1.0 released 22 August 2018
+
+ FreeRTOS Kernel Changes:
+
+ + Update lint checked MISRA compliance to use the latest MISRA standard, was
+ previously using the original MISRA standard.
+ + Updated all object handles (TaskHandle_t, QueueHandle_t, etc.) to be
+ unique types instead of void pointers, improving type safety. (this was
+ attempted some years back but had to be backed out due to bugs in some
+ debuggers). Note this required the pvContainer member of a ListItem_t
+ struct to be renamed - set configENABLE_BACKWARD_COMPATIBILITY to 1 if
+ this causes an issue.
+ + Added configUSE_POSIX_ERRNO to enable per task POSIX style errno
+ functionality in a more user friendly way - previously the generic thread
+ local storage feature was used for this purpose.
+ + Added Xtensa port and demo application for the XCC compiler.
+ + Changed the implementation of vPortEndScheduler() for the Win32 port to
+ simply call exit( 0 ).
+ + Bug fix in vPortEnableInterrupt() for the GCC Microblaze port to protect
+ the read modify write access to an internal Microblaze register.
+ + Fix minor niggles when the MPU is used with regards to prototype
+ differences, static struct size differences, etc.
+ + The usStackHighWaterMark member of the TaskStatus_t structure now has type
+ configSTACK_DEPTH_TYPE in place of uint16_t - that change should have been
+ made when the configSTACK_DEPTH_TYPE type (which gets around the previous
+ 16-bit limit on stack size specifications) was introduced.
+ + Added the xMessageBufferNextLengthBytes() API function and likewise stream
+ buffer equivalent.
+ + Introduce configMESSAGE_BUFFER_LENGTH_TYPE to allow the number of bytes
+ used to hold the length of a message in the message buffer to be reduced.
+ configMESSAGE_BUFFER_LENGTH_TYPE default to size_t, but if, for example,
+ messages can never be more than 255 bytes it could be set to uint8_t,
+ saving 3 bytes each time a message is written into the message buffer
+ (assuming sizeof( size_t ) is 4).
+ + Updated the StaticTimer_t structure to ensure it matches the size of the
+ Timer_t structure when the size of TaskFunction_t does not equal the size
+ of void *.
+ + Update various Xilinx demos to use 2018.1 version of the SDK tools.
+ + Various updates to demo tasks to maintain test coverage.
+ + FreeRTOS+UDP was removed in FreeRTOS V10.1.0 as it was replaced by
+ FreeRTOS+TCP, which was brought into the main download in FreeRTOS
+ V10.0.0. FreeRTOS+TCP can be configured as a UDP only stack, and
+ FreeRTOS+UDP does not contain the patches applied to FreeRTOS+TCP.
+
+ FreeRTOS+TCP Changes:
+
+ + Multiple security improvements and fixes in packet parsing routines, DNS
+ caching, and TCP sequence number and ID generation.
+ + Disable NBNS and LLMNR by default.
+ + Add TCP hang protection by default.
+
+ We thank Ori Karliner of Zimperium zLabs Team for reporting these issues.
+
+
+Changes between FreeRTOS V10.0.0 and FreeRTOS V10.0.1, released December 20 2017
+
+ + Fix position of "#if defined( __cplusplus )" in stream_buffer.h.
+ + Correct declarations of MPU_xQueuePeek() and MPU_xQueueSemaphoreTake() in
+ mpu_prototypes.h.
+ + Correct formatting in vTaskList() helper function when it prints the state
+ of the currently executing task.
+ + Introduce #error if stream_buffer.c is built without
+ configUSE_TASK_NOTIFICATIONS set to 1.
+ + Update FreeRTOS+TCP to V2.0.0
+ - Improve the formatting of text that displays the available netword
+ interfaces when FreeRTOS+TCP is used on Windows with WinPCap.
+ - Introduce ipconfigSOCKET_HAS_USER_WAKE_CALLBACK option to enable a user
+ definable callback to execute when data arrives on a socket.
+
+Changes between FreeRTOS V9.0.1 and FreeRTOS V10.0.0:
+
+ The FreeRTOS kernel is now MIT licensed: https://www.FreeRTOS.org/license
+
+ New Features and components:
+
+ + Stream Buffers - see https://www.FreeRTOS.org/RTOS-stream-buffer-example.html
+ + Message Buffers - see https://www.FreeRTOS.org//RTOS-message-buffer-example.html
+ + Move FreeRTOS+TCP into the main repository, along with the basic Win32
+ TCP demo FreeRTOS_Plus_TCP_Minimal_Windows_Simulator.
+
+ New ports or demos:
+
+ + Added demo for TI SimpleLink CC3220 MCU.
+ + Added MPU and non MPU projects for Microchip CEC and MEC 17xx and 51xx
+ MCUs.
+ + Added CORTEX_MPU_Static_Simulator_Keil_GCC demo to test static allocation
+ in the MPU port.
+
+ Fixes or enhancements:
+
+ + Cortex-M ports push additional register prior to calling
+ vTaskSwitchContext to ensure 8-byte alignment is maintained. Only
+ important if a user defined tick hook function performs an operation that
+ requires 8-byte alignment.
+ + Optimisations to the implementation of the standard tickless idle mode on
+ Cortex-M devices.
+ + Improvements to the Win32 port including using higher priority threads.
+ + Ensure interrupt stack alignment on PIC32 ports.
+ + Updated GCC TriCore port to build with later compiler versions.
+ + Update mpu_wrappers.c to support static allocation.
+ + The uxNumberOfItems member of List_t is now volatile - solving an issue
+ when the IAR compiler was used with maximum optimization.
+ + Introduced configRECORD_STACK_HIGH_ADDRESS. When set to 1 the stack start
+ address is saved into each task's TCB (assuming stack grows down).
+ + Introduced configINCLUDE_FREERTOS_TASK_C_ADDITIONS_H to allow user defined
+ functionality, and user defined initialisation, to be added to FreeRTOS's
+ tasks.c source file. When configINCLUDE_FREERTOS_TASK_C_ADDITIONS_H is
+ set to 1 a user provided header file called freertos_task_c_additions.h
+ will be included at the bottom of tasks.c. Functions defined in that
+ header file can call freertos_tasks_c_additions_init(), which in turn
+ calls a macro called FREERTOS_TASKS_C_ADDITIONS_INIT(), if it is defined.
+ FREERTOS_TASKS_C_ADDITIONS_INIT() can be defined in FreeRTOSConfig.h.
+ + Introduced configPRE_SUPPRESS_TICKS_AND_SLEEP_PROCESSING( x ) which can be
+ defined by a user in FreeRTOSConfig.h. The macro is called before
+ assessing whether to enter tickless idle mode or not. If the macro sets
+ x to zero then tickless idle mode will not be entered. This allows users
+ to abort tickless idle mode entry before the tickless idle function is
+ even called - previously it was only possible to abort from within the
+ tickless idle function itself.
+ + Added configPRINTF(), which can be defined by users to allow all libraries
+ to use the same print formatter.
+ + Introduced configMAX() and configMIN() macros which default to standard
+ max( x, y ) and min( x, y ) macro behaviour, but can be overridden if the
+ application writer defines the same macros in FreeRTOSConfig.h.
+ + Corrected the definition of StaticTask_t in the case where
+ INCLUDE_xTaskAbortDelay is set to 1.
+ + Introduced configTIMER_SERVICE_TASK_NAME and configIDLE_TASK_NAME, both of
+ which can be defined to strings in FreeRTOSConfig.h to change the default
+ names of the timer service and idle tasks respectively.
+ + Only fill the stack of a newly created task with a known value if stack
+ checking, or high water mark checking/viewing, is in use - removing the
+ dependency on memset() in other cases.
+ + Introduced xTaskCreateRestrictedStatic() so static allocation can be used
+ with the MPU.
+ + Ensure suspended tasks cannot be unsuspended by a received task
+ notification.
+ + Fix race condition in vTaskSetTimeOutState().
+ + Updated trace recorder files to the latest version.
+
+Changes since FreeRTOS V9.0.0:
+
+ + Priority dis-inheritance behaviour has been enhanced in the case where a
+ task that attempted to take a mutex that was held by a lower priority task
+ timed out before it was able to obtain the mutex (causing the task that
+ holds the mutex to have its priority raised, then lowered again, in
+ accordance with the priority inheritance protocol).
+ + Split the overloaded xQueueGenericReceive() function into three separate
+ dedicated functions.
+ + Allow the default human readable text names given to the Idle and Timer
+ tasks to be overridden by defining the configIDLE_TASK_NAME and
+ configTIMER_SERVICE_TASK_NAME definitions respectively in FreeRTOSConfig.h.
+ + Introduced configINITIAL_TICK_COUNT to allow the tick count to take a
+ value of than than 0 when the system boots. This can be useful for
+ testing purposes - although setting configUSE_16_BIT_TICKS to 1 can also
+ be used to test frequent tick overflows.
+ + Ensure the Cortex-M SysTick count is cleared to zero before starting the
+ first task.
+ + Add configASSERT() into ARM Cortex-M ports to check the number of priority
+ bit settings.
+ + Clear the 'control' register before starting ARM Cortex-M4F ports in case
+ the FPU is used before the scheduler is started. This just saves a few
+ bytes on the main stack as it prevents space being left for a later save
+ of FPU registers.
+ + Added xSemaphoreGetMutexHolderFromISR().
+ + Corrected use of portNVIC_PENDSVSET to portNVIC_PENDSVSET_BIT in MPU ports.
+ + Introduced configSTACK_DEPTH_TYPE to allow users to change the type used
+ to specify the stack size when using xTaskCreate(). For historic reasons,
+ when FreeRTOS was only used on small MCUs, the type was set to uint16_t,
+ but that can be too restrictive when FreeRTOS is used on larger
+ processors. configSTACK_DEPTH_TYPE defaults to uint16_t.
+ xTaskCreateStatic(), being a newer function, used a uint32_t.
+ + Increase the priority of the Windows threads used by the Win32 port. As
+ all the threads run on the same core, and the threads run with very high
+ priority, there is a risk that the host will become unresponsive, so also
+ prevent the Windows port executing on single core hosts.
+
+Changes between FreeRTOS V9.0.0 and FreeRTOS V9.0.0rc2 released May 25 2016:
+
+ See https://www.FreeRTOS.org/FreeRTOS-V9.html
+
+ RTOS kernel updates:
+
+ + The prototype of the new xTaskCreateStatic() API function was modified to
+ remove a parameter and improve compatibility with other new
+ "CreateStatic()" API functions. The stack size parameter in
+ xTaskCreateStatic() is now uint32_t, which changes the prototype of the
+ callback functions. See the following URL:
+ https://www.FreeRTOS.org/xTaskCreateStatic.html
+ + GCC ARM Cortex-A port: Introduced the configUSE_TASK_FPU_SUPPORT
+ constant. When configUSE_TASK_FPU_SUPPORT is set to 2 every task is
+ automatically given a floating point (FPU) context.
+ + GCC ARM Cortex-A port: It is now possible to automatically save and
+ restore all floating point (FPU) registers on entry to each potentially
+ nested interrupt by defining vApplicationFPUSafeIRQHandler() instead of
+ vApplicationIRQHandler().
+ + All ARM Cortex-M3/4F/7 ports: Clear the least significant bit of the task
+ entry address placed onto the stack of a task when the task is created for
+ strict compliance with the ARM Cortex-M3/4/7 architecture documentation
+ (no noticeable effect unless using the QMEU emulator).
+ + Added GCC and Keil ARM Cortex-M4F MPU ports - previously the MPU was only
+ supported on ARM Cortex-M3.
+ + ARM Cortex-M3/4F MPU ports: Update to fully support the FreeRTOS V9.0.0
+ API (other than static object creation) and added the
+ FreeRTOS/Demo/CORTEX_MPU_Simulator_Keil_GCC demo application to
+ demonstrate how to use the updated MPU port.
+ + All ARM Cortex-M3/4F/7 ports: Add additional barrier instructions to the
+ default low power tickless implementation.
+ + All ARM Cortex-M0 ports: Prevent an item being left on the stack of the
+ first task that executes.
+ + Win32 ports: Reduce the amount of stack used and change the way Windows
+ threads are deleted to increase the maximum execution time.
+ + Add an ARM Cortex-M4F port for the MikroC compiler. Ensure to read the
+ documentation page for this port before use.
+ + MPS430X IAR port: Update to be compatible with the latest EW430 tools
+ release.
+ + IAR32 GCC port: Correct vPortExitCritical() when
+ configMAX_API_CALL_INTERRUPT_PRIORITY == portMAX_PRIORITY.
+ + For consistency vTaskGetTaskInfo() now has the alias vTaskGetInfo(),
+ xTaskGetTaskHandle() now has the alias xTaskGetHandle() and
+ pcQueueGetQueueName() now has an alias pcQueueGetName().
+ + Fix various errors in comments and compiler warnings.
+
+ Demo application updates:
+
+ + Update Atmel Studio projects to use Atmel Studio 7.
+ + Update Xilinx SDK projects to use the 2016.1 version of the SDK.
+ + Remove dependency on legacy IO libraries from the PIC32 demos.
+ + Move the Xilinx UltraScale Cortex-R5 demo into the main distribution.
+ + Update the MSP432 libraries to the latest version.
+ + Add Microchip CEC1302 (ARM Cortex-M4F) demos for GCC, Keil and MikroC
+ compilers.
+ + Move the Atmel SAMA5D2 demo into the main distribution.
+
+Changes between FreeRTOS V9.0.0rc1 and FreeRTOS V9.0.0rc2 (release candidate 2)
+released March 30 2016:
+
+ NOTE - See https://www.FreeRTOS.org/FreeRTOS-V9.html for details
+
+ + The functions that create RTOS objects using static memory allocation have
+ been simplified and will not revert to using dynamic allocation if a
+ buffer is passed into a function as NULL.
+ + Introduced the configSUPPORT_DYNAMIC_ALLOCATION configuration constant to
+ allow a FreeRTOS application to be built without a heap even being being
+ defined. The Win32 example located in the
+ /FreeRTOS/demo/WIN32-MSVC-Static-Allocation-Only directory is provided as
+ a reference for projects that do not include a FreeRTOS heap.
+ + Minor run-time optimisations.
+ + Two new low power tickless implementations that target Silicon Labs EFM32
+ microcontrollers.
+ + Addition of the xTimerGetPeriod() and xTimerGetExpireTime() API functions.
+
+Changes between FreeRTOS V8.2.3 and FreeRTOS V9.0.0rc1 (release candidate 1)
+released February 19 2016:
+
+ RTOS Kernel Updates:
+
+ + Major new feature - tasks, semaphores, queues, timers and event groups can
+ now be created using statically allocated memory, so without any calls to
+ pvPortMalloc().
+ + Major new features - Added the xTaskAbortDelay() API function which allows
+ one task to force another task to immediately leave the Blocked state,
+ even if the event the blocked task is waiting for has not occurred, or the
+ blocked task's timeout has not expired.
+ + Updates necessary to allow FreeRTOS to run on 64-bit architectures.
+ + Added vApplicationDaemonTaskStartupHook() which executes when the RTOS
+ daemon task (which used to be called the timer service task) starts
+ running. This is useful if the application includes initialisation code
+ that would benefit from executing after the scheduler has been started.
+ + Added the xTaskGetTaskHandle() API function, which obtains a task handle
+ from the task's name. xTaskGetTaskHandle() uses multiple string compare
+ operations, so it is recommended that it is called only once per task.
+ The handle returned by xTaskGetTaskHandle() can then be stored locally for
+ later re-use.
+ + Added the pcQueueGetQueueName() API function, which obtains the name of
+ a queue from the queue's handle.
+ + Tickless idling (for low power applications) can now also be used when
+ configUSE_PREEMPTION is 0.
+ + If one task deletes another task, then the stack and TCB of the deleted
+ task is now freed immediately. If a task deletes itself, then the stack
+ and TCB of the deleted task are freed by the Idle task as before.
+ + If a task notification is used to unblock a task from an ISR, but the
+ xHigherPriorityTaskWoken parameter is not used, then pend a context switch
+ that will then occur during the next tick interrupt.
