ds1302.c

一个数字显示时钟的程序

#include "regx52.h"
#include "lcd1602.h"

#define DS_RST P2_5
#define DS_IO P2_7
#define DS_CLK P2_6

unsigned char Time[7]={0x00,0x00,0x00,0x01,0x01,0x01,0x08};
unsigned char Temp_Buffer[2];

void DS_Open(void)
{
	DS_CLK=0;
	DS_RST=1;
}

void DS_Close(void)
{
	DS_RST=0;
	DS_CLK=0;
}

void DS_Write_Byte(unsigned char dat)
{
	unsigned char i;
	for(i=0;i<8;i++)
	{
		if(dat&0x01)
		{
			DS_IO=1;
		}
		else
		{
			DS_IO=0;
		}
		DS_CLK=1;
		_nop_();
		_nop_();
		DS_CLK=0;
		dat>>=1;
	}
	DS_IO=1;
}

unsigned char DS_Read_Byte(void)
{
	unsigned char i,r_dat;
	for(i=0;i<8;i++)
	{
		r_dat>>=1;
		if(DS_IO)
		{
			r_dat+=0x80;
		}
		DS_CLK=1;
		_nop_();
		_nop_();
		DS_CLK=0;
	}
	return r_dat;
}

void DS_Get_Time(unsigned char *p)
{
	unsigned char i;
	DS_Open();
	DS_Write_Byte(0xbf);
	DS_Close();
	DS_Open();
	DS_Write_Byte(0xbf);
	for(i=0;i<7;i++)
	{
		p[i]=DS_Read_Byte();
	}
	DS_Close();
}

void DS_Set_Time(unsigned char *p)
{
	unsigned char i;
	p[0]&=0x7f;
	DS_Open();
	DS_Write_Byte(0xbe);
	for(i=0;i<7;i++)
	{
		DS_Write_Byte(p[i]);
	}
	DS_Write_Byte(0x00);
	DS_Close();
}

void DS_Initial(void)
{
	unsigned char dat;
	DS_RST=0;
	DS_Open();
	DS_Write_Byte(0x8e);
	DS_Write_Byte(0x00);
	DS_Close();
	
	DS_Open();
	DS_Write_Byte(0x81);
	dat=DS_Read_Byte();
	DS_Close();

	dat&=0x7f;

	DS_Open();
	DS_Write_Byte(0x80);
	DS_Write_Byte(dat);
	DS_Close();

	DS_Open();
	DS_Write_Byte(0x90);
	DS_Write_Byte(0xa5);
	DS_Close();

	DS_Open();
	DS_Write_Byte(0x8e);
	DS_Write_Byte(0x80);
	DS_Close();
}

void Change_To_Char(unsigned int t,unsigned char *str)
{
	unsigned char a[2]; 
	char i, j;                                 	         	
	a[0]=(t/10)%10;                                         	
	a[1]=t%10;                                      	                                 	                                     	                                                     
	for(i=0; i<2; i++)                      	
		a[i]=a[i]+'0';                                    	
	for(i=0; (a[i]=='0')&&(i<2); i++)                     
		{
			;
		}                     	
	for(j=0; j<i; j++)                       	
		{ 	
			*str='0';  
			str++; 
		}                             	
	for(; i<2; i++)                                       	
		{ 
			*str=a[i]; 
			str++; 
		}     
		
	*str='\0'; 
}

void Delay(void)
{
	unsigned char i,j;
	for(i=0;i<224;i++)
		for(j=0;j<224;j++)
			;
}

void main(void)
{	
	unsigned char ii;
	unsigned char year;
	Lcd_Initial();
	DS_Initial();
	Gotoxy(0,0);
	Print("    /  /        ");
	Gotoxy(0,1);
	Print("  :             ");
	DS_Set_Time(&Time[0]);
	while(1)
	{
		year=20;
		DS_Get_Time(&Time[0]);
		ii=Time[1]&0x0f;
		Time[1]>>=4;
		Time[1]&=0x07;
		Time[1]=Time[1]*10+ii;			
		Change_To_Char(Time[1],&Temp_Buffer[0]);
		Gotoxy(3,1);
		Print(&Temp_Buffer[0]);
		
		if(Time[2]&&0x80)
		{
			if(Time[2]&&0x20)
			{
				Gotoxy(5,1);
				Print("(AM)");
			}
			else
			{
				Gotoxy(5,1);
				Print("(PM)");
			}
		}
		else
		{
			Gotoxy(5,1);
			Print("(24th)");
			ii=Time[2]&0x0f;
			Time[2]>>=4;
			Time[2]&=0x03;
			Time[2]=Time[2]*10+ii;
			Change_To_Char(Time[2],&Temp_Buffer[0]);
			Gotoxy(0,1);
			Print(&Temp_Buffer[0]);
		}

		ii=Time[3]&0x0f;
		Time[3]>>=4;
		Time[3]&=0x03;
		Time[3]=Time[3]*10+ii;
		Change_To_Char(Time[3],&Temp_Buffer[0]);
		Gotoxy(8,0);
		Print(&Temp_Buffer[0]);

		ii=Time[4]&0x0f;
		Time[4]>>=4;
		Time[4]&=0x01;
		Time[4]=Time[4]*10+ii;
		Change_To_Char(Time[4],&Temp_Buffer[0]);
		Gotoxy(5,0);
		Print(&Temp_Buffer[0]);
		
		ii=Time[6]&0x0f;
		Time[6]>>=4;
		Time[6]&=0x0f;
		Time[6]=Time[6]*10+ii;
		Change_To_Char(Time[6],&Temp_Buffer[0]);
		Gotoxy(2,0);
		Print(&Temp_Buffer[0]);
		Change_To_Char(year,&Temp_Buffer[0]);
		Gotoxy(0,0);
		Print(&Temp_Buffer[0]);

		ii=Time[5]&0x07;
		Gotoxy(12,1);
		switch(ii)
		{
			case 0x01: Print("Mon"); break;
			case 0x02: Print("Tue"); break;
			case 0x03: Print("Wen"); break;
			case 0x04: Print("Tue"); break;
			case 0x05: Print("Fir"); break;
			case 0x06: Print("Sat"); break;
			case 0x07: Print("Sun"); break;
			default: break;
		}
		Delay();
	}
}