--- "naturalwatt" <> wrote:
> You're right, I'll use a PIC with something like a 4
> -word program to receive a byte on RS232 and then
> step it out on 2 DIO pins. It always gets me that
> PIC uses 1 for input and 0 for output while the Cirrus
> chip uses the opposite convention.
> I wanted to avoid having to add anything at the TS7250 end.
It's a shame you've got a constrain against adding hardware -- or
maybe not a restraint but a "I don't like that solution." }:-} It's
always annoying having to add hardware since nobody likes screwing
with the board or adding cost and labor.
One other possibility is to create a wire-wrapped breadboard on the
TS-7250 side of things for testing, adding a 2N2222 transister on the
outputs you need to drive the display.
That would increase the DIO pins' current driving capability and
allow you to increase the voltage on the wires to reduce the
sinusoidal flatening of the digital signals to the display unit.
The display unit could probably accept a higher voltage any way and
you might not need a resister to reduce whatever working voltage you
use on the inputs of the display.
Sounds like your display unit is clocking in garbage on long wire
runs because the signal's going flat. An O'Scope might show you how
you could add a pull-up resister on the display side of signals to
elevate the voltages and maybe get the data clocking in properly.
Maybe.
LOL! There are lots of solutions for doing it sloppy. }:-}
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