+ + Heap_1.c and Heap_2.c now use the configAPPLICATION_ALLOCATED_HEAP
+ settings, which previously was only used by heap_4.c.
+ configAPPLICATION_ALLOCATED_HEAP allows the application writer to declare
+ the array that will be used as the FreeRTOS heap, and in-so-doing, place
+ the heap at a specific memory location.
+ + TaskStatus_t structures are used to obtain details of a task.
+ TaskStatus_t now includes the bae address of the task's stack.
+ + Added the vTaskGetTaskInfo() API function, which returns a TaskStatus_t
+ structure that contains information about a single task. Previously this
+ information could only be obtained for all the tasks at once, as an array
+ of TaskStatus_t structures.
+ + Added the uxSemaphoreGetCount() API function.
+ + Replicate previous Cortex-M4F and Cortex-M7 optimisations in some
+ Cortex-M3 port layers.
+
+ Demo Application Updates:
+
+ Further demo applications will be added prior to the final FreeRTOS V9
+ release.
+
+ + Updated SAM4L Atmel Studio project to use Atmel Studio 7.
+ + Added ARM Cortex-A53 64-bit port.
+ + Added a port and demo for the ARM Cortex-A53 64-bit cores on the Xilinx
+ Ultrascale MPSoC.
+ + Added Cortex-M7 SAME70 GCC demo.
+ + Added EFM32 Giant and Wonder Gecko demos.
+
+
+Changes between V8.2.2 and V8.2.3 released October 16, 2015
+
+ RTOS kernel updates:
+
+ + Fix bug identified in a modification made in V8.2.2 to the software timer
+ code that allows tickless low power applications to sleep indefinitely
+ when software timers are used.
+ + Simplify and improve efficiency of stack overflow checking.
+ + Add xTaskNotifyStateClear() API function.
+ + New IAR and GCC Cortex-R ports for microprocessors that do not use an ARM
+ generic interrupt controller (GIC).
+ + New PIC32MEC14xx port.
+ + Add support for PIC32MZ EF parts (with floating point) into the PIC32MZ
+ port.
+ + Zynq7000 port layer now declares the functions that setup and clear the
+ tick interrupt as weak symbols so they can be overridden by the
+ application, and uses a global XScuGic object so the same object can be
+ used by the application code.
+ + Introduced configUSE_TASK_FPU_SUPPORT, although the PIC32MZ EF port is
+ currently the only port that uses it.
+ + Updates to RL78 and 78K0 IAR port layers to improve support for
+ combinations of memory models.
+ + Minor updates to heap_5.c to remove compiler warnings generated by some
+ compilers.
+ + License simplifications. See /FreeRTOS/License/license.txt in the
+ official distribution.
+
+ FreeRTOS+ updates:
+
+ + Update directory names to use WolfSSL instead of CyaSSL, inline with
+ WolfSSL's re-branding.
+ + Update to latest WolfSSL code.
+ + Update to latest FreeRTOS+Trace recorder code.
+ + Add in the FreeRTOS+Trace recorder library required for streaming trace.
+
+ Demo application changes:
+
+ + Add demo applications for Renesas RZ/T (Cortex-R), PIC32MZ EF (PIC32 with
+ floating point hardware), PIC32MEC14xx, RX71M, RX113 and RX231.
+ + General tidy up of spelling and compiler warnings.
+
+
+Changes between V8.2.1 and V8.2.2 released August 12, 2015
+
+ RTOS kernel updates:
+
+ + Added Intel IA32/x86 32-bit port.
+ + General maintenance.
+ + PRIVILEGED_FUNCTION and PRIVILEGED_DATA macros, which are used in memory
+ protected systems, have been added to the newer event group and software
+ timer functions.
+ + Add the errno definitions used by FreeRTOS+ components into projdefs.h.
+ + Remove the restriction that prevented tick-less idle implementations
+ waiting indefinitely when software timers were used in the same
+ application.
+ + Introduce xTaskNotifyAndQueryFromISR() as the interrupt safe version of
+ xTaskNotifyAndQuery().
+ + Add additional NOPs to the MSP430X port layers to ensure strict compliance
+ with the hardware documentation.
+ + Microblaze port: Added option for port optimised task selection.
+ + Microblaze port: Previously tasks inherited the exception enable state
+ at the time the task was created. Now all tasks are created with
+ exceptions enabled if the Microblaze design supports exceptions.
+ + Windows port: Add additional safe guards to ensure the correct start up
+ sequence and thread switching timing.
+ + Windows port: Improve the implementation of the port optimised task
+ selection assembly code.
+ + Update heap_4 and heap_5 to allow use on 64-bit processors.
+ + Simplify the code that creates a queue.
+ + General improved tick-less idle behaviour.
+ + Ensure none of the variables in the common kernel files are initialised to
+ anything other than zero.
+ + Correct calculation of xHeapStructSize in heap_4 and heap_5.
+
+ Demo application updates:
+
+ + Added demo project for the new IA32/x86 port that targets the Galileo
+ hardware.
+ + Added MSP430FR5969 demos (previously provided as a separate download).
+ + Added FreeRTOS BSP repository for automatic creation of FreeRTOS
+ applications in the Xilinx SDK.
+ + Added Atmel Studio / GCC project for the SAMV71 (ARM Cortex-M7)
+ + Update Xilinx SDK projects to use version 2015.2 of the SDK.
+ + Remove Microblaze demos that were using obsolete tools.
+ + Add MSP43FR5969 IAR and CCS demos.
+
+ FreeRTOS+ Updates:
+
+ + Updated FreeRTOS+Trace recorder library, which requires an update to the
+ FreeRTOS+Trace application.
+ + Added Reliance Edge source code and demo application. Reliance edge is
+ a fail safe transactional file system ideal for applications that require
+ file storage, and especially when high reliability is essential.
+ + Introduce configAPPLICATION_PROVIDES_cOutputBuffer to allow FreeRTOS+CLI
+ users to place the output buffer at a fixed memory address.
+ + Improve the NetworkInterface.c file provided for the Windows port of
+ FreeRTOS+UDP.
+
+Changes between V8.2.0 and V8.2.1 released 24th March 2015.
+
+ RTOS kernel updates:
+
+ + Added user definable and flexible thread local storage facility.
+ + Added vTimerSetTimerID() API function to complement the pvTimerGetTimerID()
+ function to allow the timer's ID to be used as timer local storage.
+ + Fixed a potential issue related to the use of queue sets from an ISR.
+ + Some updates to the Xilinx Microblaze GCC port.
+ + Added ARM Cortex-M4F port for Texas Instruments Code Composer Studio.
+ + Added ARM Cortex-M7 r0p1 port layer for IAR, GCC and Keil which contains a
+ minor errata work around. All other ARM Cortex-M7 core revisions should
+ use the ARM Cortex-M4F port.
+ + Exclude the whole of croutine.c if configUSE_CO_ROUTINES is set to 0.
+ + Change some data types from uint32_t to size_t in preparation for 64-bit
+ Windows port.
+ + Update the PIC32 port to remove deprecation warnings output by the latest
+ XC32 compilers.
+ + Fix bug when xQueueOverwrite() and xQueueOverwrite() from ISR are used to
+ overwrite items in two queues that are part of the same set.
+
+ Demo application updates:
+
+ + Added demo application for TI's ARM Cortex-M4F based MSP432
+ microcontroller using IAR, Keil and CCS compilers.
+ + Added demo application for STM32F ARM Cortex-M7 based microcontroller
+ using IAR and Keil.
+ + Added demo application for Atmel SAMV71 ARM Cortex-M7 based
+ microcontroller using IAR and Keil.
+ + Added Microblaze demo that uses the 2014.4 version of the Xilinx SDK and
+ runs on the KC705 evaluation board (Kintex FPGA).
+
+Changes between V8.1.2 and V8.2.0 released 16th January 2015
+
+ Changes between release candidate 1 and the official release are restricted
+ to maintenance only.
+
+ Significant RTOS kernel updates:
+
+ + MAJOR NEW FEATURE! Task notifications. Please see the following URL for
+ details: https://www.FreeRTOS.org/RTOS-task-notifications.html
+ + NEW HEADER FILE REQUIRED! Obsolete definitions have been separated into
+ a new header file called FreeRTOS/Source/include/deprecated_definitions.h.
+ This header file must be present to build. Note some of the obsolete
+ definitions are still used by very old demo application projects.
+
+ Other RTOS kernel updates:
+
+ + Made xSemaphoreGiveFromISR() a function rather than a macro that calls
+ xQueueGenericSendFromISR(). This allows for major performance
+ enhancements at the expense of some additional code size if both functions
+ are used in the same application. NOTE: In most uses cases such use of
+ a semaphore can now be replaced with a task notification which is smaller
+ and faster still.
+ + The TCB is now always allocated such that the task's stack grows away from
+ the TCB (improves debugging of stack overflows as the overflow will not
+ overwrite the task's name).
+ + GCC, IAR and Keil Cortex-M4F ports now use more inlining (performance
+ enhancements at the cost of a little additional code space).
+ + Queues are now allocated with a single call to pvPortMalloc() which
+ allocates both the queue structure and the queue storage area.
+ + Introduced a new critical section macro for reading the tick count that
+ defines away to nothing in cases where the width of the tick allows the
+ tick count to be read atomically (performance benefits - especially when
+ optimisation is on).
+ + Introduced configAPPLICATION_ALLOCATED_HEAP in heap_4.c to allow the
+ application writer to provide their own heap array - and in so doing
+ control the location of the heap.
+ + Introduced configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES which, when set, will
+ include known values in both list and list item structures. The values
+ are intended to assist debugging. If the values get overwritten then it
+ is likely application code has written over RAM used by the kernel.
+ + configASSERT()s in all Cortex-M ports used to test the lowest 5 bits of
+ the interrupt control register to detect taskENTER_CRITICAL() being called
+ from an interrupt. This has been changed to test all 8 bits.
+ + Introduced uxTaskPriorityGetFromISR().
+ + Microblze V8 port now tests XPAR_MICROBLAZE_0_USE_FPU for inequality to 0
+ rather than equality to 1, and 2 and 3 are also valid values.
+ + Cortex-A5 GIC-less port no longer passes the address of the interrupting
+ peripheral into the interrupt handler.
+ + Fix an issue in FreeRTOS-MPU where an attempt was made to free the stack
+ belonging to a task when the task was deleted, even when the stack was
+ allocated statically.
+ + Utility (helper) functions that format task statistic information into
+ human readable tables now pad task names with spaces to ensure columns
+ line up correctly even where task name lengths vary greatly.
+ + Update FreeRTOS+Trace recorder library to version 2.7.0.
+
+ Demo application updates:
+
+ + Added two new standard demo task sets: IntSemTest and TaskNotify.
+ + Added port and demo application for Atmel SAMA5D4 Cortex-A5 MPU.
+ + Added demo application for Altera Cyclone V Cortex-A9 MPU.
+ + Updated Zynq demo to use version 2014.4 of Xilinx's SDK and added in
+ demo tasks for new RTOS features.
+ + Updated Atmel SAM4E and SAM4S demos to include a lot of additional test
+ and demo tasks.
+ + Fixed a corner case issue in Atmel SAM4L low power tickless
+ implementation, and added button interrupt handling.
+ + Make the interrupt queue tests more tolerant to heave CPU loads.
+ + Updated MSVC FreeRTOS simulator demo to include the latest standard test
+ and demo tasks.
+ + Updated MingW/Eclipse FreeRTOS simulator demo to match the FreeRTOS MSVC
+ simulator demo.
+ + Updated all demos that use FreeRTOS+Trace to work with the latest trace
+ recorder code.
+
+
+Changes between V8.1.1 and V8.1.2 released September 2nd 2014
+
+ Move the defaulting of configUSE_PORT_OPTIMISED_TASK_SELECTION into the
+ individual port layers where necessary so it does not affect ports that do
+ not support the definition.
+
+Changes between V8.1.0 and V8.1.1 released August 29th 2014
+
+ By popular requests - a minor patch to V8.1.0 to re-instate the ability to
+ give a mutex type semaphore (with priority inheritance) from an interrupt
+ handler.
+
+Changes between V8.0.1 and V8.1.0 released August 26th 2014
+
+ FreeRTOS scheduler, kernel, demo and test updates:
+
+ + Improved the priority inheritance algorithms to assist integration with
+ off the shelf middleware that may hold multiple mutexes simultaneously.
+ + Introduce heap_5.c, which is similar to heap_4.c but allows the heap to
+ span multiple non-contiguous memory regions.
+ + Updated all Cortex-A9 ports to help trap a couple of common usage errors -
+ the first being when a task incorrectly attempts to exit its implementing
+ function and the second being when a non interrupt safe API function is
+ called from an interrupt.
+ + Update all Cortex-A9 ports to remove obsolete mode switches prior to
+ restoring a task context.
+ + configUSE_PORT_OPTIMISED_TASK_SELECTION now defaults to 1 instead of 0.
+ + Update all Cortex-M3/4F ports to trap a non interrupt safe API function
+ being called from an interrupt handler.
+ + Simplify the alignment checks in heap_4.c.
+ + Update the MSVC Windows simulator demo to use heap_5.c in place of
+ heap_4.c to ensure end users have an example to refer to.
+ + Updated standard demo test code to test the new priority inheritance
+ algorithms.
+ + Updated the standard demo tasks to make use of stdint and the FreeRTOS
+ specific typedefs that were introduced in FreeRTOS V8.0.0.
+ + Introduce the pdMS_TO_TICKS() macro as a more user friendly and intuitive
+ alternative to pdTICKS_PER_MS - both of which can be used to convert a
+ time specified in milliseconds to a time specified in RTOS ticks.
+ + Fix a bug in the Tasking compiler's Cortex-M port that resulted in an
+ incorrect value being written to the basepri register. This only effects
+ users of the Tasking compiler.
+ + Update the Zynq demo to use version 2014.2 of the SDK and add in an lwIP
+ example that demonstrates lwIP being used with both its raw and sockets
+ interfaces.
+ + Updated the CCS Cortex-R4 port to enable it to be built with the latest
+ CCS compiler.
+
+ New ports and demo applications:
+
+ + Two Renesas RX64M ports (RXv2 core) and demos introduced, one for the GCC
+ compiler and one for the Renesas compiler. Both demos use e2 studio.
+ + Generic IAR Cortex-A5 port (without any reliance on a GIC) introduced.
+ The new port is demonstrated on an Atmel SAMA5D3 XPlained board.
+
+ FreeRTOS+ component updates:
+
+ + Update CyaSSL to the latest version.
+ + Updated the FreeRTOS+ components supplied directly by Real Time Engineers
+ Ltd. to make use of stdint and the FreeRTOS specific typedefs that were
+ introduced in FreeRTOS V8.0.0.
+ + Rework and simplify the FreeRTOS+FAT SL RAM disk driver.
+
+ Miscellaneous updates and maintenance:
+
+ + Update the IAR and DS-5/ARM RZ demos to target the official RZ RSK
+ hardware in place of the previously targeted Renesas internal (not
+ publicly available) hardware.
+ + Various other maintenance tasks.
+
+
+Changes between V8.0.0 and V8.0.1 released 2nd May 2014
+
+ + Minor fixes to the event group functionality that was released in V8.0.0.
+ The 'clear bits from ISR' functionality is now implemented using a
+ deferred interrupt callback instead of a function, and the 'wait bits' and
+ 'task sync' functions now correctly clear internal control bits before
+ returning a value in every possible path through the respective functions.
+ + Ensure the updating of internal control data is protected by a critical
+ section after a task is deleted or suspended.
+ + Minor fixes to FreeRTOS+FAT SL - namely seeking beyond the end of a file
+ when the offset was not a multiple of the sector size.
+ + Ensure Cortex-A9 system registers are only ever accessed as 32-bit values,
+ even when only the lest significant byte of the register is implemented.
+
+ Other updates:
+
+ + Updated the XMC4200 IAR project so it links with version 7.x of the IAR
+ tools.
+ + Add RL78L1C demo.
+ + Add pcTimerGetName() API function.
+ + Call _reclaim_reent() when a task is deleted if configUSE_NEWLIB_REENTRANT
+ is defined.
