blob: fcff058f893d7e184e4d18b26d055f9122575459 [file] [log] [blame]
FreeRTOS V7.2.0 - 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 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: 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? *
* *
* *
* *
*************************************************************************** - Documentation, training, latest information,
license and contact details. - 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: High Integrity Systems also
provide a safety engineered and independently SIL3 certified version under
the SafeRTOS brand:
#include "FreeRTOSConfig.h"
#include "portasm.h"
IMPORT vTaskIncrementTick
IMPORT vTaskSwitchContext
IMPORT vPortSetupTimerInterrupt
EXPORT vPortYield
EXPORT xPortStartScheduler
* 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 #vPortSetupTimerInterrupt
/* Restore the context of the first task that is going to run. */
/* Install vTickISR as the timer A0 interrupt. */
_vTickISR_: DC16 vTickISR