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/*
* FreeRTOS Kernel V10.3.0
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* http://www.FreeRTOS.org
* http://aws.amazon.com/freertos
*
* 1 tab == 4 spaces!
*/
#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. */
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();
}
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