[PIC] How to write Text (Hello World) on iButton DS1994, P18F452

[rajib.das]

Hi there
I am trying to use DS1994 interfacing with P18f452.
My intension is to store data on iButton memory and also need to read the clock on it to set RTC PCF8593 .
So far I am able to read the serial key and print them on LCD.

Please any Kind of help would be much appreciated..

For convenience I have attached data sheet, schematics and my C protocols for one wire.

View attachment DS1994.pdf

//-----------------Initiate_iButton at RB0--------------------------------------
void Initiate_iButton (void){
     iButton_READ_Direction = 1;   // designate PORTE2 pin as input
    INTCON2.RBPU = 0; // to pullup internal resister at portB
}
//------------------------------------------------------------------------------

//---------------------Start iButton Coms Here----------------------------------
void Test_iButton (void){
    
    char sernum;
    char sernum_hex[8];
    int l;
    int colona;

    //Unique Part Serial Number
    Ow_Reset(&PORTB, 0);                         // Onewire reset signal
    Ow_Write(&PORTB, 0, 0x33);                   // Issue command Read_ROM
    Delay_us(120);

    Lcd_Cmd(_LCD_CLEAR);             // Clear display
    Lcd_Cmd(_LCD_CURSOR_OFF);        // Cursor off
    Lcd_Out(1,1,"1:iButton Key:"); // Prepare and output static text on LCD
    delay_ms(500);
    colona = 17;
    for(l = 0; l <= 7; l++)
       {
          colona = colona - 2;
          sernum = Ow_Read(&PORTB, 0);
          bytetohex(sernum, sernum_hex);
          Lcd_Out(2, colona, sernum_hex);
        }
        delay_ms(1000);
//------------------------------------------------------------------------------
}

View attachment DS1994.pdf