Pic Rtc Code

/*
 * Project name:
    PIC Development Board
 * Copyright
     (c) Researchdesignlab.com
 * Test configuration:
     MCU:             PIC16F877A
     Dev.Board:       PIC
     Oscillator:      20.0 MHz
     Software:  mikroC PRO for PIC v 4.6

*/


sbit LCD_RS at RB4_bit;
sbit LCD_EN at RB5_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;

sbit I2C_Scl at RC3_bit;
sbit I2C_Sda at RC4_bit;


sbit I2C_Scl_Direction at TRISC3_bit;
sbit I2C_Sda_Direction at TRISC4_bit;

sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;



void delay()
{
        unsigned char z;
        for(z=250;z>0;z--)
        ;
}





void rtc_init()
{
        unsigned char a[]={0x00,0x00,0x01,0x06,0x02,0x06,0x03,0x05,0x04,0x17,0x05,0x09,0x06,0x11};
        unsigned char x=0;

        I2C1_Start();
        I2C1_Wr(0xD0);
        I2C1_Wr(a[0]);
        I2C1_Wr(a[1]);
        I2C1_Stop();
        I2C1_Start();
        I2C1_Wr(0xD0);
        I2C1_Wr(a[2]);
        I2C1_Wr(a[3]);
        I2C1_Stop();
        I2C1_Start();
        I2C1_Wr(0xD0);
        I2C1_Wr(a[4]);
        I2C1_Wr(a[5]);
        I2C1_Stop();
        I2C1_Start();
        I2C1_Wr(0xD0);
        I2C1_Wr(a[8]);
        I2C1_Wr(a[9]);
        I2C1_Stop();
        I2C1_Start();
        I2C1_Wr(0xD0);
        I2C1_Wr(a[10]);
        I2C1_Wr(a[11]);
        I2C1_Stop();
        I2C1_Start();
        I2C1_Wr(0xD0);
        I2C1_Wr(a[12]);
        I2C1_Wr(a[13]);
        I2C1_Stop();


}

void display(unsigned char a1)
{
        unsigned char b1;
        b1=(a1 & 0x0f0);
        b1=(b1>>4)+0x30;
        Lcd_Chr_Cp(b1);
        b1=(a1 & 0x0f);
        b1=b1+0x30;
        Lcd_Chr_Cp(b1);

}










void main()
{

        unsigned char i,temp,ch,hr,min,STORE_VAL=0,FLAG1=0,FLAG2=0;
        unsigned int LDR_VAL1,LDR_VAL2,LDR_VAL3;


            Lcd_Init();                        // Initialize LCD

      Lcd_Cmd(_LCD_CLEAR);               // Clear display
      Lcd_Cmd(_LCD_CURSOR_OFF);
               delay();

      delay();
        I2C1_Init(100000);
            delay();
         rtc_init();

        while(1)
        {



                   Lcd_Out(1, 1, "TIME ");
                        I2C1_Start();

                        I2C1_Wr(0xD0);
                        delay();
                        I2C1_Wr(2);

                       Delay_100ms();

                        I2C1_Start();

                        I2C1_Repeated_Start();
                        I2C1_Wr(0xD1);

                        ch=I2C1_Rd(0u);

                         I2C1_Stop();

                        hr=ch;
                        display(ch);
                         delay();
                         delay();
                         delay();

                        Lcd_Chr_Cp(':');

                       I2C1_Start();

                        I2C1_Wr(0xD0);

                        I2C1_Wr(1);

                         Delay_100ms();

                        I2C1_Start();

                      I2C1_Repeated_Start();
                        I2C1_Wr(0xD1);

                        ch=I2C1_Rd(0u);
                        min=ch;
                        delay();
                         I2C1_Stop();
                        delay();
                        display(ch);
                        delay();
                        delay();
                delay();

                        Lcd_Chr_Cp(':');

                        I2C1_Start();

                        I2C1_Wr(0xD0);

                        I2C1_Wr(0);

                        Delay_100ms();

                        I2C1_Start();

                       I2C1_Repeated_Start();
                        I2C1_Wr(0xD1);

                        ch=I2C1_Rd(0u);

                         I2C1_Stop();
                        display(ch);
                        delay();
                        delay();

                        if(hr==0x12||hr==0x01||hr==0x02||hr==0x03||hr==0x04||hr==0x05||hr==0x06)
                        {
                         Lcd_Chr_Cp(' ');
                         Lcd_Chr_Cp('A');
                         Lcd_Chr_Cp('M');
                        }
                        else
                        {
                         Lcd_Chr_Cp(' ');
                         Lcd_Chr_Cp('P');
                         Lcd_Chr_Cp('M');
                        }



                        i=0;
                        Lcd_Out(2, 1, "DATE ");
                       I2C1_Start();

                        I2C1_Wr(0xD0);

                        I2C1_Wr(4);

                        Delay_100ms();
                        I2C1_Start();

                       I2C1_Repeated_Start();
                        I2C1_Wr(0xD1);

                        ch=I2C1_Rd(0u);
                        delay();
                        I2C1_Stop();
                        display(ch);
                        delay();
                        delay();

                        Lcd_Chr_Cp('-');

                       I2C1_Start();

                        I2C1_Wr(0xD0);

                        I2C1_Wr(5);
                         Delay_100ms();

                        I2C1_Start();

                       I2C1_Repeated_Start();
                        I2C1_Wr(0xD1);

                        ch=I2C1_Rd(0u);
                        delay();
                         I2C1_Stop();
                        display(ch);
                        delay();
                        delay();

                       Lcd_Chr_Cp('-');

                        I2C1_Start();

                        I2C1_Wr(0xD0);

                        I2C1_Wr(6);
                         Delay_100ms();

                        I2C1_Start();

                        I2C1_Repeated_Start();
                        I2C1_Wr(0xD1);

                        ch=I2C1_Rd(0u);

                        I2C1_Stop();
                        display(ch);
                        delay();
                        delay();
                    





      }
     }