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104 lines
4.4 KiB
C
104 lines
4.4 KiB
C
/*
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FreeRTOS V7.0.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* FreeRTOS tutorial books are available in pdf and paperback. *
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* Complete, revised, and edited pdf reference manuals are also *
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* available. *
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* *
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* Purchasing FreeRTOS documentation will not only help you, by *
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* ensuring you get running as quickly as possible and with an *
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* in-depth knowledge of how to use FreeRTOS, it will also help *
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* the FreeRTOS project to continue with its mission of providing *
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* professional grade, cross platform, de facto standard solutions *
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* for microcontrollers - completely free of charge! *
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* *
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* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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* *
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* Thank you for using FreeRTOS, and thank you for your support! *
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* *
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***************************************************************************
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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 modification to the GPL is included to allow you to
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distribute a combined work that includes FreeRTOS without being obliged to
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provide the source code for proprietary components outside of the FreeRTOS
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kernel. FreeRTOS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or 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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1 tab == 4 spaces!
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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 "FreeRTOS.h"
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#include "semphr.h"
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#define isrCLEAR_EINT_1 2
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/*
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* Interrupt routine that simply wakes vButtonHandlerTask on each interrupt
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* generated by a push of the built in button. The wrapper takes care of
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* the ISR entry. This then calls the actual handler function to perform
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* the work. This work should not be done in the wrapper itself unless
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* you are absolutely sure that no stack space is used.
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*/
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void vButtonISRWrapper( void ) __attribute__ ((naked));
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void vButtonHandler( void ) __attribute__ ((noinline));
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void vButtonHandler( void )
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{
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extern xSemaphoreHandle xButtonSemaphore;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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xSemaphoreGiveFromISR( xButtonSemaphore, &xHigherPriorityTaskWoken );
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if( xHigherPriorityTaskWoken )
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{
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/* We have woken a task. Calling "yield from ISR" here will ensure
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the interrupt returns to the woken task if it has a priority higher
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than the interrupted task. */
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portYIELD_FROM_ISR();
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}
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EXTINT = isrCLEAR_EINT_1;
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VICVectAddr = 0;
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}
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/*-----------------------------------------------------------*/
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void vButtonISRWrapper( void )
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{
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/* Save the context of the interrupted task. */
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portSAVE_CONTEXT();
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/* Call the handler to do the work. This must be a separate function to
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the wrapper to ensure the correct stack frame is set up. */
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__asm volatile( "bl vButtonHandler" );
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/* Restore the context of whichever task is going to run once the interrupt
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completes. */
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portRESTORE_CONTEXT();
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}
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