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145 lines
5.7 KiB
C
145 lines
5.7 KiB
C
/*
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FreeRTOS V7.5.3 - Copyright (C) 2013 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 distribute
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>>! a combined work that includes FreeRTOS without being obliged to provide
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>>! the source code for proprietary components outside of the FreeRTOS
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>>! 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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* Manages a queue of strings that are waiting to be displayed. This is used to
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* ensure mutual exclusion of console output.
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*
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* A task wishing to display a message will call vPrintDisplayMessage (), with a
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* pointer to the string as the parameter. The pointer is posted onto the
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* xPrintQueue queue.
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*
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* The task spawned in main. c blocks on xPrintQueue. When a message becomes
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* available it calls pcPrintGetNextMessage () to obtain a pointer to the next
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* string, then uses the functions defined in the portable layer FileIO. c to
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* display the message.
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*
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* <b>NOTE:</b>
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* Using console IO can disrupt real time performance - depending on the port.
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* Standard C IO routines are not designed for real time applications. While
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* standard IO is useful for demonstration and debugging an alternative method
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* should be used if you actually require console IO as part of your application.
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*
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* \page PrintC print.c
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* \ingroup DemoFiles
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* <HR>
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*/
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/*
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Changes from V2.0.0
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+ Delay periods are now specified using variables and constants of
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portTickType rather than unsigned long.
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*/
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#include <stdlib.h>
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "queue.h"
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/* Demo program include files. */
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#include "print.h"
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static xQueueHandle xPrintQueue;
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/*-----------------------------------------------------------*/
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void vPrintInitialise( void )
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{
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const unsigned portBASE_TYPE uxQueueSize = 20;
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/* Create the queue on which errors will be reported. */
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xPrintQueue = xQueueCreate( uxQueueSize, ( unsigned portBASE_TYPE ) sizeof( char * ) );
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}
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/*-----------------------------------------------------------*/
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void vPrintDisplayMessage( const char * const * ppcMessageToSend )
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{
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#ifdef USE_STDIO
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xQueueSend( xPrintQueue, ( void * ) ppcMessageToSend, ( portTickType ) 0 );
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#else
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/* Stop warnings. */
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( void ) ppcMessageToSend;
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#endif
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}
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/*-----------------------------------------------------------*/
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const char *pcPrintGetNextMessage( portTickType xPrintRate )
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{
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char *pcMessage;
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if( xQueueReceive( xPrintQueue, &pcMessage, xPrintRate ) == pdPASS )
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{
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return pcMessage;
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}
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else
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{
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return NULL;
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}
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}
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