/*******************说明:**************************将实时时钟数据通过LCD1602显示--------------------------------------------------基于51单片机**************************************************/#include <reg52.h>#include <intrins.h>#define uchar unsigned char#define uint unsignedintuchardis_time_buf[16]={0};//LCD1602引脚定义//采用8位并行方式,DB0~DB7连接至LCDDATA0~LCDDATA7sbit RS=P2^0;sbit RW=P2^1;sbit CS=P2^2;#define LCDDATA P0//DS1302引脚定义sbit RST=P1^3;sbit IO=P1^2;sbit SCK=P1^1;//DS1302地址定义#define ds1302_sec_add 0x80 //秒数据地址#define ds1302_min_add 0x82 //分数据地址#define ds1302_hr_add 0x84 //时数据地址#define ds1302_date_add 0x86 //日数据地址#define ds1302_month_add 0x88 //月数据地址#define ds1302_day_add 0x8a //星期数据地址#define ds1302_year_add 0x8c //年数据地址#define ds1302_control_add 0x8e //控制数据地址#define ds1302_charger_add 0x90#define ds1302_clkburst_add 0xbe//初始时间定义uchartime_buf[8] = {0x20,0x10,0x06,0x01,0x23,0x59,0x55,0x02};//初始时间2010年6月1号23点59分55秒星期二//功能:延时1毫秒//入口参数:x//出口参数:无//说明:当晶振为12M时，j<112；当晶振为11.0592M时，j<122voidDelay_xms(uint x){uinti,j;for(i=0;i<x;i++)for(j=0;j<112;j++);}//功能：12us延时//STC89C52为1T单片机,即1个时钟/机器周期,速度为AT89C52的12倍voidDelay_xus(uint t){for(;t>0;t--){_nop_();}}//控制LCD写时序voidLCD_en_write(void){CS=1;Delay_xus(20);CS=0;Delay_xus(20);}//写指令函数voidWrite_Instruction(uchar command){RS=0;RW=0;CS=1;LCDDATA=command;LCD_en_write();//写入指令数据}//写数据函数voidWrite_Data(ucharWdata){RS=1;RW=0;CS=1;LCDDATA=Wdata;LCD_en_write();//写入数据}//字符显示初始地址设置void LCD_SET_XY(ucharX,uchar Y){uchar address;if(Y==0)address=0x80+X;//Y=0,表示在第一行显示，地址基数为0x80elseaddress=0xc0+X;//Y非0时，表时在第二行显示，地址基数为0xC0 Write_Instruction(address);//写指令，设置显示初始地址}//在第X行Y列开始显示Wdata所对应的单个字符voidLCD_write_char(ucharX,ucharY,ucharWdata){LCD_SET_XY(X,Y);//写地址Write_Data(Wdata);//写入当前字符并显示}//清屏函数voidLCD_clear(void){Write_Instruction(0x01);Delay_xms(5);}//显示屏初始化函数voidLCD_init(void){Write_Instruction(0x38); //8bit interface,2line,5*7dotsDelay_xms(5);Write_Instruction(0x38);Delay_xms(5);Write_Instruction(0x38);Write_Instruction(0x08); //关显示，不显光标，光标不闪烁Write_Instruction(0x01); //清屏Delay_xms(5);Write_Instruction(0x04); //写一字符，整屏显示不移动//Write_Instruction(0x05); //写一字符，整屏右移//Write_Instruction(0x06); //写一字符，整屏显示不移动//Write_Instruction(0x07); //写一字符，整屏左移Delay_xms(5);//Write_Instruction(0x0B); //关闭显示（不显示字符，只有背光亮）Write_Instruction(0x0C); //开显示，光标、闪烁都关闭//Write_Instruction(0x0D); //开显示，不显示光标，但光标闪烁//Write_Instruction(0x0E); //开显示，显示光标，但光标不闪烁//Write_Instruction(0x0F); //开显示，光标、闪烁均显示}//DS1302初始化函数void ds1302_init(void){RST=0; //RST脚置低SCK=0; //SCK脚置低}//向DS1302写入一字节数据void ds1302_write_byte(ucharaddr, uchar d){uchari;RST=1; //启动DS1302总线//写入目标地址：addraddr = addr& 0xFE; //最低位置零，寄存器0位为0时写，为1时读for (i = 0; i< 8; i ++) {if (addr& 0x01) {IO=1;}else {IO=0;}SCK=1; //产生时钟SCK=0;addr = addr>> 1;}//写入数据：dfor (i = 0; i< 8; i ++) {if (d & 0x01) {IO=1;}else {IO=0;}SCK=1; //产生时钟SCK=0;d = d >> 1;}RST=0; //停止DS1302总线}//从DS1302读出一字节数据uchar ds1302_read_byte(ucharaddr) {uchari,temp;RST=1; //启动DS1302总线//写入目标地址：addraddr = addr | 0x01; //最低位置高，寄存器0位为0时写，为1时读for (i = 0; i< 