diff options
| author | richardbarry <richardbarry@1d2547de-c912-0410-9cb9-b8ca96c0e9e2> | 2013-08-25 01:01:18 +0000 |
|---|---|---|
| committer | richardbarry <richardbarry@1d2547de-c912-0410-9cb9-b8ca96c0e9e2> | 2013-08-25 01:01:18 +0000 |
| commit | 767f2d8bd32567d1b96d92169651718481693ef1 (patch) | |
| tree | ed5547a7a2a3646076d511ed2a0a14e5241c19a0 /FreeRTOS/Source | |
| parent | eefeb8793551ff5b64eb6b8fceb5cb03ebadb793 (diff) | |
| download | freertos-767f2d8bd32567d1b96d92169651718481693ef1.tar.gz | |
Starting point for Keil Cortex-M0 port.
git-svn-id: http://svn.code.sf.net/p/freertos/code/trunk@2006 1d2547de-c912-0410-9cb9-b8ca96c0e9e2
Diffstat (limited to 'FreeRTOS/Source')
| -rw-r--r-- | FreeRTOS/Source/portable/RVDS/ARM_CM0/port.c | 310 | ||||
| -rw-r--r-- | FreeRTOS/Source/portable/RVDS/ARM_CM0/portmacro.h | 143 |
2 files changed, 453 insertions, 0 deletions
diff --git a/FreeRTOS/Source/portable/RVDS/ARM_CM0/port.c b/FreeRTOS/Source/portable/RVDS/ARM_CM0/port.c new file mode 100644 index 000000000..4cee00c39 --- /dev/null +++ b/FreeRTOS/Source/portable/RVDS/ARM_CM0/port.c @@ -0,0 +1,310 @@ +/*
+ FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd.
+
+ VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
+
+ ***************************************************************************
+ * *
+ * FreeRTOS provides completely free yet professionally developed, *
+ * robust, strictly quality controlled, supported, and cross *
+ * platform software that has become a de facto standard. *
+ * *
+ * Help yourself get started quickly and support the FreeRTOS *
+ * project by purchasing a FreeRTOS tutorial book, reference *
+ * manual, or both from: http://www.FreeRTOS.org/Documentation *
+ * *
+ * Thank you! *
+ * *
+ ***************************************************************************
+
+ This file is part of the FreeRTOS distribution.
+
+ FreeRTOS is free software; you can redistribute it and/or modify it under
+ the terms of the GNU General Public License (version 2) as published by the
+ Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
+
+ >>! NOTE: The modification to the GPL is included to allow you to distribute
+ >>! a combined work that includes FreeRTOS without being obliged to provide
+ >>! the source code for proprietary components outside of the FreeRTOS
+ >>! kernel.
+
+ FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ FOR A PARTICULAR PURPOSE. Full license text is available from the following
+ link: http://www.freertos.org/a00114.html
+
+ 1 tab == 4 spaces!
+
+ ***************************************************************************
+ * *
+ * Having a problem? Start by reading the FAQ "My application does *
+ * not run, what could be wrong?" *
+ * *
+ * http://www.FreeRTOS.org/FAQHelp.html *
+ * *
+ ***************************************************************************
+
+ http://www.FreeRTOS.org - Documentation, books, training, latest versions,
+ license and Real Time Engineers Ltd. contact details.
+
+ http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
+ including FreeRTOS+Trace - an indispensable productivity tool, a DOS
+ compatible FAT file system, and our tiny thread aware UDP/IP stack.
+
+ http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
+ Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
+ licenses offer ticketed support, indemnification and middleware.
+
+ http://www.SafeRTOS.com - High Integrity Systems also provide a safety
+ engineered and independently SIL3 certified version for use in safety and
+ mission critical applications that require provable dependability.
+
+ 1 tab == 4 spaces!
+*/
+
+/*-----------------------------------------------------------
+ * Implementation of functions defined in portable.h for the ARM CM0 port.
