2 FreeRTOS V8.2.2 - Copyright (C) 2015 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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71 * This version of flash .c is for use on systems that have limited stack space
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72 * and no display facilities. The complete version can be found in the
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73 * Demo/Common/Full directory.
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75 * Three tasks are created, each of which flash an LED at a different rate. The first
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76 * LED flashes every 200ms, the second every 400ms, the third every 600ms.
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78 * The LED flash tasks provide instant visual feedback. They show that the scheduler
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79 * is still operational.
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86 /* Scheduler include files. */
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87 #include "FreeRTOS.h"
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90 /* Demo program include files. */
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91 #include "partest.h"
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94 #define ledSTACK_SIZE configMINIMAL_STACK_SIZE
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95 #define ledNUMBER_OF_LEDS ( 3 )
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96 #define ledFLASH_RATE_BASE ( ( TickType_t ) 333 )
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98 /* Variable used by the created tasks to calculate the LED number to use, and
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99 the rate at which they should flash the LED. */
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100 static volatile UBaseType_t uxFlashTaskNumber = 0;
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102 /* The task that is created three times. */
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103 static portTASK_FUNCTION_PROTO( vLEDFlashTask, pvParameters );
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105 /*-----------------------------------------------------------*/
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107 void vStartLEDFlashTasks( UBaseType_t uxPriority )
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109 BaseType_t xLEDTask;
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111 /* Create the three tasks. */
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112 for( xLEDTask = 0; xLEDTask < ledNUMBER_OF_LEDS; ++xLEDTask )
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114 /* Spawn the task. */
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115 xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t * ) NULL );
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118 /*-----------------------------------------------------------*/
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120 static portTASK_FUNCTION( vLEDFlashTask, pvParameters )
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122 TickType_t xFlashRate, xLastFlashTime;
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125 /* The parameters are not used. */
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126 ( void ) pvParameters;
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128 /* Calculate the LED and flash rate. */
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129 portENTER_CRITICAL();
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131 /* See which of the eight LED's we should use. */
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132 uxLED = uxFlashTaskNumber;
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134 /* Update so the next task uses the next LED. */
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135 uxFlashTaskNumber++;
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137 portEXIT_CRITICAL();
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139 xFlashRate = ledFLASH_RATE_BASE + ( ledFLASH_RATE_BASE * ( TickType_t ) uxLED );
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140 xFlashRate /= portTICK_PERIOD_MS;
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142 /* We will turn the LED on and off again in the delay period, so each
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143 delay is only half the total period. */
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144 xFlashRate /= ( TickType_t ) 2;
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146 /* We need to initialise xLastFlashTime prior to the first call to
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147 vTaskDelayUntil(). */
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148 xLastFlashTime = xTaskGetTickCount();
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152 /* Delay for half the flash period then turn the LED on. */
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153 vTaskDelayUntil( &xLastFlashTime, xFlashRate );
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154 vParTestToggleLED( uxLED );
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156 /* Delay for half the flash period then turn the LED off. */
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157 vTaskDelayUntil( &xLastFlashTime, xFlashRate );
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158 vParTestToggleLED( uxLED );
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160 } /*lint !e715 !e818 !e830 Function definition must be standard for task creation. */
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