8; i ++) {if (addr& 0x01) {IO=1;}else {IO=0;}SCK=1;SCK=0;addr = addr>> 1;}//输出数据：tempfor (i = 0; i< 8; i ++) {temp = temp >> 1;if (IO) {temp |= 0x80;}else {temp&= 0x7F;}SCK=1;SCK=0;}RST=0; //停止DS1302总线return temp;}//向DS302写入时钟数据void ds1302_write_time(void){ds1302_write_byte(ds1302_control_add,0x00); //关闭写保护ds1302_write_byte(ds1302_sec_add,0x80); //暂停时钟//ds1302_write_byte(ds1302_charger_add,0xa9); //涓流充电ds1302_write_byte(ds1302_year_add,time_buf[1]); //年ds1302_write_byte(ds1302_month_add,time_buf[2]); //月ds1302_write_byte(ds1302_date_add,time_buf[3]); //日ds1302_write_byte(ds1302_hr_add,time_buf[4]); //时ds1302_write_byte(ds1302_min_add,time_buf[5]); //分ds1302_write_byte(ds1302_sec_add,time_buf[6]); //秒ds1302_write_byte(ds1302_day_add,time_buf[7]); //周ds1302_write_byte(ds1302_control_add,0x80); //打开写保护}//从DS302读出时钟数据void ds1302_read_time(void){time_buf[1]=ds1302_read_byte(ds1302_year_add); //年time_buf[2]=ds1302_read_byte(ds1302_month_add); //月time_buf[3]=ds1302_read_byte(ds1302_date_add); //日time_buf[4]=ds1302_read_byte(ds1302_hr_add); //时time_buf[5]=ds1302_read_byte(ds1302_min_add); //分time_buf[6]=(ds1302_read_byte(ds1302_sec_add))&0x7f;//秒，屏蔽秒的第7位，避免超出59time_buf[7]=ds1302_read_byte(ds1302_day_add); //周}void Display(void){LCD_write_char(3,0,dis_time_buf[0]+'0');LCD_write_char(4,0,dis_time_buf[1]+'0');LCD_write_char(5,0,dis_time_buf[2]+'0');LCD_write_char(6,0,dis_time_buf[3]+'0');LCD_write_char(7,0,'/');LCD_write_char(8,0,dis_time_buf[4]+'0');LCD_write_char(9,0,dis_time_buf[5]+'0');LCD_write_char(10,0,'/');LCD_write_char(11,0,dis_time_buf[6]+'0');LCD_write_char(12,0,dis_time_buf[7]+'0');LCD_write_char(15,0,dis_time_buf[14]+'0');//第2行显示LCD_write_char(3,1,dis_time_buf[8]+'0');LCD_write_char(4,1,dis_time_buf[9]+'0');LCD_write_char(5,1,':');LCD_write_char(6,1,dis_time_buf[10]+'0');LCD_write_char(7,1,dis_time_buf[11]+'0');LCD_write_char(8,1,':');LCD_write_char(9,1,dis_time_buf[12]+'0');LCD_write_char(10,1,dis_time_buf[13]+'0');}//定时器中断函数void Timer2() interrupt 5 //定时器2是5号中断{staticuchar t;TF2=0;t++;if(t==4) //间隔200ms(50ms*4)读取一次时间{t=0;ds1302_read_time(); //读取时间dis_time_buf[0]=(time_buf[0]>>4); //年dis_time_buf[1]=(time_buf[0]&0x0f);dis_time_buf[2]=(time_buf[1]>>4);dis_time_buf[3]=(time_buf[1]&0x0f);dis_time_buf[4]=(time_buf[2]>>4); //月dis_time_buf[5]=(time_buf[2]&0x0f);dis_time_buf[6]=(time_buf[3]>>4); //日dis_time_buf[7]=(time_buf[3]&0x0f);dis_time_buf[14]=(time_buf[7]&0x07); //星期//第2行显示dis_time_buf[8]=(time_buf[4]>>4); //时dis_time_buf[9]=(time_buf[4]&0x0f);dis_time_buf[10]=(time_buf[5]>>4); //分dis_time_buf[11]=(time_buf[5]&0x0f);dis_time_buf[12]=(time_buf[6]>>4); //秒dis_time_buf[13]=(time_buf[6]&0x0f);}}//定时器2初始化void Init_timer2(void){RCAP2H=0x3c;//赋T2初始值0x3cb0，溢出20次为1秒,每次溢出时间为50ms RCAP2L=0xb0;TR2=1; //启动定时器2ET2=1; //打开定时器2中断EA=1; //打开总中断}//主函数void main(void){Delay_xms(50);//等待系统稳定LCD_init(); //LCD初始化LCD_clear(); //清屏ds1302_init(); //DS1302初始化Delay_xms(10);ds1302_write_time(); //写入初始值Init_timer2(); //定时器2初始化while(1){Display();}}。