/* FreeRTOS V6.1.0 - Copyright (C) 2010 Real Time Engineers Ltd. *************************************************************************** * * * If you are: * * * * + New to FreeRTOS, * * + Wanting to learn FreeRTOS or multitasking in general quickly * * + Looking for basic training, * * + Wanting to improve your FreeRTOS skills and productivity * * * * then take a look at the FreeRTOS books - available as PDF or paperback * * * * "Using the FreeRTOS Real Time Kernel - a Practical Guide" * * http://www.FreeRTOS.org/Documentation * * * * A pdf reference manual is also available. Both are usually delivered * * to your inbox within 20 minutes to two hours when purchased between 8am * * and 8pm GMT (although please allow up to 24 hours in case of * * exceptional circumstances). Thank you for your support! * * * *************************************************************************** This file is part of the FreeRTOS distribution. FreeRTOS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License (version 2) as published by the Free Software Foundation AND MODIFIED BY the FreeRTOS exception. ***NOTE*** The exception to the GPL is included to allow you to distribute a combined work that includes FreeRTOS without being obliged to provide the source code for proprietary components outside of the FreeRTOS kernel. FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License and the FreeRTOS license exception along with FreeRTOS; if not it can be viewed here: http://www.freertos.org/a00114.html and also obtained by writing to Richard Barry, contact details for whom are available on the FreeRTOS WEB site. 1 tab == 4 spaces! 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. */ #include #include "FreeRTOS.h" #include "task.h" #include "queue.h" #include "msp430.h" #include "hal_MSP-EXP430F5438.h" /* Codes sent within messages to the LCD task so the LCD task can interpret exactly what the message it just received was. These are sent in the cMessageID member of the message structure (defined below). */ #define mainMESSAGE_BUTTON_UP ( 1 ) #define mainMESSAGE_BUTTON_SEL ( 2 ) #define mainMESSAGE_STATUS ( 3 ) /* When the cMessageID member of the message sent to the LCD task is mainMESSAGE_STATUS then these definitions are sent in the cMessageValue member of the same message and indicate what the status actually is. */ #define mainERROR_DYNAMIC_TASKS ( pdPASS + 1 ) #define mainERROR_COM_TEST ( pdPASS + 2 ) #define mainERROR_GEN_QUEUE_TEST ( pdPASS + 3 ) #define mainERROR_REG_TEST ( pdPASS + 4 ) /* The length of the queue (the number of items the queue can hold) that is used to send messages from tasks and interrupts the the LCD task. */ #define mainQUEUE_LENGTH ( 5 ) #define mainLCD_TASK_PRIORITY ( tskIDLE_PRIORITY + 1 ) /*-----------------------------------------------------------*/ extern void vRegTest1Task( void *pvParameters ); extern void vRegTest2Task( void *pvParameters ); static void prvSetupHardware( void ); static void prvTerminalIOTask( void *pvParameters ); static void prvButtonPollTask( void *pvParameters ); static void prvGenerateStatusMessage( char *pcBuffer, long lStatusValue ); /*-----------------------------------------------------------*/ volatile unsigned short usRegTest1Counter = 0, usRegTest2Counter = 0; /* The handle of the queue used to send messages from tasks and interrupts to the LCD task. */ static xQueueHandle xLCDQueue = NULL; /* The definition of each message sent from tasks and interrupts to the LCD task. */ typedef struct { char cMessageID; /* << States what the message is. */ char cMessageValue; /* << States the message value (can be an integer, string pointer, etc. depending on the value of cMessageID. */ } xQueueMessage; /*-----------------------------------------------------------*/ void main( void ) { prvSetupHardware(); /* Create the queue used by tasks and interrupts to send strings to the LCD task. */ xLCDQueue = xQueueCreate( mainQUEUE_LENGTH, sizeof( xQueueMessage ) ); if( xLCDQueue != NULL ) { /* Add the created queue to the queue registry so it can be viewed in the IAR