FreeRTOS/Demo/ARM7_AT91SAM7S64_IAR/main.c

/*
	FreeRTOS.org V4.1.3 - Copyright (C) 2003-2006 Richard Barry.

	This file is part of the FreeRTOS.org distribution.

	FreeRTOS.org is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	FreeRTOS.org 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
	along with FreeRTOS.org; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

	A special exception to the GPL can be applied should you wish to distribute
	a combined work that includes FreeRTOS.org, without being obliged to provide
	the source code for any proprietary components.  See the licensing section 
	of http://www.FreeRTOS.org for full details of how and when the exception
	can be applied.

	***************************************************************************
	See http://www.FreeRTOS.org for documentation, latest information, license 
	and contact details.  Please ensure to read the configuration and relevant 
	port sections of the online documentation.
	***************************************************************************
*/

/* 
	NOTE : Tasks run in system mode and the scheduler runs in Supervisor mode.
	The processor MUST be in supervisor mode when vTaskStartScheduler is 
	called.  The demo applications included in the FreeRTOS.org download switch
	to supervisor mode prior to main being called.  If you are not using one of
	these demo application projects then ensure Supervisor mode is used.
*/

/*
 * Creates all the demo application tasks, then starts the scheduler.  The WEB
 * documentation provides more details of the demo application tasks.  The SAM7
 * includes a sample USB that emulates a Joystick input to a USB host.
 * 
 * Main.c also creates a task called "Check".  This only executes every three 
 * seconds but has the highest priority so is guaranteed to get processor time.  
 * Its main function is to check that all the other tasks are still operational.
 * Each task (other than the "flash" tasks) maintains a unique count that is 
 * incremented each time the task successfully completes its function.  Should 
 * any error occur within such a task the count is permanently halted.  The 
 * check task inspects the count of each task to ensure it has changed since
 * the last time the check task executed.  If all the count variables have 
 * changed all the tasks are still executing error free, and the check task
 * toggles the onboard LED.  Should any task contain an error at any time 
 * the LED toggle rate will change from 3 seconds to 500ms.
 *
 */

/* Standard includes. */
#include <stdlib.h>

/* Scheduler includes. */
#include "FreeRTOS.h"
#include "task.h"

/* Demo application includes. */
#include "flash.h"
#include "integer.h"
#include "PollQ.h"
#include "BlockQ.h"
#include "semtest.h"
#include "dynamic.h"
#include "partest.h"
#include "comtest2.h"
#include "USB/USBSample.h"

/* Priorities for the demo application tasks. */
#define mainLED_TASK_PRIORITY		( tskIDLE_PRIORITY + 3 )
#define mainQUEUE_POLL_PRIORITY		( tskIDLE_PRIORITY + 2 )
#define mainCHECK_TASK_PRIORITY		( tskIDLE_PRIORITY + 4 )
#define mainSEM_TEST_PRIORITY		( tskIDLE_PRIORITY + 1 )
#define mainBLOCK_Q_PRIORITY		( tskIDLE_PRIORITY + 2 )
#define mainCOM_TEST_PRIORITY		( tskIDLE_PRIORITY + 2 )
#define mainUSB_PRIORITY			( tskIDLE_PRIORITY + 2 )

/* Constants required by the 'Check' task. */
#define mainNO_ERROR_FLASH_PERIOD	( ( portTickType ) 3000 / portTICK_RATE_MS  )
#define mainERROR_FLASH_PERIOD		( ( portTickType ) 500 / portTICK_RATE_MS  )
#define mainCHECK_TASK_LED			( 3 )

/* Constants for the ComTest tasks. */
#define mainCOM_TEST_BAUD_RATE		( ( unsigned portLONG ) 115200 )
#define mainCOM_TEST_LED			( 4 ) /* Off the board. */

/*
 * The task that executes at the highest priority and calls 
 * prvCheckOtherTasksAreStillRunning().  See the description at the top
 * of the file.
 */
static void vErrorChecks( void *pvParameters );

/*
 * Configure the processor for use with the Atmel demo board.  Setup is minimal
 * as the low level init function (called from the startup asm file) takes care
 * of most things.
 */
static void prvSetupHardware( void );

/*
 * Checks that all the demo application tasks are still executing without error
 * - as described at the top of the file.
 */
static portLONG prvCheckOtherTasksAreStillRunning( void );


/*-----------------------------------------------------------*/

/*
 * Starts all the other tasks, then starts the scheduler. 
 */
void main( void )
{
	/* Setup any hardware that has not already been configured by the low
	level init routines. */
	prvSetupHardware();