+
+Changes between V7.6.0 and V8.0.0 released 19th Feb 2014
+
+ https://www.FreeRTOS.org/upgrading-to-FreeRTOS-V8.html
+
+ FreeRTOS V8.x.x is a drop-in compatible replacement for FreeRTOS V7.x.x,
+ although a change to the type used to reference character strings may result
+ in application code generating a few (easily clearable) compiler warnings
+ after the upgrade, and an updated typedef naming convention means use of the
+ old typedef names is now discouraged.
+ See https://www.FreeRTOS.org/upgrading-to-FreeRTOS-V8.html for full
+ information.
+
+ New features and functionality:
+
+ + Event groups - see https://www.FreeRTOS.org/FreeRTOS-Event-Groups.html
+ + Centralised deferred interrupt processing - see
+ https://www.FreeRTOS.org/xTimerPendFunctionCallFromISR.html
+
+ Other updates:
+
+ + Previously, when a task left the Blocked state, a context switch was
+ performed if the priority of the unblocked task was greater than or equal
+ to the priority of the Running task. Now a context switch is only
+ performed if the priority of the unblocked task is greater than the
+ priority of the Running task.
+ + New low power tickless demonstration project that targets the ST STM32L
+ microcontroller - see
+ https://www.FreeRTOS.org/STM32L-discovery-low-power-tickless-RTOS-demo.html
+ + Add xPortGetMinimumEverFreeHeapSize() to heap_4.c.
+ + Small change to the tickless low power implementation on the SAM4L to
+ ensure the alarm value (compare match value) cannot be set to zero when a
+ tickless period is exited due to an interrupt originating from a source
+ other than the RTOS tick.
+ + Update the GCC/Eclipse Win32 simulator demo to make better use of Eclipse
+ resource filters and match the functionality of the MSVC equivalent.
+ + xTaskIsTaskSuspended() is no longer a public function. Use
+ eTaskGetState() in its place.
+ + Improved trace macros, including tracing of heap usage.
+ + Remove one level of indirection when accepting interrupts on the PIC32MZ.
+ + Add Cortex-A9 GCC port layer.
+ + Add Xilinx Zynq demo application.
+
+
+Changes between V7.5.3 and V7.6.0 released 18th November 2013
+
+ V7.6.0 changes some behaviour when the co-operative scheduler is used (when
+ configUSE_PREEMPTION is set to 0). It is important to note that the
+ behaviour of the pre-emptive scheduler is unchanged - the following
+ description only applies when configUSE_PREEMPTION is set to 0:
+
+ WHEN configUSE_PREEMPTION IS SET TO 0 (which is in a small minority of
+ cases) a context switch will now only occur when a task places itself into
+ the Blocked state, or explicitly calls taskYIELD(). This differs from
+ previous versions, where a context switch would also occur when implicitly
+ moving a higher priority task out of the Blocked state. For example,
+ previously, WHEN PREEMPTION WAS TURNED OFF, if task A unblocks task B by
+ writing to a queue, then the scheduler would switch to the higher priority
+ task. Now, WHEN PREEMPTION IS TURNED OFF, if task A unblocks task B by
+ writing to a queue, task B will not start running until task A enters the
+ Blocked state or task A calls taskYIELD(). [If configUSE_PREEMPTION is not
+ set to 0, so the normal pre-emptive scheduler is being used, then task B
+ will start running immediately that it is moved out of the Blocked state].
+
+ Other changes:
+
+ + Added a port layer and a demo project for the new PIC32MZ architecture.
+ + Update the PIC32MX port layer to re-introduce some ehb instructions that
+ were previously removed, add the ability to catch interrupt stack
+ overflows (previously only task stack overflows were trapped), and also
+ add the ability to catch an application task incorrectly attempting to
+ return from its implementing function.
+ + Make dramatic improvements to the performance of the Win32 simulator port
+ layer.
+ + Ensure tasks that are blocked indefinitely report their state as Blocked
+ instead of Suspended.
+ + Slight improvement to the Cortex-M4F port layers where previously one
+ register was inadvertently being saved twice.
+ + Introduce the xSemaphoreCreateBinary() API function to ensure consistency
+ in the semantics of how each semaphore type is created. It is no longer
+ recommended to use vSemaphoreCreateBinary() (the version prefixed with a
+ 'v'), although it will remain in the code for backward compatibility.
+ + Update the Cortex-M0 port layers to allow the scheduler to be started
+ without using the SVC handler.
+ + Added a build configuration to the PIC32MX MPLAB X demo project that
+ targets the PIC32 USB II starter kit. Previously all the build
+ configurations required the Explorer 16 hardware.
+ + Some of the standard demo tasks have been updated to ensure they execute
+ correctly with the updated co-operative scheduling behaviour.
+ + Added comprehensive demo for the Atmel SAM4E, including use of
+ FreeRTOS+UDP, FreeRTOS+FAT SL and FreeRTOS+CLI.
+
+ FreeRTOS+ Changes:
+
+ + Minor maintenance on FreeRTOS+UDP.
+
+Changes between V7.5.2 and V7.5.3 released October 14 2013
+
+ Kernel changes:
+
+ + Prior to V7.5.x yields requested from the tick hook would occur in the
+ same tick interrupt - revert to that original behaviour.
+ + New API function uxQueueSpacesAvailable().
+ + Introduced the prvTaskExitError() function to Cortex-M0, Cortex-M3/4
+ and Cortex-M4F ports. prvTaskExitError() is used to trap tasks that
+ attempt to return from their implementing functions (tasks should call
+ vTaskDelete( NULL ); if they want to exit).
+ + The Cortex-M0 version of portSET_INTERRUPT_MASK_FROM_ISR and
+ portCLEAR_INTERRUPT_MASK_FROM_ISR are now fully nestable.
+ + Improved behaviour and robustness of the default Cortex-M tickless idle
+ behaviour.
+ + Add workaround for silicon errata PMU_CM001 in Infineon XMC4000 devices to
+ all Cortex-M4F ports.
+ + Add Cortex-M0 port for Keil.
+ + Updated Cortus port.
+ + Ensure _impure_ptr is initialised before the scheduler is started.
+ Previously it was not set until the first context switch.
+
+ FreeRTOS+ changes:
+
+ + Update FreeRTOS+UDP to V1.0.1 - including direct integration of the
+ FreeRTOS+Nabto task, improvements to the DHCP behaviour, and a correction
+ to the test that prevents the network event hook being called on the first
+ network down event. The FreeRTOS+UDP change history is maintained
+ separately.
+ + Correct the __NVIC_PRIO_BITS setting in the LPC18xx.h header files
+ provided in the NXP CMSIS library, then update the interrupts used by the
+ LPC18xx demos accordingly.
+ + Replace double quotes (") with single quotes (') in FreeRTOS+CLI help
+ strings to ensure the strings can be used with the JSON descriptions used
+ in the FreeRTOS+Nabto demos.
+
+ Demo and miscellaneous changes:
+
+ + Added demo for the Atmel SAMD20 Cortex-M0+. The demo includes
+ FreeRTOS+CLI
+ + Added a demo for the Infineon Cortex-M0 that can be built with the IAR
+ Keil and GCC tools.
+ + Updated the Infineon XMC4000 demos for IAR, Keil, GCC and Tasking tools,
+ with additional build configurations to directly support the XMC4200 and
+ XMC4400 devices, in addition to the previously supported XMC4500.
+ + Updated the demo application.
+ + Added additional trace macros traceMALLOC and traceFREE to track heap
+ usage.
+
+Changes between V7.5.0 and V7.5.2 released July 24 2013
+
+ V7.5.2 makes the new Cortex-M vPortCheckInterruptPriority() function
+ compatible with the STM32 standard peripheral driver library, and adds
+ an extra critical section to the default low power tickless mode
+ implementation. Only users of the STM32 peripheral library or the default
+ tickless implementation need update from version 7.5.0.
+
+Changes between V7.4.2 and V7.5.0 released July 19 2013
+
+ V7.5.0 is a major upgrade that includes multiple scheduling and efficiency
+ improvements, and some new API functions.
+
+ Compatibility information for FreeRTOS users:
+ FreeRTOS V7.5.0 is backward compatible with FreeRTOS V7.4.0 with one
+ exception; the vTaskList() and vTaskGetRunTimeStats() functions are now
+ considered legacy, having been replaced by the single uxTaskGetSystemState()
+ function. configUSE_STATS_FORMATTING_FUNCTIONS must be set to 1 in
+ FreeRTOSConfig.h for vTaskList() and vTaskGetRunTimeStats() to be
+ available.
+
+ Compatibility information for FreeRTOS port writers:
+ vTaskIncrementTick() is now called xTaskIncrementTick() (because it now
+ returns a value).
+
+ Headline changes:
+
+ + Multiple scheduling and efficiency improvements.
+ + Core kernel files now pass PC-Lint V8 static checking without outputting
+ any warnings (information on the test conditions will follow).
+
+ New API functions:
+
+ + uxTaskGetSystemState() https://www.FreeRTOS.org/uxTaskGetSystemState.html
+ + xQueueOverwrite() https://www.FreeRTOS.org/xQueueOverwrite.html
+ + xQueueOverwriteFromISR()
+ + xQueuePeekFromISR()
+
+ The following ports and demos, which were previously available separately,
+ are now incorporated into the main FreeRTOS zip file download:
+
+ + ARM Cortex-A9 IAR
+ + ARM Cortex-A9 ARM compiler
+ + Renesas RZ
+ + Microsemi SmartFusion2
+
+ New FreeRTOSConfig.h settings
+ http://shop.freertos.org/FreeRTOS_API_and_Configuration_Reference_s/1822.htm
+
+ + configUSE_TIME_SLICING
+ + configUSE_NEWLIB_REENTRANT
+ + configUSE_STATS_FORMATTING_FUNCTIONS
+ + configINCLUDE_APPLICATION_DEFINED_PRIVILEGED_FUNCTIONS
+
+ Other changes:
+
+ + (MPU port only) The configINCLUDE_APPLICATION_DEFINED_PRIVILEGED_FUNCTIONS
+ options provides a mechanism that allows application writers to execute
+ certain functions in privileged mode even when a task is running in user
+ mode.
+ + Ports that support interrupt nesting now include a configASSERT() that
+ will trigger if an interrupt safe FreeRTOS function is called from an
+ interrupt that has a priority designated as above the maximum system/API
+ call interrupt priority.
+ + The included FreeRTOS+Trace recorder code has been updated to the latest
+ version, and the demo applications that use the trace recorder code have
+ been updated accordingly.
+ + The FreeRTOS Windows Simulator (MSVC version only) has been updated to
+ include a new basic 'blinky' build option in addition to the original
+ comprehensive build option.
+ + Improve RAM usage efficiency of heap_4.c and heap_2.c.
+ + Prevent heap_4.c from attempting to free memory blocks that were not
+ allocated by heap_4.c, or have already been freed.
+ + As FreeRTOS now comes with FreeRTOS+FAT SL (donated by HCC) the Chan FATfs
+ files have been removed from FreeRTOS/Demo/Common.
+ + Fix build error when R4 port is build in co-operative mode.
+ + Multiple port and demo application maintenance activities.
+
+Changes between V7.4.1 and V7.4.2 released May 1 2013
+
+ NOTE: There are no changes in the FreeRTOS kernel between V7.4.1 and V7.4.2
+
+ + Added FreeRTOS+FAT SL source code and demo project. The demo project
+ runs in the FreeRTOS Windows simulator for easy and hardware independent
+ experimentation and evaluation. See https://www.FreeRTOS.org/fat_sl
+
+Changes between V7.4.0 and V7.4.1 released April 18 2013
+
+ + To ensure strict conformance with the spec and ensure compatibility with
+ future chips data and instruction barrier instructions have been added to
+ the yield macros of Cortex-M and Cortex-R port layers. For efficiency
+ the Cortex-M port layer "yield" and "yield" from ISR are now implemented
+ separately as the barrier instructions are not required in the ISR case.
+ + Added FreeRTOS+UDP into main download.
+ + Reorganised the FreeRTOS+ directory so it now matches the FreeRTOS
+ directory with Source and Demo subdirectories.
+ + Implemented the Berkeley sockets select() function in FreeRTOS+UDP.
+ + Changed (unsigned) casting in calls to standard library functions with
+ (size_t) casting.
+ + Added the Atmel SAM4L and Renesas RX100 demos that demonstrates the
+ tickless (tick suppression) low power FreeRTOS features.
+ + Add a new RL78 IAR demo that targets numerous new RL78 chips and
+ evaluation boards.
+ + Adjusted stack alignment on RX200 ports to ensure an assert was not
+ falsely triggered when configASSERT() is defined.
+ + Updated the Cortex_M4F_Infineon_XMC4500_IAR demo to build with the latest
+ version of EWARM.
+ + Corrected header comments in the het.c and het.h files (RM48/TMS570 demo).
+
+
+Changes between V7.3.0 and V7.4.0 released February 20 2013
+
+ + New feature: Queue sets. See:
+ https://www.FreeRTOS.org/Pend-on-multiple-rtos-objects.html
+ + Overhauled the default tickless idle mode implementation provided with the
+ ARM Cortex-M3 port layers.
+ + Enhanced tickless support in the core kernel code with the introduction of
+ the configEXPECTED_IDLE_TIME_BEFORE_SLEEP macro and the
+ eTaskConfirmSleepModeStatus() function.
+ + Added the QueueSet.c common demo/test file. Several demo applications
+ have been updated to use the new demo/test tasks.
+ + Removed reliance on the PLIB libraries from the MPLAB PIC32 port layer and
+ demo applications.
+ + Added the FreeRTOS+Trace recorder code to the MSVC Win32 demo.
+ + Renamed eTaskStateGet() to eTaskGetState() for consistency, and added a
+ pre-processor macro for backward compatibility with the previous name.
+ + Updated functions implemented in the core queue.c source file to allow
+ queue.h to be included from the .c file directly (this prevents compiler
+ warnings that were generated by some compilers).
+ + Updated the CCS Cortex-R4 port layer to replace the CLZ assembler function
+ with the CLZ compiler intrinsic that is provided by the latest versions of
+ the CCS ARM compiler.
+ + Updated all heap_x.c implementations to replace the structure that was
+ used to ensure the start of the heap was aligned with a more portable
+ direct C code implementation.
+ + Added support for PIC24 devices that include EDS.
+ + Minor optimisations to the PIC32 port layer.
+ + Minor changes to tasks.c that allow the state viewer plug-ins to display
+ additional information.
+ + Bug fix: Update prvProcessReceivedCommands() in timers.c to remove an
+ issue that could occur if the priority of the timer daemon task was set
+ below the priority of tasks that used timer services.
+ + Update the FreeRTOS+Trace recorder code to the latest version.
+
+Changes between V7.2.0 and V7.3.0 released October 31 2012
+
+ + Added ability to override the default scheduler task selection mechanism
+ with implementations that make use of architecture specific instructions.
+ + Added ability to suppress tick interrupts during idle time, and in so
+ doing, provide the ability to make use of architecture specific low power
+ functionality.
+ + Added the portSUPPRESS_TICKS_AND_SLEEP() macro and vTaskStepTick() helper
+ function.
+ + Added the configSYSTICK_CLOCK_HZ configuration constant.
+ + Reworked the Cortex-M3 and Cortex-M4F port layers for GCC, Keil and IAR to
+ directly support basic power saving functionality.
+ + Added hooks to allow basic power saving to be augmented in the application
+ by making use of chip specific functionality.
+ + Minor change to allow mutex type semaphores to be used from interrupts
+ (which would not be a normal usage model for a mutex).
+ + Change the behaviour of the interrupt safe interrupt mask save and restore
+ macros in the Cortex-M ports. The save macro now returns the previous
+ mask value. The restore macro now uses the previous mask value. These
+ changes are not necessary for the kernel's own implementation, and are
+ made purely because the macros were being used by application writers.
+ + Added eTaskStateGet() API function.
+ + Added port specific optimisations to the PIC32 port layer, and updated the
+ PIC32 demo applications to make use of this new feature.
+ + Added port specific optimisations to the Win32 simulator port.
+ + Added new ports and demo applications for the TI Hercules RM48 and TMS570
+ safety microcontrollers.
