C51 calendar clock program-EEWORLD

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//Program function: calendar, clock, temperature display (temperature measurement code is not included yet, the program will exceed 4k after adding it, pay attention to the chip model selection), temperature sensor uses 18B20
//Calendar and clock, temperature time-sharing switching display, using 8-bit common anode digital tube
//Data output P1, bit code drive P2
//12864LCD display can also be used, the program is not written yet.
#include
#include
#define unchar unsigned char
#define unint unsigned int
unchar code dispcode[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,
                        0Xbf,0x9c,0xc6,0x7f,0xff}; //Digital tube font table, 0-9,-,o,C,.,extinguish
unchar code rili1997code[]={0x2,0x5,0x5,0x1,0x3,0x6,0x1,0x4,0x0,0x2,0X5,0x0}; //Month and week correction codes for the 12 months of 1996
unchar timecnt=19; //Timer interrupt counter
unchar timeadd1=0; //Time plus 1 judgment
unchar newday=0; //Date plus 1 judgment
unchar week; //Week
unchar data date[]={9,12,9};
unchar data time[]={11,59,55};
unchar data wendu[]={14,19,116}; //wendu[0]=10 is negative, display -; wendu[0] =14 is positive, the sign bit is not displayed, Principle reference digital tube font table
                                 //wendu[1] is the integer temperature value, wendu[2]/10 is "°" display, wendu[2]/10+1 displays C, wendu[2]%110 is the temperature value after the decimal point
unchar t=150; //Delay constant
unchar cnt=0; //Display control counter
//#define SSL 0x7f //Second low-order segment code address
//#define SSH 0XBF //Second high-order segment code address
//#define _L 0XDF //8-bit digital tube display, - separator between minutes and seconds
//#define MML 0XEF //The same as below
//#define MMH 0XF7
//#define _H 0XFB //8-bit digital tube display, - separator between hours and minutes
//#define HHL 0XFD
//#define HHH 0XFE
sbit timeset=P3^2; //Time adjustment key
sbit dateset=P3^3; //calendar adjustment key
sbit add=P3^4; //addition adjustment
sbit dec=P3^5; //subtraction adjustment

//Date plus 1 function
//Called when the date has a carry, to determine the maximum value of year, month and day
void dateadd1(unchar i)
{
{ unchar j=0;
switch(i)
{ case 0:if(date[0]==99) //Year is represented by the lower 2 bits
             date[0]=0;
   else
            date[0]++;break;
   case 1:if(date[1]==12)
             date[1]=1;
    else
       date[1]++;break;
   case 2:
         switch(date[1])
        {case 4: //The maximum number of days in April, June, September and November is 30
        case 6:
       case 9:
         case 11:if(date[2]==30)
                         {date[2]=1;
              j++; //j++ means month plus 1, the same below
             }
              else
              {date[2]++; }
               break;
        case 1: //The maximum number of days in January, March, May, July, August, October and December is 31
        case 3:
        case 5:
        case 7:
      case 8:
      case 10:
      case 12: if(date[2]==31)
                             {date[2]=1; j++; }
                   else
                    date[2]++; break;

       case 2:if(date[0]%400==0) //February needs to be judged whether it is a leap year
                          {if(date[2]==29) //A century year that is divisible by 400 is a leap year
                       {date[2]=1; j++; } //A leap year with 29 days in February, add 1 to the month
                     else
                     date[2]++;break;
                     }
                          else
                       {if(date[0]%4==0) //A non-century year that is divisible by 4 is a leap year
                          {if(date[2]==29)
                         {date[2]=1;j++; }
                          else
                          date[2]++; break;
                       }
                     else
                         {if(date[2]==28) //A non-leap year with 28 days in February
                         {date[2]=1;j++;}
                       else
                       date[2]++; break;
                      }
                    }
        default:break;

    }
    if(j)
     { if(date[1]==12) //If the carried month is December, set the month date[1] to 1
          date[1]=1;
    else
       date[1]++;

}
} }

}

void datedec1(unchar i)
{   unchar j=0;
   switch(i)
{ case 0: if(date[0]==0)
              date[0]=99;
     else
           date[0]--;break;
   case 1:if(date[1]==0)
             date[1]=12;
    else
       date[1]--;break;
   case 2:
          switch(date[1])
    { case 4:      //4,6,9,11月的最大天数是30
    case 6:
     case 9:
      case 11:if(date[2]==0)
                          date[2]=30;
           else
              date[2]--;
               break;
      case 1:     //1,3,5,7,8,10,12月的最大天数是31
      case 3:
       case 5:
        case 7:
      case 8:
      case 10:
      case 12: if(date[2]==0)
                             date[2]=31;
                   else
                    date[2]--; break;

       case 2:if(date[0]%400==0) //February needs to be judged whether it is a leap year
                          {if(date[2]==0) //A century year that is divisible by 400 is a leap yeardate
                       [2]=29; //A leap year has 29 days in February, and the month is carried
                     else
                     date[2]--;break;
                     }
                          else
                       {if(date[0]%4==0) //A non-century year that is divisible by 4 is a leap year
                          {if(date[2]==0)
                         date[2]=29;
                          else
                          date[2]--; break;
                       }
                     else
                         {if(date[2]==0) //A non-leap year has 28 days in February
                         date[2]=28;
                       else
                       date[2]--; break;
                      }
                    }
        default:break;

