FreeRTOS/Demo/RX600_RX64M_RSK_GCC_e2studio/src/IntQueueTimer.c

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*/

/*
 * This file contains the non-portable and therefore RX64M 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 "iodefine.h"
#include "rskrx64mdef.h"

#define IPR_PERIB_INTB128	128
#define IPR_PERIB_INTB129	129
#define IER_PERIB_INTB128	0x10
#define IER_PERIB_INTB129	0x10
#define	IEN_PERIB_INTB128	IEN0
#define	IEN_PERIB_INTB129	IEN1
#define IR_PERIB_INTB128	128
#define IR_PERIB_INTB129	129

void vIntQTimerISR0( void ) __attribute__ ((interrupt));
void vIntQTimerISR1( void ) __attribute__ ((interrupt));

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

void vInitialiseTimerForIntQueueTest( void )
{
	/* Ensure interrupts do not start until full configuration is complete. */
	portENTER_CRITICAL();
	{
		/* Give write access. */
		SYSTEM.PRCR.WORD = 0xa502;

		/* 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. */
		TMR0.TCR.BIT.CMIEA = 1;
		TMR2.TCR.BIT.CMIEA = 1;

		/* Map TMR0 CMIA0 interrupt to vector slot B number 128 and set
		priority above the kernel's priority, but below the max syscall
		priority. */
	    ICU.SLIBXR128.BYTE = 3; /* Three is TMR0 compare match A. */
	    IPR( PERIB, INTB128 ) = configMAX_SYSCALL_INTERRUPT_PRIORITY - 1;
		IEN( PERIB, INTB128 ) = 1;

		/* Ensure that the flag is set to 0, otherwise the interrupt will not be
		accepted. */
		IR( PERIB, INTB128 ) = 0;

		/* Do the same for TMR2, but to vector 129. */
	    ICU.SLIBXR129.BYTE = 9; /* Nine is TMR2 compare match A. */
	    IPR( PERIB, INTB129 ) = configMAX_SYSCALL_INTERRUPT_PRIORITY - 2;
		IEN( PERIB, INTB129 ) = 1;
		IR( PERIB, INTB129 ) = 0;
	}
	portEXIT_CRITICAL();
}
/*-----------------------------------------------------------*/

/* On vector 128. */
void vIntQTimerISR0( void )
{
	/* Enable interrupts to allow interrupt nesting. */
	__asm volatile( "setpsw	i" );

	portYIELD_FROM_ISR( xFirstTimerHandler() );
}
/*-----------------------------------------------------------*/

/* On vector 129. */
void vIntQTimerISR1( void )
{
	/* Enable interrupts to allow interrupt nesting. */
	__asm volatile( "setpsw	i" );

	portYIELD_FROM_ISR( xSecondTimerHandler() );
}