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- #include <reg51.h>
- #include <string.h>
- #define uchar unsigned char
- #define uint unsigned int
- sbit SDA=P1^0; //DS1302 数据线
- sbit CLK=P1^1; //DSB1302 时钟线
- sbit RST=P1^2; //DS1302 复位线
- sbit RS=P2^0; //LCD 寄存器选择
- sbit RW=P2^1; //LCD 读/写控制
- sbit EN=P2^2; //LCD 启用
- sbit K1=P3^4; //选择
- sbit K2=P3^5; //加
- sbit K3=P3^6; //减
- sbit K4=P3^7; //确定
- uchar tCount=0;
- uchar dat; //定义参数
- //一年中每个月的天数,二月的天数由年份决定
- uchar MonthsDays[]={31,0,31,30,31,30,31,31,30,31,30,31};
- //周日,周一到周六{0,1-6} [读取 DS1302 时分别是 1-7]
- uchar *WEEK[]={"SUN","MON","TUS","WEN","THU","FRI","SAT"};
- //LCD 显示缓冲
- uchar LCD_DSY_BUFFER1[]={"0019 00-00-00 "};
- uchar LCD_DSY_BUFFER2[]={"HWW 00:00:00 "};
- uchar DateTime[7]; //所读取的日期时间
- char Adjust_Index=-1;//当前调节的时间对象:秒,分,时,日,月,年(0,1,2,3,4,6)
- uchar Change_Flag[]="-MHDM-Y";
- //(分,时,日,月,年) (不调节秒周)
- //延时,向 DS1302 写、读一字节以及从 DS1302 指定位置度、写数据的程序
- //延时---------------------------------------------------
- void DelayMS(uint x)
- {
- uchar i;
- while(x--) for(i=0;i<120;i++);
- }
- //向 DS1302 写入一个字节
- void Write_A_Byte_TO_DS1302(uchar x)
- {
- uchar i;
- for(i=0;i<8;i++)
- {
- SDA=x&1;CLK=1; CLK=0; x>>=1;
- }
- }
- //从 DA1302 读取一字节---------------------------------------
- uchar Get_A_Byte_FROM_DS1302()
- {
- uchar i,b,t;
- for(i=0;i<8;i++)
- {
- b>>=1; t=SDA;b|=t<<7;CLK=1;CLK=0;
- }
- //BCD 码转换
- return b/16*10+b%16;
- }
- //从 DS1302 指定的位置读数据--------------------------------------
- uchar Read_Data(uchar addr)
- {
- uchar dat;
- RST=0;CLK=0;RST=1;
- Write_A_Byte_TO_DS1302(addr);
- dat=Get_A_Byte_FROM_DS1302();
- CLK=1;RST=0;
- return dat;
- }
- // 向 DS1302 某地址写入数据-------------------------------------------
- void Write_DS1302(uchar addr,uchar dat)
- {
- CLK=0;RST=1;
- Write_A_Byte_TO_DS1302(addr);
- Write_A_Byte_TO_DS1302(dat);
- CLK=0;RST=0;
- }
- //-------------------------------------------
- //------设置时间-------------------------------------
- void SET_DS1302()
- {
- uchar i;
- Write_DS1302(0x8E,0x00); //写控制字,取消写保护
- for(i=1;i<7;i++) //分时日月年依次写入
- {
- //分的起始地址 10000010(0x82),后面续依次是时.日.月.周.年.写入地址每次递增 2
- Write_DS1302(0x80+ 2*i,(DateTime[i]/10<<4)|(DateTime[i]%10)); }
- Write_DS1302(0x8E,0x80);//加保护
- }
- //---------------------------------------------------
- //读取当前日期时间
- //---------------------------------------------------
- void GetTime()
- {
- uchar i;
- for(i=0;i<7;i++)
- {
- DateTime[i]=Read_Data(0x81+2*i);
- }
- }
