/* | |
FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd. | |
All rights reserved | |
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. | |
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. Full license text is available on the following | |
link: http://www.freertos.org/a00114.html | |
*************************************************************************** | |
* * | |
* FreeRTOS provides completely free yet professionally developed, * | |
* robust, strictly quality controlled, supported, and cross * | |
* platform software that is more than just the market leader, it * | |
* is the industry's de facto standard. * | |
* * | |
* Help yourself get started quickly while simultaneously helping * | |
* to support the FreeRTOS project by purchasing a FreeRTOS * | |
* tutorial book, reference manual, or both: * | |
* http://www.FreeRTOS.org/Documentation * | |
* * | |
*************************************************************************** | |
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading | |
the FAQ page "My application does not run, what could be wrong?". Have you | |
defined configASSERT()? | |
http://www.FreeRTOS.org/support - In return for receiving this top quality | |
embedded software for free we request you assist our global community by | |
participating in the support forum. | |
http://www.FreeRTOS.org/training - Investing in training allows your team to | |
be as productive as possible as early as possible. Now you can receive | |
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers | |
Ltd, and the world's leading authority on the world's leading RTOS. | |
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool, a DOS | |
compatible FAT file system, and our tiny thread aware UDP/IP stack. | |
http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate. | |
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS. | |
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High | |
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS | |
licenses offer ticketed support, indemnification and commercial middleware. | |
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. | |
1 tab == 4 spaces! | |
*/ | |
#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 | |