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jeremybenn |
/*
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FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* If you are: *
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* *
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* + New to FreeRTOS, *
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* + Wanting to learn FreeRTOS or multitasking in general quickly *
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* + Looking for basic training, *
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* + Wanting to improve your FreeRTOS skills and productivity *
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* *
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* then take a look at the FreeRTOS books - available as PDF or paperback *
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* *
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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* http://www.FreeRTOS.org/Documentation *
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* *
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* A pdf reference manual is also available. Both are usually delivered *
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* to your inbox within 20 minutes to two hours when purchased between 8am *
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* and 8pm GMT (although please allow up to 24 hours in case of *
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* exceptional circumstances). Thank you for your support! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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***NOTE*** The exception to the GPL is included to allow you to distribute
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a combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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1 tab == 4 spaces!
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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#include "msp430.h"
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#include "FreeRTOSConfig.h"
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#include "data_model.h"
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IMPORT vTaskIncrementTick
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IMPORT vTaskSwitchContext
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IMPORT vPortSetupTimerInterrupt
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IMPORT pxCurrentTCB
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IMPORT usCriticalNesting
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EXPORT vPortTickISR
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EXPORT vPortYield
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EXPORT xPortStartScheduler
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portSAVE_CONTEXT macro
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/* Save the remaining registers. */
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pushm_x #12, r15
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mov.w &usCriticalNesting, r14
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push_x r14
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mov_x &pxCurrentTCB, r12
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mov_x sp, 0( r12 )
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endm
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/*-----------------------------------------------------------*/
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portRESTORE_CONTEXT macro
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mov_x &pxCurrentTCB, r12
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mov_x @r12, sp
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pop_x r15
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mov.w r15, &usCriticalNesting
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popm_x #12, r15
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/* The last thing on the stack will be the status register.
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Ensure the power down bits are clear ready for the next
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time this power down register is popped from the stack. */
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bic.w #0xf0, 0( sp )
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pop.w sr
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reta
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endm
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/*-----------------------------------------------------------*/
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/*
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* The RTOS tick ISR.
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*
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* If the cooperative scheduler is in use this simply increments the tick
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* count.
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*
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* If the preemptive scheduler is in use a context switch can also occur.
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*/
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RSEG CODE
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EVEN
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vPortTickISR:
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/* The sr is not saved in portSAVE_CONTEXT() because vPortYield() needs
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to save it manually before it gets modified (interrupts get disabled). */
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push.w sr
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portSAVE_CONTEXT
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calla #vTaskIncrementTick
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#if configUSE_PREEMPTION == 1
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calla #vTaskSwitchContext
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#endif
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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/*
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* Manual context switch called by the portYIELD() macro.
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*/
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EVEN
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vPortYield:
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/* The sr needs saving before it is modified. */
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push.w sr
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/* Now the SR is stacked we can disable interrupts. */
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dint
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nop
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/* Save the context of the current task. */
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portSAVE_CONTEXT
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/* Select the next task to run. */
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calla #vTaskSwitchContext
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/* Restore the context of the new task. */
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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/*
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* Start off the scheduler by initialising the RTOS tick timer, then restoring
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* the context of the first task.
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*/
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EVEN
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xPortStartScheduler:
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/* Setup the hardware to generate the tick. Interrupts are disabled
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when this function is called. */
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calla #vPortSetupTimerInterrupt
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/* Restore the context of the first task that is going to run. */
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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END
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