/*******************说明:**************************将实时时钟数据通过LCD1602显示--------------------------------------------------基于DS1302**************************************************/#include #include #define uchar unsigned char#define uint unsigned intuchar dis_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uchar time_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<122void Delay_xms(uint x){ uint i,j; for(i=0;i0;t--) { _nop_(); }}//控制LCD写时序void LCD_en_write(void) { CS=1; Delay_xus(20); CS=0; Delay_xus(20);} //写指令函数void Write_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void Write_Data(uchar Wdata){ 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(uchar X,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0x80 else address=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void LCD_write_char(uchar X,uchar Y,uchar Wdata){ LCD_SET_XY(X,Y);//写地址 Write_Data(Wdata);//写入当前字符并显示}//清屏函数void LCD_clear(void){ Write_Instruction(0x01); Delay_xms(5);}//显示屏初始化函数void LCD_init(void) { Write_Instruction(0x38); //8bit interface,2line,5*7dots Delay_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(uchar addr, uchar d) { uchar i; RST=1; //启动DS1302总线 //写入目标地址：addr addr = 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：d for (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(uchar addr) { uchar i,temp; RST=1; //启动DS1302总线 //写入目标地址：addr addr = 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：temp for (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59 time_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{ static uchar 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2 ET2=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(); }}
