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149 lines
6.0 KiB
C
149 lines
6.0 KiB
C
/*
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FreeRTOS V8.2.1 - Copyright (C) 2015 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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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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***************************************************************************
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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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***************************************************************************
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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 on the following
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link: http://www.freertos.org/a00114.html
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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 is more than just the market leader, it *
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* is the industry's de facto standard. *
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* *
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* Help yourself get started quickly while simultaneously helping *
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* to support the FreeRTOS project by purchasing a FreeRTOS *
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* tutorial book, reference manual, or both: *
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* http://www.FreeRTOS.org/Documentation *
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* *
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***************************************************************************
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http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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the FAQ page "My application does not run, what could be wrong?". Have you
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defined configASSERT()?
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http://www.FreeRTOS.org/support - In return for receiving this top quality
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embedded software for free we request you assist our global community by
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participating in the support forum.
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http://www.FreeRTOS.org/training - Investing in training allows your team to
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be as productive as possible as early as possible. Now you can receive
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FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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Ltd, and the world's leading authority on the world's leading RTOS.
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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.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and commercial 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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TickType_t 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 QueueHandle_t 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, ( TickType_t ) 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( TickType_t 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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