FreeRTOS state viewer plug-in. */ vQueueAddToRegistry( xLCDQueue, "LCDQueue" ); /* Create the terminal IO and button poll tasks, as described at the top of this file. */ xTaskCreate( prvTerminalIOTask, ( signed char * ) "IO", configMINIMAL_STACK_SIZE, NULL, mainLCD_TASK_PRIORITY, NULL ); xTaskCreate( prvButtonPollTask, ( signed char * ) "ButPoll", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL ); xTaskCreate( vRegTest1Task, "RegTest1", configMINIMAL_STACK_SIZE, NULL, 0, NULL ); xTaskCreate( vRegTest2Task, "RegTest2", configMINIMAL_STACK_SIZE, NULL, 0, NULL ); vTaskStartScheduler(); } for( ;; ); } /*-----------------------------------------------------------*/ static void prvTerminalIOTask( void *pvParameters ) { xQueueMessage xReceivedMessage; /* Buffer into which strings are formatted and placed ready for display on the LCD. Note this is a static variable to prevent it being allocated on the task stack, which is too small to hold such a variable. The stack size is configured when the task is created. */ static char cBuffer[ 512 ]; /* This function is the only function that uses printf(). If printf() is used from any other function then some sort of mutual exclusion on stdout will be necessary. This is also the only function that is permitted to access the LCD. First print out the number of bytes that remain in the FreeRTOS heap. This can be viewed in the terminal IO window within the IAR Embedded Workbench. */ printf( "%d bytes of heap space remain unallocated\n", ( int ) xPortGetFreeHeapSize() ); for( ;; ) { /* Wait for a message to be received. Using portMAX_DELAY as the block time will result in an indefinite wait provided INCLUDE_vTaskSuspend is set to 1 in FreeRTOSConfig.h, therefore there is no need to check the function return value and the function will only return when a value has been received. */ xQueueReceive( xLCDQueue, &xReceivedMessage, portMAX_DELAY ); /* What is this message? What does it contain? */ switch( xReceivedMessage.cMessageID ) { case mainMESSAGE_BUTTON_UP : /* The button poll task has just informed this task that the up button on the joystick input has been pressed or released. */ sprintf( cBuffer, "Button up = %d", xReceivedMessage.cMessageValue ); break; case mainMESSAGE_BUTTON_SEL : /* The select button interrupt just informed this task that the select button was pressed. Generate a table of task run time statistics and output this to the terminal IO window in the IAR embedded workbench. */ printf( "\nTask\t Abs Time\t %%Time\n*****************************************" ); // vTaskGetRunTimeStats( ( signed char * ) cBuffer ); // printf( cBuffer ); break; case mainMESSAGE_STATUS : /* The tick interrupt hook function has just informed this task of the system status. Generate a string in accordance with the status value. */ prvGenerateStatusMessage( cBuffer, xReceivedMessage.cMessageValue ); break; default : sprintf( cBuffer, "Unknown message" ); break; } /* Output the message that was placed into the cBuffer array within the switch statement above. */ printf( "%s : %u\n", cBuffer, ( unsigned int ) xTaskGetTickCount() ); fflush( stdout ); } } /*-----------------------------------------------------------*/ static void prvGenerateStatusMessage( char *pcBuffer, long lStatusValue ) { /* Just a utility function to convert a status value into a meaningful string for output onto the LCD. */ switch( lStatusValue ) { case pdPASS : sprintf( pcBuffer, "Task status = PASS" ); break; case mainERROR_DYNAMIC_TASKS : sprintf( pcBuffer, "Error: Dynamic tasks" ); break; case mainERROR_COM_TEST : sprintf( pcBuffer, "Err: loop connected?" ); /* Error in COM test - is the Loopback connector connected? */ break; case mainERROR_GEN_QUEUE_TEST : sprintf( pcBuffer, "Error: Gen Q test" ); break; case mainERROR_REG_TEST : sprintf( pcBuffer, "Error: Reg test" ); break; default : sprintf( pcBuffer, "Unknown status" ); break; } } /*-----------------------------------------------------------*/ static void prvButtonPollTask( void *pvParameters ) { unsigned char ucLastState = pdFALSE, ucState; xQueueMessage