PIC18EXT.BAS Alteration

[Rob]

Hi,

I need access to the UCON register (USB Control Register) so that I can disable the USB port in an 18F4550.

I have added the line:

UCON    var byte EXT

into the PIC18EXT.BAS file and this seems to have done the trick.

Is this the correct way to have done this or should I not have touched this file at all?

Thanks very much

Rob

[Bruce]

Hi Rob,

You can add whatever external register definitions you like to this file. That's
how I add any that aren't already in there.

[Darrel Taylor]

Just remember that the next PBP upgrade will overwrite that file.

Keep track of what you've changed.
<br>

[Rob]

Cheers for your replies - much appreciated (as always!).

Kind Regards

Rob

[rdheiliger]

I added the definition of UCON to the PIC18EXT.BAS file. Which eliminates the compile error. But the PortC.4 and 5 when read with either a high or low applied read zero. What else do i need to do to use these ports as input.

RD

[Darrel Taylor]

Adding UCON implies that you are using USB.

PORTC.4, PORTC.5 are the USB D+/D- pins, so you won't be able to use them as digital I/O at the same time as USB.
<br>