2 FreeRTOS V8.0.0 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to distribute
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28 >>! a combined work that includes FreeRTOS without being obliged to provide
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29 >>! the source code for proprietary components outside of the FreeRTOS
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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68 * This is a very simple queue test. See the BlockQ. c documentation for a more
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69 * comprehensive version.
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71 * Creates two tasks that communicate over a single queue. One task acts as a
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72 * producer, the other a consumer.
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74 * The producer loops for three iteration, posting an incrementing number onto the
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75 * queue each cycle. It then delays for a fixed period before doing exactly the
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78 * The consumer loops emptying the queue. Each item removed from the queue is
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79 * checked to ensure it contains the expected value. When the queue is empty it
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80 * blocks for a fixed period, then does the same again.
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82 * All queue access is performed without blocking. The consumer completely empties
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83 * the queue each time it runs so the producer should never find the queue full.
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85 * An error is flagged if the consumer obtains an unexpected value or the producer
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86 * find the queue is full.
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88 * \page PollQC pollQ.c
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89 * \ingroup DemoFiles
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96 + Delay periods are now specified using variables and constants of
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97 TickType_t rather than unsigned long.
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100 #include <stdlib.h>
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102 /* Scheduler include files. */
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103 #include "FreeRTOS.h"
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108 /* Demo program include files. */
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111 #define pollqSTACK_SIZE ( ( unsigned short ) configMINIMAL_STACK_SIZE )
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113 /* The task that posts the incrementing number onto the queue. */
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114 static void vPolledQueueProducer( void *pvParameters );
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116 /* The task that empties the queue. */
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117 static void vPolledQueueConsumer( void *pvParameters );
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119 /* Variables that are used to check that the tasks are still running with no errors. */
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120 static volatile short sPollingConsumerCount = 0, sPollingProducerCount = 0;
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121 /*-----------------------------------------------------------*/
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123 void vStartPolledQueueTasks( unsigned portBASE_TYPE uxPriority )
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125 static QueueHandle_t xPolledQueue;
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126 const unsigned portBASE_TYPE uxQueueSize = 10;
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128 /* Create the queue used by the producer and consumer. */
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129 xPolledQueue = xQueueCreate( uxQueueSize, ( unsigned portBASE_TYPE ) sizeof( unsigned short ) );
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131 /* Spawn the producer and consumer. */
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132 xTaskCreate( vPolledQueueConsumer, "QConsNB", pollqSTACK_SIZE, ( void * ) &xPolledQueue, uxPriority, NULL );
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133 xTaskCreate( vPolledQueueProducer, "QProdNB", pollqSTACK_SIZE, ( void * ) &xPolledQueue, uxPriority, NULL );
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135 /*-----------------------------------------------------------*/
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137 static void vPolledQueueProducer( void *pvParameters )
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139 unsigned short usValue = 0, usLoop;
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140 QueueHandle_t *pxQueue;
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141 const TickType_t xDelay = ( TickType_t ) 200 / portTICK_PERIOD_MS;
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142 const unsigned short usNumToProduce = 3;
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143 const char * const pcTaskStartMsg = "Polled queue producer started.\r\n";
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144 const char * const pcTaskErrorMsg = "Could not post on polled queue.\r\n";
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145 short sError = pdFALSE;
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147 /* Queue a message for printing to say the task has started. */
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148 vPrintDisplayMessage( &pcTaskStartMsg );
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150 /* The queue being used is passed in as the parameter. */
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151 pxQueue = ( QueueHandle_t * ) pvParameters;
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155 for( usLoop = 0; usLoop < usNumToProduce; ++usLoop )
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157 /* Send an incrementing number on the queue without blocking. */
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158 if( xQueueSendToBack( *pxQueue, ( void * ) &usValue, ( TickType_t ) 0 ) != pdPASS )
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160 /* We should never find the queue full - this is an error. */
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161 vPrintDisplayMessage( &pcTaskErrorMsg );
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166 if( sError == pdFALSE )
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168 /* If an error has ever been recorded we stop incrementing the
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170 ++sPollingProducerCount;
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173 /* Update the value we are going to post next time around. */
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178 /* Wait before we start posting again to ensure the consumer runs and
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179 empties the queue. */
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180 vTaskDelay( xDelay );
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183 /*-----------------------------------------------------------*/
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185 static void vPolledQueueConsumer( void *pvParameters )
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187 unsigned short usData, usExpectedValue = 0;
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188 QueueHandle_t *pxQueue;
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189 const TickType_t xDelay = ( TickType_t ) 200 / portTICK_PERIOD_MS;
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190 const char * const pcTaskStartMsg = "Polled queue consumer started.\r\n";
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191 const char * const pcTaskErrorMsg = "Incorrect value received on polled queue.\r\n";
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192 short sError = pdFALSE;
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194 /* Queue a message for printing to say the task has started. */
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195 vPrintDisplayMessage( &pcTaskStartMsg );
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197 /* The queue being used is passed in as the parameter. */
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198 pxQueue = ( QueueHandle_t * ) pvParameters;
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202 /* Loop until the queue is empty. */
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203 while( uxQueueMessagesWaiting( *pxQueue ) )
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205 if( xQueueReceive( *pxQueue, &usData, ( TickType_t ) 0 ) == pdPASS )
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207 if( usData != usExpectedValue )
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209 /* This is not what we expected to receive so an error has
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211 vPrintDisplayMessage( &pcTaskErrorMsg );
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213 /* Catch-up to the value we received so our next expected value
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214 should again be correct. */
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215 usExpectedValue = usData;
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219 if( sError == pdFALSE )
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221 /* Only increment the check variable if no errors have
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223 ++sPollingConsumerCount;
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230 /* Now the queue is empty we block, allowing the producer to place more
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231 items in the queue. */
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232 vTaskDelay( xDelay );
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235 /*-----------------------------------------------------------*/
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237 /* This is called to check that all the created tasks are still running with no errors. */
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238 portBASE_TYPE xArePollingQueuesStillRunning( void )
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240 static short sLastPollingConsumerCount = 0, sLastPollingProducerCount = 0;
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241 portBASE_TYPE xReturn;
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243 if( ( sLastPollingConsumerCount == sPollingConsumerCount ) ||
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244 ( sLastPollingProducerCount == sPollingProducerCount )
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254 sLastPollingConsumerCount = sPollingConsumerCount;
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255 sLastPollingProducerCount = sPollingProducerCount;
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