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112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/*
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FreeRTOS.org V4.1.1 - Copyright (C) 2003-2006 Richard Barry.
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This file is part of the FreeRTOS.org distribution.
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FreeRTOS.org is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FreeRTOS.org is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FreeRTOS.org; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A special exception to the GPL can be applied should you wish to distribute
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a combined work that includes FreeRTOS.org, without being obliged to provide
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the source code for any proprietary components. See the licensing section
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of http://www.FreeRTOS.org for full details of how and when the exception
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can be applied.
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***************************************************************************
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See http://www.FreeRTOS.org for documentation, latest information, license
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and contact details. Please ensure to read the configuration and relevant
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port sections of the online documentation.
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***************************************************************************
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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 portLONG.
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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( portCHAR * ) );
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}
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/*-----------------------------------------------------------*/
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void vPrintDisplayMessage( const portCHAR * 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 portCHAR *pcPrintGetNextMessage( portTickType xPrintRate )
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{
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portCHAR *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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