+ *----------------------------------------------------------*/
+
+/* Scheduler includes. */
+#include "FreeRTOS.h"
+#include "task.h"
+
+/* Constants required to manipulate the NVIC. */
+#define portNVIC_SYSTICK_CTRL ( ( volatile unsigned long *) 0xe000e010 )
+#define portNVIC_SYSTICK_LOAD ( ( volatile unsigned long *) 0xe000e014 )
+#define portNVIC_INT_CTRL ( ( volatile unsigned long *) 0xe000ed04 )
+#define portNVIC_SYSPRI2 ( ( volatile unsigned long *) 0xe000ed20 )
+#define portNVIC_SYSTICK_CLK 0x00000004
+#define portNVIC_SYSTICK_INT 0x00000002
+#define portNVIC_SYSTICK_ENABLE 0x00000001
+#define portNVIC_PENDSVSET 0x10000000
+#define portMIN_INTERRUPT_PRIORITY ( 255UL )
+#define portNVIC_PENDSV_PRI ( portMIN_INTERRUPT_PRIORITY << 16UL )
+#define portNVIC_SYSTICK_PRI ( portMIN_INTERRUPT_PRIORITY << 24UL )
+
+/* Constants required to set up the initial stack. */
+#define portINITIAL_XPSR ( 0x01000000 )
+
+/* Constants used with memory barrier intrinsics. */
+#define portSY_FULL_READ_WRITE ( 15 )
+
+/* Each task maintains its own interrupt status in the critical nesting
+variable. */
+static unsigned portBASE_TYPE uxCriticalNesting = 0xaaaaaaaa;
+
+/*
+ * Setup the timer to generate the tick interrupts.
+ */
+static void prvSetupTimerInterrupt( void );
+
+/*
+ * Exception handlers.
+ */
+void xPortPendSVHandler( void );
+void xPortSysTickHandler( void );
+void vPortSVCHandler( void );
+
+/*
+ * Start first task is a separate function so it can be tested in isolation.
+ */
+static void vPortStartFirstTask( void );
+
+/*-----------------------------------------------------------*/
+
+/*
+ * See header file for description.
+ */
+portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
+{
+ /* Simulate the stack frame as it would be created by a context switch
+ interrupt. */
+ pxTopOfStack--; /* Offset added to account for the way the MCU uses the stack on entry/exit of interrupts. */
+ *pxTopOfStack = portINITIAL_XPSR; /* xPSR */
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) pxCode; /* PC */
+ pxTopOfStack -= 6; /* LR, R12, R3..R1 */
+ *pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R0 */
+ pxTopOfStack -= 8; /* R11..R4. */
+
+ return pxTopOfStack;
+}
+/*-----------------------------------------------------------*/
+
+__asm void vPortSVCHandler( void )
+{
+ extern pxCurrentTCB;
+
+ PRESERVE8
+
+ ldr r3, =pxCurrentTCB /* Restore the context. */
+ ldr r1, [r3] /* Use pxCurrentTCBConst to get the pxCurrentTCB address. */
+ ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */
+ adds r0, #16 /* Move to the high registers. */
+ ldmia r0!, {r4-r7} /* Pop the high registers. */
+ mov r8, r4
+ mov r9, r5
+ mov r10, r6
+ mov r11, r7
+
+ msr psp, r0 /* Remember the new top of stack for the task. */
+
+ subs r0, #32 /* Go back for the low registers that are not automatically restored. */
+ ldmia r0!, {r4-r7} /* Pop low registers. */
+ mov r1, r14 /* OR R14 with 0x0d. */
+ movs r0, #0x0d
+ orrs r1, r0
+ bx r1
+ nop
+}
+/*-----------------------------------------------------------*/
+
+__asm void vPortStartFirstTask( void )
+{
+ PRESERVE8
+
+ movs r0, #0x00 /* Locate the top of stack. */
+ ldr r0, [r0]
+ msr msp, r0 /* Set the msp back to the start of the stack. */
+ cpsie i /* Globally enable interrupts. */
+ svc 0 /* System call to start first task. */
+ nop
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * See header file for description.
