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136 lines
6.1 KiB
C
136 lines
6.1 KiB
C
/*
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FreeRTOS V8.0.1 - 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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/*
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* This file defines the button push task and ISR as described at the top of
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* main.c. The ISR is called from a wrapper function defined in ButtonISR.s26.
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*/
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/* Kernel includes. */
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#include "FreeRTOS.h"
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#include "task.h"
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#include "semphr.h"
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/* The LED output used by the button push task. */
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#define butLED1 P7_bit.no7
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/* A short delay used for button debouncing. */
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#define butDEBOUNCE_DELAY ( 200 / portTICK_PERIOD_MS )
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/* The semaphore used to synchronise the button push task with the interrupt. */
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static SemaphoreHandle_t xButtonSemaphore;
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/*
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* The definition of the button task itself. See the comments at the top of
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* main.c.
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*/
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void vButtonTask( void *pvParameters )
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{
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/* Ensure the semaphore is created before it gets used. */
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vSemaphoreCreateBinary( xButtonSemaphore );
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for( ;; )
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{
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/* Block on the semaphore to wait for an interrupt event. The semaphore
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is 'given' from vButtonISRHandler() below. Using portMAX_DELAY as the
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block time will cause the task to block indefinitely provided
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INCLUDE_vTaskSuspend is set to 1 in FreeRTOSConfig.h. */
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xSemaphoreTake( xButtonSemaphore, portMAX_DELAY );
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/* The button must have been pushed for this line to be executed.
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Simply toggle the LED. */
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butLED1 = !butLED1;
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/* Wait a short time then clear any pending button pushes as a crude
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method of debouncing the switch. xSemaphoreTake() uses a block time of
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zero this time so it returns immediately rather than waiting for the
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interrupt to occur. */
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vTaskDelay( butDEBOUNCE_DELAY );
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xSemaphoreTake( xButtonSemaphore, 0 );
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}
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}
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/*-----------------------------------------------------------*/
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/*
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* The C portion of the interrupt handler. Interrupts are triggered by pushing
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* the button on the target board. This interrupt can cause a context switch
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* so has an assembly file wrapper defined within ButtonISR.s26.
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*/
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void vButtonISRHandler( void )
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{
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short sHigherPriorityTaskWoken = pdFALSE;
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/* 'Give' the semaphore to unblock the button task. */
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xSemaphoreGiveFromISR( xButtonSemaphore, &sHigherPriorityTaskWoken );
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/* If giving the semaphore unblocked a task, and the unblocked task has a
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priority that is higher than the currently running task, then
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sHigherPriorityTaskWoken will have been set to pdTRUE. Passing a pdTRUE
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value to portYIELD_FROM_ISR() will cause this interrupt to return directly
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to the higher priority unblocked task. */
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portYIELD_FROM_ISR( sHigherPriorityTaskWoken );
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}
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/*-----------------------------------------------------------*/
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