2 FreeRTOS V7.5.1 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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6 ***************************************************************************
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8 * FreeRTOS provides completely free yet professionally developed, *
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9 * robust, strictly quality controlled, supported, and cross *
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10 * platform software that has become a de facto standard. *
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12 * Help yourself get started quickly and support the FreeRTOS *
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13 * project by purchasing a FreeRTOS tutorial book, reference *
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14 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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18 ***************************************************************************
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20 This file is part of the FreeRTOS distribution.
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22 FreeRTOS is free software; you can redistribute it and/or modify it under
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23 the terms of the GNU General Public License (version 2) as published by the
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24 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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26 >>! NOTE: The modification to the GPL is included to allow you to distribute
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27 >>! a combined work that includes FreeRTOS without being obliged to provide
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28 >>! the source code for proprietary components outside of the FreeRTOS
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31 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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32 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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33 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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34 link: http://www.freertos.org/a00114.html
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38 ***************************************************************************
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40 * Having a problem? Start by reading the FAQ "My application does *
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41 * not run, what could be wrong?" *
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43 * http://www.FreeRTOS.org/FAQHelp.html *
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45 ***************************************************************************
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47 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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48 license and Real Time Engineers Ltd. contact details.
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50 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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51 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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52 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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54 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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55 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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56 licenses offer ticketed support, indemnification and middleware.
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58 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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59 engineered and independently SIL3 certified version for use in safety and
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60 mission critical applications that require provable dependability.
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67 * Creates eight tasks, each of which flash an LED at a different rate. The first
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68 * LED flashes every 125ms, the second every 250ms, the third every 375ms, etc.
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70 * The LED flash tasks provide instant visual feedback. They show that the scheduler
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71 * is still operational.
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73 * The PC port uses the standard parallel port for outputs, the Flashlite 186 port
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76 * \page flashC flash.c
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77 * \ingroup DemoFiles
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84 + Delay periods are now specified using variables and constants of
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85 portTickType rather than unsigned long.
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89 + The stack size now uses configMINIMAL_STACK_SIZE.
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90 + String constants made file scope to decrease stack depth on 8051 port.
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95 /* Scheduler include files. */
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96 #include "FreeRTOS.h"
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99 /* Demo program include files. */
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100 #include "partest.h"
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104 #define ledSTACK_SIZE configMINIMAL_STACK_SIZE
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106 /* Structure used to pass parameters to the LED tasks. */
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107 typedef struct LED_PARAMETERS
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109 unsigned portBASE_TYPE uxLED; /*< The output the task should use. */
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110 portTickType xFlashRate; /*< The rate at which the LED should flash. */
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113 /* The task that is created eight times - each time with a different xLEDParaemtes
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114 structure passed in as the parameter. */
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115 static void vLEDFlashTask( void *pvParameters );
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117 /* String to print if USE_STDIO is defined. */
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118 const char * const pcTaskStartMsg = "LED flash task started.\r\n";
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120 /*-----------------------------------------------------------*/
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122 void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority )
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124 unsigned portBASE_TYPE uxLEDTask;
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125 xLEDParameters *pxLEDParameters;
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126 const unsigned portBASE_TYPE uxNumOfLEDs = 8;
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127 const portTickType xFlashRate = 125;
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129 /* Create the eight tasks. */
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130 for( uxLEDTask = 0; uxLEDTask < uxNumOfLEDs; ++uxLEDTask )
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132 /* Create and complete the structure used to pass parameters to the next
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134 pxLEDParameters = ( xLEDParameters * ) pvPortMalloc( sizeof( xLEDParameters ) );
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135 pxLEDParameters->uxLED = uxLEDTask;
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136 pxLEDParameters->xFlashRate = ( xFlashRate + ( xFlashRate * ( portTickType ) uxLEDTask ) );
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137 pxLEDParameters->xFlashRate /= portTICK_RATE_MS;
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139 /* Spawn the task. */
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140 xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, ( void * ) pxLEDParameters, uxPriority, ( xTaskHandle * ) NULL );
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143 /*-----------------------------------------------------------*/
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145 static void vLEDFlashTask( void *pvParameters )
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147 xLEDParameters *pxParameters;
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149 /* Queue a message for printing to say the task has started. */
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150 vPrintDisplayMessage( &pcTaskStartMsg );
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152 pxParameters = ( xLEDParameters * ) pvParameters;
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156 /* Delay for half the flash period then turn the LED on. */
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157 vTaskDelay( pxParameters->xFlashRate / ( portTickType ) 2 );
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158 vParTestToggleLED( pxParameters->uxLED );
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160 /* Delay for half the flash period then turn the LED off. */
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161 vTaskDelay( pxParameters->xFlashRate / ( portTickType ) 2 );
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162 vParTestToggleLED( pxParameters->uxLED );
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