timer_api.c

ARM9系列,s3c2410实验代码

/*
 *	timer_api.c   -  timer api ( user-level )
 *	
 *	Author: 	li ming <[e-mail]>
 *	Date:		2005-6-12
 *	Copyleft:	http://www.lumit.org
 */
 
#include "timer_api.h"
#include "led_api.h"

extern int request_irq( unsigned int irq, void (*handler)(void) );

static void (*timer_irq_hooker)(void) = 0;

void timer_irq_handler( void )
{
	// here we add some user code for int0_irq
	if( timer_irq_hooker )
		timer_irq_hooker();
	
	// first we call low-level timer_irq_handler
	timer_ioctl( TIMER_CLEAR_INTERRUPT, 0 );
	
	return;
}

void timer_install_irq_hooker( void (*handler)(void) )
{
	timer_irq_hooker = handler;
}

/* set timer related gpio */
int timer_init( void )
{
	int timer_counter = 0x01effff0;
	
	// Timer 0 interrupt source number is 10
	request_irq( 10, timer_irq_handler );

	timer_open();
	
	// set Timer 0 count-down counter which is pointed by &timer_counter 
	timer_ioctl( TIMER_SET_COUNTER, (unsigned long)&timer_counter );
	
	// enable timer interrupt
	timer_ioctl( TIMER_ENABLE_INTERRUPT, 0 );

	return 0;
}

int timer_set_counter( int timer_counter )
{
	// set Timer 0 count-down counter which is pointed by &timer_counter 
	timer_ioctl( TIMER_SET_COUNTER, (unsigned long)&timer_counter );
	
	return 0;
}

int timer_test( void )
{	
	return 0;
}