+ + Added SAM3 demos targeting the ATSAM3S-EK2 and ATSAM3X-EK evaluation
+ boards.
+ + Updated the PIC32 MPLAB X project to manually set the compiler include
+ paths instead of using the IDE entry box following reports that the
+ include paths were somehow being deleted.
+ + Improved character handling in FreeRTOS+CLI.
+
+Changes between V7.1.1 and V7.2.0 released 14 August 2012
+
+ FreeRTOS V7.2.0 is backward compatible with FreeRTOS V7.1.2.
+
+ + Added a FreeRTOS+ sub-directory. The directory contains some FreeRTOS+
+ source code, and example projects that use the FreeRTOS Win32 simulator.
+ + Added a new example heap allocation implementation (heap_4.c) that
+ includes memory block coalescence.
+ + Added a demo that targets the Atmel SAM4S Cortex-M4 based microcontroller.
+ The demo is preconfigured to build using the free Atmel Studio 6 IDE and
+ GCC compiler.
+ + Added xSemaphoreTakeFromISR() implementation.
+ + The last parameter in ISR safe FreeRTOS queue and semaphore functions
+ (xHigherPriorityTaskWoken) is now optional and can be set to NULL if it
+ is not required.
+ + Update the IAR and MSP430X ports to clear all lower power mode bits before
+ exiting the tick interrupt [bug fix].
+ + Allow xQueueReset() to be used, even when the queues event lists are not
+ empty.
+ + Added a vQueueDelete() handler for the FreeRTOS MPU port (this was
+ previously missing).
+ + Updated the vPortSVCHandler() functions in the FreeRTOS MPU port layer to
+ ensure it compiles with the latest ARM GCC compilers from Linaro.
+ + Updated the prvReadGP() function in the NIOS II port to ensure the compiler
+ can choose any register for the functions parameter (required at high
+ compiler optimisation levels).
+ + Add #error macros into the Keil and IAR Cortex-M ports to ensure they
+ cannot be built if the user has set configMAX_SYSCALL_INTERRUPT_PRIORITY
+ to 0.
+ + Added comments in the FreeRTOSConfig.h files associated with Cortex-M3 and
+ Cortex-M4 demos stating that the configMAX_SYSCALL_INTERRUPT_PRIORITY
+ parameter must not be set to 0.
+ + Introduce new INCLUDE_xQueueGetMutexHolder configuration constant
+ (defaulted to 0).
+ + Added two new list handling macros - for internal use only in upcoming new
+ products.
+ + Removed all mention of the legacy vTaskStartTrace and ulTaskEndTrace
+ macros. FreeRTOS+Trace supersedes the legacy trace.
+ + Added a configASSERT() into the vPortFree() function in heap_1.c as it is
+ invalid for the function to be called.
+ + Made the xRxLock and xTxLock members of the queue structure volatile.
+ This is probably not necessary, and is included as a precautionary
+ measure.
+ + Modify the assert() that checks to see if the priority passed into an
+ xTaskCreate() function is within valid bounds to permit the assert to be
+ used in the FreeRTOS MPU port.
+ + The software timer service (daemon) task is now created in a way that
+ to ensure compatibility with FreeRTOS MPU.
+
+Changes between V7.1.0 and V7.1.1 released May 1 2012
+
+ New ports:
+
+ The following ports are brand new:
+ + Cortex-M3 Tasking
+
+ The following ports have been available as separate downloads for a number
+ of months, but are now included in the main FreeRTOS download.
+ + Cortex-M0 IAR
+ + Cortex-M0 GCC
+ + Cortex-M4F GCC (with full floating point support)
+
+
+ New demos:
+
+ The following demos are brand new:
+ + Renesas RX63N RDK (Renesas compiler)
+
+ The following demos have been available as separate downloads for a number
+ of months, but are now included in the main FreeRTOS download.
+ + NXP LPC1114 GCC/LPCXpresso
+ + ST STM32F0518 IAR
+ + Infineon XMC4500 GCC/Atollic
+ + Infineon XMC4500 IAR
+ + Infineon XMC4500 Keil
+ + Infineon XMC4500 Tasking
+
+
+ Kernel miscellaneous / maintenance:
+
+ + Introduced the portSETUP_TCB() macro to remove the requirement for the
+ Windows simulator to use the traceTASK_CREATE() macro, leaving the trace
+ macro available for use by FreeRTOS+Trace (https://www.FreeRTOS.org/trace).
+ + Added a new trace macro, traceMOVE_TASK_TO_READY_STATE(), to allow future
+ FreeRTOS+Trace versions to provide even more information to users.
+ + Updated the FreeRTOS MPU port to be correct for changes that were
+ introduced in FreeRTOS V7.1.0.
+ + Introduced the xQueueReset() API function.
+ + Introduced the xSemaphoreGetMutexHolder() API function.
+ + Tidy up various port implementations to add the static key word where
+ appropriate, and remove obsolete code.
+ + Slight change to the initial stack frame given to the RX600 ports to allow
+ them to be used in the Eclipse based E2Studio IDE without confusing GDB.
+ + Correct the alignment given to the initial stack of Cortex-M4F tasks.
+ + Added a NOP following each DINT instruction on MSP430 devices for strict
+ conformance with the instructions on using DINT.
+ + Changed the implementation of thread deletes in the Win32 port to prevent
+ the port making use of the traceTASK_DELETE() trace macros - leaving this
+ macro free for use by FreeRTOS+Trace.
+ + Made some benign changes to the RX600 Renesas compiler port layer to
+ ensure the code can be built to a library without essential code being
+ removed by the linker.
+ + Reverted the change in the name of the uxTaskNumber variable made in
+ V7.1.0 as it broke the IAR plug-in.
+
+
+ Demo miscellaneous / maintenance:
+
+ + The command interpreter has now been formally released as FreeRTOS+CLI,
+ and been moved out of the main FreeRTOS download, to instead be available
+ from the FreeRTOS+ Ecosystem site https://www.FreeRTOS.org/plus.
+ + flash_timer.c/h has been added to the list of standard demo tasks. This
+ performs the same functionality as the flash.c tasks, but using software
+ timers in place of tasks.
+ + Upgraded the PIC32 demo as follows: Changes to how the library functions
+ are called necessitated by the new compiler version, addition of MPLAB X
+ project with PIC32MX360, PIC32MX460 and PIC32MX795 configurations,
+ addition of simply blinky demo, updated FreeRTOSConfig.h to include more
+ parameters, addition of hook function stubs.
+ + The MSP430X IAR and CCS demos have been updated to ensure the power
+ settings are correct for the configured CPU frequency.
+ + Rowley CrossWorks projects have been updated to correct the "multiple
+ definition of ..." warnings introduced when the toolchain was updated.
+ + Updated various FreeRTOSConfig.h header files associated with projects
+ that build with Eclipse to include a #error statement informing the user
+ that the CreateProjectDirectoryStructure.bat batch file needs to be
+ executed before the projects can be opened.
+ + Renamed directories that included "CCS4" in their name to remove the '4'
+ and instead just be "CCS". This is because the demo was updated and
+ tested to also work with later Code Composer Studio versions.
+ + Updated the TCP/IP periodic timer frequency in numerous uIP demos to be
+ 50ms instead of 500ms.
+
+Changes between V7.0.2 and V7.1.0 released December 13 2011
+
+ New ports:
+
+ + Cortex-M4F IAR port.
+ + Cortex-M4F Keil/RVDS port.
+ + TriCore GCC port.
+
+ New demos:
+
+ + NXP LPC4350 using the Keil MDK, and demonstrated on a Hitex development
+ board.
+ + ST STM32F407 using the IAR Embedded Workbench for ARM, and demonstrated on
+ the IAR STM32F407ZG-SK starter kit.
+ + Infineon TriCore TC1782, using the GCC compiler, demonstrated on the
+ TriBoard TC1782 evaluation board.
+ + Renesas RX630, using the Renesas compiler and HEW, demonstrated on an
+ RX630 RSK (Renesas Starter Kit).
+
+ Miscellaneous / maintenance:
+
+ + Removed all calls to printf() from the K60/IAR Kinetis demo so the project
+ can execute stand alone - without being connected to the debugger.
+ + Completed the command interpreter framework. Command handlers now receive
+ the entire command string, giving them direct access to parameters.
+ Utility functions are provided to check the number of parameters, and
+ return parameter sub-strings.
+ + The previously documented fix for the bug in xTaskResumeFromISR() that
+ effected (only) ports supporting interrupt nesting has now been
+ incorporated into the main release.
+ + The portALIGNMENT_ASSERT_pxCurrentTCB() definition has been added to allow
+ specific ports to skip the second stack alignment check when a task is
+ created. This is because the second check is not appropriate for some
+ ports - including the new TriCore port where the checked pointer does not
+ actually point to a stack.
+ + The portCLEAN_UP_TCB() macro has been added to allow port specific clean
+ up when a task is deleted - again this is required by the TriCore port.
+ + Various other minor changes to ensure warning free builds on a growing
+ number of microcontroller and toolchain platforms. This includes a
+ (benign) correction to the prototype of the
+ vApplicationStackOverflowHook() definition found in lots of recent demos.
+
+ Trace system:
+
+ + The legacy trace mechanism has been completely removed - it has been
+ obsolete for the years since the trace macros were introduced. The
+ configuration constant configUSE_TRACE_FACILITY is now used to optionally
+ include additional queue and task information. The additional information
+ is intended to make the trace mechanism more generic, and allow the trace
+ output to provide more information. When configUSE_TRACE_FACILITY is set
+ to 1:
+ - the queue structure includes an additional member to hold the queue
+ type, which can be base, mutex, counting semaphore, binary semaphore
+ or recursive mutex.
+ - the queue structure includes an additional member to hold a queue
+ number. A trace tool can set and query the queue number for its own
+ purposes. The kernel does not use the queue number itself.
+ - the TCB structure includes an additional member to hold a task number
+ number. A trace tool can set and query the task number for its own
+ purposes. The kernel does not use the task number itself.
+ + Queues and all types of semaphores are now automatically allocated their
+ type as they are created.
+ + Added two new trace macros - traceTASK_PRIORITY_INHERIT() and
+ traskTASK_PRIORITY_DISINHERIT().
+ + Updated the traceQUEUE_CREATE_FAILED() macro to take a parameter that
+ indicates the type of queue, mutex, or semaphore that failed to be
+ created.
+ + The position from which traceCREATE_MUTEX() is called has been moved from
+ after the call to xQueueGenericSend() [within the same function] to before
+ the call. This ensures the trace events occur in the correct order.
+ + The value passed into tracePRIORITY_SET() has been corrected for the case
+ where vTaskPrioritySet() is called with a null parameter.
+
+Changes between V7.0.1 and V7.0.2 released September 20 2011
+
+ New ports:
+
+ + The official FreeRTOS Renesas RX200 port and demo application have been
+ incorporated into the main FreeRTOS zip file download.
+ + The official FreeRTOS Renesas RL78 port and demo application have been
+ incorporated into the main FreeRTOS zip file download.
+ + The official FreeRTOS Freescale Kinetis K60 tower demo application has
+ been incorporated into the main FreeRTOS zip file download. This includes
+ an embedded web server example.
+ + A new Microblaze V8 port layer has been created to replace the older, now
+ deprecated, port layer. The V8 port supports V8.x of the Microblaze IP,
+ including exceptions, caches, and the floating point unit. A new
+ Microblaze demo has also been added to demonstrate the new Microblaze V8
+ port layer. The demo application was created using V13.1 of the Xilinx
+ EDK, and includes a basic embedded web server that uses lwIP V1.4.0.
+ + The official FreeRTOS Fujitsu FM3 MB9A310 demo application has been
+ incorporated into the main FreeRTOS zip file download. Projects are
+ provided for both the IAR and Keil toolchains.
+
+
+ API additions:
+
+ + xTaskGetIdleTaskHandle() has been added.
+ + xTaskGetTimerDaemonTaskHandle() has been added.
+ + pcTaskGetTaskName() has been added.
+ + vSemaphoreDelete() macro has been added to make it obvious how to delete
+ a semaphore. In previous versions vQueueDelete() had to be used.
+ + vTaskCleanUpResources() has been removed. It has been obsolete for a
+ while.
+ + portPOINTER_SIZE_TYPE has been introduced to prevent compiler warnings
+ being generated when the size of a pointer does not match the size of
+ the stack type. This will (has already) be used in new ports, but will
+ not be retrofitted to existing ports until the existing port itself is
+ updated.
+
+ Other updates and news:
+
+ + The core files have all been modified to tighten the coding standard even
+ further. These are style, not functional changes.
+ + All ARM7 port layers have been slightly modified to prevent erroneous
+ assert() failures when tasks are created and configASSERT() is defined.
+ + All ARM IAR projects have been updated to build with the latest V6.2.x
+ versions of the IAR Embedded Workbench for ARM tools (EWARM). This was
+ necessary due to a change in the way EWARM uses the CMSIS libraries.
+ + The PIC32 port layer has been updated in preparation for V2 of the C32
+ compiler.
+ + The old Virtex-4 Microblaze demo has been marked as deprecated. Please
+ use the brand new Spartan-6 port and demo in its place.
+ + The bones of a new generic command interpreter is located in
+ FreeRTOS/Demo/Common/Utils/CommandInterpreter.c. This is still a work in
+ progress, and not documented. It is however already in use. It will be
+ documented in full when the projects that are already using it are
+ completed.
+ + A couple of new standard demos have been included. First, a version of
+ flop.c called sp_flop.c. This is similar to flop.c, but uses single
+ precision floats in place of double precision doubles. This allows the
+ for testing ports to processors that have only single precision floating
+ point units, and revert to using emulated calculations whenever a double
+ is used. Second, comtest_strings.c has been included to allow the test
+ of UART drivers when an entire string is transmitted at once. The
+ previous comtest.c only used single character transmission and reception.
+ + lwIP V1.4.0 is now included in the FreeRTOS/Demo/Common directory, and
+ used by a couple of new demos.
+
+Changes between V7.0.0 and V7.0.1 released May 13 2011
+
+ + Added a Fujitsu FM3 demo application for both the IAR and Keil tool
+ chains.
+ + Added a SmartFusion demo application for all of the IAR, Keil and
+ SoftConsole (GCC/Eclipse) tool chains.
+ + Updated the RX600 port and demo applications to take into account the
+ different semantics required when using the latest (V1.0.2.0) version of
+ the Renesas compiler.
+ + Modified the RX600 Ethernet driver slightly to make it more robust under
+ heavy load, and updated the uIP handling task to make use of the FreeRTOS
+ software timers.
+ + Slightly changed the PIC32 port layer to move an ehb instruction in line
+ with the recommendations of the MIPS core manual, and ensure 8 byte stack
+ alignment is truly always obtained.
+ + Changed the behaviour when tasks are suspended before the scheduler has
+ been started. Before, there needed to be at least one task that was not
+ in the suspended state. This is no longer the case.
+
+Changes between V6.1.1 and V7.0.0 released April 8 2011
+
+ FreeRTOS V7.0.0 is backward compatible with FreeRTOS V6.x.x
+
+ Main changes:
+
+ + Introduced a new software timer implementation.
+ + Introduced a new common demo application file to exercise the new timer
+ implementation.
+ + Updated the Win32/MSVC simulator project to include the new software timer
+ demo tasks and software timer tick hook test. Much simpler software timer
+ demonstrations are included in the demo projects for both of the new ports
+ (MSP430X with CCS4 and STM32 with TrueStudio).
+ + Various enhancements to the kernel implementation in tasks.c. These are
+ transparent to users and do not effect the pre-existing API.
+ + Added calls to configASSERT() within the kernel code. configASSERT() is
+ functionally equivalent to the standard C assert() macro, but does not
+ rely on the compiler providing assert.h.
+
+ Other changes:
+
+ + Updated the MSP430X IAR port and demo project to include support for the
+ medium memory model.
+ + Added a demo project for the MSP430X that targets the MSP430X Discovery
+ board and uses the Code Composer Studio 4 tools. This demo includes use
+ of the new software timer implementation.
