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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [Full/] [flash.c] - Blame information for rev 609

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1 606 jeremybenn
/*
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    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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    ***************************************************************************
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    *                                                                         *
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    * If you are:                                                             *
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    *                                                                         *
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    *    + New to FreeRTOS,                                                   *
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    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *
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    *    + Looking for basic training,                                        *
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    *    + Wanting to improve your FreeRTOS skills and productivity           *
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    *                                                                         *
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    * then take a look at the FreeRTOS books - available as PDF or paperback  *
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    *                                                                         *
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    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
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    *                  http://www.FreeRTOS.org/Documentation                  *
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    *                                                                         *
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    * A pdf reference manual is also available.  Both are usually delivered   *
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    * to your inbox within 20 minutes to two hours when purchased between 8am *
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    * and 8pm GMT (although please allow up to 24 hours in case of            *
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    * exceptional circumstances).  Thank you for your support!                *
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    *                                                                         *
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    ***************************************************************************
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    This file is part of the FreeRTOS distribution.
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    FreeRTOS is free software; you can redistribute it and/or modify it under
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    the terms of the GNU General Public License (version 2) as published by the
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    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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    ***NOTE*** The exception to the GPL is included to allow you to distribute
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    a combined work that includes FreeRTOS without being obliged to provide the
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    source code for proprietary components outside of the FreeRTOS kernel.
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    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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    more details. You should have received a copy of the GNU General Public
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    License and the FreeRTOS license exception along with FreeRTOS; if not it
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    can be viewed here: http://www.freertos.org/a00114.html and also obtained
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    by writing to Richard Barry, contact details for whom are available on the
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    FreeRTOS WEB site.
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    1 tab == 4 spaces!
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    http://www.FreeRTOS.org - Documentation, latest information, license and
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    contact details.
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    http://www.SafeRTOS.com - A version that is certified for use in safety
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    critical systems.
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    http://www.OpenRTOS.com - Commercial support, development, porting,
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    licensing and training services.
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*/
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/**
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 * Creates eight tasks, each of which flash an LED at a different rate.  The first
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 * LED flashes every 125ms, the second every 250ms, the third every 375ms, etc.
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 *
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 * The LED flash tasks provide instant visual feedback.  They show that the scheduler
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 * is still operational.
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 *
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 * The PC port uses the standard parallel port for outputs, the Flashlite 186 port
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 * uses IO port F.
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 *
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 * \page flashC flash.c
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 * \ingroup DemoFiles
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 * <HR>
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 */
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/*
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Changes from V2.0.0
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        + Delay periods are now specified using variables and constants of
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          portTickType rather than unsigned long.
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Changes from V2.1.1
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        + The stack size now uses configMINIMAL_STACK_SIZE.
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        + String constants made file scope to decrease stack depth on 8051 port.
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*/
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#include <stdlib.h>
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "task.h"
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/* Demo program include files. */
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#include "partest.h"
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#include "flash.h"
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#include "print.h"
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#define ledSTACK_SIZE           configMINIMAL_STACK_SIZE
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/* Structure used to pass parameters to the LED tasks. */
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typedef struct LED_PARAMETERS
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{
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        unsigned portBASE_TYPE uxLED;           /*< The output the task should use. */
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        portTickType xFlashRate;        /*< The rate at which the LED should flash. */
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} xLEDParameters;
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/* The task that is created eight times - each time with a different xLEDParaemtes
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structure passed in as the parameter. */
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static void vLEDFlashTask( void *pvParameters );
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/* String to print if USE_STDIO is defined. */
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const char * const pcTaskStartMsg = "LED flash task started.\r\n";
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/*-----------------------------------------------------------*/
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void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority )
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{
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unsigned portBASE_TYPE uxLEDTask;
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xLEDParameters *pxLEDParameters;
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const unsigned portBASE_TYPE uxNumOfLEDs = 8;
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const portTickType xFlashRate = 125;
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        /* Create the eight tasks. */
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        for( uxLEDTask = 0; uxLEDTask < uxNumOfLEDs; ++uxLEDTask )
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        {
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                /* Create and complete the structure used to pass parameters to the next
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                created task. */
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                pxLEDParameters = ( xLEDParameters * ) pvPortMalloc( sizeof( xLEDParameters ) );
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                pxLEDParameters->uxLED = uxLEDTask;
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                pxLEDParameters->xFlashRate = ( xFlashRate + ( xFlashRate * ( portTickType ) uxLEDTask ) );
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                pxLEDParameters->xFlashRate /= portTICK_RATE_MS;
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                /* Spawn the task. */
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                xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, ( void * ) pxLEDParameters, uxPriority, ( xTaskHandle * ) NULL );
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        }
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}
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/*-----------------------------------------------------------*/
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static void vLEDFlashTask( void *pvParameters )
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{
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xLEDParameters *pxParameters;
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        /* Queue a message for printing to say the task has started. */
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        vPrintDisplayMessage( &pcTaskStartMsg );
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        pxParameters = ( xLEDParameters * ) pvParameters;
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        for(;;)
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        {
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                /* Delay for half the flash period then turn the LED on. */
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                vTaskDelay( pxParameters->xFlashRate / ( portTickType ) 2 );
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                vParTestToggleLED( pxParameters->uxLED );
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                /* Delay for half the flash period then turn the LED off. */
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                vTaskDelay( pxParameters->xFlashRate / ( portTickType ) 2 );
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                vParTestToggleLED( pxParameters->uxLED );
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        }
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}
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