prop to prop communication

lyons5959

i'm working on a data display. so far i have one prop set up to output a display to a tv and another interfaced with ADC's and thermocouples. I'm trying to use FullDuplex to interface the two. Do I need pull up resistor on the lines. so far this hasn't work. it works when the data prop is transmitting to the prop plug and the display prop is recieving from the prop plug but it won't work when the two are together. any ideas?

lyons5959

heres some code

the data end

Con
  _clkmode      = xtal1 + pll16x                        ' use crystal x 16
  _xinfreq      = 5_000_000

  _data = $7000

  tcpin = 4

OBJ

  THERMO : "thermocouple"
  ADC : "adc_in"
  RPM : "rpm"
  uart : "fullduplex"

PUB Main | k, cog, ok
  uart.start(3,2,9600)

  THERMO.start(tcpin,_data + 20)    'collect thermocouple data)
  ADC.start(_data + 4)
  RPM.start(_data)

  repeat
    ok := uart.rx
    if ok == "s"
      uart.tx("s")
      repeat k from 0 to 21
        uart.tx(byte[noparse][[/noparse]_data + k])

and on the display end

Var
  long stack[noparse][[/noparse]30]

Obj

  uart : "FullDuplex"

Pub start(passval) : cog

  cog := cognew(main(passval), @stack) + 1

Pub main(_data) | k, ok

  uart.start(5,2,9600)

  waitcnt(cnt + 160_000_000)

  repeat
    uart.tx("s")
    ok := uart.rx
    if ok == "s"
      repeat k from 0 to 21
        byte[noparse][[/noparse]_data + k] := uart.rx

T Chap

You don't have the mode parameter in the Full Dup start. This may or may not solve it, but try (rxpin, txpin, 0, baud). This assumes you are using the Full Duplex Serial Object

lyons5959

the FullDuplex i'm using might be old because it doesn't have a mode parameter. anyways i know that each one works by itself with this exact code, they just don't work with each other. do i need pull-up resistors?

T Chap

Did you already try a 10k pullup on both lines? Sounds like something other than pullups.

Post Edited (originator) : 3/14/2007 4:04:13 AM GMT

simonl

OK, I'll ask the dumb question (!): have you crossed the Tx/Rx lines?

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Cheers,

Simon

BTW: I type as I'm thinking, so please don't take any offense at my writing style

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