+ + Added an STM32F100RB demo project that targets the STM32 Discovery Board
+ and uses the TrueStudio Eclipse based IDE from Atollic.
+ + Removed some compiler warnings from the PSoC demo application.
+ + Updated the PIC32 port layer to ensure the
+ configMAX_SYSCALL_INTERRUPT_PRIORITY constant works as expected no matter
+ what its value is (within the valid range set by the microcontroller
+ kernel).
+ + Updated the PIC24, dsPIC and PIC32 projects so they work with the latest
+ MPLAB compiler versions from Microchip.
+ + Various cosmetic changes to prepare for a standards compliance statement
+ that will be published after the software release.
+
+
+Changes between V6.1.0 and V6.1.1 released January 14 2011
+
+ + Added two new Windows simulator ports. One uses the free Microsoft Visual
+ Studio 2010 express edition, and the other the free MingW/Eclipse
+ environment. Demo projects are provided for both.
+ + Added three demo projects for the PSoC 5 (CYAC5588). These are for the
+ GCC, Keil, and RVDS build tools, and all use the PSoC Creator IDE.
+ + Added a demo for the low power STM32L152 microcontroller using the IAR
+ Embedded Workbench.
+ + Added a new port for the MSP430X core using the IAR Embedded Workbench.
+ + Updated all the RX62N demo projects that target the Renesas Demonstration
+ Kit (RDK) to take into account the revered LED wiring on later hardware
+ revisions, and the new J-Link debug interface DLL.
+ + Updated all the RX62N demo projects so the IO page served by the example
+ embedded web server works with all web browsers.
+ + Updated the Red Suite projects to work with the up coming Red Suite
+ release, and to use a more recent version of the CMSIS libraries.
+ + Added the traceTAKE_MUTEX_RECURSIVE_FAILED() trace macro.
+ + Removed the (pointless) parameter from the traceTASK_CREATE_FAILED()
+ trace macro.
+ + Introduced the portALT_GET_RUN_TIME_COUNTER_VALUE() macro to compliment
+ the already existing portGET_RUN_TIME_COUNTER_VALUE(). This allows for
+ more flexibility in how the time base for the run time statistics feature
+ can be implemented.
+ + Added a "cpsie i" instruction before the "svc 0" instruction used to start
+ the scheduler in each of the Cortex M3 ports. This is to ensure that
+ interrupts are globally enabled prior to the "svc 0" instruction being
+ executed in cases where interrupts are left disabled by the C start up
+ code.
+ + Slight optimisation in the run time stats calculation.
+
+Changes between V6.0.5 and V6.1.0 released October 6 2010
+
+ + Added xTaskGetTickCountFromISR() function.
+ + Modified vTaskSuspend() to allow tasks that have just been created to be
+ immediately suspended even when the kernel has not been started. This
+ allows them to effectively start in the Suspended state - a feature that
+ has been asked for on numerous occasions to assist with initialisation
+ procedures.
+ + Added ports for the Renesas RX62N using IAR, GCC and Renesas tool suites.
+ + Added a STM32F103 demo application that uses the Rowley tools.
+ + Under specific conditions xFreeBytesRemaining within heap_2.c could end up
+ with an incorrect value. This has been fixed.
+ + xTaskCreateGeneric() has a parameter that can be used to pass the handle
+ of the task just created out to the calling task. The assignment to this
+ parameter has been moved to ensure it is assigned prior to the newly
+ created having any possibility of executing. This takes into account the
+ case where the assignment is made to a global variable that is accessed by
+ the newly created task.
+ + Fixed some build time compiler warnings in various FreeTCPIP (based on
+ uIP) files.
+ + Fixed some build time compiler warnings in Demo/Common/Minimal/IntQueue.c.
+
+Changes between V6.0.4 and V6.0.5 released May 17 2010
+
+ + Added port and demo application for the Cortus APS3 processor.
+
+Changes between V6.0.3 and V6.0.4 released March 14 2010
+
+ + All the contributed files that were located in the Demo/Unsupported_Demos
+ directory have been removed. These files are instead now available in the
+ new Community Contributions section of the FreeRTOS website. See
+ https://www.FreeRTOS.org/RTOS-contributed-ports.html
+ + The project file located in the Demo/CORTEX_STM32F107_GCC_Rowley directory
+ has been upgraded to use V2.x of the Rowley Crossworks STM32 support
+ package.
+ + An initial Energy Micro EFM32 demo has been included. This will be
+ updated over the coming months to make better use of the low power modes
+ the EFM32 provides.
+
+Changes between V6.0.2 and V6.0.3 released February 26 2010
+
+ + SuperH SH7216 (SH2A-FPU) port and demo application added.
+ + Slight modification made to the default implementation of
+ pvPortMallocAligned() and vPortFreeAligned() macros so by default they
+ just call pvPortMalloc() and vPortFree(). The macros are only needed to
+ be defined when a memory protection unit (MPU) is being used - and then
+ only depending on other configuration settings.
+
+Changes between V6.0.1 and V6.0.2 released January 9th 2010
+
+ + Changed all GCC ARM 7 ports to use 0 as the SWI instruction parameter.
+ Previously the parameter was blank and therefore only an implicit 0 but
+ newer GCC releases do not permit this.
+ + Updated IAR SAM7S and SAM7X ports to work with IAR V5.40.
+ + Changed the stack alignment requirement for PIC32 from 4 bytes to 8 bytes.
+ + Updated prvListTaskWithinSingleList() is it works on processors where the
+ stack grows up from low memory.
+ + Corrected some comments.
+ + Updated the startup file for the RVDS LPC21xx demo.
+
+Changes between V6.0.0 and V6.0.1 released November 15th 2009
+
+ + Altered pxPortInitialiseStack() for all Cortex-M3 ports to ensure the
+ stack pointer is where the compiler expects it to be when a task first
+ starts executing.
+
+ The following minor changes only effect the Cortex-M3 MPU port:
+
+ + portRESET_PRIVILEGE() assembly macro updated to include a clobber list.
+ + Added prototypes for all the privileged function wrappers to ensure no
+ compile time warnings are generated no matter what the warning level
+ setting.
+ + Corrected the name of portSVC_prvRaisePrivilege to
+ portSVC_RAISE_PRIVILEGE.
+ + Added conditional compilation into xTaskGenericCreate() to prevent some
+ compilers issuing warnings when portPRIVILEGE_BIT is defined as zero.
+
+
+Changes between V5.4.2 and V6.0.0 released October 16th 2009
+
+ FreeRTOS V6 is backward compatible with FreeRTOS V5.x.
+
+ Main changes:
+
+ + FreeRTOS V6 is the first version to include memory protection unit (MPU)
+ support. Two ports now exist for the Cortex M3, the standard FreeRTOS
+ which does not include MPU support, and FreeRTOS-MPU which does.
+ + xTaskCreateRestricted() and vTaskAllocateMPURegions() API functions added
+ in support of FreeRTOS-MPU.
+ + Wording for the GPL exception has been (hopefully) clarified. Also the
+ license.txt file included in the download has been fixed (the previous
+ version contained some corruption).
+
+ Other changes:
+
+ + New API function xPortGetFreeHeapSize() added to heap_1.c and heap_2.c.
+ + ARM7 GCC demo interrupt service routines wrappers have been modified to
+ call the C portion using an __asm statement. This prevents the function
+ call being inlined at higher optimisation levels.
+ + ARM7 ports now automatically set the THUMB bit if necessary when
+ setting up the initial stack of a task - removing the need for
+ THUMB_INTERWORK to be defined. This also allows THUMB mode and ARM mode
+ tasks to be mixed more easily.
+ + All ARM7/9 ports now have portBYTE_ALIGNMENT set to 8 by default.
+ + Various demo application project files have been updated to be up to date
+ with the latest IDE versions.
+ + The linker scripts used with command line GCC demos have been updated to
+ include an eh_frame section to allow their use with the latest Yagarto
+ release. Likewise the demo makefiles have been updated to include
+ command line options to reduce or eliminate the eh_frame section all
+ together.
+ + The definition of portBYTE_ALIGNMENT_MASK has been moved out of the
+ various memory allocation files and into the common portable.h header
+ file.
+ + Removed unnecessary use of portLONG, portSHORT and portCHAR.
+ + Added LM3Sxxxx demo for Rowley CrossWorks.
+ + Posix simulator has been upgraded - see the corresponding WEB page on the
+ FreeRTOS.org site.
+
+
+Changes between V5.4.1 and V5.4.2 released August 9th 2009
+
+ + Added a new port and demo app for the Altera Nios2 soft core.
+ + Added LPC1768 demo for IAR.
+ + Added a USB CDC demo to all LPC1768 demos (Code Red, CrossWorks and IAR).
+ + Changed clock frequency of LPC1768 demos to 99MHz.
+
+Changes between V5.4.0 and V5.4.1 released July 25th 2009
+
+ + New hook function added. vApplicationMallocFailedHook() is (optionally)
+ called if pvPortMalloc() returns NULL.
+ + Additional casting added to xTaskCheckForTimeOut(). This prevents
+ problems that can arise should configUSE_16_BIT_TICKS be set to 1 on a
+ 32 bit architecture (which would probably be a mistake, anyway).
+ + Corrected the parameter passed to NVIC_SetPriority() to set the MAC
+ interrupt priority in both LPC1768 demos.
+ + Decreased the default setting of configMINIMAL_STACK_SIZE in the PIC32
+ demo application to ensure the heap space was not completely consumed
+ before the scheduler was started.
+
+Changes between V5.3.1 and V5.4.0 released July 13th 2009
+
+ + Added Virtex5 / PPC440 port and demos.
+ + Replaced the LPC1766 Red Suite demo with an LPC1768 Red Suite demo. The
+ original demo was configured to use engineering samples of the CPU. The
+ new demo has an improved Ethernet driver.
+ + Added LPC1768 Rowley demo with zero copy Ethernet driver.
+ + Reworked byte alignment code to ensure 8 byte alignment works correctly.
+ + Set configUSE_16_BIT_TICKS to 0 in the PPC405 demo projects.
+ + Changed the initial stack setup for the PPC405 to ensure the small data
+ area pointers are setup correctly.
+
+Changes between V5.3.0 and V5.3.1 released June 21st 2009
+
+ + Added ColdFire V1 MCF51CN128 port and WEB server demo.
+ + Added STM32 Connectivity Line STM32107 Cortex M3 WEB server demo.
+ + Changed the Cortex M3 port.c asm statements to __asm so it can be
+ compiled using Rowley CrossWorks V2 in its default configuration.
+ + Updated the Posix/Linux simulator contributed port.
+
+Changes between V5.2.0 and V5.3.0 released June 1st 2009
+
+ Main changes:
+
+ + Added new (optional) feature that gathers statistics on the amount of CPU
+ time used by each task.
+ + Added a new demo application for the Atmel AT91SAM3U Cortex-M3 based
+ microcontroller.
+ + Added a new demo application for the NXP LPC1766 Cortex-M3 based
+ microcontroller.
+ + Added a contributed port/demo that allows FreeRTOS to be 'simulated' in a
+ Linux environment.
+
+ Minor changes:
+ + Updated the Stellaris uIP WEB server demos to include the new run time
+ statistics gathering feature - and include a served WEB page that
+ presents the information in a tabular format.
+ + Added in the lwIP port layer for the Coldfire MCF52259.
+ + Updated the CrossWorks LPC2368 WEB server to include an image in the
+ served content.
+ + Changed some of the timing in the initialisation of the LPC2368 MAC to
+ permit its use on all part revisions.
+ + Minor modifications to the core uIP code to remove some compiler warnings.
+ + Added xTaskGetApplicationTaskTag() function and updated the OpenWatcom
+ demo to make use of the new function.
+ + Added contributed demos for AVR32 AP7000, STM32 Primer 2 and STM32 using
+ Rowley Crossworks.
+ + Heap_1.c and Heap_2.c used to define structures for the purpose of data
+ alignment. These have been converted to unions to save a few bytes of
+ RAM that would otherwise be wasted.
+ + Remove the call to strncpy() used to copy the task name into the TCB when
+ the maximum task name is configured to be 1 byte long.
+
+Changes between V5.1.2 and V5.2.0 released March 14th 2009
+
+ + Optimised the queue send and receive functions (also used by semaphores).
+ + Replaced the standard critical sections used to protect BIOS calls in the
+ PC port to instead use scheduler locks. This is because the BIOS calls
+ always return with interrupts enabled.
+ + Corrected unclosed comments in boot.s.
+
+Changes between V5.1.1 and V5.1.2 released February 9th 2009
+
+ + Added NEC V850ES port and demo.
+ + Added NEC 78K0R port and demo.
+ + Added MCF52259 port and demo.
+ + Added the AT91SAM9XE port and demo.
+ + Updated the MCF52233 FEC driver to work around a silicon bug that
+ prevents the part auto negotiating some network parameters.
+ + Minor modifications to the MCF52233 makefile to permit it to be used
+ on Linux hosts.
+ + Updated the STM32 primer files to allow them to be built with the latest
+ version of the RIDE tools.
+ + Updated the threads.js Java script used for kernel aware debugging in
+ the Rowley CrossWorks IDE.
+
+
+Changes between V5.1.0 and V5.1.1 released November 20, 2008
+
+ + Added Coldfire MCF52233 WEB server demo using GCC and Eclipse.
+ + Added IAR MSP430 port and demo.
+ + Corrected several compiler time issues that had crept in as tool versions
+ change.
+ + Included FreeRTOS-uIP - a faster uIP. This is not yet complete.
+
+Changes between V5.0.4 and V5.1.0 released October 24, 2008
+
+ + Added a new port and demo application for the ColdFire V2 core using the
+ CodeWarrior development tools.
+ + Replaced the ARM7 demo that used the old (and now no longer supported)
+ Keil compiler with a new port that uses the new Keil/RVDS combo.
+ + Stack overflow checking now works for stacks that grow up from low
+ memory (PIC24 and dsPIC).
+ + BUG FIX - set the PIC32 definition of portSTACK_GROWTH to the correct
+ value of -1.
+ + MSP430 port layers have been updated to permit tasks to place the
+ microcontroller into power down modes 1 to 3. The demo applications have
+ likewise been updated to demonstrate the new feature.
+ + Replaced the two separate MSP430/Rowley port layers with a single and more
+ flexible version.
+ + Added more contributed ports, including ports for NEC and SAM9
+ microcontrollers.
+ + Changed the linker script used in the LPC2368 Eclipse demo.
+
+Changes between V5.0.3 and V5.0.4 released September 22, 2008
+
+ + Completely re-written port for ColdFire GCC.
+ + Bug fix: All Cortex M3 ports have a minor change to the code that sets
+ the pending interrupt.
+ + Some header files require that FreeRTOS.h be included prior to their
+ inclusion. #error message have been added to all such header file
+ informing users to the cause of the compilation error should the headers
+ not be included in the correct order.
+
+Changes between V5.0.2 and V5.0.3 released July 31, 2008
+
+ Changes relating to the Cortex M3:
+
+ + Added configMAX_SYSCALL_INTERRUPT_PRIORITY usage to all the Cortex M3
+ ports and demos. See the port documentation pages on the FreeRTOS.org
+ WEB site for full usage information.
+ + Improved efficiency of Cortex M3 port even further.
+ + Ensure the Cortex M3 port works no matter where the vector table is
+ located.
+ + Added the IntQTimer demo/test tasks to a demo project for each CM3 port
+ (Keil, GCC and IAR) to test the new configMAX_SYSCALL_INTERRUPT_PRIORITY
+ functionality.
+ + Added the mainINCLUDE_WEB_SERVER definition to the LM3SXXXX IAR and Keil
+ projects to allow the WEB server to be conditionally excluded from the
+ build and therefore allow use of the KickStart (code size limited)
+ compiler version.
+
+ Other changes:
+
+ + Moved the PIC24 and dsPIC versions of vPortYield() from the C file to
+ an assembly file to allow use with all MPLAB compiler versions. This also
+ allows the omit-frame-pointer optimisation to be turned off.
+
+Changes between V5.0.0 and V5.0.2 released May 30, 2008
+
+ + Updated the PIC32 port to allow queue API calls to be used from
+ interrupts above the kernel interrupt priority, and to allow full
+ interrupt nesting. Task stack usages has also been reduced.
