[PIC] Onewire RTC reading from DallasButton DS1994 for Pic18f452

[rajib.das]

I would like to get help on the C code for reading RTC from Dallas Button DS1994 for Pic18f452.

I tried with the following code but not working..

void Read_Clock_Time_iButton(void) {



     Ow_Reset(&PORTB, 0);                         // Onewire reset signal
     Ow_Write(&PORTB, 0, 0xCC);                   // Issue command SKIP_ROM
     Delay_us(120);
     Ow_Write(&PORTB, 0, 0xF0);     //read memory command
     Ow_Write(&PORTB, 0, 0x02);  // send LSB of target addr then MSB
     Ow_Write(&PORTB, 0, 0x02);
     //Ow_Write(&PORTB, 0, 0x0202 & 0xFF);  // send LSB of target addr then MSB
     //Ow_Write(&PORTB, 0, (0x0202 & 0xFF00)/ 0x100);
     Ow_Write(&PORTB, 0, 0x33);
     Delay_us(120);                   // Issue command Read_ROM
     *iButton_fraction_seconds = Ow_Read(&PORTB, 0);

     //Ow_Write(&PORTB, 0, 0xFF);                   // Issue command Read_ROM
     for(k = 0; k <= 3; k++) {
        iButton_clock_data[k] = Ow_Read(&PORTB, 0);
     }
     *iButton_fraction_seconds = (*iButton_fraction_seconds)/256.0;          // convert value to fractional decimal secs
     //iButton_clock_data = iButton_clock_data[0]|(iButton_clock_data[1]*0x100)|(iButton_clock_data[2]*0x10000)|(iButton_clock_data[3]*0x1000000);
     iButton_seconds_total = iButton_clock_data[0] + (iButton_clock_data[1]*0x100) + (iButton_clock_data[2]*0x10000) + (iButton_clock_data[3]*0x1000000);

Any kind of help will be much appreciated