12F508 and Dallas 1820 not working

[Acetronics2]

Hi,

The first thing is to be sure of your sensor ID ...

The second ... to be sure the bytes are transmitted in the right sequence ( not swapped )

from this point of view ... why not try to write and read to it skipping this ID. That could point closer to the reason your code doesn't work ...


Alain

[Picprogman]

Thank you again.

The sensor ID is correct. I have tested the same sensor and the same piece of code with 16F876A using PortC.0, and I can read the sensor without any trouble. Hardware is ok, checked it carefully. Again my opinion is, that something is wrong with my code with GPIO.1. I am not an engineer, and I am not sure how these pins work in 12F508. When using 16F876A or 16F873 no special configuration is needeed. Just define:

DQ var PortC.0

and everything works.

[fratello]

Instead :
TRISIO =%00000010 '???? maybe wrong?
try :
TRISGPIO + %00000010
since I think don't exist TRISIO (see page 32 of datasheet : just TRISGPIO, TRISC, GPIO ....where GPIO is refferenced as PortB)