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116 lines
5.1 KiB
C
116 lines
5.1 KiB
C
/*
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FreeRTOS V8.1.1 - Copyright (C) 2014 Real Time Engineers Ltd.
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All rights reserved
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that has become a de facto standard. *
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* *
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* Help yourself get started quickly and support the FreeRTOS *
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* project by purchasing a FreeRTOS tutorial book, reference *
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* manual, or both from: http://www.FreeRTOS.org/Documentation *
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* *
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* Thank you! *
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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 !<<
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>>! obliged to provide the source code for proprietary components !<<
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>>! outside of the FreeRTOS kernel. !<<
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. Full license text is available from the following
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link: http://www.freertos.org/a00114.html
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong?" *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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license and Real Time Engineers Ltd. contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and middleware.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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1 tab == 4 spaces!
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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 SemaphoreHandle_t 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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