+ */
+portBASE_TYPE xPortStartScheduler( void )
+{
+ /* Make PendSV, CallSV and SysTick the same priroity as the kernel. */
+ *(portNVIC_SYSPRI2) |= portNVIC_PENDSV_PRI;
+ *(portNVIC_SYSPRI2) |= portNVIC_SYSTICK_PRI;
+
+ /* Start the timer that generates the tick ISR. Interrupts are disabled
+ here already. */
+ prvSetupTimerInterrupt();
+
+ /* Initialise the critical nesting count ready for the first task. */
+ uxCriticalNesting = 0;
+
+ /* Start the first task. */
+ vPortStartFirstTask();
+
+ /* Should not get here! */
+ return 0;
+}
+/*-----------------------------------------------------------*/
+
+void vPortEndScheduler( void )
+{
+ /* It is unlikely that the CM0 port will require this function as there
+ is nothing to return to. */
+}
+/*-----------------------------------------------------------*/
+
+void vPortYield( void )
+{
+ /* Set a PendSV to request a context switch. */
+ *( portNVIC_INT_CTRL ) = portNVIC_PENDSVSET;
+
+ /* Barriers are normally not required but do ensure the code is completely
+ within the specified behaviour for the architecture. */
+ __dsb( portSY_FULL_READ_WRITE );
+ __isb( portSY_FULL_READ_WRITE );
+}
+/*-----------------------------------------------------------*/
+
+void vPortEnterCritical( void )
+{
+ portDISABLE_INTERRUPTS();
+ uxCriticalNesting++;
+ __dsb( portSY_FULL_READ_WRITE );
+ __isb( portSY_FULL_READ_WRITE );
+}
+/*-----------------------------------------------------------*/
+
+void vPortExitCritical( void )
+{
+ uxCriticalNesting--;
+ if( uxCriticalNesting == 0 )
+ {
+ portENABLE_INTERRUPTS();
+ }
+}
+/*-----------------------------------------------------------*/
+
+__asm void xPortPendSVHandler( void )
+{
+ extern vTaskSwitchContext
+ extern pxCurrentTCB
+
+ PRESERVE8
+
+ mrs r0, psp
+
+ ldr r3, =pxCurrentTCB /* Get the location of the current TCB. */
+ ldr r2, [r3]
+
+ subs r0, #32 /* Make space for the remaining low registers. */
+ str r0, [r2] /* Save the new top of stack. */
+ stmia r0!, {r4-r7} /* Store the low registers that are not saved automatically. */
+ mov r4, r8 /* Store the high registers. */
+ mov r5, r9
+ mov r6, r10
+ mov r7, r11
+ stmia r0!, {r4-r7}
+
+ push {r3, r14}
+ cpsid i
+ bl vTaskSwitchContext
+ cpsie i
+ pop {r2, r3} /* lr goes in r3. r2 now holds tcb pointer. */
+
+ ldr r1, [r2]
+ ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */
+ adds r0, #16 /* Move to the high registers. */
+ ldmia r0!, {r4-r7} /* Pop the high registers. */
+ mov r8, r4
+ mov r9, r5
+ mov r10, r6
+ mov r11, r7
+
+ msr psp, r0 /* Remember the new top of stack for the task. */
+
+ subs r0, #32 /* Go back for the low registers that are not automatically restored. */
+ ldmia r0!, {r4-r7} /* Pop low registers. */
+
+ bx r3
+}
+/*-----------------------------------------------------------*/
+
+void xPortSysTickHandler( void )
+{
+unsigned long ulDummy;
+
+ ulDummy = portSET_INTERRUPT_MASK_FROM_ISR();
+ {
+ /* Increment the RTOS tick. */
+ if( xTaskIncrementTick() != pdFALSE )
+ {
+ /* Pend a context switch. */
+ *(portNVIC_INT_CTRL) = portNVIC_PENDSVSET;
+ }
+ }
+ portCLEAR_INTERRUPT_MASK_FROM_ISR( ulDummy );
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * Setup the systick timer to generate the tick interrupts at the required
+ * frequency.
+ */
+void prvSetupTimerInterrupt( void )
+{
+ /* Configure SysTick to interrupt at the requested rate. */
+ *(portNVIC_SYSTICK_LOAD) = ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL;
+ *(portNVIC_SYSTICK_CTRL) = portNVIC_SYSTICK_CLK | portNVIC_SYSTICK_INT | portNVIC_SYSTICK_ENABLE;
+}
+/*-----------------------------------------------------------*/
+
diff --git a/FreeRTOS/Source/portable/RVDS/ARM_CM0/portmacro.h b/FreeRTOS/Source/portable/RVDS/ARM_CM0/portmacro.h new file mode 100644 index 000000000..8ab2dc79d --- /dev/null +++ b/FreeRTOS/Source/portable/RVDS/ARM_CM0/portmacro.h @@ -0,0 +1,143 @@ +/*
+ FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd.
+
+ VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
+
+ ***************************************************************************
+ * *
+ * FreeRTOS provides completely free yet professionally developed, *
+ * robust, strictly quality controlled, supported, and cross *
+ * platform software that has become a de facto standard. *
+ * *
+ * Help yourself get started quickly and support the FreeRTOS *
+ * project by purchasing a FreeRTOS tutorial book, reference *
+ * manual, or both from: http://www.FreeRTOS.org/Documentation *
+ * *
+ * Thank you! *
+ * *
+ ***************************************************************************
+
+ This file is part of the FreeRTOS distribution.