- //---------------------------------------------------
- //1602LCD 的若干显示控制代码
- //uchar Read_LCD_State() 读 LCD 状态
- uchar Read_LCD_State()
- {
- uchar state;
- RS=0;RW=1;EN=1;DelayMS(1);state=P0;EN=0;DelayMS(1);
- return state;
- }
- //void LCD_Busy_Wait() 忙等待
- void LCD_Busy_Wait()
- {
- while((Read_LCD_State()&0x80)==0x80);
- DelayMS(5);
- }
- //void Write_LCD_Data(uchar dat) 向 LCD 写数据
- void Write_LCD_Data(uchar dat)
- {
- LCD_Busy_Wait();
- RS=1;RW=0;EN=0;P0=dat;EN=1;DelayMS(1);EN=0;
- }
- //void Write_LCD_Command(uchar cmd) 写 LCD 指令
- void Write_LCD_Command(uchar cmd)
- {
- LCD_Busy_Wait();
- RS=0;RW=0;EN=0;P0=cmd;EN=1;DelayMS(1);EN=0;
- }
- // Void Init_LCD() LCD 初始化
- void Init_LCD()
- {
- Write_LCD_Command(0x38);DelayMS(1);
- Write_LCD_Command(0x01);DelayMS(1);
- Write_LCD_Command(0x06);DelayMS(1);
- Write_LCD_Command(0x0c);DelayMS(1);
- }
- //void Set_LCD_POS(uchar P) 设置液晶显示位置
- void Set_LCD_POS(uchar p)
- {
- Write_LCD_Command(p|0x80);
- }
- //------------------------------------------------------
- //在 LCD 上显示字符串
- void Display_LCD_String(uchar p,uchar *s)
- {
- uchar i;
- Set_LCD_POS(p);
- for(i=0;i<16;i++)
- {
- Write_LCD_Data(s[i]); DelayMS(1);
- }
- }
- //-----------------------------------------------------------
- //日期与时间值转换为数字字符
- void Format_DateTime(uchar d,uchar *a)
- {
- a[0]=d/10+'0';a[1]=d%10+'0';
- }
- //----------------------------------------------------------
- //判断是否为闰年
- uchar isLeapYear(uint y)
- {
- return(y%4==0&y%100!=0)||(y%400==0);
- }
- //-----------------------------------------------------------
- //求自 2000.1.1 开始的任何一天是星期几
- //函数没有通过,求出总天数后再求星期几
- //因为求总天数可能会超越 uint 的范围
- void RefreshWeekDay()
- {
- uint i,d,w=5;
- //已知 1999.12.31 是周五
- for(i=2000;i<2000+DateTime[6];i++)
- {
- d=isLeapYear(i)?366:365;
- w=(w+d)%7;
- }
- d=0;
- for(i=1;i<DateTime[4];i++) d+=MonthsDays[i];
- d+=DateTime[3];
- //保存星期,0~6 表示星期日至周六,为了与DS1302 的星期格式匹配,返回值需要加 1 DateTime[5]=(w+d)%7+1;
- }
- //----------------------------------------------------------
- void DateTime_Adjust(char x)
- {
- switch(Adjust_Index)
- {
- case 6://年 00-99
- if(x==1&DateTime[6]<99) DateTime[6]++;
- if(x==-1&DateTime[6]>0) DateTime[6]--;
- //获取 2 月天数
- MonthsDays[2]=isLeapYear(2000+DateTime[6])?29:28;
- //如果年份变化后当前月份的天数大于上限则设为上限
- if(DateTime[3]>MonthsDays[DateTime[4]])
- DateTime[3]=MonthsDays[DateTime[4]]; RefreshWeekDay();
- //刷新星期
- break;
- case 4:
- //月 01-12
- if(x==1&DateTime[4]<12) DateTime[4]++;
- if(x==-1&DateTime[4]>1) DateTime[4]--;
