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Diffstat (limited to 'FreeRTOS/Source/portable/Rowley/MSP430F449/port.c')
| -rw-r--r-- | FreeRTOS/Source/portable/Rowley/MSP430F449/port.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/FreeRTOS/Source/portable/Rowley/MSP430F449/port.c b/FreeRTOS/Source/portable/Rowley/MSP430F449/port.c new file mode 100644 index 000000000..9c3f2d277 --- /dev/null +++ b/FreeRTOS/Source/portable/Rowley/MSP430F449/port.c @@ -0,0 +1,211 @@ +/*
+ FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
+
+
+ ***************************************************************************
+ * *
+ * FreeRTOS tutorial books are available in pdf and paperback. *
+ * Complete, revised, and edited pdf reference manuals are also *
+ * available. *
+ * *
+ * Purchasing FreeRTOS documentation will not only help you, by *
+ * ensuring you get running as quickly as possible and with an *
+ * in-depth knowledge of how to use FreeRTOS, it will also help *
+ * the FreeRTOS project to continue with its mission of providing *
+ * professional grade, cross platform, de facto standard solutions *
+ * for microcontrollers - completely free of charge! *
+ * *
+ * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
+ * *
+ * Thank you for using FreeRTOS, and thank you for your support! *
+ * *
+ ***************************************************************************
+
+
+ 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. See the GNU General Public License for
+ more details. You should have received a copy of the GNU General Public
+ License and the FreeRTOS license exception along with FreeRTOS; if not it
+ can be viewed here: http://www.freertos.org/a00114.html and also obtained
+ by writing to Richard Barry, contact details for whom are available on the
+ FreeRTOS WEB site.
+
+ 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, training, latest information,
+ license and contact details.
+
+ http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
+ including FreeRTOS+Trace - an indispensable productivity tool.
+
+ Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
+ the code with commercial support, indemnification, and middleware, under
+ the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
+ provide a safety engineered and independently SIL3 certified version under
+ the SafeRTOS brand: http://www.SafeRTOS.com.
+*/
+
+/* Scheduler includes. */
+#include "FreeRTOS.h"
+#include "task.h"
+
+/*-----------------------------------------------------------
+ * Implementation of functions defined in portable.h for the MSP430 port.
+ *----------------------------------------------------------*/
+
+/* Constants required for hardware setup. The tick ISR runs off the ACLK,
+not the MCLK. */
+#define portACLK_FREQUENCY_HZ ( ( portTickType ) 32768 )
+#define portINITIAL_CRITICAL_NESTING ( ( unsigned short ) 10 )
+#define portFLAGS_INT_ENABLED ( ( portSTACK_TYPE ) 0x08 )
+
+/* We require the address of the pxCurrentTCB variable, but don't want to know
+any details of its type. */
+typedef void tskTCB;
+extern volatile tskTCB * volatile pxCurrentTCB;
+
+/* Each task maintains a count of the critical section nesting depth. Each
+time a critical section is entered the count is incremented. Each time a
+critical section is exited the count is decremented - with interrupts only
+being re-enabled if the count is zero.
+
+usCriticalNesting will get set to zero when the scheduler starts, but must
+not be initialised to zero as this will cause problems during the startup
+sequence. */
+volatile unsigned short usCriticalNesting = portINITIAL_CRITICAL_NESTING;
+/*-----------------------------------------------------------*/
+
+
+/*
+ * Sets up the periodic ISR used for the RTOS tick. This uses timer 0, but
+ * could have alternatively used the watchdog timer or timer 1.
+ */
+void prvSetupTimerInterrupt( void );
+/*-----------------------------------------------------------*/
+
+/*
+ * Initialise the stack of a task to look exactly as if a call to
+ * portSAVE_CONTEXT had been called.
+ *
+ * See the header file portable.h.
+ */
+portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
+{
+ /*
+ Place a few bytes of known values on the bottom of the stack.
+ This is just useful for debugging and can be included if required.
+
+ *pxTopOfStack = ( portSTACK_TYPE ) 0x1111;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0x2222;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0x3333;
+ pxTopOfStack--;
+ */
+
+ /* The msp430 automatically pushes the PC then SR onto the stack before
+ executing an ISR. We want the stack to look just as if this has happened
+ so place a pointer to the start of the task on the stack first - followed
+ by the flags we want the task to use when it starts up. */
+ *pxTopOfStack = ( portSTACK_TYPE ) pxCode;
+ pxTopOfStack--;
+ *pxTopOfStack = portFLAGS_INT_ENABLED;
+ pxTopOfStack--;
+
+ /* Next the general purpose registers. */
+ *pxTopOfStack = ( portSTACK_TYPE ) 0x4444;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0x5555;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0x6666;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0x7777;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0x8888;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0x9999;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0xaaaa;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0xbbbb;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0xcccc;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0xdddd;
+ pxTopOfStack--;
+ *pxTopOfStack = ( portSTACK_TYPE ) 0xeeee;
+ pxTopOfStack--;
+
+ /* When the task starts is will expect to find the function parameter in
+ R15. */
+ *pxTopOfStack = ( portSTACK_TYPE ) pvParameters;
+ pxTopOfStack--;
+
+ /* A variable is used to keep track of the critical section nesting.
+ This variable has to be stored as part of the task context and is
+ initially set to zero. */
+ *pxTopOfStack = ( portSTACK_TYPE ) portNO_CRITICAL_SECTION_NESTING;
+
+ /* Return a pointer to the top of the stack we have generated so this can
+ be stored in the task control block for the task. */
+ return pxTopOfStack;
+}
+/*-----------------------------------------------------------*/
+
+void vPortEndScheduler( void )
+{
+ /* It is unlikely that the MSP430 port will get stopped. If required simply
+ disable the tick interrupt here. */
+}
+/*-----------------------------------------------------------*/
+
+/*
+ * Hardware initialisation to generate the RTOS tick. This uses timer 0
+ * but could alternatively use the watchdog timer or timer 1.
+ */
+void prvSetupTimerInterrupt( void )
+{
+ /* Ensure the timer is stopped. */
+ TACTL = 0;
+
+ /* Run the timer of the ACLK. */
+ TACTL = TASSEL_1;
+
+ /* Clear everything to start with. */
+ TACTL |= TACLR;
+
+ /* Set the compare match value according to the tick rate we want. */
+ TACCR0 = portACLK_FREQUENCY_HZ / configTICK_RATE_HZ;
+
+ /* Enable the interrupts. */
+ TACCTL0 = CCIE;
+
+ /* Start up clean. */
+ TACTL |= TACLR;
+
+ /* Up mode. */
+ TACTL |= MC_1;
+}
+/*-----------------------------------------------------------*/
+
+
+
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