+
+ FreeRTOS is free software; you can redistribute it and/or modify it under
+ the terms of the GNU General Public License (version 2) as published by the
+ Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
+
+ >>! NOTE: The modification to the GPL is included to allow you to distribute
+ >>! a combined work that includes FreeRTOS without being obliged to provide
+ >>! the source code for proprietary components outside of the FreeRTOS
+ >>! kernel.
+
+ FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ FOR A PARTICULAR PURPOSE. Full license text is available from the following
+ link: http://www.freertos.org/a00114.html
+
+ 1 tab == 4 spaces!
+
+ ***************************************************************************
+ * *
+ * Having a problem? Start by reading the FAQ "My application does *
+ * not run, what could be wrong?" *
+ * *
+ * http://www.FreeRTOS.org/FAQHelp.html *
+ * *
+ ***************************************************************************
+
+ http://www.FreeRTOS.org - Documentation, books, training, latest versions,
+ license and Real Time Engineers Ltd. contact details.
+
+ http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
+ including FreeRTOS+Trace - an indispensable productivity tool, a DOS
+ compatible FAT file system, and our tiny thread aware UDP/IP stack.
+
+ http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
+ Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
+ licenses offer ticketed support, indemnification and middleware.
+
+ http://www.SafeRTOS.com - High Integrity Systems also provide a safety
+ engineered and independently SIL3 certified version for use in safety and
+ mission critical applications that require provable dependability.
+
+ 1 tab == 4 spaces!
+*/
+
+
+#ifndef PORTMACRO_H
+#define PORTMACRO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*-----------------------------------------------------------
+ * Port specific definitions.
+ *
+ * The settings in this file configure FreeRTOS correctly for the
+ * given hardware and compiler.
+ *
+ * These settings should not be altered.
+ *-----------------------------------------------------------
+ */
+
+/* Type definitions. */
+#define portCHAR char
+#define portFLOAT float
+#define portDOUBLE double
+#define portLONG long
+#define portSHORT short
+#define portSTACK_TYPE unsigned portLONG
+#define portBASE_TYPE long
+
+#if( configUSE_16_BIT_TICKS == 1 )
+ typedef unsigned portSHORT portTickType;
+ #define portMAX_DELAY ( portTickType ) 0xffff
+#else
+ typedef unsigned portLONG portTickType;
+ #define portMAX_DELAY ( portTickType ) 0xffffffff
+#endif
+/*-----------------------------------------------------------*/
+
+/* Architecture specifics. */
+#define portSTACK_GROWTH ( -1 )
+#define portTICK_RATE_MS ( ( portTickType ) 1000 / configTICK_RATE_HZ )
+#define portBYTE_ALIGNMENT 8
+/*-----------------------------------------------------------*/
+
+
+/* Scheduler utilities. */
+extern void vPortYield( void );
+#define portNVIC_INT_CTRL_REG ( * ( ( volatile unsigned long * ) 0xe000ed04 ) )
+#define portNVIC_PENDSVSET_BIT ( 1UL << 28UL )
+#define portYIELD() vPortYield()
+#define portEND_SWITCHING_ISR( xSwitchRequired ) if( xSwitchRequired ) portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT
+#define portYIELD_FROM_ISR( x ) portEND_SWITCHING_ISR( x )
+/*-----------------------------------------------------------*/
+
+
+/* Critical section management. */
+extern void vPortEnterCritical( void );
+extern void vPortExitCritical( void );
+#define portSET_INTERRUPT_MASK() __disable_irq()
+#define portCLEAR_INTERRUPT_MASK() __enable_irq()
+#define portSET_INTERRUPT_MASK_FROM_ISR() 0;portSET_INTERRUPT_MASK()
+#define portCLEAR_INTERRUPT_MASK_FROM_ISR(x) portCLEAR_INTERRUPT_MASK();(void)x
+#define portDISABLE_INTERRUPTS() portSET_INTERRUPT_MASK()
+#define portENABLE_INTERRUPTS() portCLEAR_INTERRUPT_MASK()
+#define portENTER_CRITICAL() vPortEnterCritical()
+#define portEXIT_CRITICAL() vPortExitCritical()
+
+/*-----------------------------------------------------------*/
+
+/* Task function macros as described on the FreeRTOS.org WEB site. */
+#define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
+#define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )
+
+#define portNOP()
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PORTMACRO_H */
+
|