main.c

FreeRTOS source code as bundled with the book "Using FreeRTOS Real-Time Kernel - A Practical Approac

/*
	FreeRTOS.org V5.0.4 - Copyright (C) 2003-2008 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.

    ***************************************************************************
    ***************************************************************************
    *                                                                         *
    * SAVE TIME AND MONEY!  We can port FreeRTOS.org to your own hardware,    *
    * and even write all or part of your application on your behalf.          *
    * See http://www.OpenRTOS.com for details of the services we provide to   *
    * expedite your project.                                                  *
    *                                                                         *
    ***************************************************************************
    ***************************************************************************

	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.
*/

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

/* Demo includes. */
#include "basic_io.h"

/* The task function. */
void vTaskFunction( void *pvParameters );

/* Define the strings that will be passed in as the task parameters.  These are
defined const and off the stack to ensure they remain valid when the tasks are
executing. */
const char *pcTextForTask1 = "Task 1 is running\r\n";
const char *pcTextForTask2 = "Task 2 is running\t\n";

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

int main( void )
{
	/* Create the first task at priority 1... */
	xTaskCreate( vTaskFunction, "Task 1", 1000, (void*)pcTextForTask1, 1, NULL );

	/* ... and the second task at priority 2.  The priority is the second to
	last parameter. */
	xTaskCreate( vTaskFunction, "Task 2", 1000, (void*)pcTextForTask2, 2, NULL );

	/* Start the scheduler so our tasks start executing. */
	vTaskStartScheduler();	
	
	for( ;; );
	return 0;
}
/*-----------------------------------------------------------*/

void vTaskFunction( void *pvParameters )
{
char *pcTaskName;
portTickType xLastWakeTime;

	/* The string to print out is passed in via the parameter.  Cast this to a
	character pointer. */
	pcTaskName = ( char * ) pvParameters;

	/* The xLastWakeTime variable needs to be initialized with the current tick
	count.  Note that this is the only time we access this variable.  From this
	point on xLastWakeTime is managed automatically by the vTaskDelayUntil()
	API function. */
	xLastWakeTime = xTaskGetTickCount();

	/* As per most tasks, this task is implemented in an infinite loop. */
	for( ;; )
	{
		/* Print out the name of this task. */
		vPrintString( pcTaskName );

		/* We want this task to execute exactly every 250 milliseconds.  As per
		the vTaskDelay() function, time is measured in ticks, and the
		portTICK_RATE_MS constant is used to convert this to milliseconds.
		xLastWakeTime is automatically updated within vTaskDelayUntil() so does not
		have to be updated by this task code. */
		vTaskDelayUntil( &xLastWakeTime, ( 250 / portTICK_RATE_MS ) );
	}
}