drv_timer.c

S3C4510B的一些开发例程

/***********************************************************************
 *  MODULE:        drv_timer.c     
 *  Description:   Timer Driver
 *  Runtime Env:   ARM7TDMI - KS32C50100
 *  Company:       
 *  Change History:
 *     03-28-02   Create (Yadong Wang)
 ***********************************************************************/
#include "common_types.h"
#include "samsung4510.h"
#include "main.h"

static void tm0isr(void);
static int	timeout0;


// define Timer data block, and pass in as iopb
tU32 DrvTimerInit(tU32 Dev)
{
	// Disable the interrupt, Disable_Int(nTIMER1_INT);    
	Disable_Int(nTIMER0_INT);

	// Install Vector
	SysSetInterrupt(nTIMER0_INT, tm0isr);

	// timer output pin enable if requested
//	IOPCON |= 0x40000000;
//	IOPMOD |= 0x10000;

	// Enable the timer with the toggle mode
	TMOD = 0x00000003;

	// Enable the INT, Enable_Int(nTIMER1_INT);  
	Enable_Int(nTIMER0_INT); 

	timeout0 = 0;

	return 0;
}

static void tm0isr()
{
	timeout0 = 1;
	INTPEND |= TIMER0_INT;
}


tU32 DrvTimerArm(tU32 DevId, tU32 Timeout)
{
	TMOD &= ~0x01;
	TDATA0 = Timeout * fMCLK_MHZ;
	TMOD |= 0x01;
	return 0;
}


tU32 DrvTimerTimeout(tU32 Dev)
{
	if (timeout0)
	{
		timeout0 = 0;
		return 1;
	}
	else
		return 0;

}

void Delay(tU32 n /* n in micro second */)
{
	tU32 i;

//	IOPDATA |= 0x00000001;
	DrvTimerArm(0, n);
	while(1)
	{
		if (DrvTimerTimeout(0))
			break;
		for(i=0; i<10; i++);
	}	
//	IOPDATA &= ~0x00000001;
}