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84 lines
3.0 KiB
C
84 lines
3.0 KiB
C
/*
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FreeRTOS.org V4.7.0 - Copyright (C) 2003-2007 Richard Barry.
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This file is part of the FreeRTOS.org distribution.
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FreeRTOS.org is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FreeRTOS.org is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FreeRTOS.org; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A special exception to the GPL can be applied should you wish to distribute
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a 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 of how and when the exception
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can be applied.
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***************************************************************************
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See http://www.FreeRTOS.org for documentation, latest information, license
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and contact details. Please ensure to read the configuration and relevant
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port sections of the online documentation.
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Also see http://www.SafeRTOS.com a version that has been certified for use
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in safety critical systems, plus commercial licensing, development and
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support options.
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***************************************************************************
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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 );
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void vButtonHandler( void )
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{
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extern xSemaphoreHandle xButtonSemaphore;
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if( xSemaphoreGiveFromISR( xButtonSemaphore, pdFALSE ) )
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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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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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