thanks .. I modified the source and incorporated these changes and the problem
went away.
Dom
--- In "Blair" <> wrote:
>
> I had the same problem on a 7260. Something about parasitic capacitance.
>
> for(pos = 0; pos < 4; pos++) {
> *pbddr = 0; // all pins set as inputs
> *pbddr = (1 << pos); // exactly one pin is set as output
> *pbdr = 0xffffffff;
> *pbdr = ~(1 << pos); // only one pin is set to 0
> on |= (~(*pbdr >> 4) & 0xf) << (4 * pos);
> }
>
> // Original code doesn't work. Parasitic capacitance
> /* for(pos = 0; pos < 4; pos++) {
> *pbddr = (1 << pos);
> *pbdr = ~(1 << pos);
> on |= (~(*pbdr >> 4) & 0xf) << (4 * pos);
> }
> */
>
>
>
>
> --- In "Dom Storey" <dstorey@> wrote:
> >
> > Hi
> >
> > I am using the keypad on a ts-7250.
> > all characters on the keypad on rows 1,2 and 4 produce the right
> > characters, but row 3 (characters 7,8,9,<2nd>) produce double characters
> > every time. specifically
> >
> > key chars
> > 7 7*
> > 8 80
> > 9 9#
> > <2nd> CD
> >
> > note that row 4 keys are <clear>,0,<help>,<enter> and they produce
> >
> > <clear> *
> > 0 *
> > <help> #
> > <enter> D
> >
> > which is a bit suspicious to me...
> >
> > However, a faulty lead would just produce 1 character, not 2 consecutive
> > ones.
> >
> > has anyone else seen such behaviour?
> >
>
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