Hello all,

I've written some routines to talk to a DS1820 thermometer. The program
works 95% of the time, the other 5% it returns 0xFF for all the
scratchpad locations. ie the 1820 is not responding, although the
presence pulse after the master bus reset is OK.

As far as I can tell the routines are correct I've checked the timing
etc.

I've also tried not using the ICD, and disabling interrupts, while
reading/writing.

Can anyone tell me whether its a problem using portA. I'm using a 4K7
pull up resistor and the port is configured for digital
(ADCON1=0000.0110).

Best Wishes

Steve Allard

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