+ + Added a new PowerPC port that demonstrates how the trace macros can be
+ used to allow the use of a floating point co-processor. The
+ traceTASK_SWITCHED_OUT() and traceTASK_SWITCHED_INT() macros are used to
+ save and restore the floating point context respectively for those tasks
+ that actually use floating point operations.
+ + BUG FIX: The first PPC405 port contained a bug in that it did not leave
+ adequate space above the stack for the backchain to be saved when a task
+ started to execute for the first time.
+ + Updated queue.c to add in the means to allow interrupt nesting and for
+ queue API functions to be called from interrupts that have a priority
+ above the kernel priority. This is only supported on PIC32 ports thus
+ far.
+ + Fixed the compiler warnings that were generated when the latest version
+ of WinAVR was used.
+ + Remove all inline usage of 'inline' from the core kernel code.
+ + Added the queue registry feature. The queue registry is provided as a
+ means for kernel aware debuggers to locate queue definitions. It has no
+ purpose unless you are using a kernel aware debugger. The queue registry
+ will only be used when configQUEUE_REGISTRY_SIZE is greater than zero.
+ + Added the ST Cortex-M3 drivers into the Demo/Common/Drivers directory to
+ prevent them from having to be included in multiple demos.
+ + Added a Keil STM32 demo application.
+ + Changed the blocktim.c test files as it is no longer legitimate for all
+ ports to call queue API functions from within a critical section.
+ + Added the IntQueue.c test file to test the calling of queue API functions
+ from different interrupt priority levels, and test interrupt nesting.
+
+Changes between V5.0.0 and V5.0.1
+
+ + V5.0.1 was a customer specific release.
+
+Changes between V4.8.0 and V5.0.0 released April 15, 2008
+
+ *** VERY IMPORTANT INFORMATION ON UPGRADING TO FREERTOS.ORG V5.0.0 ***
+
+ The parameters to the functions xQueueSendFromISR(), xQueueSendToFrontFromISR(),
+ xQueueSendToBackFromISR() and xSemaphoreGiveFromISR() have changed. You must
+ update all calls to these functions to use the new calling convention! Your
+ compiler might not issue any type mismatch warnings!
+
+
+ Other changes:
+
+ + Support added for the new Luminary Micro LM3S3768 and LM3S3748 Cortex-M3
+ microcontrollers.
+ + New task hook feature added.
+ + PowerPC demo updated to use version 10.1 of the Xilinx EDK.
+ + Efficiency gains within the PIC32 port layer.
+
+Changes between V4.7.2 and V4.8.0 released March 26 2008
+
+ + Added a Virtex4 PowerPC 405 port and demo application.
+ + Added optional stack overflow checking and new
+ uxTaskGetStackHighWaterMark() function.
+ + Added new xQueueIsQueueEmptyFromISR(), xQueueIsQueueFullFromISR() and
+ uxQueueMessagesWaitingFromISR() API functions.
+ + Efficiency improvements to the Cortex-M3 port layer. NOTE: This
+ requires that an SVC handler be installed in the application.
+ + Efficiency improvements to the queue send and receive functions.
+ + Added new trace macros. These are application definable to provide
+ a flexible trace facility.
+ + Implemented the configKERNEL_INTERRUPT_PRIORITY within the Keil Cortex
+ M3 port layer (bringing it up to the same standard as the IAR and GCC
+ versions).
+ + Ports that used the arm-stellaris-eabi-gcc tools have been converted to
+ use the arm-non-eabi-gcc tools.
+
+Changes between V4.7.1 and V4.7.2 released February 21, 2008
+
+ + Added Fujitsu MB91460 port and demo.
+ + Added Fujitsu MB96340 port and demo.
+ + Tidied up the capitalisation of include files to facilitate builds on
+ Linux hosts.
+ + Removed some redundant casting that was generating warnings - but was
+ included to remove warnings on other compilers.
+
+Changes between V4.7.0 and V4.7.1 released February 3, 2008
+
+ + Updated all IAR ARM projects to use V5.11 of the IAR Embedded Workbench
+ for ARM.
+ + Introduced recursive semaphore feature.
+ + Updated LPC2368 demos to take into account silicon bugs in old chip
+ revisions.
+ + Updated STR9 uIP port to manually set the net mask and gateway addresses.
+ + Updating demos to allow more to run with the co-operative scheduler.
+ + Fixed co-operative scheduler behaviour upon the occurrence of a tick
+ interrupt while the scheduler was suspended.
+ + Updated documentation contained within semphr.h.
+ + ARM7 GCC ports no longer use the IRQ attribute.
+
+Changes between V4.6.1 and V4.7.0 released December 6, 2007
+
+ + Introduced the counting semaphore macros and demo source files. The
+ Open Watcom PC project has been updated to include the new demo. See
+ the online documentation for more information.
+ + Introduced the 'alternative' queue handling API and demo source files.
+ The Open Watcom PC project has been updated to include the new demo
+ source files. See the online documentation for more information.
+ + Added AT91SAM7X Eclipse demo project.
+ + Added the STM32 primer demo project for the GCC compiler and Ride IDE.
+ + Removed the .lock files that were mistakenly included in the V4.6.1
+ eclipse workspaces.
+
+Changes between V4.6.0 and V4.6.1 released November 5 2007
+
+ + Added support for the MIPS M4K based PIC32.
+ + Added 'extern "C"' to all the header files to facilitate use with C++.
+
+Changes between V4.5.0 and V4.6.0 released October 28 2007
+
+ + Changed the method used to force a context switch within an ISR for the
+ ARM7/9 GCC ports only. The portENTER_SWITCHING_ISR() and
+ portEXIT_SWITCHING_ISR() macros are no longer supported. This is to
+ ensure correct behaviour no matter which GCC version is used, with or
+ without the -fomit-frame-pointer option, and at all optimisation levels.
+ + Corrected the prototype for xQueueGenericSend() within queue.h.
+
+Changes between V4.4.0 and V4.5.0 released September 17 2007
+
+ + Added the xQueueSendToFront(), xQueueSendToBack() and xQueuePeek()
+ functionality. These should now be used in preference to the old
+ xQueueSend() function - which is maintained for backward compatibility.
+ + Added Mutex functionality. The behaviour of mutexes is subtly different
+ to the already existing binary semaphores as mutexes automatically
+ include a priority inheritance mechanism.
+ + Added the GenQTest.c and QPeek.c to test and demonstrate the behaviour
+ of the new functionality.
+ + Updated the LM3Sxxxx and PC ports to include the new GenQTest.c and
+ QPeek.c files.
+ + Updated the GCC port for the Cortex M3 to include the
+ configKERNEL_INTERRUPT_PRIORITY functionality. This was previously only
+ included in the IAR port.
+ + Optimised the GCC and IAR port layer code - specifically the context
+ switch code.
+ + Consolidated the LM3Sxxxx EK demos for all development tools into a
+ single project that automatically detects which version of the EK the
+ application is executing on.
+ + Added Eclipse support for LM3Sxxxx evaluation kits.
+ + Added Eclipse support for the Keil LPC2368 evaluation kit.
+ + Added the Demo/Drivers directory to hold code that is common to multiple
+ demo application projects.
+ + Included some minor bug fixes in the uIP 1.0 code.
+ + Added an lwIP demo for the STR9 - thanks ST for assistance.
+ + Updated the AVR32 port to ensure correct behaviour with full compiler
+ optimisation.
+ + Included binaries for OpenOCD FTDI and parallel port interfaces.
+
+Changes between V4.4.0 and V4.3.1 released July 31, 2007
+
+ + Added AVR32 UC3B demo application.
+ + Updated AVR32 UC3A port and demo applications.
+ + Added IAR lwIP demo for AVR32 UC3A.
+ + Updated listGET_OWNER_OF_NEXT_ENTRY() to assist compiler optimisation
+ (thanks Niu Yong for making the suggestion).
+ + Added xTaskGetSchedulerState() API function.
+ + BUG FIX: Corrected behaviour when tasks that are blocked indefinitely
+ have their block time adjusted (within xQueueSend() and xQueueReceive()),
+ and are the subject of a call the vTaskResume() when they are not
+ actually in the Suspended state (thanks Dan Searles for reporting the
+ issues).
+
+
+Changes between V4.3.0 and V4.3.1 released June 11, 2007
+
+ + Added STMicroelectronics STM32 Cortex-M3 demo application.
+ + Updated ustdlib.c for the GCC LM3S6965 demo.
+
+Changes between V4.2.1 and V4.3.0 released June 5, 2007
+
+ + Introduced configKERNEL_INTERRUPT_PRIORITY to the IAR Cortex-M3, PIC24
+ and dsPIC ports. See the LM3S6965 and PIC24 demo application
+ documentation pages for more information.
+ + Updated the PIC24 and dsPIC demos to build with V3.0 of the PIC30 GCC
+ tools, and changed the demo applications.
+ + Added demos for the new Ethernet and CAN enabled Luminary Micro Stellaris
+ microcontrollers.
+ + Corrected bug in uIP the demos that prevented frames of approximately 1480
+ bytes and over from being transmitted.
+ + Included the LPC2368/uIP/Rowley demo into the main FreeRTOS.org
+ download.
+ + Update to WizC PIC18 port to permit its use with version 14 of the
+ compiler. Thanks Marcel!
+
+Changes between V4.2.1 and V4.2.0 released April 2, 2007
+
+ + Added AVR32 AT32UC3A ports for GCC and IAR.
+ + Added -fomit-frame-pointer option to lwIP SAM7X demo makefile.
+ + Moved location of call to LCD_Init() in STR9 demo to ensure it is only
+ called after the scheduler has been started.
+
+Changes between V4.1.3 and V4.2.0 released February 8, 2007
+
+ + Changes to both task.c and queue.c as a result of testing performed on
+ the SafeRTOS code base.
+ + Added Cortex-M3 LM3S811 demos for GCC and IAR tools.
+
+Changes between V4.1.2 and V4.1.3 released November 19, 2006
+
+ + Added STR750 ARM7 port using the Raisonance RIDE/GCC tools.
+ + Added -fomit-frame-pointer option to Rowley ARM7 demos as work around
+ to GCC bug at some optimisation levels.
+ + Altered the way the heap is defined in the LM3S811 Keil demo to prevent
+ the RAM usage from counting toward the code size limit calculation.
+ + CO-ROUTINE BUG FIX: Removed the call to prvIsQueueEmpty from within
+ xQueueCRReceive as it exited with interrupts enabled. Thanks Paul Katz.
+ + Tasks that block on events with a timeout of portMAX_DELAY are now
+ blocked indefinitely if configINCLUDE_vTaskSuspend is defined.
+ Previously portMAX_DELAY was just the longest block time possible. This
+ is still the case if configINCLUDE_vTaskSuspend is not defined.
+ + Minor changes to some demo application files.
+
+Changes between V4.1.1 and V4.1.2 released October 21, 2006
+
+ + Added 16bit PIC ports and demos.
+ + Added STR750 port and demo.
+
+
+Changes between V4.1.0 and V4.1.1 released September 24, 2006
+
+ + Added the Luminary Micro Stellaris LM3S811 demo application.
+
+Changes between V4.0.5 and V4.1.0 released August 28, 2006
+
+ + Prior to V4.1.0, under certain documented circumstances, it was possible
+ for xQueueSend() and xQueueReceive() to return without having completed
+ and without their block time expiring. The block time effectively
+ stated a maximum block time, and the return value of the function needed
+ to be checked to determine the reason for returning. This is no longer
+ the case as the functions will only return once the block time has
+ expired or they are able to complete their operation. It is therefore no
+ longer necessary to wrap calls within loops.
+ + Changed the critical section handling in the IAR AVR port to correct the
+ behaviour when used with later compiler versions.
+ + Added the LPC2138 CrossWorks demo into the zip file. Previously this was
+ only available as a separate download.
+ + Modified the AVR demo applications to demonstrate the use of co-routines.
+
+Changes between V4.0.4 and V4.0.5 released August 13, 2006
+
+ + Introduced API function xTaskResumeFromISR(). Same functionality as
+ xTaskResume(), but can be called from within an interrupt service routine.
+ + Optimised vListInsert() in the case when the wake time is the maximum
+ tick count value.
+ + Bug fix: The 'value' of the event list item is updated when the priority
+ of a task is changed. Previously only the priority of the TCB itself was
+ changed.
+ + vTaskPrioritySet() and vTaskResume() no longer use the event list item.
+ This has not been necessary since V4.0.1 when the xMissedYield handling
+ was added.
+ + Lowered the PCLK setting on the ARM9 STR9 demo from 96MHz to 48MHz.
+ + When ending the scheduler - do not try to attempt a context switch when
+ deleting the current task.
+ + SAM7X EMAC drivers: Corrected the Rx frame length mask when obtaining
+ the length from the rx descriptor.
+
+
+Changes between V4.0.3 and V4.0.4 released June 22, 2006
+
+ + Added a port and demo application for the STR9 ARM9 based processors from
+ ST.
+ + Slight optimisation to the vTaskPrioritySet() function.
+ + Included the latest uIP version (1.0) in the demo/common/ethernet
+ directory.
+
+Changes between V4.0.2 and V4.0.3 released June 7, 2006
+
+ + Added a port and demo application for the Cortex-M3 target using the IAR
+ development tools.
+ + The ARM Cortex-m3 Rowley projects have been updated to use V1.6 of the
+ CrossStudio tools.
+ + The heap size defined for the lwIP Rowley demo has been reduced so that
+ the project will link correctly when using the command line GCC tools
+ also. The makefile has also been modified to allow debugging.
+ + The lwIP Rowley demo not includes a 'kernel aware' debug window.
+ + The uIP Rowley project has been updated to build with V1.6 of CrossWorks.
+ + The second set of tasks in the blockQ demo were created the wrong way
+ around (inconsistent to the description in the file). This has been
+ corrected.
+
+Changes between V4.0.1 and V4.0.2 released May 28, 2006
+
+ + Port and demo application added for the Tern Ethernet Engine controller.
+ + Port and demo application added for MC9S12 using GCC, thanks to
+ Jefferson "imajeff" Smith.
+ + The function vTaskList() now suspends the scheduler rather than disabling
+ interrupts during the creation of the task list.
+ + Allow a task to delete itself by passing in its own handle. Previously
+ this could only be done by passing in NULL.
+ + Corrected the value passed to the WDG_PeriodValueConfig() library
+ function in the STR71x demo.
+ + The tick hook function is now called only within a tick isr. Previously
+ it was also called when the tick function was called during the scheduler
+ unlocking process.
+ + The EMAC driver in the SAM7X lwIP demo has been made more robust as per
+ the thread: http://sourceforge.net/forum/message.php?msg_id=3714405
+ + In the PC ports: Add function prvSetTickFrequencyDefault() to set the
+ DOS tick back to its proper value when the scheduler exits. Thanks
+ Raynald!
+ + In the Borland x86 ports there was a mistake in the portFIRST_CONTEXT
+ macro where the BP register was not popped from the stack correctly. The
+ BP value would never get used so this did not cause a problem, but it has
+ been corrected all the same.
+
+
+Changes between V4.0.0 and V4.0.1 released April 7 2006
+
+ + Improved the ARM CORTEX M3 ports so they now only have to service
+ pendSV interrupts.
+ + Added a Luminary Micro port and demo for use with Rowley CrossWorks.
+ + Added the xMissedYield handling to tasks.c.
+
+Changes between V3.2.4 and V4.0.0
+
+ Major changes:
+
+ + Added new RTOS port for Luminary Micros ARM CORTEX M3 microcontrollers.
+ + Added new co-routine functionality.
+
+ Other kernel changes:
+
+ + An optional tick hook call is now included in the tick function.
+ + Introduced the xMiniListItem structure and removed the list pxHead
+ member in order to reduce RAM usage.
+ + Added the following definitions to the FreeRTOSConfig.h file included
+ with every port:
+ configUSE_TICK_HOOK
+ configUSE_CO_ROUTINES
+ configMAX_CO_ROUTINE_PRIORITIES
+ + The volatile qualification has been changed on the list members to allow
+ the task.c code to be tidied up a bit.
