On Wed, Sep 23, 2009 at 6:16 PM, Spehro Pefhany <speff@interlog.com> wrote:

> At this point you should not be trusting anything- verify that the pins
> are actually outputs by verifying that they will actually sink or source
> current (eg. to an LED in series with a resistor to Vdd or Vss).
> You could also try feeding a ~10Hz 0V/5V square wave signal into each
> "output"
> via a 1K series resistor and see if any misbehavior is noted.
>

That's a good point actually. I am not sure which language the firmware was
developped but *if* there is any firmware error on banking or context
savings in the isr or even with the indirect addressing then the TRIS could
set incorrectly at some point so that the PORTB becomes floating input from
active output.

Tamas



>
> >Best regards,
>
> Spehro Pefhany --"it's the network..."            "The Journey is the
> reward"
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>
>
>
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