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/*
* FreeRTOS V202104.00
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* http://www.FreeRTOS.org
* http://aws.amazon.com/freertos
*
* 1 tab == 4 spaces!
*/
/**
* Creates eight tasks, each of which flash an LED at a different rate. The first
* LED flashes every 125ms, the second every 250ms, the third every 375ms, etc.
*
* The LED flash tasks provide instant visual feedback. They show that the scheduler
* is still operational.
*
* The PC port uses the standard parallel port for outputs, the Flashlite 186 port
* uses IO port F.
*
* \page flashC flash.c
* \ingroup DemoFiles
* <HR>
*/
/*
* Changes from V2.0.0
*
+ Delay periods are now specified using variables and constants of
+ TickType_t rather than unsigned long.
+
+ Changes from V2.1.1
+
+ The stack size now uses configMINIMAL_STACK_SIZE.
+ String constants made file scope to decrease stack depth on 8051 port.
*/
#include <stdlib.h>
/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
/* Demo program include files. */
#include "partest.h"
#include "flash.h"
#include "print.h"
#define ledSTACK_SIZE configMINIMAL_STACK_SIZE
/* Structure used to pass parameters to the LED tasks. */
typedef struct LED_PARAMETERS
{
unsigned portBASE_TYPE uxLED; /*< The output the task should use. */
TickType_t xFlashRate; /*< The rate at which the LED should flash. */
} xLEDParameters;
/* The task that is created eight times - each time with a different xLEDParaemtes
* structure passed in as the parameter. */
static void vLEDFlashTask( void * pvParameters );
/* String to print if USE_STDIO is defined. */
const char * const pcTaskStartMsg = "LED flash task started.\r\n";
/*-----------------------------------------------------------*/
void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority )
{
unsigned portBASE_TYPE uxLEDTask;
xLEDParameters * pxLEDParameters;
const unsigned portBASE_TYPE uxNumOfLEDs = 8;
const TickType_t xFlashRate = 125;
/* Create the eight tasks. */
for( uxLEDTask = 0; uxLEDTask < uxNumOfLEDs; ++uxLEDTask )
{
/* Create and complete the structure used to pass parameters to the next
* created task. */
pxLEDParameters = ( xLEDParameters * ) pvPortMalloc( sizeof( xLEDParameters ) );
pxLEDParameters->uxLED = uxLEDTask;
pxLEDParameters->xFlashRate = ( xFlashRate + ( xFlashRate * ( TickType_t ) uxLEDTask ) );
pxLEDParameters->xFlashRate /= portTICK_PERIOD_MS;
/* Spawn the task. */
xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, ( void * ) pxLEDParameters, uxPriority, ( TaskHandle_t * ) NULL );
}
}
/*-----------------------------------------------------------*/
static void vLEDFlashTask( void * pvParameters )
{
xLEDParameters * pxParameters;
/* Queue a message for printing to say the task has started. */
vPrintDisplayMessage( &pcTaskStartMsg );
pxParameters = ( xLEDParameters * ) pvParameters;
for( ; ; )
{
/* Delay for half the flash period then turn the LED on. */
vTaskDelay( pxParameters->xFlashRate / ( TickType_t ) 2 );
vParTestToggleLED( pxParameters->uxLED );
/* Delay for half the flash period then turn the LED off. */
vTaskDelay( pxParameters->xFlashRate / ( TickType_t ) 2 );
vParTestToggleLED( pxParameters->uxLED );
}
}
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