    }

   }
}

void add1(unchar i) //time plus 1 function
{
if(i)
{
     timeadd1--;
     if(time[2]==59) //seconds plus 1
       {time[2]=0;
        time[1]++;
      if(time[1]==60) //minutes plus 1
        {time[1]=0;
         time[0]++;
       if(time[0]==24) //hours plus 1
         { time[0]=0;
     newday++;
    }
   }
  }
else
    time[2]++;
}
//if(newday)
// {
// dateadd1(newday);
// }
}

//Delay function
void delay(unchar x)
{unsigned char i=0;
   while(i i++;
}
//Display function:
//(1) Display time, format: HH(2 digits)-(1 digit)MM(2 digits)(1 digit empty)SS(2 digits)(8 digits in total),
//(2) Display calendar, format: month(2 digits)-(1 digit)day(2 digits)(2 digits empty)week(1 digit),
//(3) Display date (only appears when adjusting the date), format: year-month-day
//(4) Display temperature
//(5) Display process: the first 25 seconds of 30 seconds display time, the last 5 seconds display calendar
void display(unchar x,unchar y,unchar z,unchar r,unchar k)
{ unchar a=150;
   cnt++;
if(cnt==300)
     cnt=0; //Function instructions:
      if(((r!=5)&&(r!=2))||(cnt>a)||(r==6)) //Display function parameters x, y, z, corresponding to the hour, minute, second of the time, or the year, month, day of the date
         {if(r==6)
       P1=dispcode[z/10+1];
    else
       P1 =dispcode[z%10]; //Or display the month, day, week of the calendar, or the positive or negative temperature, temperature, oC.
          P2 =0x7f;//SSL; //k: week control parameter, when displaying the calendar, k=1, the week displays a single digit, when k is other values, it does not affect other display modes
          delay(t); //r: display control parameter, when r takes different values, the item to be adjusted flashes, and only the flashing item can be adjusted using the keyboard.
   if( k!=1) //When r is 0, 1, 2, the corresponding hh, mm, ss will flash and enter adjustment. When r is 3, 4, 5, the corresponding year, month, day will flash and adjust
        {P1=dispcode[z/10]; //When r=6, it is a special way to display temperature
            P2=0xbf;//SSH; //
            delay(t);
      }
   }
    if(((r!=4)&&(r!=1))||(cnt>a)||(r==6))
       { if(r==6)
        P1=dispcode[y%10]-0x80; //Used to display decimal point
    else
        P1 =dispcode[y%10];
          P2=0xef;//MML; //
        delay(t);
    if(r==6) //When the high bit of temperature is 0, it is not displayed
    if(y/10==0)
       P1=dispcode[14];

    P1=dispcode[y/10];
          P2=0xf7;//MMH; //
          delay(t);
          }

if((r==6)||((r!=3)&&(r!=0))||(cnt>a))
      {if(r==6)
      P1=0XFF;
    else
       P1 =dispcode[x%10];
     P2=0xfd;//HHL;
           delay(t);
    if(r==6)
       P1=0XFF;
    else
            P1=dispcode[x/10];
         P2=0xfe;//HHH;
         delay(t);
          }

    if((r==6)||(cnt>a)) //r=6 can be used for temperature measurement display control
        {if(r==6)
     P1=dispcode[wendu[0]];
   else
     P1 =dispcode[10];//dispcode[y%10];
         P2=0xfb;//_H;
         delay(t);
   }
   if(r==6)
   {P1=dispcode[wendu[2]%110];
    P2=0xdf;
    delay(t);
   }

