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How to convert Digital LCD Clock to 7 Segment Digital Clock ? C Code Programming

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Hello,

I have one LCD Clock using DS1307 + PIC16F877A. But now i just want to use only Time and want to transfer data to 7 Segment Multiplexed 4 Display. So can anyone help me regarding changes made to the C Code ? i know about multiplexing 7 Segments using pic. i just need to transfer only time to 4 7-Segment multiplexed display..so m confused.... because output from DS1307 to the microntroller is i2C and from microcontroller its BCD....

i just need to display only time on the 7 segment display...


C Code :

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// LCD module connections
sbit LCD_RS at RB2_bit;
sbit LCD_EN at RB3_bit;
sbit LCD_D4 at RB4_bit;
sbit LCD_D5 at RB5_bit;
sbit LCD_D6 at RB6_bit;
sbit LCD_D7 at RB7_bit;
 
sbit LCD_RS_Direction at TRISB2_bit;
sbit LCD_EN_Direction at TRISB3_bit;
sbit LCD_D4_Direction at TRISB4_bit;
sbit LCD_D5_Direction at TRISB5_bit;
sbit LCD_D6_Direction at TRISB6_bit;
sbit LCD_D7_Direction at TRISB7_bit;
// End LCD module connections
 
 
 
unsigned short read_ds1307(unsigned short address)
{
  unsigned short r_data;
  I2C1_Start();
  I2C1_Wr(0xD0); //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 --> 0xD0
  I2C1_Wr(address);
  I2C1_Repeated_Start();
  I2C1_Wr(0xD1); //0x68 followed by 1 --> 0xD1
  r_data=I2C1_Rd(0);
  I2C1_Stop();
  return(r_data);
}
 
 
void write_ds1307(unsigned short address,unsigned short w_data)
{
  I2C1_Start(); // issue I2C start signal
  //address 0x68 followed by direction bit (0 for write, 1 for read) 0x68 followed by 0 --> 0xD0
  I2C1_Wr(0xD0); // send byte via I2C (device address + W)
  I2C1_Wr(address); // send byte (address of DS1307 location)
  I2C1_Wr(w_data); // send data (data to be written)
  I2C1_Stop(); // issue I2C stop signal
}
 
 
unsigned char BCD2UpperCh(unsigned char bcd)
{
  return ((bcd >> 4) + '0');
}
 
 
unsigned char BCD2LowerCh(unsigned char bcd)
{
  return ((bcd & 0x0F) + '0');
}
 
 
int Binary2BCD(int a)
{
   int t1, t2;
   t1 = a%10;
   t1 = t1 & 0x0F;
   a = a/10;
   t2 = a%10;
   t2 = 0x0F & t2;
   t2 = t2 << 4;
   t2 = 0xF0 & t2;
   t1 = t1 | t2;
   return t1;
}
 
 
int BCD2Binary(int a)
{
   int r,t;
   t = a & 0x0F;
   r = t;
   a = 0xF0 & a;
   t = a >> 4;
   t = 0x0F & t;
   r = t*10 + r;
   return r;
}
 
 
 
int second;
int minute;
int hour;
int hr;
int day;
int dday;
int month;
int year;
int ap;
 
unsigned short set_count = 0;
short set;
 
char time[] = "00:00:00 PM";
char date[] = "00-00-00";
 
void main()
{
   I2C1_Init(100000); //DS1307 I2C is running at 100KHz
 
   CMCON = 0x07;   // To turn off comparators
   ADCON1 = 0x06;  // To turn off analog to digital converters
 
   TRISA = 0x07;
   PORTA = 0x00;
 
