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@ -48,16 +48,8 @@
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*/
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/**
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* This version of flash .c is for use on systems that have limited stack space
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* and no display facilities. The complete version can be found in the
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* Demo/Common/Full directory.
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*
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* Three tasks are created, each of which flash an LED at a different rate. The first
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* LED flashes every 200ms, the second every 400ms, the third every 600ms.
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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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* Defines the tasks and co-routines used to toggle the segments of the two
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* seven segment displays, as described at the top of main.c
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*/
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@ -70,40 +62,60 @@
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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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#define ledSTACK_SIZE configMINIMAL_STACK_SIZE
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#define ledNUMBER_OF_LEDS ( 7 )
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/*-----------------------------------------------------------*/
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/* One task per segment of the left side display. */
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#define ledNUM_OF_LED_TASKS ( 7 )
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/* Each task toggles at a frequency that is a multiple of 333ms. */
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#define ledFLASH_RATE_BASE ( ( portTickType ) 333 )
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#define ledMAX_FLASH_CO_ROUTINES 7
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/* One co-routine per segment of the right hand display. */
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#define ledNUM_OF_LED_CO_ROUTINES 7
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/* All co-routines run at the same priority. */
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#define ledCO_ROUTINE_PRIORITY 0
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/* The task that is created three times. */
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/*-----------------------------------------------------------*/
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/* The task that is created 7 times. */
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static void vLEDFlashTask( void *pvParameters );
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/* The co-routine that is created 7 times. */
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static void prvFixedDelayCoRoutine( xCoRoutineHandle xHandle, unsigned short usIndex );
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/* This task is created once, but itself creates 7 co-routines. */
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static void vLEDCoRoutineControlTask( void *pvParameters );
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static xTaskHandle xFlashTaskHandles[ ledNUMBER_OF_LEDS ] = { 0 };
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/* Handles to each of the 7 tasks. Used so the tasks can be suspended
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and resumed. */
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static xTaskHandle xFlashTaskHandles[ ledNUM_OF_LED_TASKS ] = { 0 };
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/* Handle to the task in which the co-routines run. Used so the
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co-routines can be suspended and resumed. */
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static xTaskHandle xCoroutineTask;
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/*-----------------------------------------------------------*/
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/**
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* Creates the tasks and co-routines used to toggle the segments of the two
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* seven segment displays, as described at the top of main.c
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*/
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void vCreateFlashTasksAndCoRoutines( void )
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{
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signed short sLEDTask;
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/* Create the three tasks that flash segments on the first LED. */
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for( sLEDTask = 0; sLEDTask < ledNUMBER_OF_LEDS; ++sLEDTask )
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/* Create the tasks that flash segments on the first LED. */
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for( sLEDTask = 0; sLEDTask < ledNUM_OF_LED_TASKS; ++sLEDTask )
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{
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/* Spawn the task. */
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xTaskCreate( vLEDFlashTask, ( signed char * ) "LEDt", ledSTACK_SIZE, ( void * ) sLEDTask, ( tskIDLE_PRIORITY + 1 ), &( xFlashTaskHandles[ sLEDTask ] ) );
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xTaskCreate( vLEDFlashTask, ( signed char * ) "LEDt", configMINIMAL_STACK_SIZE, ( void * ) sLEDTask, ( tskIDLE_PRIORITY + 1 ), &( xFlashTaskHandles[ sLEDTask ] ) );
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}
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/* Create the task in which the co-routines run. */
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xTaskCreate( vLEDCoRoutineControlTask, ( signed char * ) "LEDc", ledSTACK_SIZE, NULL, tskIDLE_PRIORITY, &xCoroutineTask );
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/* Create the task in which the co-routines run. The co-routines themselves
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are created within the task. */
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xTaskCreate( vLEDCoRoutineControlTask, ( signed char * ) "LEDc", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, &xCoroutineTask );
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}
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/*-----------------------------------------------------------*/
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@ -111,9 +123,11 @@ void vSuspendFlashTasks( unsigned char ucIndex, short sSuspendTasks )
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{
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short sLEDTask;
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if( ucIndex == 0 )
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if( ucIndex == configLEFT_DISPLAY )
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{
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for( sLEDTask = 0; sLEDTask < ledNUMBER_OF_LEDS; ++sLEDTask )
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/* Suspend or resume the tasks that are toggling the segments of the
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left side display. */
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for( sLEDTask = 0; sLEDTask < ledNUM_OF_LED_TASKS; ++sLEDTask )
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{
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if( xFlashTaskHandles[ sLEDTask ] != NULL )
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{
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@ -130,6 +144,8 @@ short sLEDTask;
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}
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else
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{
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/* Suspend or resume the task in which the co-routines are running. The
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co-routines toggle the segments of the right side display. */
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if( sSuspendTasks == pdTRUE )
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{
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vTaskSuspend( xCoroutineTask );
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@ -181,11 +197,14 @@ unsigned short usCoroutine;
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( void ) pvParameters;
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for( usCoroutine = 0; usCoroutine < ledMAX_FLASH_CO_ROUTINES; usCoroutine++ )
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/* Create the co-routines - one of each segment of the right side display. */
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for( usCoroutine = 0; usCoroutine < ledNUM_OF_LED_CO_ROUTINES; usCoroutine++ )
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{
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xCoRoutineCreate( prvFixedDelayCoRoutine, ledCO_ROUTINE_PRIORITY, usCoroutine );
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}
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/* This task has nothing else to do except scheduler the co-routines it just
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created. */
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for( ;; )
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{
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vCoRoutineSchedule();
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@ -197,7 +216,7 @@ static void prvFixedDelayCoRoutine( xCoRoutineHandle xHandle, unsigned short usI
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{
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/* The usIndex parameter of the co-routine function is used as an index into
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the xFlashRates array to obtain the delay period to use. */
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static const portTickType xFlashRates[ ledMAX_FLASH_CO_ROUTINES ] = { 150 / portTICK_RATE_MS,
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static const portTickType xFlashRates[ ledNUM_OF_LED_CO_ROUTINES ] = { 150 / portTICK_RATE_MS,
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300 / portTICK_RATE_MS,
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450 / portTICK_RATE_MS,
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600 / portTICK_RATE_MS,
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@ -210,7 +229,12 @@ static const portTickType xFlashRates[ ledMAX_FLASH_CO_ROUTINES ] = { 150 / port
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for( ;; )
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{
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/* Toggle the LED. An offset of 8 is used to skip over the segments of
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the left side display which use the low numbers. */
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vParTestToggleLED( usIndex + 8 );
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/* Delay until it is time to toggle the segment that this co-routine is
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controlling again. */
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crDELAY( xHandle, xFlashRates[ usIndex ] );
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}
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