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FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd.
All rights reserved
* *
* FreeRTOS provides completely free yet professionally developed, *
* robust, strictly quality controlled, supported, and cross *
* platform software that has become a de facto standard. *
* *
* Help yourself get started quickly and support the FreeRTOS *
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This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
>>! NOTE: The modification to the GPL is included to allow you to !<<
>>! distribute a combined work that includes FreeRTOS without being !<<
>>! obliged to provide the source code for proprietary components !<<
>>! outside of the FreeRTOS kernel. !<<
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. Full license text is available from the following
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* *
* Having a problem? Start by reading the FAQ "My application does *
* not run, what could be wrong?" *
* *
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*************************************************************************** - Documentation, books, training, latest versions,
license and Real Time Engineers Ltd. contact details. - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool, a DOS
compatible FAT file system, and our tiny thread aware UDP/IP stack. - Real Time Engineers ltd license FreeRTOS to High
Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
licenses offer ticketed support, indemnification and middleware. - High Integrity Systems also provide a safety
engineered and independently SIL3 certified version for use in safety and
mission critical applications that require provable dependability.
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#include "FreeRTOS.h"
#include "semphr.h"
#define isrCLEAR_EINT_1 2
* Interrupt routine that simply wakes vButtonHandlerTask on each interrupt
* generated by a push of the built in button. The wrapper takes care of
* the ISR entry. This then calls the actual handler function to perform
* the work. This work should not be done in the wrapper itself unless
* you are absolutely sure that no stack space is used.
void vButtonISRWrapper( void ) __attribute__ ((naked));
void vButtonHandler( void ) __attribute__ ((noinline));
void vButtonHandler( void )
extern SemaphoreHandle_t xButtonSemaphore;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
xSemaphoreGiveFromISR( xButtonSemaphore, &xHigherPriorityTaskWoken );
if( xHigherPriorityTaskWoken )
/* We have woken a task. Calling "yield from ISR" here will ensure
the interrupt returns to the woken task if it has a priority higher
than the interrupted task. */
VICVectAddr = 0;
void vButtonISRWrapper( void )
/* Save the context of the interrupted task. */
/* Call the handler to do the work. This must be a separate function to
the wrapper to ensure the correct stack frame is set up. */
__asm volatile( "bl vButtonHandler" );
/* Restore the context of whichever task is going to run once the interrupt
completes. */