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88 lines
3.5 KiB
Plaintext
88 lines
3.5 KiB
Plaintext
;/*
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; FreeRTOS.org V5.2.0 - Copyright (C) 2003-2009 Richard Barry.
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;
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; This file is part of the FreeRTOS.org distribution.
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;
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; FreeRTOS.org is free software; you can redistribute it and/or modify it
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; under the terms of the GNU General Public License (version 2) as published
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; by the Free Software Foundation and modified by the FreeRTOS exception.
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;
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; FreeRTOS.org 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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;
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; You should have received a copy of the GNU General Public License along
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; with FreeRTOS.org; 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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; A special exception to the GPL is included to allow you to distribute a
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; combined work that includes FreeRTOS.org without being obliged to provide
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; the source code for any proprietary components. See the licensing section
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; of http://www.FreeRTOS.org for full details.
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;
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;
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; ***************************************************************************
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; * *
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; * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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; * *
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; * This is a concise, step by step, 'hands on' guide that describes both *
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; * general multitasking concepts and FreeRTOS specifics. It presents and *
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; * explains numerous examples that are written using the FreeRTOS API. *
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; * Full source code for all the examples is provided in an accompanying *
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; * .zip file. *
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; * *
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; ***************************************************************************
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;
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; 1 tab == 4 spaces!
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;
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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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;
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; http://www.FreeRTOS.org - Documentation, latest information, license and
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; contact details.
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;
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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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;
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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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RSEG ICODE:CODE
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CODE32
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EXTERN vPortPreemptiveTick
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EXTERN vTaskSwitchContext
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PUBLIC vPortYieldProcessor
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PUBLIC vPortStartFirstTask
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#include "ISR_Support.h"
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Starting the first task is just a matter of restoring the context that
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; was created by pxPortInitialiseStack().
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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vPortStartFirstTask:
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portRESTORE_CONTEXT
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Manual context switch function. This is the SWI hander.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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vPortYieldProcessor:
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ADD LR, LR, #4 ; Add 4 to the LR to make the LR appear exactly
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; as if the context was saved during and IRQ
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; handler.
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portSAVE_CONTEXT ; Save the context of the current task...
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LDR R0, =vTaskSwitchContext ; before selecting the next task to execute.
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mov lr, pc
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BX R0
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portRESTORE_CONTEXT ; Restore the context of the selected task.
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END
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