+ + The scheduler can now be started even if no tasks have been created!
+ This is to allow co-routines to run when there are no tasks.
+ + A task being woken by an event will now preempt the currently running task
+ even if its priority is only equal to the currently running task.
+
+ Port and demo application changes:
+
+ + Updated the WinAVR demo to compile with the latest version of WinAVR
+ with no warnings generated.
+ + Changed the WinAVR makefile to make chars signed - needed for the
+ co-routine code if BaseType_t is set to char.
+ + Added new demo application file crflash.c. This demonstrates co-routine
+ functionality including passing data between co-routines.
+ + Added new demo application file crhook.c. This demonstrates co-routine
+ and tick hook functionality including passing data between and ISR and
+ a co-routine.
+ + Some NOP's were missing following stmdb{}^ instructions in various ARM7
+ ports. These have been added.
+ + Updated the Open Watcom PC demo project to include the crflash and crhook
+ demo co-routines as an example of their use.
+ + Updated the H8S demo to compile with the latest version of GCC.
+ + Updated the SAM7X EMAC drivers to take into account the hardware errata
+ regarding lost packets.
+ + Changed the default MAC address used by some WEB server demos as the
+ original addresses used was not liked by some routers.
+ + Modified the SAM7X/IAR startup code slightly to prevent it hanging on
+ some systems when the code is executed using a j-link debugger. The
+ j-link macro file configures the PLL before the code executes so
+ attempting to configure it again in the startup code was causing a
+ problem for some user. Now a check is performed first to see if the
+ PLL is already set up.
+ + GCC port now contain all assembler code in a single asm block rather than
+ individual blocks as before.
+ + GCC LPC2000 code now explicitly uses R0 rather than letting the assembler
+ choose the register to use as a temporary register during the context
+ switch.
+ + Added portNOP() macro.
+ + The compare match load value on LPC2000 ports now has 1 added to correct
+ the value used.
+ + The minimal stack depth has been increased slightly on the WIZC PIC18
+ port.
+
+Changes between V3.2.3 and V3.2.4
+
+ + Modified the GCC ARM7 port layer to allow use with GCC V4.0.0 and above.
+ Many thanks to Glen Biagioni for the provided update.
+ + Added a new Microblaze port and demo application.
+ + Modified the SAM7X EMAC demo to default to use the MII interface rather
+ than the RMII interface.
+ + Modified the startup sequence of the SAM7X demo slightly to allow the
+ EMAC longer to auto negotiate.
+
+Changes between V3.2.2 and V3.2.3
+
+ + Added MII interface support to the SAM7X EMAC peripheral driver.
+ Previously versions worked with the RMII interface only.
+ + Added command line GCC support to the SAM7X lwIP demo. Previously the
+ project could only be built using the CrossWorks IDE. Modifications to
+ this end include the addition of a standard makefile and linker script to
+ the download, and some adjustments to the stacks allocated to each task.
+ + Changed the page returned by the lwIP WEB server demo to display the
+ task status table rather than the TCP/IP statistics.
+ + Corrected the capitalisation of some header file includes and makefile
+ dependencies to facilitate use on Linux host computers.
+ + The various LPC2000 ports had a mistake in the timer setup where the
+ prescale value was written to T0_PC instead of T0_PR. This would have
+ no effect unless a prescale value was actually required. This has been
+ corrected.
+
+Changes between V3.2.1 and V3.2.2 - Released 23 September, 2005
+
+ + Added an IAR port for the Philips LPC2129
+ + The Atmel ARM7 IAR demo project files are now saved in the IAR Embedded
+ Workbench V4.30a format.
+ + Updated the J-Link macro file included with the SAM7X uIP demo project
+ to allow the demo board to be reset over the J-Link.
+
+Changes between V3.2.0 and V3.2.1 - Released 1 September, 2005
+
+ + Added lwIP demo for AT91SAM7X using Rowley tools.
+ + Added uIP demo for AT91SAM7X using IAR tools.
+ + Added function xTaskGetCurrentTaskHandle().
+ + Renamed events.h to mevents.h to prevent it conflicting with the events.h
+ generated automatically by the HCS12 processor expert utility. events.h
+ is only used by the PC demo application.
+ + Both PIC18 ports now initialise the TBLPTRU to 0 as this is the value
+ expected by the compiler, and the compilers do not write to this
+ register.
+ + The HCS12 banked model demo now creates the 'suicide' tasks immediately
+ prior to starting the scheduler. These tasks should be the last tasks to
+ get started in order for the test to function correctly.
+
+Changes between V3.1.1 and V3.2.0 - Released 29 June, 2005
+
+ V3.2.0 introduces two new MSP430 ports and corrects a minor kernel
+ issues. Thanks to Ares.qi for his input.
+
+ + Added two MSP430 ports that use the Rowley CrossWorks development tools.
+ One port just mirrors the existing GCC port. The other port was provided
+ by Milos Prokic. Thanks!
+ + V3.2.0 corrects the behavior when vTaskPrioritySet() or vTaskResume()
+ are called while the scheduler is locked (by a call to
+ vTaskSuspendAll()). When this is done the subject task now starts to
+ execute immediately when the scheduler is unlocked if it has the highest
+ priority that is ready to run. Previously there was a possibility that
+ the task would not run until the next RTOS tick or call to portYIELD().
+ + Another similar small correction ensures that in the case where more than
+ one task is blocked on a semaphore or queue, the task with the highest
+ priority is guaranteed to be unblocked first.
+ + Added a couple of more test tasks to the PC demo which cover the points
+ above.
+
+Changes between V3.1.0 and V3.1.1 - Released 21st June, 2005
+
+ This release updates the HCS12 port. The common kernel code
+ remains unchanged.
+
+ + Updated the HCS12 port to support banking and introduced a demo
+ application for the MC9S12DP256. The new demo application is
+ located in the Demo/HCS12_CodeWarrior_banked directory.
+ + The name of the directory containing the MC9S12F32 demo application
+ has been changed to Demo/HCS12_CodeWarrior_small (as in 'small'
+ memory model).
+ + MC9S12F32 demo updated slightly to use the PLL. The CPU speed for the
+ demo application is now 24MHz. Previously it was 8MHz.
+ + The demo application file Demo/Common/Minimal/death.c has a slight
+ alteration to prevent it using floating point variables.
+
+
+Changes between V3.0.0 and V3.1.0 - Released 11th June, 2005
+
+ + Added new ports for ST Microsystems STR71x, and Freescale HCS12
+ microcontrollers. Currently the HCS12 port is limited to the small
+ memory model. Large memory models will be supported in the next
+ release.
+ + PIC18 wizC port updated. Thanks to Marcel van Lieshout for his
+ continuing contribution.
+ + The accuracy of the AVR port timer setup has been improved. Thanks to
+ Thomas Krutmann for this contribution.
+ + Added a new conditional compilation macro configIDLE_SHOULD_YIELD.
+ See the WEB documentation for details.
+ + Updated the CrossWorks uIP demo to build with V1.4 of CrossWorks.
+ + Slight modification to the SAM7 release build configuration to correct
+ an include path definition.
+ + Updated the MPLAB PIC18 documentation to provide extra details on linker
+ file configuration.
+
+Changes between V3.0.0 and V2.6.1 - Released 23rd April, 2005
+
+ V3.0.0 includes many enhancements, so this history list is broken into
+ subsections as follows:
+
+ API changes
+ New ports
+ Directory name changes
+ Kernel and miscellaneous changes changes
+
+ - API changes
+
+ + Each port now defines BaseType_t as the data type that is most
+ efficient for that architecture. The type BaseType_t is used
+ extensively in API calls necessitating the following changes to the
+ FreeRTOS API function prototypes.
+
+ See the "New for V3.0.0" section of the FreeRTOS online
+ documentation for full details of API changes.
+
+ - New ports
+
+ + The AT91FR40008 ARM7 port contributed by John Feller is now included
+ in the download (thanks John!).
+ + The PIC18 port for the wizC/fedC compiler contributed by Marcel van
+ Lieshout is now included in the download (thanks Marcel!).
+ + The IAR port for the AVR microcontroller has been upgraded to V3.0.0
+ and is now a supported port.
+
+ - Directory name changes
+
+ For consistency, and to allow integration of the new ports, the
+ following directory names have been changed.
+
+ + The source/portable/GCC/ARM7 directory has been renamed
+ source/portable/GCC/ARM7_LPC2000 so it is compatible with the naming
+ of other GCC ARM7 ports.
+ + The Demo/PIC directory has been renamed Demo/PIC18_MPLAB to
+ accommodate the wizC/fedC PIC port.
+ + The demo applications for the two AVR ports no longer share the same
+ directory. The WinAVR demo is in the Demo/AVR_ATMega323_WinAVR
+ directory and the IAR port in the Demo/AVR_ATMega323_IAR directory.
+
+
+ - Kernel and miscellaneous changes changes
+
+ See the "New for V3.0.0" section of the FreeRTOS online
+ documentation for more information.
+
+ + Previously 'portmacro.h' contained some user editable definitions
+ relating to the user application, and some fixed definitions relating
+ specifically to the port being used. The application specific
+ definitions have been removed from 'portmacro.h' and placed inside a
+ new header file called 'FreeRTOSConfig.h'. 'portmacro.h' should now
+ never be modified by the user. A 'FreeRTOSConfig.h' is now included
+ in each of FreeRTOS/Demo subdirectories - as it's settings relate to
+ the demo application rather than being specific to the port.
+ + Introduced configUSE_IDLE_HOOK in idle task.
+ + The idle task will yield when another idle priority task is ready to
+ run. Previously the idle task would run to the end of its time slice
+ regardless.
+ + The idle task is now created when the scheduler is started. This
+ requires less stack than the previous scheme where it was created upon
+ creation of the first application task.
+ + The function usPortCheckFreeStackSpace() has been renamed
+ usTaskCheckFreeStackSpace() and moved from the portable layer to
+ tasks.c.
+ + Corrected spelling of portMINMAL_STACK_SIZE to portMINIMAL_STACK_SIZE.
+ + The portheap.c file included with the AVR port has been deleted. The
+ AVR demo now uses the standard heap1 sample memory allocator.
+ + The GCC AVR port is now build using the standard make utility. The
+ batch files used previously have been deleted. This means a recent
+ version of WinAVR is required in order to create a binary suitable for
+ source level debugging.
+ + vTaskStartScheduler() no longer takes the configUSE_PREEMPTION
+ constant as a parameter. Instead the constant is used directly within
+ tasks.c and no parameter is required.
+ + The header file 'FreeRTOS.h' has been created and is used to include
+ 'projdefs.h', 'FreeRTOSConfig.h' and 'portable.h' in the necessary
+ order. FreeRTOS.h can now be included in place of these other
+ headers.
+ + The header file 'errors.h' has been deleted. The definitions it
+ contained are now located within 'projdefs.h'.
+ + pvPortMalloc() now takes a size_t parameter as per the ANSI malloc().
+ Previously an unsigned short was used.
+ + When resuming the scheduler a yield is performed if either a tick has
+ been missed, or a task is moved from the pending ready list into a
+ ready list. Previously a yield was not performed on this second
+ condition.
+ + In heap1.c an overflow check has been added to ensure the next free
+ byte variable does not wrap around.
+ + Introduced the portTASK_FUNCTION() and portTASK_FUNCTION_PROTO()
+ macros.
+ + The MPLAB PIC port now saved the TABLAT register in interrupt service
+ routines.
+
+Changes between V2.6.0 and V2.6.1 - Released Feb 22, 2005
+
+ This version adds support for the H8 processor.
+
+ Other changes:
+
+ + tskMAX_TASK_NAME_LEN removed from the task.h header and added to each
+ individual portmacro.h file as portMAX_TASK_NAME_LEN. This allows RAM
+ limited ports to allocate fewer characters to the task name.
+ + AVR port - Replaced the inb() and outb() functions with direct memory
+ access. This allows the port to be built with the 20050414 build of
+ WinAVR.
+ + GCC LPC2106 port - removed the 'static' from the definition of
+ vNonPreemptiveTick() to allow the demo to link when using the cooperative
+ scheduler.
+ + GCC LPC2106 port - Corrected the optimisation options in the batch files
+ ROM_THUMB.bat, RAM_THUMB.bat, ROM_ARM.bat and RAM_ARM.bat. The lower case
+ -o is replaced by an uppercase -O.
+ + Tasks.c - The strcpy call has been removed when copying across the task
+ name into the TCB.
+ + Updated the trace visualisation to always be 4 byte aligned so it can be
+ used on ARM architectures.
+ + There are now two tracecon executables (that convert the trace file binary
+ into an ASCII file). One for big endian targets and one for little endian
+ targets.
+ + Added ucTasksDeleted variable to prevent vTaskSuspendAll() being called
+ too often in the idle task.
+ + SAM7 USB driver - Replaced the duplicated RX_DATA_BK0 in the interrupt
+ mask with the RX_DATA_BK1.
+
+
+Changes between V2.5.5 and V2.6.0 - Released January 16, 2005
+
+ + Added the API function vTaskDelayUntil(). The demo app file
+ Demo/Common/Minimal/flash.c has been updated to demonstrate its use.
+ + Added INCLUDE_vTaskDelay conditional compilation.
+ + Changed the name of the Demo/ARM7_AtmelSAM7S64_IAR directory to
+ Demo/ARM7_AT91SAM7S64_IAR for consistency.
+ + Modified the AT91SAM7S USB driver to allow descriptors that have
+ a length that is an exact multiple of the FIFO to be transmitted.
+
+Changes between V2.5.4 and V2.5.5 - Released January 3, 2005
+
+ This version adds support for the Atmel SAM7 ARM7 microcontrollers
+ along with the IAR development tools.
+
+ Other changes:
+
+ + Renamed the Demo/ARM7 directory to Demo/ARM7_LPC2106_GCC.
+ + Renamed the Demo/ARM7_Keil directory to Demo/ARM7_LPC2129_Keil.
+ + Modified the Philips ARM7 serial interrupt service routines to only
+ process one interrupt per call. This seems to enable the ISR to
+ operate more quickly.
+ + Removed the 'far' keyword from the Open Watcom portable layer source
+ files. This allows their use with V1.3 of Open Watcom.
+ + Minor modifications to the SDCC build files to allow their use under
+ Linux. Thanks to Frieder Ferlemann for this contribution.
+ + Small change to sTaskCreate() to allow a context switch even when
+ pxCreatedTask is NULL. Thanks to Kamil for this contribution.
+ + inline keyword removed from vTaskSwitchContext() and VTaskIncrementTick()
+ definitions.
+
+Changes between V2.5.3 and V2.5.4 - Released Dec 1, 2004
+
+ This is an important maintenance release.
+
+ The function cTaskResumeAll() has been modified so it can be used safely
+ prior to the kernel being initialised. This was an issue as
+ cTaskResumeAll() is called from pvPortMalloc(). Thanks to Daniel Braun
+ for highlighting this issue.
+
+Changes between V2.5.2 and V2.5.3 - Released Nov 2, 2004
+
+ The critical section handling functions have been changed for the GCC ARM7
+ port. Some optimisation levels use the stack differently to others. This
+ means the interrupt flags cannot always be stored on the stack and are
+ instead now stored in a variable, which is then saved as part of the
+ tasks context. This allows the GCC ARM7 port to be used at all
+ optimisation levels - including -Os.
+
+ Other minor changes:
+
+ + MSP430 definition of usCriticalNesting now uses the volatile qualifier.
+ This is probably not required but added just in case.
+
+Changes between V2.5.1 and V2.5.2 - Released Oct 26, 2004
+
+ + Added the Keil ARM7 port.
+ + Slight modification to comtest.c to make the delay periods more random.
+ This creates a better test condition.
+
+Changes between V2.5.0 and V2.5.1 - Released Oct 9, 2004
+
+ + Added the MSP430 port.
+ + Extra comments added to the GCC ARM7 port.c and portISR.c files.
+ + The memory pool allocated within heap_1.c has been placed within a
+ structure to ensure correct memory alignment on 32bit systems.
+ + Within the GCC ARM7 serial drivers an extra check is made to ensure
+ the post to the queue was successful if then attempting immediately
+ retrieve the posted character.
