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@ -58,9 +58,9 @@
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*
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* main() creates all the demo application tasks, then starts the scheduler.
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* A lot of the created tasks are from the pool of "standard demo" tasks. The
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* web documentation provides more details of the standard demo application
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* tasks, which provide no particular functionality but do provide a good
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* example of how to use the FreeRTOS API.
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* web documentation provides more details of the standard demo tasks, which
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* provide no particular functionality but do provide good examples of how to
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* use the FreeRTOS API.
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*
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* In addition to the standard demo tasks, the following tasks, interrupts and
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* tests are defined and/or created within this file:
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@ -73,7 +73,7 @@
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* the actual LCD output. This mechanism also allows interrupts to, in effect,
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* write to the LCD by sending messages to the LCD task.
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*
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* The LCD task is also a demonstration of a controller task design pattern.
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* The LCD task is also a demonstration of a 'controller' task design pattern.
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* Some tasks do not actually send a string to the LCD task directly, but
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* instead send a command that is interpreted by the LCD task. In a normal
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* application these commands can be control values or set points, in this
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@ -145,18 +145,16 @@
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to send messages from tasks and interrupts the the LCD task. */
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#define mainQUEUE_LENGTH ( 5 )
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/* Codes sent within message to the LCD task so the LCD task can interrupt
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/* Codes sent within messages to the LCD task so the LCD task can interpret
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exactly what the message it just received was. These are sent in the
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cMessageID member of the message structure (defined below). */
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#define mainMESSAGE_BUTTON_UP ( 1 )
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#define mainMESSAGE_BUTTON_SEL ( 2 )
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#define mainMESSAGE_STATUS ( 3 )
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/* When cMessageID member of the message sent to the LCD task is
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/* When the cMessageID member of the message sent to the LCD task is
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mainMESSAGE_STATUS then these definitions are sent in the lMessageValue member
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of the same message to indicate what the status actually is. The value 1 is not
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used as this is globally defined as pdPASS, and indicates that no errors have
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been reported (the system is running as expected). */
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of the same message and indicate what the status actually is. */
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#define mainERROR_DYNAMIC_TASKS ( pdPASS + 1 )
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#define mainERROR_COM_TEST ( pdPASS + 2 )
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#define mainERROR_GEN_QUEUE_TEST ( pdPASS + 3 )
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@ -240,7 +238,7 @@ void main( void )
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/* Create the LCD and button poll tasks, as described at the top of this
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file. */
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xTaskCreate( prvLCDTask, ( signed char * ) "LCD", configMINIMAL_STACK_SIZE, NULL, mainLCD_TASK_PRIORITY, NULL );
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xTaskCreate( vButtonPollTask, ( signed char * ) "Temp", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
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xTaskCreate( vButtonPollTask, ( signed char * ) "ButPoll", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
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/* Create a subset of the standard demo tasks. */
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vStartDynamicPriorityTasks();
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@ -284,13 +282,14 @@ static char cBuffer[ 512 ];
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for( ;; )
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{
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/* Wait for a message to be received. This will wait indefinitely if
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INCLUDE_vTaskSuspend is set to 1 in FreeRTOSConfig.h, therefore there
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is no need to check the function return value. */
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/* Wait for a message to be received. Using portMAX_DELAY as the block
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time will result in an indefinite wait provided INCLUDE_vTaskSuspend is
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set to 1 in FreeRTOSConfig.h, therefore there is no need to check the
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function return value and the function will only return when a value
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has been received. */
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xQueueReceive( xLCDQueue, &xReceivedMessage, portMAX_DELAY );
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/* Clear the LCD if the last LCD message was output to the last
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available line on the LCD. */
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/* Clear the LCD if no room remains for any more text output. */
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if( lLine > Line9 )
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{
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LCD_Clear( Blue );
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@ -515,7 +514,7 @@ NVIC_InitTypeDef NVIC_InitStructure;
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automatically at the appropriate time. */
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/* TIM6 clock enable */
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);
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RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM6, ENABLE );
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/* The 32MHz clock divided by 5000 should tick (very) approximately every
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150uS and overflow a 16bit timer (very) approximately every 10 seconds. */
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Richard Barry
14 years ago