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98 lines
3.5 KiB
C
98 lines
3.5 KiB
C
/*
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FreeRTOS V5.4.2 - 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 "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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