ds1307.c

一个基于51单片机的定时报警设计电路及程序

#include <reg52.h>
#include <intrins.h>

sbit SCL=P1^0;
sbit SDA=P1^1;
#define ACK 0
#define NACK 1
#define WRITE 0xd0
#define READ  0xd1
unsigned char dispbuf[7];
unsigned char code zimo[16]={0xc0,0xf9,0xa4,0xb0,	// 0, 1, 2, 3
				0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};// 4, 5, 6, 7, 8, 9
unsigned char code disflag[6]={0x20,0x10,0x08,0x04,0x02,0x01};
unsigned char led_buf[6];
unsigned char n,flag;
unsigned char Sec, Min, Hrs;

void delayms(unsigned char ms)	
// 延时子程序
{
	unsigned char i;
	while(ms--)
	{
		for(i = 0; i < 120; i++);
	}
}
//I2C启始标志
void I2c_start(void)
{
	SDA = 1;
	SCL = 1;
	_nop_();
	_nop_();
	SDA = 0;
	_nop_();
	_nop_();
	SCL = 0;
	_nop_();
}
//I2C停止标志
void I2c_stop(void)
{
	SDA = 0;
	_nop_();
	_nop_();
	SCL = 1;
	_nop_();
	_nop_();
	_nop_();
	_nop_();
	SDA = 1;
	_nop_();
}

unsigned char I2c_read(unsigned char ack)
{
	unsigned char i,read_data;
	for(i = 0; i < 8; i++)
	{
		SCL = 1;
		_nop_();
		read_data <<= 1;
		read_data |= (unsigned char)SDA;
		SCL = 0;
		_nop_();
	}
	_nop_();
	SCL = 0;
	if(ack == NACK) SDA = 1; /* sda = 1 if next cycle is reset */
	else
		SDA=0;
	_nop_();
	SCL = 1;
	_nop_();
	SCL = 0;
	_nop_();
	SDA = 1;
	_nop_();
	return(read_data);
}

void I2c_write(unsigned char write_data)
{
	unsigned char i;
	bit ack_bit;
	for(i = 0; i < 8; i++)		// 循环移入8个位
	{
		SDA = (bit)(write_data & 0x80);
		SCL = 1;
		_nop_();
		_nop_();
		SCL = 0;
		_nop_();
		_nop_();
		write_data <<= 1;
	}
	SDA = 1;			// 读取应答
	_nop_();
	_nop_();
	SCL = 1;
	_nop_();
	_nop_();
	SCL = 0;
	_nop_();
	_nop_();
	ack_bit = SDA;
}

void Init_Rtc(unsigned char sec,unsigned char min,unsigned char hour)
{
	I2c_start(); 
	I2c_write(WRITE); 
	I2c_write(0x00); 
	I2c_write(sec); 
	I2c_write(min);
	I2c_write(hour);
	I2c_stop();
	delayms(10);
}
void Read_time(void)
{
	I2c_start();
	I2c_write(WRITE); 
	I2c_write(0x00); 
	I2c_start();
	I2c_write(READ);
	Sec = I2c_read(ACK);
	Min = I2c_read(ACK);
	Hrs = I2c_read(NACK);
	I2c_stop();	
	delayms(10);	
}
void disp_time(void)
{
	unsigned char disp_temp[3];
		unsigned char temp_h,temp_l,i,j;
		Read_time();
		disp_temp[0]=Sec;
		disp_temp[1]=Min;
		disp_temp[2]=Hrs;
			do
			{
				temp_h=(disp_temp[j]&0xf0)>>4;
				temp_l=disp_temp[j]&0x0f;
				led_buf[i]=zimo[temp_l];
				i++;
				led_buf[i]=zimo[temp_h];
				i++;
				j++;
			}while(j<3);
			j=0;
			i=0;
}
int main()
{
//	unsigned char disp_temp[3];
//	unsigned char temp_h,temp_l,i,j;
	P0 = 0xff;
	P2 = 0xff;
	TMOD = 0x01;
	TH0 = 0xfe;
	TL0 = 0x0c;
	IE = 0x82;
	flag=0;
	n=0;
/*	I2c_start(); 
	I2c_write(WRITE); 
	I2c_write(0x00); 
	I2c_write(0x00);
	I2c_stop();*/
	Init_Rtc(0x00,0x50,0x03);
	TR0=1;
	while(1)
	{
/*		Read_time();
		disp_temp[0]=Sec;
		disp_temp[1]=Min;
		disp_temp[2]=Hrs;
			do
			{
				temp_h=(disp_temp[j]&0xf0)>>4;
				temp_l=disp_temp[j]&0x0f;
				led_buf[i]=zimo[temp_l];
				i++;
				led_buf[i]=zimo[temp_h];
				i++;
				j++;
			}while(j<3);
			j=0;
			i=0;*/
		 disp_time();
	}
}

void timer0(void) interrupt 1
{
	TH0=0xfe;
	TL0=0x0c;
//	KeyDelaytime++;
	if(flag<7)
	{
		P0=led_buf[n];
		P2=disflag[n];
	 }
	else
	{
		P2=0x00;
		P0=0;
	 }
	 flag++;
	 if(flag==8)
	 {
		n++;
		if(n==6)
		{
			n=0;
		}
		flag=0;
	}
}