2 FreeRTOS V7.3.0 - Copyright (C) 2012 Real Time Engineers Ltd.
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4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS tutorial books are available in pdf and paperback. *
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10 * Complete, revised, and edited pdf reference manuals are also *
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13 * Purchasing FreeRTOS documentation will not only help you, by *
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14 * ensuring you get running as quickly as possible and with an *
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15 * in-depth knowledge of how to use FreeRTOS, it will also help *
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16 * the FreeRTOS project to continue with its mission of providing *
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17 * professional grade, cross platform, de facto standard solutions *
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18 * for microcontrollers - completely free of charge! *
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20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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22 * Thank you for using FreeRTOS, and thank you for your support! *
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24 ***************************************************************************
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27 This file is part of the FreeRTOS distribution.
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29 FreeRTOS is free software; you can redistribute it and/or modify it under
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30 the terms of the GNU General Public License (version 2) as published by the
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31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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32 >>>NOTE<<< The modification to the GPL is included to allow you to
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33 distribute a combined work that includes FreeRTOS without being obliged to
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34 provide the source code for proprietary components outside of the FreeRTOS
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35 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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36 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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37 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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38 more details. You should have received a copy of the GNU General Public
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39 License and the FreeRTOS license exception along with FreeRTOS; if not it
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40 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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41 by writing to Richard Barry, contact details for whom are available on the
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46 ***************************************************************************
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48 * Having a problem? Start by reading the FAQ "My application does *
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49 * not run, what could be wrong?" *
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51 * http://www.FreeRTOS.org/FAQHelp.html *
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53 ***************************************************************************
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56 http://www.FreeRTOS.org - Documentation, training, latest versions, license
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57 and contact details.
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59 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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60 including FreeRTOS+Trace - an indispensable productivity tool.
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62 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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63 the code with commercial support, indemnification, and middleware, under
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64 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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65 provide a safety engineered and independently SIL3 certified version under
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66 the SafeRTOS brand: http://www.SafeRTOS.com.
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71 * This is a very simple queue test. See the BlockQ. c documentation for a more
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72 * comprehensive version.
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74 * Creates two tasks that communicate over a single queue. One task acts as a
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75 * producer, the other a consumer.
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77 * The producer loops for three iteration, posting an incrementing number onto the
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78 * queue each cycle. It then delays for a fixed period before doing exactly the
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81 * The consumer loops emptying the queue. Each item removed from the queue is
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82 * checked to ensure it contains the expected value. When the queue is empty it
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83 * blocks for a fixed period, then does the same again.
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85 * All queue access is performed without blocking. The consumer completely empties
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86 * the queue each time it runs so the producer should never find the queue full.
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88 * An error is flagged if the consumer obtains an unexpected value or the producer
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89 * find the queue is full.
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91 * \page PollQC pollQ.c
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92 * \ingroup DemoFiles
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99 + Delay periods are now specified using variables and constants of
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100 portTickType rather than unsigned long.
