| ;/* | |
| ; FreeRTOS V5.4.2 - Copyright (C) 2009 Real Time Engineers Ltd. | |
| ; | |
| ; 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 exception 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. | |
| ; Alternative commercial license and support terms are also available upon | |
| ; request. See the licensing section of http://www.FreeRTOS.org for full | |
| ; license details. | |
| ; | |
| ; 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 along | |
| ; with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59 | |
| ; Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
| ; | |
| ; | |
| ; *************************************************************************** | |
| ; * * | |
| ; * Looking for a quick start? Then check out the FreeRTOS eBook! * | |
| ; * See http://www.FreeRTOS.org/Documentation for details * | |
| ; * * | |
| ; *************************************************************************** | |
| ; | |
| ; 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 | |
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| ;*/ | |
| RSEG ICODE:CODE | |
| CODE32 | |
| EXTERN vPortPreemptiveTick | |
| 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 | |