/* | |
FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd. | |
*************************************************************************** | |
* * | |
* FreeRTOS tutorial books are available in pdf and paperback. * | |
* Complete, revised, and edited pdf reference manuals are also * | |
* available. * | |
* * | |
* Purchasing FreeRTOS documentation will not only help you, by * | |
* ensuring you get running as quickly as possible and with an * | |
* in-depth knowledge of how to use FreeRTOS, it will also help * | |
* the FreeRTOS project to continue with its mission of providing * | |
* professional grade, cross platform, de facto standard solutions * | |
* for microcontrollers - completely free of charge! * | |
* * | |
* >>> See http://www.FreeRTOS.org/Documentation for details. <<< * | |
* * | |
* Thank you for using FreeRTOS, and thank you for your support! * | |
* * | |
*************************************************************************** | |
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. See the GNU General Public License for | |
more details. You should have received a copy of the GNU General Public | |
License and the FreeRTOS license exception along with FreeRTOS; if not it | |
can be viewed here: http://www.freertos.org/a00114.html and also obtained | |
by writing to Richard Barry, contact details for whom are available on the | |
FreeRTOS WEB site. | |
1 tab == 4 spaces! | |
*************************************************************************** | |
* * | |
* Having a problem? Start by reading the FAQ "My application does * | |
* not run, what could be wrong? * | |
* * | |
* http://www.FreeRTOS.org/FAQHelp.html * | |
* * | |
*************************************************************************** | |
http://www.FreeRTOS.org - Documentation, training, latest information, | |
license and contact details. | |
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, | |
including FreeRTOS+Trace - an indispensable productivity tool. | |
Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell | |
the code with commercial support, indemnification, and middleware, under | |
the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also | |
provide a safety engineered and independently SIL3 certified version under | |
the SafeRTOS brand: http://www.SafeRTOS.com. | |
*/ | |
#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(); | |
} | |