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103 #include <stdlib.h>
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105 /* Scheduler include files. */
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106 #include "FreeRTOS.h"
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111 /* Demo program include files. */
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114 #define pollqSTACK_SIZE ( ( unsigned short ) configMINIMAL_STACK_SIZE )
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116 /* The task that posts the incrementing number onto the queue. */
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117 static void vPolledQueueProducer( void *pvParameters );
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119 /* The task that empties the queue. */
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120 static void vPolledQueueConsumer( void *pvParameters );
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122 /* Variables that are used to check that the tasks are still running with no errors. */
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123 static volatile short sPollingConsumerCount = 0, sPollingProducerCount = 0;
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124 /*-----------------------------------------------------------*/
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126 void vStartPolledQueueTasks( unsigned portBASE_TYPE uxPriority )
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128 static xQueueHandle xPolledQueue;
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129 const unsigned portBASE_TYPE uxQueueSize = 10;
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131 /* Create the queue used by the producer and consumer. */
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132 xPolledQueue = xQueueCreate( uxQueueSize, ( unsigned portBASE_TYPE ) sizeof( unsigned short ) );
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134 /* Spawn the producer and consumer. */
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135 xTaskCreate( vPolledQueueConsumer, "QConsNB", pollqSTACK_SIZE, ( void * ) &xPolledQueue, uxPriority, NULL );
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136 xTaskCreate( vPolledQueueProducer, "QProdNB", pollqSTACK_SIZE, ( void * ) &xPolledQueue, uxPriority, NULL );
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138 /*-----------------------------------------------------------*/
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140 static void vPolledQueueProducer( void *pvParameters )
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142 unsigned short usValue = 0, usLoop;
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143 xQueueHandle *pxQueue;
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144 const portTickType xDelay = ( portTickType ) 200 / portTICK_RATE_MS;
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145 const unsigned short usNumToProduce = 3;
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146 const char * const pcTaskStartMsg = "Polled queue producer started.\r\n";
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147 const char * const pcTaskErrorMsg = "Could not post on polled queue.\r\n";
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148 short sError = pdFALSE;
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150 /* Queue a message for printing to say the task has started. */
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151 vPrintDisplayMessage( &pcTaskStartMsg );
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153 /* The queue being used is passed in as the parameter. */
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154 pxQueue = ( xQueueHandle * ) pvParameters;
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158 for( usLoop = 0; usLoop < usNumToProduce; ++usLoop )
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160 /* Send an incrementing number on the queue without blocking. */
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161 if( xQueueSendToBack( *pxQueue, ( void * ) &usValue, ( portTickType ) 0 ) != pdPASS )
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163 /* We should never find the queue full - this is an error. */
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164 vPrintDisplayMessage( &pcTaskErrorMsg );
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169 if( sError == pdFALSE )
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171 /* If an error has ever been recorded we stop incrementing the
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173 ++sPollingProducerCount;
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176 /* Update the value we are going to post next time around. */
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181 /* Wait before we start posting again to ensure the consumer runs and
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182 empties the queue. */
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183 vTaskDelay( xDelay );
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186 /*-----------------------------------------------------------*/
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188 static void vPolledQueueConsumer( void *pvParameters )
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190 unsigned short usData, usExpectedValue = 0;
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191 xQueueHandle *pxQueue;
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192 const portTickType xDelay = ( portTickType ) 200 / portTICK_RATE_MS;
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193 const char * const pcTaskStartMsg = "Polled queue consumer started.\r\n";
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194 const char * const pcTaskErrorMsg = "Incorrect value received on polled queue.\r\n";
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195 short sError = pdFALSE;
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197 /* Queue a message for printing to say the task has started. */
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198 vPrintDisplayMessage( &pcTaskStartMsg );
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200 /* The queue being used is passed in as the parameter. */
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201 pxQueue = ( xQueueHandle * ) pvParameters;
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205 /* Loop until the queue is empty. */
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206 while( uxQueueMessagesWaiting( *pxQueue ) )
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208 if( xQueueReceive( *pxQueue, &usData, ( portTickType ) 0 ) == pdPASS )
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210 if( usData != usExpectedValue )
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212 /* This is not what we expected to receive so an error has
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214 vPrintDisplayMessage( &pcTaskErrorMsg );
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216 /* Catch-up to the value we received so our next expected value
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217 should again be correct. */
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218 usExpectedValue = usData;
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222 if( sError == pdFALSE )
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224 /* Only increment the check variable if no errors have
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226 ++sPollingConsumerCount;
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233 /* Now the queue is empty we block, allowing the producer to place more
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234 items in the queue. */
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235 vTaskDelay( xDelay );
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238 /*-----------------------------------------------------------*/
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240 /* This is called to check that all the created tasks are still running with no errors. */
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241 portBASE_TYPE xArePollingQueuesStillRunning( void )
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243 static short sLastPollingConsumerCount = 0, sLastPollingProducerCount = 0;
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244 portBASE_TYPE xReturn;
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246 if( ( sLastPollingConsumerCount == sPollingConsumerCount ) ||
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247 ( sLastPollingProducerCount == sPollingProducerCount )
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257 sLastPollingConsumerCount = sPollingConsumerCount;
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258 sLastPollingProducerCount = sPollingProducerCount;
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