2 FreeRTOS V8.2.0rc1 - 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 This file is part of the FreeRTOS distribution.
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9 FreeRTOS is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License (version 2) as published by the
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11 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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13 >>! NOTE: The modification to the GPL is included to allow you to !<<
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14 >>! distribute a combined work that includes FreeRTOS without being !<<
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15 >>! obliged to provide the source code for proprietary components !<<
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16 >>! outside of the FreeRTOS kernel. !<<
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18 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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19 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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20 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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21 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * Having a problem? Start by reading the FAQ "My application does *
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28 * not run, what could be wrong?". Have you defined configASSERT()? *
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30 * http://www.FreeRTOS.org/FAQHelp.html *
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32 ***************************************************************************
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34 ***************************************************************************
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36 * FreeRTOS provides completely free yet professionally developed, *
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37 * robust, strictly quality controlled, supported, and cross *
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38 * platform software that is more than just the market leader, it *
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39 * is the industry's de facto standard. *
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41 * Help yourself get started quickly while simultaneously helping *
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42 * to support the FreeRTOS project by purchasing a FreeRTOS *
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43 * tutorial book, reference manual, or both: *
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44 * http://www.FreeRTOS.org/Documentation *
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46 ***************************************************************************
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48 ***************************************************************************
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50 * Investing in training allows your team to be as productive as *
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51 * possible as early as possible, lowering your overall development *
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52 * cost, and enabling you to bring a more robust product to market *
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53 * earlier than would otherwise be possible. Richard Barry is both *
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54 * the architect and key author of FreeRTOS, and so also the world's *
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55 * leading authority on what is the world's most popular real time *
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56 * kernel for deeply embedded MCU designs. Obtaining your training *
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57 * from Richard ensures your team will gain directly from his in-depth *
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58 * product knowledge and years of usage experience. Contact Real Time *
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59 * Engineers Ltd to enquire about the FreeRTOS Masterclass, presented *
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60 * by Richard Barry: http://www.FreeRTOS.org/contact
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62 ***************************************************************************
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64 ***************************************************************************
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66 * You are receiving this top quality software for free. Please play *
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67 * fair and reciprocate by reporting any suspected issues and *
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68 * participating in the community forum: *
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69 * http://www.FreeRTOS.org/support *
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73 ***************************************************************************
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75 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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76 license and Real Time Engineers Ltd. contact details.
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78 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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79 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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80 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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82 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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83 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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85 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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86 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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87 licenses offer ticketed support, indemnification and commercial middleware.
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89 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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90 engineered and independently SIL3 certified version for use in safety and
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91 mission critical applications that require provable dependability.
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97 * This version of flash .c is for use on systems that have limited stack space
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98 * and no display facilities. The complete version can be found in the
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99 * Demo/Common/Full directory.
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101 * Three tasks are created, each of which flash an LED at a different rate. The first
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102 * LED flashes every 200ms, the second every 400ms, the third every 600ms.
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104 * The LED flash tasks provide instant visual feedback. They show that the scheduler
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105 * is still operational.
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110 #include <stdlib.h>
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112 /* Scheduler include files. */
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113 #include "FreeRTOS.h"
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116 /* Demo program include files. */
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117 #include "partest.h"
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120 #define ledSTACK_SIZE configMINIMAL_STACK_SIZE
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121 #define ledNUMBER_OF_LEDS ( 3 )
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122 #define ledFLASH_RATE_BASE ( ( TickType_t ) 333 )
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124 /* Variable used by the created tasks to calculate the LED number to use, and
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125 the rate at which they should flash the LED. */
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126 static volatile UBaseType_t uxFlashTaskNumber = 0;
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128 /* The task that is created three times. */
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129 static portTASK_FUNCTION_PROTO( vLEDFlashTask, pvParameters );
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131 /*-----------------------------------------------------------*/
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133 void vStartLEDFlashTasks( UBaseType_t uxPriority )
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135 BaseType_t xLEDTask;
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137 /* Create the three tasks. */
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138 for( xLEDTask = 0; xLEDTask < ledNUMBER_OF_LEDS; ++xLEDTask )
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140 /* Spawn the task. */
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141 xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t * ) NULL );
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144 /*-----------------------------------------------------------*/
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146 static portTASK_FUNCTION( vLEDFlashTask, pvParameters )
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148 TickType_t xFlashRate, xLastFlashTime;
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151 /* The parameters are not used. */
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152 ( void ) pvParameters;
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154 /* Calculate the LED and flash rate. */
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155 portENTER_CRITICAL();
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157 /* See which of the eight LED's we should use. */
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158 uxLED = uxFlashTaskNumber;
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160 /* Update so the next task uses the next LED. */
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161 uxFlashTaskNumber++;
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163 portEXIT_CRITICAL();
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165 xFlashRate = ledFLASH_RATE_BASE + ( ledFLASH_RATE_BASE * ( TickType_t ) uxLED );
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166 xFlashRate /= portTICK_PERIOD_MS;
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168 /* We will turn the LED on and off again in the delay period, so each
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169 delay is only half the total period. */
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170 xFlashRate /= ( TickType_t ) 2;
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172 /* We need to initialise xLastFlashTime prior to the first call to
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173 vTaskDelayUntil(). */
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174 xLastFlashTime = xTaskGetTickCount();
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178 /* Delay for half the flash period then turn the LED on. */
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179 vTaskDelayUntil( &xLastFlashTime, xFlashRate );
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180 vParTestToggleLED( uxLED );
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182 /* Delay for half the flash period then turn the LED off. */
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183 vTaskDelayUntil( &xLastFlashTime, xFlashRate );
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184 vParTestToggleLED( uxLED );
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186 } /*lint !e715 !e818 !e830 Function definition must be standard for task creation. */
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