/* | |
FreeRTOS.org V5.1.0 - Copyright (C) 2003-2008 Richard Barry. | |
This file is part of the FreeRTOS.org distribution. | |
FreeRTOS.org is free software; you can redistribute it and/or modify | |
it under the terms of the GNU General Public License as published by | |
the Free Software Foundation; either version 2 of the License, or | |
(at your option) any later version. | |
FreeRTOS.org 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 FreeRTOS.org; 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 can be applied should you wish to distribute | |
a combined work that includes FreeRTOS.org, without being obliged to provide | |
the source code for any proprietary components. See the licensing section | |
of http://www.FreeRTOS.org for full details of how and when the exception | |
can be applied. | |
*************************************************************************** | |
*************************************************************************** | |
* * | |
* SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, * | |
* and even write all or part of your application on your behalf. * | |
* See http://www.OpenRTOS.com for details of the services we provide to * | |
* expedite your project. * | |
* * | |
*************************************************************************** | |
*************************************************************************** | |
Please ensure to read the configuration and relevant port sections of the | |
online documentation. | |
http://www.FreeRTOS.org - Documentation, latest information, license and | |
contact details. | |
http://www.SafeRTOS.com - A version that is certified for use in safety | |
critical systems. | |
http://www.OpenRTOS.com - Commercial support, development, porting, | |
licensing and training services. | |
*/ | |
#include "FreeRTOSConfig.h" | |
#include "portasm.h" | |
IMPORT vTaskIncrementTick | |
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 #vTaskIncrementTick | |
#if configUSE_PREEMPTION == 1 | |
call #vTaskSwitchContext | |
#endif | |
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 | |