| /* | |
| FreeRTOS.org V5.3.0 - Copyright (C) 2003-2009 Richard Barry. | |
| This file is part of the FreeRTOS.org distribution. | |
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| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| more details. | |
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| Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
| *************************************************************************** | |
| * * | |
| * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation * | |
| * * | |
| * 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. * | |
| * * | |
| *************************************************************************** | |
| 1 tab == 4 spaces! | |
| 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, | |
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| */ | |
| RSEG ICODE:CODE | |
| CODE32 | |
| EXTERN vTaskSwitchContext | |
| PUBLIC vPortYieldProcessor | |
| PUBLIC vPortStartFirstTask | |
| #include "ISR_Support.h" | |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
| ; Starting the first task is just a matter of restoring the context that | |
| ; was created by pxPortInitialiseStack(). | |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
| vPortStartFirstTask: | |
| portRESTORE_CONTEXT | |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
| ; Manual context switch function. This is the SWI hander. | |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; | |
| vPortYieldProcessor: | |
| ADD LR, LR, #4 ; Add 4 to the LR to make the LR appear exactly | |
| ; as if the context was saved during and IRQ | |
| ; handler. | |
| portSAVE_CONTEXT ; Save the context of the current task... | |
| LDR R0, =vTaskSwitchContext ; before selecting the next task to execute. | |
| MOV lr, pc | |
| BX R0 | |
| portRESTORE_CONTEXT ; Restore the context of the selected task. | |
| END | |