2 FreeRTOS V9.0.0 - Copyright (C) 2016 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 ***************************************************************************
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14 >>! NOTE: The modification to the GPL is included to allow you to !<<
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15 >>! distribute a combined work that includes FreeRTOS without being !<<
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16 >>! obliged to provide the source code for proprietary components !<<
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17 >>! outside of the FreeRTOS kernel. !<<
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18 ***************************************************************************
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20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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21 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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22 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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23 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * FreeRTOS provides completely free yet professionally developed, *
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28 * robust, strictly quality controlled, supported, and cross *
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29 * platform software that is more than just the market leader, it *
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30 * is the industry's de facto standard. *
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32 * Help yourself get started quickly while simultaneously helping *
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33 * to support the FreeRTOS project by purchasing a FreeRTOS *
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34 * tutorial book, reference manual, or both: *
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35 * http://www.FreeRTOS.org/Documentation *
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37 ***************************************************************************
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39 http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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40 the FAQ page "My application does not run, what could be wrong?". Have you
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41 defined configASSERT()?
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43 http://www.FreeRTOS.org/support - In return for receiving this top quality
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44 embedded software for free we request you assist our global community by
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45 participating in the support forum.
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47 http://www.FreeRTOS.org/training - Investing in training allows your team to
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48 be as productive as possible as early as possible. Now you can receive
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49 FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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50 Ltd, and the world's leading authority on the world's leading RTOS.
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52 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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53 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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54 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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56 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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57 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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59 http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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60 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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61 licenses offer ticketed support, indemnification and commercial middleware.
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63 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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64 engineered and independently SIL3 certified version for use in safety and
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65 mission critical applications that require provable dependability.
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72 * Creates eight tasks, each of which flash an LED at a different rate. The first
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73 * LED flashes every 125ms, the second every 250ms, the third every 375ms, etc.
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75 * The LED flash tasks provide instant visual feedback. They show that the scheduler
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76 * is still operational.
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78 * The PC port uses the standard parallel port for outputs, the Flashlite 186 port
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81 * \page flashC flash.c
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82 * \ingroup DemoFiles
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89 + Delay periods are now specified using variables and constants of
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90 TickType_t rather than unsigned long.
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94 + The stack size now uses configMINIMAL_STACK_SIZE.
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95 + String constants made file scope to decrease stack depth on 8051 port.
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100 /* Scheduler include files. */
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101 #include "FreeRTOS.h"
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104 /* Demo program include files. */
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105 #include "partest.h"
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109 #define ledSTACK_SIZE configMINIMAL_STACK_SIZE
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111 /* Structure used to pass parameters to the LED tasks. */
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112 typedef struct LED_PARAMETERS
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114 unsigned portBASE_TYPE uxLED; /*< The output the task should use. */
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115 TickType_t xFlashRate; /*< The rate at which the LED should flash. */
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118 /* The task that is created eight times - each time with a different xLEDParaemtes
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119 structure passed in as the parameter. */
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120 static void vLEDFlashTask( void *pvParameters );
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122 /* String to print if USE_STDIO is defined. */
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123 const char * const pcTaskStartMsg = "LED flash task started.\r\n";
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125 /*-----------------------------------------------------------*/
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127 void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority )
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129 unsigned portBASE_TYPE uxLEDTask;
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130 xLEDParameters *pxLEDParameters;
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131 const unsigned portBASE_TYPE uxNumOfLEDs = 8;
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132 const TickType_t xFlashRate = 125;
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134 /* Create the eight tasks. */
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135 for( uxLEDTask = 0; uxLEDTask < uxNumOfLEDs; ++uxLEDTask )
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137 /* Create and complete the structure used to pass parameters to the next
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139 pxLEDParameters = ( xLEDParameters * ) pvPortMalloc( sizeof( xLEDParameters ) );
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140 pxLEDParameters->uxLED = uxLEDTask;
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141 pxLEDParameters->xFlashRate = ( xFlashRate + ( xFlashRate * ( TickType_t ) uxLEDTask ) );
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142 pxLEDParameters->xFlashRate /= portTICK_PERIOD_MS;
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144 /* Spawn the task. */
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145 xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, ( void * ) pxLEDParameters, uxPriority, ( TaskHandle_t * ) NULL );
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148 /*-----------------------------------------------------------*/
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150 static void vLEDFlashTask( void *pvParameters )
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152 xLEDParameters *pxParameters;
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154 /* Queue a message for printing to say the task has started. */
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155 vPrintDisplayMessage( &pcTaskStartMsg );
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157 pxParameters = ( xLEDParameters * ) pvParameters;
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161 /* Delay for half the flash period then turn the LED on. */
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162 vTaskDelay( pxParameters->xFlashRate / ( TickType_t ) 2 );
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163 vParTestToggleLED( pxParameters->uxLED );
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165 /* Delay for half the flash period then turn the LED off. */
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166 vTaskDelay( pxParameters->xFlashRate / ( TickType_t ) 2 );
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167 vParTestToggleLED( pxParameters->uxLED );
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