+ + Changed the name of the constant portTICKS_PER_MS to portTICK_PERIOD_MS
+ as the old name was misleading.
+
+
+Changes between V2.4.2 and V2.5.0 - Released Aug 12, 2004
+
+ The RTOS source code download now includes three separate memory allocation
+ schemes - so you can choose the most appropriate for your application.
+ These are found in the Source/Portable/MemMang directory. The demo
+ application projects have also been updated to demonstrate the new schemes.
+ See the "Memory Management" page of the API documentation for more details.
+
+ + Added heap_1.c, heap_2.c and heap_3.c in the Source/Portable/MemMang
+ directory.
+ + Replaced the portheap.c files for each demo application with one of the
+ new memory allocation files.
+ + Updated the portmacro.h file for each demo application to include the
+ constants required for the new memory allocators: portTOTAL_HEAP_SIZE and
+ portBYTE_ALIGNMENT.
+ + Added a new test to the ARM7 demo application that tests the operation
+ of the heap_2 memory allocator.
+
+
+Changes between V2.4.1 and V2.4.2 - Released July 14, 2004
+
+ + The ARM7 port now supports THUMB mode.
+ + Modification to the ARM7 demo application serial port driver.
+
+Changes between V2.4.0 and V2.4.1 - Released July 2, 2004
+
+ + Rationalised the ARM7 port version of portEXIT_CRITICAL() -
+ improvements provided by Bill Knight.
+ + Made demo serial driver more complete and robust.
+
+
+Changes between V2.4.0 and V2.3.1 - Released June 30, 2004
+
+ + Added the first ARM7 port - thanks to Bill Knight for the assistance
+ provided.
+ + Added extra files to the Demo/Common/Minimal directory. These are
+ equivalent to their Demo/Common/Full counterparts but with the
+ calls to the functions defined in print.c removed.
+ + Added TABLAT to the list of registers saved as part of a PIC18 context.
+
+Changes between V2.3.0 and V2.3.1 - Released June 25, 2004
+
+ + Changed the way the vector table is defined to be more portable.
+ + Corrected the definitions of SPH and SPL in portmacro.s90.
+ The previous definitions prevented V2.3.0 operating if the iom323.h
+ header file was included in portmacro.s90.
+
+Changes between V2.2.0 and V2.3.0 - Released June 19, 2004
+
+ + Added an AVR port that uses the IAR compiler.
+ + Explicit use of 'signed' qualifier on plain char types.
+ + Modified the Open Watcom project files to use 'signed' as the
+ default char type.
+ + Changed odd calculation of initial pxTopOfStack value when
+ portSTACK_GROWTH < 0.
+ + Added inline qualifier to context switch functions within task.c.
+ Ports that do not support the (non ANSI) inline keyword have the
+ inline #define'd away in their respective portmacro.h files.
+
+Changes between V2.1.1 and V2.2.0 - Released May 18, 2004
+
+ + Added Cygnal 8051 port.
+ + PCLATU and PCLATH are now saved as part of the PIC18 context. This
+ allows function pointers to be used within tasks. Thanks to Javier
+ Espeche for the enhancement.
+ + Minor changes to demo application files to reduce stack usage.
+ + Minor changes to prevent compiler warnings when compiling the new port.
+
+Changes between V2.1.0 and V2.1.1 - Released March 12, 2004
+
+ + Bug fix - pxCurrentTCB is now initialised before the call to
+ prvInitialiseTaskLists(). Previously pxCurrentTCB could be accessed
+ while null during the initialisation sequence. Thanks to Giuseppe
+ Franco for the correction.
+
+Changes between V2.0.0 and V2.1.0 - Released Feb 29, 2004
+
+ V2.1.0 has significant reworks that greatly reduce the amount of time
+ the kernel has interrupts disabled. The first section of modifications
+ listed here must be taken into account by users. The second section
+ are related to the kernel implementation and as such are transparent.
+
+ Section1 :
+
+ + The typedef TickType_t has been introduced. All delay times should
+ now use a variable of type TickType_t in place of the unsigned long's
+ used previously. API function prototypes have been updated
+ appropriately.
+ + The configuration macro USE_16_BIT_TICKS has been introduced. If set
+ to 1 TickType_t is defined as an unsigned short. If set to 0
+ TickType_t is defined as an unsigned long. See the configuration
+ section of the API documentation for more details.
+ + The configuration macro INCLUDE_vTaskSuspendAll is now obsolete.
+ + vTaskResumeAll() has been renamed cTaskResumeAll() as it now returns a
+ value (see the API documentation).
+ + ulTaskGetTickCount() has been renamed xTaskGetTickCount() as the type
+ it returns now depends on the USE_16_BIT_TICKS definition.
+ + cQueueReceive() must now >never< be used from within an ISR. Use the new
+ cQueueReceiveFromISR() function instead.
+
+ Section 2:
+
+ + A mechanism has been introduced that allows a queue to be accessed by
+ a task and ISR simultaneously.
+ + A "pending ready" queue has been introduced that enables interrupts to
+ be processed when the scheduler is suspended.
+ + The list implementation has been improved to provide faster item
+ removal.
+ + The scheduler now makes use of the scheduler suspend mechanism in places
+ where previously interrupts were disabled.
+
+Changes between V1.2.6 and V2.0.0 - Released Jan 31, 2004
+
+ + Introduced new API functions:
+ vTaskPriorityGet ()
+ vTaskPrioritySet ()
+ vTaskSuspend ()
+ vTaskResume ()
+ vTaskSuspendAll ()
+ vTaskResumeAll ()
+ + Added conditional compilation options that allow the components of the
+ kernel that are unused by an application to be excluded from the build.
+ See the Configuration section on the WEB site for more information (on
+ the API pages). The macros have been added to each portmacro.h file (
+ sometimes called prtmacro.h).
+ + Rearranged tasks.c.
+ + Added demo application file dynamic.c.
+ + Updated the PC demo application to make use of dynamic.c.
+ + Updated the documentation contained in the kernel header files.
+ + Creating a task now causes a context switch if the task being created
+ has a higher priority than the calling task - assuming the kernel is
+ running.
+ + vTaskDelete() now only causes a context switch if the calling task is
+ the task being deleted.
+
+Changes between V1.2.5 and V1.2.6 - Released December 31, 2003
+
+ Barring the change to the interrupt vector (PIC port) these are minor
+ enhancements.
+
+ + The interrupt vector used for the PIC master ISR has been changed from
+ 0x18 to 0x08 - where it should have always been. The incorrect address
+ still works but probably executes a number of NOP's before getting to the
+ ISR.
+ + Changed the baud rate used by the AVR demo application to 38400. This
+ has an error percentage of less than one percent with an 8MHz clock.
+ + Raised the priority of the Rx task in demo\full\comtest.c. This only
+ affects the Flashlite and PC ports. This was done to prevent the Rx
+ buffer becoming full.
+ + Reverted the Flashlite COM port driver back so it does not use the DMA.
+ The DMA appears to miss characters under stress. The Borland Flashlite
+ port was also calculating a register value incorrectly resulting in the
+ wrong DMA source address being used. The same code worked fine when
+ compiling with Open Watcom. Other minor enhancements were made to the
+ interrupt handling.
+ + Modified the PIC serial Rx ISR to check for and clear overrun errors.
+ Overrun errors seem to prevent any further characters being received.
+ + The PIC demo projects now have some optimisation switched on.
+
+
+Changes between V1.2.4 and V1.2.5
+
+ Small fix made to the PIC specific port.c file described below.
+
+ + Introduced portGLOBAL_INTERRUPT_FLAG definition to test the global
+ interrupt flag setting. Using the two bits defined within
+ portINITAL_INTERRUPT_STATE was causing the w register to get clobbered
+ before the test was performed.
+
+Changes between V1.2.3 and V1.2.4
+
+ V1.2.4 contains a release version of the PIC18 port.
+ An optional exception has been included with the GPL. See the licensing
+ section of www.FreeRTOS.org for details.
+
+ + The function xPortInitMinimal() has been renamed to
+ xSerialPortInitMinimal() and the function xPortInit() has been renamed
+ to xSerialPortInit().
+ + The function sSerialPutChar() has been renamed cSerialPutChar() and
+ the function return type chaned to portCHAR.
+ + The integer and flop tasks now include calls to tskYIELD(), allowing
+ them to be used with the cooperative scheduler.
+ + All the demo applications now use the integer and comtest tasks when the
+ cooperative scheduler is being used. Previously they were only used with
+ the preemptive scheduler.
+ + Minor changes made to operation of minimal versions of comtest.c and
+ integer.c.
+ + The ATMega port definition of portCPU_CLOSK_HZ definition changed to
+ 8MHz base 10, previously it base 16.
+
+
+
+Changes between V1.2.2a and V1.2.3
+
+ The only change of any significance is to the license, which has changed
+ from the Open Software License to the GNU GPL.
+
+ The zip file also contains a pre-release version of the PIC18 port. This
+ has not yet completed testing and as such does not constitute part of the
+ V1.2.3 release. It is still however covered by the GNU GPL.
+
+ There are minor source code changes to accommodate the PIC C compiler.
+ These mainly involve more explicit casting.
+
+ + sTaskCreate() has been modified slightly to make use of the
+ portSTACK_GROWTH macro. This is required for the PIC port where the
+ stack grows in the opposite direction to the other existing ports.
+ + prvCheckTasksWaitingTermination() has been modified slightly to bring
+ the decrementing of usCurrentNumberOfTasks within the critical section,
+ where it should have been since the creation of an eight bit port.
+
+Changes between V1.2.2 and V1.2.2a
+
+ The makefile and buildcoff.bat files included with the AVR demo application
+ have been modified for use with the September 2003 build of WinAVR. No
+ source files have changed.
+
+Changes between V1.2.1 and V1.2.2
+
+ There are only minor changes here to allow the PC and Flashlite 186 ports
+ to use the Borland V4.52 compiler, as supplied with the Flashlite 186
+ development kit.
+
+ + Introduced a BCC directory under source\portable. This contains all the
+ files specific to the Borland compiler port.
+ + Corrected the macro naming of portMS_PER_TICK to portTICKS_PER_MS.
+ + Modified comtest.c to increase the rate at which the string is
+ transmitted and received on the serial port. The Flashlite 186 demo
+ app baud rate has also been increased.
+ + The values of the constants used in both integer.c files have been
+ increased to force the Borland compiler to use 32 bit values. The
+ Borland optimiser placed the previous values in 16 bit registers, and in
+ So doing invalidated the test.
+
+Changes between V1.2.0 and V1.2.1
+
+ This version includes some minor changes to the list implementation aimed
+ at improving the context switch time - with is now approximately 10% faster.
+ Changes include the removal of some null pointer assignment checks. These
+ were redundant where the scheduler uses the list functions, but means any
+ user application choosing to use the same list functions must now check
+ that no NULL pointers are passed as a parameter.
+
+ The Flashlite 186 serial port driver has also been modified to use a DMA
+ channel for transmissions. The serial driver is fully functional but still
+ under development. Flashlite users may prefer to use V1.2.0 for now.
+
+ Details:
+
+ + Changed the baud rate for the ATMega323 serial test from 19200 to 57600.
+ + Use vSerialPutString() instead of single character puts in
+ Demo\Full\Comtest.c. This allows the use of the flashlite DMA serial
+ driver. Also the check variable only stops incrementing after two
+ consecutive failures.
+ + semtest.c creates four tasks, two of which operate at the idle priority.
+ The tasks that operate at the idle priority now use a lower expected
+ count than those running at a higher priority. This prevents the low
+ priority tasks from signalling an error because they have not been
+ scheduled enough time for each of them to count the shared variable to
+ the higher original value.
+ + The flashlite 186 serial driver now uses a DMA channel for transmissions.
+ + Removed the volatile modifier from the list function parameters. This was
+ only ever included to prevent compiler warnings. Now warnings are
+ removed by casting parameters where the calls are made.
+ + prvListGetOwnerOfNextEntry() and prvListGetOwnerOfHeadEntry() have been
+ removed from list.c and added as macros in list.h.
+ + usNumberOfItems has been added to the list structure. This removes the
+ need for a pointer comparison when checking if a list is empty, and so
+ is slightly faster.
+ + Removed the NULL check in vListRemove(). This makes the call faster but
+ necessitates any application code utilising the list implementation to
+ ensure NULL pointers are not passed.
+ + Renamed portTICKS_PER_MS definition to portMS_PER_TICK (milli seconds
+ per tick). This is what it always should have been.
+
+Changes between V1.01 and V1.2.0
+
+ The majority of these changes were made to accommodate the 8bit AVR port.
+ The scheduler workings have not changed, but some of the data types used
+ have been made more friendly to an eight bit environment.
+
+ Details:
+
+ + Changed the version numbering format.
+ + Added AVR port.
+ + Split the directory demo\common into demo\common\minimal and
+ demo\common\full. The files in the full directory are for systems with
+ a display (currently PC and Flashlite 186 demo's). The files in the
+ minimal directory are for systems with limited RAM and no display
+ (currently MegaAVR).
+ + Minor changes to demo application function prototypes to make more use
+ of 8bit data types.
+ + Within the scheduler itself the following functions have slightly
+ modified declarations to make use of 8bit data types where possible:
+ xQueueCreate(),
+ sQueueReceive(),
+ sQUeueReceive(),
+ usQueueMessageWaiting(),
+ sQueueSendFromISR(),
+ sSemaphoreTake(),
+ sSemaphoreGive(),
+ sSemaphoreGiveFromISR(),
+ sTaskCreate(),
+ sTaskMoveFromEventList().
+
+ Where the return type has changed the function name has also changed in
+ accordance with the naming convention. For example
+ usQueueMessageWaiting() has become ucQueueMessageWaiting().
+ + The definition tskMAX_PRIORITIES has been moved from task.h to
+ portmacro.h and renamed portMAX_PRIORITIES. This allows different
+ ports to allocate a different maximum number of priorities.
+ + By default the trace facility is off, previously USE_TRACE_FACILITY
+ was defined.
+ + comtest.c now uses a psuedo random delay between sends. This allows for
+ better testing as the interrupts do not arrive at regular intervals.
+ + Minor change to the Flashlite serial port driver. The driver is written
+ to demonstrate the scheduler and is not written to be efficient.
+
+
+
+Changes between V1.00 and V1.01
+
+ These changes improve the ports. The scheduler itself has not changed.
+
+ Improved context switch mechanism used when performing a context
+ switch from an ISR (both the tick ISR and the serial comms ISR's within
+ the demo application). The new mechanism is faster and uses less stack.
+
+ The assembler file portasm.asm has been replaced by a header file
+ portasm.h. This includes a few assembler macro definitions.
+
+ All saving and restoring of registers onto/off of the stack is now handled
+ by the compiler. This means the initial stack setup for a task has to
+ mimic the stack used by the compiler, which is different for debug and
+ release builds.
+
+ Slightly changed the operation of the demo application, details below.
+
+ Details:
+
+ + portSWITCH_CONTEXT() replaced by vPortFirstContext().
+ + pxPortInitialiseStack() modified to replicate the stack used by the
+ compiler.
+ + portasm.asm file removed.
+ + portasm.h introduced. This contains macro definitions for
+ portSWITCH_CONTEXT() and portFIRST_CONTEXT().
+ + Context switch from ISR now uses the compiler generated interrupt
+ mechanism. This is done simply by calling portSWITCH_CONTEXT and leaving
+ the save/restore to compiler generated code.
+ + Calls to taskYIELD() during ISR's have been replaced by calling the
+ simpler and faster portSWITCH_CONTEXT().
+ + The Flashlite 186 port now uses 186 instruction set (used to use 80x86
+ instructions only).
+ + The blocking queue tasks within the demo application did not operate
+ quite as described. This has been corrected.
+ + The priority of the comtest Rx task within the demo application has been
+ lowered. Received characters are now processed (read from the queue) at
+ the idle priority, allowing low priority tasks to run evenly at times of
+ a high communications overhead.
+ + Prevent the call to kbhit() in main.c for debug builds as the debugger
+ seems to have problems stepping over the call. This if for the PC port
+ only.
+
+
+
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