timer.c

开发板外设接口实验（1～7）

/*
 *	timer.c   -  timer api & driver 
 *	
 *	Author: 	li ming <[e-mail]>
 *	Date:		2008-4-16
 *	Copyleft:	http://www.lumit.org
 */
 
#include "timer.h"

/* define the relative gpio register */
#define SYSCFG      0x03FF0000
#define IOPMOD		(*((volatile unsigned *)(SYSCFG+0x5000)))
#define IOPCON		(*((volatile unsigned *)(SYSCFG+0x5004)))
#define IOPDATA		(*((volatile unsigned *)(SYSCFG+0x5008)))

// timer mode register
#define TMOD		(*((volatile unsigned *)(SYSCFG+0x6000)))  
#define TDATA0		(*((volatile unsigned *)(SYSCFG+0x6004)))
#define TDATA1		(*((volatile unsigned *)(SYSCFG+0x6008)))
#define TCNT0		(*((volatile unsigned *)(SYSCFG+0x600c)))
#define TCNT1		(*((volatile unsigned *)(SYSCFG+0x6010)))

/* set timer related gpio */
int timer_init(void)
{
	/* enable timer 0 */
	//TMOD = 1;
	IOPMOD = 0x3ffff;
	IOPCON = 0x80000000;
	IOPDATA = 0x0;
	TMOD = 0x3f;//3f
	
	return 0;
}

int timer_get_value(void)
{ 	
	return TCNT1;
	return TCNT0;
} 

int timer_set_value(int value)
{ 	
	TDATA0 = value;
	TDATA1 = value;
		
	return 0;
} 

#define TIME_OUT  0x3200000

int timer_test(void)
{
	int t = 0;
	int counter = 0;
	
	timer_set_value(TIME_OUT);
	timer_init();
	
	while(1)
	
	
	{
		t = timer_get_value();
		if(t <= 0x10)
		{				
			// timer_set_value(TIME_OUT);
			counter++;
			
			if( counter % 2 == 1 )
				*(volatile unsigned *)(0x3ff5008) |= 0x70;
			else
				*(volatile unsigned *)(0x3ff5008) &= ~0x70;
		}	
	}
	
	return 0;
}