/* | |
FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd. | |
FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT | |
http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
*************************************************************************** | |
* * | |
* 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 Real Time Engineers Ltd., 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, 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, and our new | |
fully thread aware and reentrant UDP/IP stack. | |
http://www.OpenRTOS.com - 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.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. | |
*/ | |
#include "FreeRTOSConfig.h" | |
#include "portasm.h" | |
IMPORT xTaskIncrementTick | |
IMPORT vTaskSwitchContext | |
IMPORT vPortSetupTimerInterrupt | |
EXPORT vTickISR | |
EXPORT vPortYield | |
EXPORT xPortStartScheduler | |
RSEG CODE | |
/* | |
* 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. | |
*/ | |
vTickISR: | |
portSAVE_CONTEXT | |
call #xTaskIncrementTick | |
cmp.w #0x0, R12 | |
jeq SkipContextSwitch | |
call #vTaskSwitchContext | |
SkipContextSwitch: | |
portRESTORE_CONTEXT | |
/*-----------------------------------------------------------*/ | |
/* | |
* Manual context switch called by the portYIELD() macro. | |
*/ | |
vPortYield: | |
/* Mimic an interrupt by pushing the SR. */ | |
push SR | |
/* Now the SR is stacked we can disable interrupts. */ | |
dint | |
/* Save the context of the current task. */ | |
portSAVE_CONTEXT | |
/* Switch to the highest priority task that is ready to run. */ | |
call #vTaskSwitchContext | |
/* Restore the context of the new task. */ | |
portRESTORE_CONTEXT | |
/*-----------------------------------------------------------*/ | |
/* | |
* Start off the scheduler by initialising the RTOS tick timer, then restoring | |
* the context of the first task. | |
*/ | |
xPortStartScheduler: | |
/* 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. */ | |
portRESTORE_CONTEXT | |
/*-----------------------------------------------------------*/ | |
/* Install vTickISR as the timer A0 interrupt. */ | |
ASEG | |
ORG 0xFFE0 + TIMERA0_VECTOR | |
_vTickISR_: DC16 vTickISR | |
END | |