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/* |
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FreeRTOS V5.4.1 - Copyright (C) 2009 Real Time Engineers Ltd. |
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This file is part of the FreeRTOS distribution. |
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FreeRTOS is free software; you can redistribute it and/or modify it under |
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the terms of the GNU General Public License (version 2) as published by the |
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Free Software Foundation and modified by the FreeRTOS exception. |
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**NOTE** The exception to the GPL is included to allow you to distribute a |
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combined work that includes FreeRTOS without being obliged to provide the |
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source code for proprietary components outside of the FreeRTOS kernel. |
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Alternative commercial license and support terms are also available upon |
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request. See the licensing section of http://www.FreeRTOS.org for full |
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license details. |
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT |
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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more details. |
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You should have received a copy of the GNU General Public License along |
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with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59 |
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Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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*************************************************************************** |
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* * |
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* Looking for a quick start? Then check out the FreeRTOS eBook! * |
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* See http://www.FreeRTOS.org/Documentation for details * |
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* * |
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*************************************************************************** |
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1 tab == 4 spaces! |
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Please ensure to read the configuration and relevant port sections of the |
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online documentation. |
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http://www.FreeRTOS.org - Documentation, latest information, license and |
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contact details. |
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http://www.SafeRTOS.com - A version that is certified for use in safety |
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critical systems. |
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http://www.OpenRTOS.com - Commercial support, development, porting, |
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licensing and training services. |
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*/ |
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#include "FreeRTOSConfig.h" |
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#include "portasm.h" |
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.CODE |
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/* |
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* The RTOS tick ISR. |
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* |
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* If the cooperative scheduler is in use this simply increments the tick |
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* count. |
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* |
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* If the preemptive scheduler is in use a context switch can also occur. |
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*/ |
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_vTickISR: |
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portSAVE_CONTEXT |
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call #_vTaskIncrementTick |
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#if configUSE_PREEMPTION == 1 |
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call #_vTaskSwitchContext |
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#endif |
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portRESTORE_CONTEXT |
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/*-----------------------------------------------------------*/ |
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/* |
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* Manual context switch called by the portYIELD() macro. |
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*/ |
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_vPortYield:: |
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/* Mimic an interrupt by pushing the SR. */ |
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push SR |
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/* Now the SR is stacked we can disable interrupts. */ |
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dint |
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/* Save the context of the current task. */ |
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portSAVE_CONTEXT |
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/* Switch to the highest priority task that is ready to run. */ |
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call #_vTaskSwitchContext |
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/* Restore the context of the new task. */ |
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portRESTORE_CONTEXT |
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/*-----------------------------------------------------------*/ |
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/* |
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* Start off the scheduler by initialising the RTOS tick timer, then restoring |
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* the context of the first task. |
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*/ |
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_xPortStartScheduler:: |
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/* Setup the hardware to generate the tick. Interrupts are disabled |
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when this function is called. */ |
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call #_prvSetupTimerInterrupt |
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/* Restore the context of the first task that is going to run. */ |
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portRESTORE_CONTEXT |
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/*-----------------------------------------------------------*/ |
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/* Place the tick ISR in the correct vector. */ |
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.VECTORS |
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.KEEP |
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ORG TIMERA0_VECTOR |
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DW _vTickISR |
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END |
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