/* | |
FreeRTOS.org V5.1.2 - Copyright (C) 2003-2009 Richard Barry. | |
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*************************************************************************** | |
*************************************************************************** | |
* * | |
* Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation * | |
* * | |
* This is a concise, step by step, 'hands on' guide that describes both * | |
* general multitasking concepts and FreeRTOS specifics. It presents and * | |
* explains numerous examples that are written using the FreeRTOS API. * | |
* Full source code for all the examples is provided in an accompanying * | |
* .zip file. * | |
* * | |
*************************************************************************** | |
*************************************************************************** | |
Please ensure to read the configuration and relevant port sections of the | |
online documentation. | |
http://www.FreeRTOS.org - Documentation, latest information, license and | |
contact details. | |
http://www.SafeRTOS.com - A version that is certified for use in safety | |
critical systems. | |
http://www.OpenRTOS.com - Commercial support, development, porting, | |
licensing and training services. | |
*/ | |
/** | |
* 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 | |
portTickType rather than unsigned portLONG. | |
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. */ | |
portTickType 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 portCHAR * 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 portTickType 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 * ( portTickType ) uxLEDTask ) ); | |
pxLEDParameters->xFlashRate /= portTICK_RATE_MS; | |
/* Spawn the task. */ | |
xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, ( void * ) pxLEDParameters, uxPriority, ( xTaskHandle * ) 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 / ( portTickType ) 2 ); | |
vParTestToggleLED( pxParameters->uxLED ); | |
/* Delay for half the flash period then turn the LED off. */ | |
vTaskDelay( pxParameters->xFlashRate / ( portTickType ) 2 ); | |
vParTestToggleLED( pxParameters->uxLED ); | |
} | |
} | |