   Lcd_Init();                        // Initialize LCD
   Lcd_Cmd(_LCD_CLEAR);               // Clear display
   Lcd_Cmd(_LCD_CURSOR_OFF);          // Cursor off
   Lcd_out(1,1,"Time:");
   Lcd_out(2,1,"Date:");
   
   do
   {
     set = 0;
     if(PORTA.F0 == 0)
     {
         Delay_ms(100);
         if(PORTA.F0 == 0)
         {
             set_count++;
             if(set_count >= 7)
             {
                set_count = 0;
             }
         }
     }
     if(set_count)
     {
        if(PORTA.F1 == 0)
        {
          Delay_ms(100);
          if(PORTA.F1 == 0)
              set = 1;
        }
        
        if(PORTA.F2 == 0)
        {
          Delay_ms(100);
          if(PORTA.F2 == 0)
              set = -1;
        }
        if(set_count && set)
        {
          switch(set_count)
          {
            case 1:
                    hour = BCD2Binary(hour);
                    hour = hour + set;
                    hour = Binary2BCD(hour);
                    if((hour & 0x1F) >= 0x13)
                    {
                      hour = hour & 0b11100001;
                      hour = hour ^ 0x20;
                    }
                    else if((hour & 0x1F) <= 0x00)
                    {
                      hour = hour | 0b00010010;
                      hour = hour ^ 0x20;
                    }
                    write_ds1307(2, hour); //write hour
                    break;
            case 2:
                     minute = BCD2Binary(minute);
                     minute = minute + set;
                     if(minute >= 60)
                        minute = 0;
                     if(minute < 0)
                        minute = 59;
                     minute = Binary2BCD(minute);
                     write_ds1307(1, minute); //write min
                     break;
            case 3:
                    if(abs(set))
                      write_ds1307(0,0x00); //Reset second to 0 sec. and start Oscillator
                    break;
            case 4:
                     day = BCD2Binary(day);
                     day = day + set;
                     day = Binary2BCD(day);
                     if(day >= 0x32)
                        day = 1;
                     if(day <= 0)
                        day = 0x31;
                     write_ds1307(4, day); // write date 17
                     break;
            case 5:
                    month = BCD2Binary(month);
                    month = month + set;
                    month = Binary2BCD(month);
                    if(month > 0x12)
                      month = 1;
                    if(month <= 0)
                      month = 0x12;
                    write_ds1307(5,month); // write month 6 June
                    break;
            case 6:
                    year = BCD2Binary(year);
                    year = year + set;
                    year = Binary2BCD(year);
                    if(year <= -1)
                       year = 0x99;
                    if(year >= 0x50)
                       year = 0;
                    write_ds1307(6, year); // write year
                    break;
          }
        }
     }
 
      second = read_ds1307(0);
      minute = read_ds1307(1);
      hour = read_ds1307(2);
       hr = hour & 0b00011111;
       ap = hour & 0b00100000;
      dday = read_ds1307(3);
      day = read_ds1307(4);
      month = read_ds1307(5);
      year = read_ds1307(6);
 
 
      time[0] = BCD2UpperCh(hr);
      time[1] = BCD2LowerCh(hr);
      time[3] = BCD2UpperCh(minute);
      time[4] = BCD2LowerCh(minute);
      time[6] = BCD2UpperCh(second);
      time[7] = BCD2LowerCh(second);
 
      date[0] = BCD2UpperCh(day);
      date[1] = BCD2LowerCh(day);
      date[3] = BCD2UpperCh(month);
      date[4] = BCD2LowerCh(month);
      date[6] = BCD2UpperCh(year);
      date[7] = BCD2LowerCh(year);
      
      if(ap)
      {
         time[9] = 'P';
         time[10] = 'M';
      }
      else
      {
         time[9] = 'A';
         time[10] = 'M';
      }
 
      
      Lcd_out(1, 6, time);
      Lcd_out(2, 6, date);
      Delay_ms(50);
 
   
   }while(1);
}
 

Code: 
time[0] = BCD2UpperCh(hr);
time[1] = BCD2LowerCh(hr);
time[3] = BCD2UpperCh(minute);
time[4] = BCD2LowerCh(minute);
time[6] = BCD2UpperCh(second);
time[7] = BCD2LowerCh(second);

In this point the time values are converted to ASCII characters and stored in the array, for example if time is 10:24:35 the values will be

Code: 
time[0] ='1'
time[1] ='0'
time[3] ='2'
time[4] ='4'
time[6] ='3'
time[7] ='5'

Since you don't want ASCII values '0'..'9' (decimal 48-57) you can either subtract 48 from the array characters to convert them to 0-9 or modify the BCD2UpperCh and BCD2LowerCh and remove the +'0' part
 
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