	/* Initialise the LED outputs for use by the demo application tasks. */
	vParTestInitialise();

	/* Start all the standard demo application tasks. */
	vStartIntegerMathTasks( tskIDLE_PRIORITY );
	vStartLEDFlashTasks( mainLED_TASK_PRIORITY );
	vStartPolledQueueTasks( mainQUEUE_POLL_PRIORITY );
	vStartSemaphoreTasks( mainSEM_TEST_PRIORITY );
	vStartBlockingQueueTasks( mainBLOCK_Q_PRIORITY );
	vStartDynamicPriorityTasks();
	vAltStartComTestTasks( mainCOM_TEST_PRIORITY, mainCOM_TEST_BAUD_RATE, mainCOM_TEST_LED );
	
	/* Also start the USB demo which is just for the SAM7. */
	xTaskCreate( vUSBDemoTask, "USB", configMINIMAL_STACK_SIZE, NULL, mainUSB_PRIORITY, NULL );
	
	/* Start the check task - which is defined in this file. */
	xTaskCreate( vErrorChecks, "Check", configMINIMAL_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY, NULL );

	/* Start the scheduler.

	NOTE : Tasks run in system mode and the scheduler runs in Supervisor mode.
	The processor MUST be in supervisor mode when vTaskStartScheduler is 
	called.  The demo applications included in the FreeRTOS.org download switch
	to supervisor mode prior to main being called.  If you are not using one of
	these demo application projects then ensure Supervisor mode is used here. */

	vTaskStartScheduler();

	/* We should never get here as control is now taken by the scheduler. */
  	return;
}
/*-----------------------------------------------------------*/

static void prvSetupHardware( void )
{
	/* When using the JTAG debugger the hardware is not always initialised to
	the correct default state.  This line just ensures that this does not
	cause all interrupts to be masked at the start. */
	AT91C_BASE_AIC->AIC_EOICR = 0;
	
	/* Most setup is performed by the low level init function called from the 
	startup asm file. */

	/* Configure the PIO Lines corresponding to LED1 to LED4 to be outputs as 
	well as the UART Tx line. */
	AT91F_PIO_CfgOutput( AT91C_BASE_PIOA, LED_MASK );
	
	/* Enable the peripheral clock. */
	AT91F_PMC_EnablePeriphClock( AT91C_BASE_PMC, 1 << AT91C_ID_PIOA );
}
/*-----------------------------------------------------------*/

static void vErrorChecks( void *pvParameters )
{
portTickType xDelayPeriod = mainNO_ERROR_FLASH_PERIOD;

	/* The parameters are not used in this task. */
	( void ) pvParameters;

	/* Cycle for ever, delaying then checking all the other tasks are still
	operating without error.  If an error is detected then the delay period
	is decreased from mainNO_ERROR_FLASH_PERIOD to mainERROR_FLASH_PERIOD so
	the on board LED flash rate will increase. */

	for( ;; )
	{
		/* Delay until it is time to execute again. */
		vTaskDelay( xDelayPeriod );
	
		/* Check all the standard demo application tasks are executing without 
		error. */
		if( prvCheckOtherTasksAreStillRunning() != pdPASS )
		{
			/* An error has been detected in one of the tasks - flash faster. */
			xDelayPeriod = mainERROR_FLASH_PERIOD;
		}
		
		vParTestToggleLED( mainCHECK_TASK_LED );
	}
}
/*-----------------------------------------------------------*/

static portLONG prvCheckOtherTasksAreStillRunning( void )
{
portLONG lReturn = ( portLONG ) pdPASS;

	/* Check all the demo tasks (other than the flash tasks) to ensure
	that they are all still running, and that none of them have detected
	an error. */

	if( xAreIntegerMathsTaskStillRunning() != pdTRUE )
	{
		lReturn = ( portLONG ) pdFAIL;
	}

	if( xArePollingQueuesStillRunning() != pdTRUE )
	{
		lReturn = ( portLONG ) pdFAIL;
	}

	if( xAreSemaphoreTasksStillRunning() != pdTRUE )
	{
		lReturn = ( portLONG ) pdFAIL;
	}

	if( xAreBlockingQueuesStillRunning() != pdTRUE )
	{
		lReturn = ( portLONG ) pdFAIL;
	}

	if( xAreComTestTasksStillRunning() != pdTRUE )
	{
		lReturn = ( portLONG ) pdFAIL;
	}

	if( xAreDynamicPriorityTasksStillRunning() != pdTRUE )
	{
		lReturn = ( portLONG ) pdFAIL;
	}

	return lReturn;
}
/*-----------------------------------------------------------*/