- //获取 2 月天数
- MonthsDays[2]=isLeapYear(2000+DateTime[6])?29:28;
- //如果月份变化后当前月份的天数大于上限则设为上限
- if(DateTime[3]>MonthsDays[DateTime[4]])
- DateTime[3]=MonthsDays[DateTime[4]];
- RefreshWeekDay();
- //刷新星期
- break;
- case 3://日00-28/29/30/31;调节之前首先根据年份得出该年中2月的天数
- MonthsDays[2]=isLeapYear(2000+DateTime[6])?29:28;
- //根据当前月份决定调节日期的上限
- if(x==1&DateTime[3]<MonthsDays[DateTime[4]]) DateTime[3]++;
- if(x==-1&DateTime[3]>0) DateTime[3]--;
- RefreshWeekDay();//刷新星期
- break;
- case 2://时
- if(x==1&DateTime[2]<23) DateTime[2]++;
- if(x==-1&DateTime[2]>0) DateTime[2]--;
- break;
- case 1://分
- if(x==1&DateTime[1]<59) DateTime[1]++;
- if(x==-1&DateTime[1]>0) DateTime[1]--;
- break;
- }
- }
- //---------------------------------------------------------
- //定时器 0 每秒刷新 LCD 显示
- void T0_INT() interrupt 1
- {
- TH0=-50000/256;
- TL0=-50000%256;
- if(++tCount!=2) return;
- tCount=0;
- //按指定的格式生成待显示的日期时间串
- Format_DateTime(DateTime[6],LCD_DSY_BUFFER1+5);
- Format_DateTime(DateTime[4],LCD_DSY_BUFFER1+8);
- Format_DateTime(DateTime[3],LCD_DSY_BUFFER1+11);
- //星期 strcpy(LCD_DSY_BUFFER1+13,WEEK[DateTime[5]-1]);
- //时分秒
- Format_DateTime(DateTime[2],LCD_DSY_BUFFER2+5);
- Format_DateTime(DateTime[1],LCD_DSY_BUFFER2+8);
- Format_DateTime(DateTime[0],LCD_DSY_BUFFER2+11);
- //显示年月日,星期,时分秒
- Display_LCD_String(0x00,LCD_DSY_BUFFER1);
- Display_LCD_String(0x40,LCD_DSY_BUFFER2);
- }
- //---键盘中断(INT0)-----------------------------------------
- void EX_INT0() interrupt 0
- {
- if(K1==0) //选择调整对象(Y M D H M)
- {
- while(K1==0);
- if(Adjust_Index==-1||Adjust_Index==1) Adjust_Index=7;
- Adjust_Index--;
- if(Adjust_Index==5) Adjust_Index=4;//跳过对星期的调节
- LCD_DSY_BUFFER2[13]='[';
- LCD_DSY_BUFFER2[14]=Change_Flag[Adjust_Index];
- LCD_DSY_BUFFER2[15]=']';
- }
- else if(K2==0)//加
- {
- while(K2==0); DateTime_Adjust(1);
- }
- else if(K3==0)//减
- {
- while(K3==0); DateTime_Adjust(-1);
- }
- else if(K4==0)//确定
- {
- while(K4==0); SET_DS1302(); //将调整后的时间写入 1302
- LCD_DSY_BUFFER2[13]=' ';
- LCD_DSY_BUFFER2[14]=' ';
- LCD_DSY_BUFFER2[15]=' ';
- Adjust_Index=-1;
- //操作索引重设为-1,时间继续正常显示
- }
- }
- //---------------------------------------------------------------
- //主程序 void main()
- void main()
- {
- Init_LCD();//液晶初始化
- IE=0x83; //允许INT0,T0中断
- IP=0x01;
- IT0=0x01;
- TMOD=0x01;
- TH0=-50000/256;
- TL0=-50000%256;
- TR0=1;
- while(1)
- {
- //如果为执行调整操作则正常读取当前时间
- if(Adjust_Index==-1) GetTime();
- }
- }
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