[ts-7000] Re: Strange results with the keypad program

["Blair" <>]

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" <> 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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