Demo/RX600_RX62N-RSK_IAR/IntQueueTimer.c

/*
    FreeRTOS V7.0.0 - Copyright (C) 2011 Real Time Engineers Ltd.
	

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS tutorial books are available in pdf and paperback.        *
     *    Complete, revised, and edited pdf reference manuals are also       *
     *    available.                                                         *
     *                                                                       *
     *    Purchasing FreeRTOS documentation will not only help you, by       *
     *    ensuring you get running as quickly as possible and with an        *
     *    in-depth knowledge of how to use FreeRTOS, it will also help       *
     *    the FreeRTOS project to continue with its mission of providing     *
     *    professional grade, cross platform, de facto standard solutions    *
     *    for microcontrollers - completely free of charge!                  *
     *                                                                       *
     *    >>> See http://www.FreeRTOS.org/Documentation for details. <<<     *
     *                                                                       *
     *    Thank you for using FreeRTOS, and 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 modification 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.
*/

/*
 * This file contains the non-portable and therefore RX62N specific parts of
 * the IntQueue standard demo task - namely the configuration of the timers
 * that generate the interrupts and the interrupt entry points.
 */

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

/* Demo includes. */
#include "IntQueueTimer.h"
#include "IntQueue.h"

/* Hardware specifics. */
#include <iorx62n.h>

#define tmrTIMER_0_1_FREQUENCY	( 2000UL )
#define tmrTIMER_2_3_FREQUENCY	( 2001UL )

/* Handlers for the two timers used. */
__interrupt void vT0_1InterruptHandler( void );
__interrupt void vT2_3InterruptHandler( void );

void vInitialiseTimerForIntQueueTest( void )
{
	/* Ensure interrupts do not start until full configuration is complete. */
	portENTER_CRITICAL();
	{
		/* Cascade two 8bit timer channels to generate the interrupts.
		8bit timer unit 1 (TMR0 and TMR1) and 8bit timer unit 2 (TMR2 and TMR3 are
		utilised for this test. */

		/* Enable the timers. */
		SYSTEM.MSTPCRA.BIT.MSTPA5 = 0;
		SYSTEM.MSTPCRA.BIT.MSTPA4 = 0;

		/* Enable compare match A interrupt request. */
		TMR0.TCR.BIT.CMIEA = 1;
		TMR2.TCR.BIT.CMIEA = 1;

		/* Clear the timer on compare match A. */
		TMR0.TCR.BIT.CCLR = 1;
		TMR2.TCR.BIT.CCLR = 1;

		/* Set the compare match value. */
		TMR01.TCORA = ( unsigned short ) ( ( ( configPERIPHERAL_CLOCK_HZ / tmrTIMER_0_1_FREQUENCY ) -1 ) / 8 );
		TMR23.TCORA = ( unsigned short ) ( ( ( configPERIPHERAL_CLOCK_HZ / tmrTIMER_0_1_FREQUENCY ) -1 ) / 8 );

		/* 16 bit operation ( count from timer 1,2 ). */
		TMR0.TCCR.BIT.CSS = 3;
		TMR2.TCCR.BIT.CSS = 3;
	
		/* Use PCLK as the input. */
		TMR1.TCCR.BIT.CSS = 1;
		TMR3.TCCR.BIT.CSS = 1;
	
		/* Divide PCLK by 8. */
		TMR1.TCCR.BIT.CKS = 2;
		TMR3.TCCR.BIT.CKS = 2;
	
		/* Enable TMR 0, 2 interrupts. */
		IEN( TMR0, CMIA0 ) = 1;
		IEN( TMR2, CMIA2 ) = 1;

		/* Set the timer interrupts to be above the kernel.  The interrupts are
		assigned different priorities so they nest with each other. */
		IPR( TMR0, CMIA0 ) = configMAX_SYSCALL_INTERRUPT_PRIORITY - 1;
		IPR( TMR2, CMIA2 ) = ( configMAX_SYSCALL_INTERRUPT_PRIORITY - 2 );
	}
	portEXIT_CRITICAL();
	
	/* Ensure the interrupts are clear as they are edge detected. */
	IR( TMR0, CMIA0 ) = 0;
	IR( TMR2, CMIA2 ) = 0;
}
/*-----------------------------------------------------------*/

#pragma vector = VECT_TMR0_CMIA0
__interrupt void vT0_1InterruptHandler( void )
{
	__enable_interrupt();
	portYIELD_FROM_ISR( xFirstTimerHandler() );
}
/*-----------------------------------------------------------*/

#pragma vector = VECT_TMR2_CMIA2
__interrupt void vT2_3InterruptHandler( void )
{
	__enable_interrupt();
	portYIELD_FROM_ISR( xSecondTimerHandler() );
}