用AT89C51与DS1302做的万年历c语言编程

//写的时候，是低电平改变数据，上升沿送入数据//读的时候，是低电平读入数据，下降沿使得从设备把数据放到总线上//读的时候，是低电平读，但没有读出，提供下降沿使得从设备把数据放到总线上#include<reg51.h>#include<intrins.h>#define uchar unsigned char#define uint unsigned intsbit rs=P2^4;sbit rw=P2^5;sbit en=P3^6;sbit reset=P3^3;sbit sclk=P3^0;sbit io=P3^1;uchar str1[]="date of today is:";uchar init[]={0x00,0x00,0x21,0x21,0x10,0x01,0x04};//秒，分，时，日，月，星期，年//void delay(){uchar j;for(j=250;j>0;j--);}//-------------------液晶模块-----------------//void en_toggle(){en=0;//_nop_();delay();en=1;delay();// _nop_();en=0;} //注意必须加延时，否则会出问题的void is_ready(){P2=0x00;//设置为输入口 //注意：现实中应该送0xffrs=0;rw=1;en=1;while(bflag);en=0;}void write_cmd(uchar cmd){is_ready();rs=0;rw=0;P2=cmd;en_toggle();_nop_();}void write_data(uchar indata){is_ready();rs=1;rw=0;P2=indata;en_toggle();_nop_();}void write_str(uchar addr,uchar *p){uchar i;write_cmd(addr);while(p[i]!='\0'){write_data(p[i]);i++;}}void write_position(uchar row,uchar col) {uchar p;if(row==1){p=0x80+col-1;write_cmd(p);}else{p=0xc0+col-1;write_cmd(p);}}void init_lcd(){write_cmd(0x38);write_cmd(0x0c);write_cmd(0x06);write_cmd(0x01);//清屏幕}//------------液晶模块结束---------------------//-----------ds1302模块开始-------------------//注意点：sclk的上升沿输入数据，sclk的下跳沿输出数据//读写时都是从第0位开始void write_byte(uchar inbyte){uchar i;for(i=8;i>0;i--){sclk=0; //写的时候低电平改变数据if(inbyte&0x01)io=1;elseio=0;sclk=1; //写的时候高电平，把数据写入ds1302_nop_();inbyte=inbyte>>1;}}uchar read_byte() //sclk的下跳沿读数据{uchar i,temp=0;io=1; //设置为输入口for(i=7;i>0;i--){sclk=0;if(io==1)temp=temp|0x80;elsetemp=temp&0x7f;sclk=1; //产生下跳沿temp=temp>>1;}return (temp);}//----------往ds1302的某个地址写入数据------------- void write_ds1302(uchar cmd,uchar indata){reset=1;write_byte(cmd);write_byte(indata);reset=0;sclk=0;}//----------读ds1302某地址的的数据----------------- uchar read_ds1302(uchar addr){uchar backdata;reset=1;write_byte(addr);backdata=read_byte();//先写地址，然后读数据reset=0;sclk=0;return (backdata);}//------------设置初始时间-------------------void set_ds1302(uchar addr,uchar *p,uchar n)//写入n个数据{write_ds1302(0x8e,0x00);//写控制字，允许写操作for(;n>0;n--){write_ds1302(addr,*p);p++;addr=addr+2;}write_ds1302(0x8e,0x80);//写保护，不允许写}//----------- 读取当前时间-------------------void read_nowtime(uchar addr,uchar *p,uchar n){for(;n>0;n--){*p=read_ds1302(addr);p++;addr=addr+2;}}void init_ds1302(){reset=0;sclk=0;write_ds1302(0x80,0x00);//写控制字，允许写write_ds1302(0x90,0x00);//禁止涡流充电}//-----------ds1302模块结束-------------------void main(){init_lcd(); //初始化LCDwrite_str(0x80,str1); //液晶显示提示信息init_ds1302(); //初始化ds1302set_ds1302(0x80,init,7);//设置初始时间，日期，年月//如果不设置初始化时间的话，则默认为系统时间while(1){read_nowtime(0x81,init,7); //读出当前时间，读出7个字节write_position(2,1);write_data('0'+((init[2]&0xf0)>>4));write_position(2,2);write_data('0'+(init[2]&0x0f)); //读小时write_position(2,3);write_data(':');write_position(2,4);write_data('0'+((init[1]&0xf0)>>4));write_position(2,5);write_data('0'+(init[1]&0x0f)); //读分钟write_position(2,6);write_data(':');write_position(2,7);write_data('0'+((init[0]&0xf0)>>4));write_position(2,8);write_data('0'+(init[0]&0x0f)); //读秒write_position(2,13);write_data('0'+((init[6]&0xf0)>>4));write_position(2,14);write_data('0'+(init[6]&0x0f)); //读年write_position(2,15);write_data('/');write_position(2,16);write_data('0'+((init[4]&0xf0)>>4));write_position(2,17);write_data('0'+(init[4]&0x0f)); //读月write_position(2,18);write_data('/');write_position(2,19);write_data('0'+((init[3]&0xf0)>>4));write_position(2,20);write_data('0'+(init[3]&0x0f)); //读日。