12f509 and DS18B20

[robertg]

Hi Richard,

The code shown is for the 18F and yep the 12F doesn't support serout2.
But the point I was making below, believe the issue I'm having is PORTA on the 18F is probably the same as the GPIO.X on the 12F
Bottom line is I can't get the code you supplied on the 12F and trying to establish a baseline using the 18F

Rob.

[richard]

what i supplied does not actually do much other than prove that pbp can compile 12f509 code for a onewire device when a word var is declared as per

My first issue, is the 12F509 won't accept the word as variable

Bottom line is I can't get the code you supplied on the 12F and trying to establish a baseline using the 18F

i cannot quite understand that statement. there is no point posting code for a 18f when you are trying to employ a 12f509
post the actual code you are using [preferably in code tags]

[robertg]

Yep correct.

And sorry for wasting your time, I've got everthing I need working on a 18F45K20 now.
Putting aside the extra legs to solder, for the extra $3 for this micro. makes sense to work with the 18f as I now have heaps of program space and no restriction on I/O pins etc.... plus it works!

ciao and thanks anyway!

Rob.

[tumbleweed]

...testing the code on a PIC18F45K20 and sensor works fine on PORTC or PORTD but can't seem to get any readings when configured using ports eithe port A, B or E

That's probably because many pins on ports A, B, and E are also analog pins so the digital input buffer is disabled by default.
See the ANSEL/ANSELH registers

[robertg]

Thanks Tubleweed!

After your comment on the ANSEL/h after searching the datasheet on those registered, yep found that information buried in the doc.
Haven't touched a PIC micro in years, I'm going through the relearning experience. You do forget how powerful and complex these devices are.


Rob.