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/* V5.2.0 - Copyright (C) 2003-2009 Richard Barry.
This file is part of the distribution. 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. 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 along
with; if not, write to the Free Software Foundation, Inc., 59
Temple Place, Suite 330, Boston, MA 02111-1307 USA.
A special exception to the GPL is included to allow you to distribute a
combined work that includes without being obliged to provide
the source code for any proprietary components. See the licensing section
of for full details.
* *
* Get the FreeRTOS eBook! See *
* *
* This is a concise, step by step, 'hands on' guide that describes both *
* general multitasking concepts and FreeRTOS specifics. It presents and *
* explains numerous examples that are written using the FreeRTOS API. *
* Full source code for all the examples is provided in an accompanying *
* .zip file. *
* *
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#include "FreeRTOSConfig.h"
#include "portasm.h"
* The RTOS tick ISR.
* If the cooperative scheduler is in use this simply increments the tick
* count.
* If the preemptive scheduler is in use a context switch can also occur.
call #_vTaskIncrementTick
#if configUSE_PREEMPTION == 1
call #_vTaskSwitchContext
* Manual context switch called by the portYIELD() macro.
/* Mimic an interrupt by pushing the SR. */
push SR
/* Now the SR is stacked we can disable interrupts. */
/* Save the context of the current task. */
/* Switch to the highest priority task that is ready to run. */
call #_vTaskSwitchContext
/* Restore the context of the new task. */
* Start off the scheduler by initialising the RTOS tick timer, then restoring
* the context of the first task.
/* Setup the hardware to generate the tick. Interrupts are disabled
when this function is called. */
call #_prvSetupTimerInterrupt
/* Restore the context of the first task that is going to run. */
/* Place the tick ISR in the correct vector. */
DW _vTickISR