Perhaps your minimum sampling time is too low, and this shows up only on th=
at analog input conversion.

Try to increase sampling time, and see if it fixes it.

Cheers,
Mario


At 19.14 2012.02.20, you wrote:
>Hello.
>
>I have used a PIC18F2458 to make a joystick controller that features 6
>12-bit analog axins and 36 buttons.
>
>Everything is cool but there is something strange with the 6th analog axis
>(which is AN8 because AN6 and AN7 are not implemented).
>Basically I never read an analog value less than ~85, which corrspond to
>around 100mV.
>
>The analog input usually is connected to a potentiometer but I also tried
>to connect it to a ground trace, as near as possible to the USB connector.
>but I got the same result.
>
>I was wondering what you guys think. Could it be a configuration error? Th=
e
>other 5 channels work fine.
>
>I can post the source code if necessary.
>
>Thank you
>Cristiano
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