2 FreeRTOS V8.1.0 - 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 !<<
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28 >>! distribute a combined work that includes FreeRTOS without being !<<
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29 >>! obliged to provide the source code for proprietary components !<<
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30 >>! outside of the FreeRTOS kernel. !<<
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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 * Creates eight tasks, each of which flash an LED at a different rate. The first
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69 * LED flashes every 125ms, the second every 250ms, the third every 375ms, etc.
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71 * The LED flash tasks provide instant visual feedback. They show that the scheduler
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72 * is still operational.
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74 * The PC port uses the standard parallel port for outputs, the Flashlite 186 port
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77 * \page flashC flash.c
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78 * \ingroup DemoFiles
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85 + Delay periods are now specified using variables and constants of
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86 TickType_t rather than unsigned long.
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90 + The stack size now uses configMINIMAL_STACK_SIZE.
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91 + String constants made file scope to decrease stack depth on 8051 port.
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96 /* Scheduler include files. */
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97 #include "FreeRTOS.h"
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100 /* Demo program include files. */
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101 #include "partest.h"
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105 #define ledSTACK_SIZE configMINIMAL_STACK_SIZE
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107 /* Structure used to pass parameters to the LED tasks. */
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108 typedef struct LED_PARAMETERS
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110 unsigned portBASE_TYPE uxLED; /*< The output the task should use. */
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111 TickType_t xFlashRate; /*< The rate at which the LED should flash. */
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114 /* The task that is created eight times - each time with a different xLEDParaemtes
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115 structure passed in as the parameter. */
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116 static void vLEDFlashTask( void *pvParameters );
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118 /* String to print if USE_STDIO is defined. */
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119 const char * const pcTaskStartMsg = "LED flash task started.\r\n";
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121 /*-----------------------------------------------------------*/
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123 void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority )
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125 unsigned portBASE_TYPE uxLEDTask;
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126 xLEDParameters *pxLEDParameters;
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127 const unsigned portBASE_TYPE uxNumOfLEDs = 8;
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128 const TickType_t xFlashRate = 125;
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130 /* Create the eight tasks. */
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131 for( uxLEDTask = 0; uxLEDTask < uxNumOfLEDs; ++uxLEDTask )
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133 /* Create and complete the structure used to pass parameters to the next
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135 pxLEDParameters = ( xLEDParameters * ) pvPortMalloc( sizeof( xLEDParameters ) );
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136 pxLEDParameters->uxLED = uxLEDTask;
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137 pxLEDParameters->xFlashRate = ( xFlashRate + ( xFlashRate * ( TickType_t ) uxLEDTask ) );
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138 pxLEDParameters->xFlashRate /= portTICK_PERIOD_MS;
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140 /* Spawn the task. */
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141 xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, ( void * ) pxLEDParameters, uxPriority, ( TaskHandle_t * ) NULL );
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144 /*-----------------------------------------------------------*/
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146 static void vLEDFlashTask( void *pvParameters )
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148 xLEDParameters *pxParameters;
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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 pxParameters = ( xLEDParameters * ) pvParameters;
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157 /* Delay for half the flash period then turn the LED on. */
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158 vTaskDelay( pxParameters->xFlashRate / ( TickType_t ) 2 );
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159 vParTestToggleLED( pxParameters->uxLED );
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161 /* Delay for half the flash period then turn the LED off. */
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162 vTaskDelay( pxParameters->xFlashRate / ( TickType_t ) 2 );
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163 vParTestToggleLED( pxParameters->uxLED );
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