ds1302.c

ds1302的驱动程序

#include <at89x51.h>
#include <ds1302.h>
void delay_ds1302_3xns(unsigned char x)
{
	unsigned char i;
	for(i=0;i<x;i++);
}
void delay_ds1302_1s()
{
	unsigned char i,j,z;
	for(z=0;z<5;z++)
		for(i=0;i<255;i++)
			for(j=0;j<255;j++);
}
void init_ds1302()
{
	IO_ds1302=0;
	SCLK_ds1302=0;
	REST_ds1302=0;
}
void Write_c_ds1302(unsigned char x)
{
	unsigned char i,j;
	void init_ds1302();
	j=x;
	REST_ds1302=1;
	delay_ds1302_1s();
	for(i=0;i<=6;i++)
	{
		if(j&0x01==1) IO_ds1302=1;
		else IO_ds1302=0;
		j=j>>1;
		delay_ds1302_3xns(20);
		SCLK_ds1302=1;
		delay_ds1302_3xns(84);
		SCLK_ds1302=0;
		delay_ds1302_3xns(70);
	}		
	if(j&0x01==1) IO_ds1302=1;
	else IO_ds1302=0;
	j=j>>1;
	delay_ds1302_3xns(20);
	SCLK_ds1302=1;
	delay_ds1302_3xns(84);
	SCLK_ds1302=0;
	delay_ds1302_3xns(70);
}
unsigned char Read_ds1302()
{
	unsigned char i,x;
	x=0;
	IO_ds1302=1;
	for(i=0;i<=6;i++)
	{
		if(IO_ds1302==1)
		{
			x=x+0x80;
			x=x>>1;
		}
		else x=x>>1;
		SCLK_ds1302=1;
		delay_ds1302_3xns(25);
		SCLK_ds1302=0;
		delay_ds1302_3xns(70);
	}
	if(IO_ds1302==1)
			x=x+0x80;
		else x=x>>1;
	IO_ds1302=0;
	SCLK_ds1302=0;	
	REST_ds1302=0;	
	return x;
}
void Write_d_ds1302(unsigned char x)
{
	unsigned char i,j;
	j=x;
	for(i=0;i<=7;i++)
	{
		if(j&0x01==1) IO_ds1302=1;
		else IO_ds1302=0;
		j=j>>1;
		delay_ds1302_3xns(20);
		SCLK_ds1302=1;
		delay_ds1302_3xns(84);
		SCLK_ds1302=0;
		delay_ds1302_3xns(70);
	}
	IO_ds1302=0;
	REST_ds1302=0;
}