}

void keyscan()       //键盘扫描函数,用于扫描P3.2(timeset),P3.3(dateset),P3.4(add),P3.5(dec)键是否按下
{ unchar i=0,j=0;
if(dateset==0)
     {display(date[0],date[1],date[2],8,0);       //延时
      if(dateset==0)
      while(i<3)
    {   display(date[0],date[1],date[2],i,0);
      if(add==0)
        {display(date[0],date[1],date[2],i,0);
         if(add==0)
         dateadd1(i);
      display(date[0],date[1],date[2],i,0);
      display(date[0],date[1],date[2],i,0);
      display(date[0],date[1],date[2],i,0);
      display(date[0],date[1],date[2],i,0);
      }
      if(dec==0)
      {display(date[0],date[1],date[2],i,0);

       if(dec==0)
       datedec1(i);
       display(date[0],date[1],date[2],i,0);
       display(date[0],date[1],date[2],i,0);
       display(date[0],date[1],date[2],i,0);
       display(date[0],date[1],date[2],i,0);
      }
      if(dateset==0)
         {display(date[0],date[1],date[2],i,0);
          if(dateset==0)
        i++;
     display(date[0],date[1],date[2],i,0);
     display(date[0],date[1],date[2],i,0);
     display(date[0],date[1],date[2],i,0);
     display(date[0],date[1],date[2],i,0);
      }

     }
   }

if(timeset==0)
     {delay(100);       //短暂延时
      if(timeset==0)
      delay(100);

        while(j<3)
      { display(time[0],time[1],time[2],j,0);
      if(add==0)
        {delay(200);
         if(add==0)
        { //delay(200);
     switch(j)
        {case 0:if(time[0]==24)
                  time[0]=0;
        else
         time[0]++;break;
         display(time[0],time[1],time[2],j,0);
      case 1:
      case 2:if(time[j]==60)
                time[j]=0;
        else
           time[j]++;
      default:break;
      } //delay(100);
     // display(time[0],time[1],time[2],j,0);
         }
        }
      if(dec==0)
      {delay(200);
       if(dec==0)
       switch(j)
       {case 0:if(time[0]==0)
                  time[0]=23;
        else
         time[0]--;break;
         display(time[0],time[1],time[2],j,0);
           case 1:
      case 2:if(time[j]==0)
                time[j]=59;
        else
           time[j]--;
           display(time[0],time[1],time[2],j,0);
      default:break;
     } delay(100);
      }
      if(timeset==0)
         {
         display(time[0],time[1],time[2],j,0);
         //display(time[0],time[1],time[2],j,0);
          if(timeset==0)
        j++;
      }

     }

    }
}

void datetoweek(unchar x,unchar y,unchar z,unchar p) //Calculate the day of the week for the specified date, x, y, z are year, month, day respectively;
{if(p)
{ int year;
year=1997+x+3;
dateadd1(2);
newday--;

if((year%400)==0) //p is the condition for whether to execute the function, that is, the variable newday (generated by the carry of hh),
   {if(y<3) //When hh has no carry, newday=0, do not execute the function
         {unchar i,j; //Date plus 1, calendar adjustment
      j=rili1997code[y-1];
      i=(((year-1997)/4+(year-1997)+j)-1);
      week=(z+i+1)%7; //
       }
       else
       {unchar i,j;
        j=rili1997code[y-1];
         i=(((year-1997)/4+(year-1997)+j));
         week=(z+i+1)%7;
          }
   }
else
      { if(year%4==0)
     {if(y<3)
          {unchar i,j;
           j=rili1997code[y-1];
           i=(((year-1997)/4+(year-1997)+j)-1);
           week=(z+i+1)%7;
           }
            else
           {unchar i,j      ;
            1997code[y-1             ] ;
            i=(((year-1997)/4+(year-1997)+j))     ;             week     =             (z+i+1)%
            7 ;
              }
     }
  }       }

void displaycontrol() //Display control function
{
if(time[2]%30<=20) //The first 25 seconds of 30 seconds display time, and the last 5 seconds display calendardisplay
   (time[0],time[1],time[2],7,0);
//if((time[2]%30<=25)&&(time[2]%30>20))
else
    if(time[2]%30<=25)
    display(date[1],date[2],week,8,1);
// if((time[2]%30<=30)&&(time[2]%30>25))
     else
       display(wendu[0],wendu[1],wendu[2],6,0);
}

void main(void) // Main function
{

TMOD=0x01;
TH0=((65535-50000)/256); //Assign initial value to timer
TL0=((65535-50000)%256);
ET0=1;
EA=1;
TR0=1;
while(1)
    {
    keyscan(); //Keyboard scan
add1(timeadd1); //Add 1
    datetoweek(date[0],date[1],date[2],newday);
    displaycontrol(); //Time, calendar, temperature, etc. display control
    }
}

void t0 (void)interrupt 1 using 0 //Timer interrupt function
{

TH0+=((65536-50000)/256);
TL0+=((65536-50000)%256);
timecnt--;
if ( timecnt == 0 )
{ timecnt = 19 ;
timeadd1++;
}
} }

Keywords：c51 Reference address：C51 calendar clock program

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