FreeRTOS/Demo/RX600_RX62N-RSK_IAR/IntQueueTimer.c

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*/

/*
 * 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() );
}