xMessage; /* This tasks performs the button polling functionality as described at the top of this file. */ for( ;; ) { /* Check the button state. */ ucState = ( halButtonsPressed() & BUTTON_UP ); if( ucState != 0 ) { ucState = pdTRUE; } if( ucState != ucLastState ) { /* The state has changed, send a message to the LCD task. */ xMessage.cMessageID = mainMESSAGE_BUTTON_UP; xMessage.cMessageValue = ucState; ucLastState = ucState; xQueueSend( xLCDQueue, &xMessage, portMAX_DELAY ); } /* Block for 10 milliseconds so this task does not utilise all the CPU time and debouncing of the button is not necessary. */ vTaskDelay( 10 / portTICK_RATE_MS ); } } /*-----------------------------------------------------------*/ static void prvSetupHardware( void ) { halBoardInit(); halButtonsInit( BUTTON_ALL ); halButtonsInterruptEnable( BUTTON_SELECT ); LFXT_Start (XT1DRIVE_0); Init_FLL_Settle( 18000, 488 ); } /*-----------------------------------------------------------*/ void vApplicationSetupTimerInterrupt( void ) { const unsigned short usACLK_Frequency_Hz = 32768; /* Ensure the timer is stopped. */ TA0CTL = 0; /* Run the timer of the ACLK. */ TA0CTL = TASSEL_1; /* Clear everything to start with. */ TA0CTL |= TACLR; /* Set the compare match value according to the tick rate we want. */ TA0CCR0 = usACLK_Frequency_Hz / configTICK_RATE_HZ; /* Enable the interrupts. */ TA0CCTL0 = CCIE; /* Start up clean. */ TA0CTL |= TACLR; /* Up mode. */ TA0CTL |= MC_1; } /*-----------------------------------------------------------*/ void vApplicationMallocFailedHook( void ) { for( ;; ); } /*-----------------------------------------------------------*/ void vApplicationStackOverflowHook( xTaskHandle *pxTask, signed char *pcTaskName ) { ( void ) pxTask; ( void ) pcTaskName; for( ;; ); } /*-----------------------------------------------------------*/ void vApplicationIdleHook( void ) { __bis_SR_register( LPM3_bits + GIE ); } /*-----------------------------------------------------------*/ void vApplicationTickHook( void ) { static unsigned short usLastRegTest1Counter = 0, usLastRegTest2Counter = 0; static unsigned long ulCounter = 0; static const unsigned long ulCheckFrequency = 5000UL / portTICK_RATE_MS; portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; /* Define the status message that is sent to the LCD task. By default the status is PASS. */ static xQueueMessage xStatusMessage = { mainMESSAGE_STATUS, pdPASS }; /* This is called from within the tick interrupt and performs the 'check' functionality as described in the comments at the top of this file. Is it time to perform the 'check' functionality again? */ ulCounter++; if( ulCounter >= ulCheckFrequency ) { #ifdef LEFT_OVER_FROM_CUT_AND_PASTE /* See if the standard demo tasks are executing as expected, changing the message that is sent to the LCD task from PASS to an error code if any tasks set reports an error. */ if( xAreDynamicPriorityTasksStillRunning() != pdPASS ) { xStatusMessage.lMessageValue = mainERROR_DYNAMIC_TASKS; } if( xAreComTestTasksStillRunning() != pdPASS ) { xStatusMessage.lMessageValue = mainERROR_COM_TEST; } if( xAreGenericQueueTasksStillRunning() != pdPASS ) { xStatusMessage.lMessageValue = mainERROR_GEN_QUEUE_TEST; } #else /* Check the reg test tasks are still cycling. They will stop incrementing their loop counters if they encounter an error. */ if( usRegTest1Counter == usLastRegTest1Counter ) { xStatusMessage.cMessageValue = mainERROR_REG_TEST; } if( usRegTest2Counter == usLastRegTest2Counter ) { xStatusMessage.cMessageValue = mainERROR_REG_TEST; } usLastRegTest1Counter = usRegTest1Counter; usLastRegTest2Counter = usRegTest2Counter; #endif /* As this is the tick hook the lHigherPriorityTaskWoken parameter is not needed (a context switch is going to be performed anyway), but it must still be provided. */ xQueueSendFromISR( xLCDQueue, &xStatusMessage, &xHigherPriorityTaskWoken ); ulCounter = 0; } if( ( ulCounter & 0xff ) == 0 ) { if( ( LED_PORT_OUT & LED_1 ) == 0 ) { LED_PORT_OUT |= LED_1; LED_PORT_OUT &= ~LED_2; } else { LED_PORT_OUT &= ~LED_1; LED_PORT_OUT |= LED_2; } } }