/* | |
FreeRTOS V5.4.2 - Copyright (C) 2009 Real Time Engineers Ltd. | |
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 exception 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. | |
Alternative commercial license and support terms are also available upon | |
request. See the licensing section of http://www.FreeRTOS.org for full | |
license details. | |
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. See the GNU General Public License for | |
more details. | |
You should have received a copy of the GNU General Public License along | |
with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59 | |
Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
*************************************************************************** | |
* * | |
* Looking for a quick start? Then check out the FreeRTOS eBook! * | |
* See http://www.FreeRTOS.org/Documentation for details * | |
* * | |
*************************************************************************** | |
1 tab == 4 spaces! | |
Please ensure to read the configuration and relevant port sections of the | |
online documentation. | |
http://www.FreeRTOS.org - Documentation, latest information, license and | |
contact details. | |
http://www.SafeRTOS.com - A version that is certified for use in safety | |
critical systems. | |
http://www.OpenRTOS.com - Commercial support, development, porting, | |
licensing and training services. | |
*/ | |
#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 xSemaphoreHandle 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. */ | |
portYIELD_FROM_ISR(); | |
} | |
EXTINT = isrCLEAR_EINT_1; | |
VICVectAddr = 0; | |
} | |
/*-----------------------------------------------------------*/ | |
void vButtonISRWrapper( void ) | |
{ | |
/* Save the context of the interrupted task. */ | |
portSAVE_CONTEXT(); | |
/* 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. */ | |
portRESTORE_CONTEXT(); | |
} | |