ds1302.h

我写的四字点阵

#ifndef __DS1302_H__
#define __DS1302_H__
sbit DS1302_data=P0^2;
sbit DS1302_cs=P0^0;
sbit DS1302_clk=P0^1;
unsigned char display_buffer[6];
void short_delay()
{
	unsigned char i;
	for(i=0;i<5;i++);
}
void long_delay()
{
	unsigned char i;
	for(i=0;i<25;i++);
}
void DS1302_write(unsigned char DS1302_temp)
{
	unsigned char i,temp;
	long_delay();
	temp=DS1302_temp;
	for(i=0;i<8;i++)
	{
		if(temp&0x01)
		DS1302_data=1;
		else
		DS1302_data=0;
		short_delay();
		DS1302_clk=1;
		short_delay();
		DS1302_clk=0;
		short_delay();
		temp=temp>>1;
	}
}
unsigned char DS1302_read(void)
{
	unsigned char i,temp;
	long_delay();
	temp=0;
	for(i=0;i<8;i++)
	{
		temp=temp>>1;
		if(DS1302_data==1)
		temp=temp+0x80;
		DS1302_clk=1;
		short_delay();
		DS1302_clk=0;
		short_delay();
	}
	return temp;
}
void init(void)
{
	unsigned char i;
	DS1302_cs=0;
		DS1302_clk=0;
		short_delay();
		DS1302_cs=1;
		DS1302_write(0x81);
		DS1302_data=1;
		i=DS1302_read();
		DS1302_cs=0;
		short_delay();
		DS1302_clk=1;
		display_buffer[4]=(i>>4)&0x07;
		display_buffer[5]=i&0x0f;

		DS1302_clk=0;
		short_delay();
		DS1302_cs=1;
		DS1302_write(0x83);
		DS1302_data=1;
		i=DS1302_read();
		DS1302_cs=0;
		short_delay();
		DS1302_clk=1;
		display_buffer[2]=(i>>4)&0x07;
		display_buffer[3]=i&0x0f;

		DS1302_clk=0;
		short_delay();
		DS1302_cs=1;
		DS1302_write(0x85);
		DS1302_data=1;
		i=DS1302_read();
		DS1302_cs=0;
		short_delay();
		DS1302_clk=1;
		display_buffer[0]=(i>>4)&0x07;
		display_buffer[1]=i&0x0f;
		

}
#endif