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jeremybenn |
;/*
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; FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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;
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; ***************************************************************************
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; * *
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; * If you are: *
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; * *
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; * + New to FreeRTOS, *
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; * + Wanting to learn FreeRTOS or multitasking in general quickly *
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; * + Looking for basic training, *
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; * + Wanting to improve your FreeRTOS skills and productivity *
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; * *
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; * then take a look at the FreeRTOS books - available as PDF or paperback *
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; * *
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; * "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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; * http://www.FreeRTOS.org/Documentation *
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; * *
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; * A pdf reference manual is also available. Both are usually delivered *
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; * to your inbox within 20 minutes to two hours when purchased between 8am *
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; * and 8pm GMT (although please allow up to 24 hours in case of *
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; * exceptional circumstances). Thank you for your support! *
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; * *
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; ***************************************************************************
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;
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; This file is part of the FreeRTOS distribution.
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;
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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
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; a 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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; 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. You should have received a copy of the GNU General Public
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; License and the FreeRTOS license exception along with FreeRTOS; if not it
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; can be viewed here: http://www.freertos.org/a00114.html and also obtained
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; by writing to Richard Barry, contact details for whom are available on the
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; FreeRTOS WEB site.
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;
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; 1 tab == 4 spaces!
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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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