rajib.das
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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
View attachment DS1994.pdf
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
Code:
//-----------------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
}
//------------------------------------------------------------------------------
Code:
//---------------------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);
//------------------------------------------------------------------------------
}