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Urgent - Prop reseting with TV? — Parallax Forums

Urgent - Prop reseting with TV?

Martin HebelMartin Hebel Posts: 1,239
edited 2007-10-23 17:39 in Propeller 1
Trying to get a demo for a road show going here, and I have a Demo board, RC photo resistor network and small LCD TV setup.· Reading light level, displaying graphically.

All works fine until I disconnect the USB.· Then, when I power up, the prop keeps resetting after starting display.· I've swapped power supplies out and boards, no change.· It doesn't happen when USB is plugged in.

Thoughts?

-Martin


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StampPlot - GUI and Plotting Software
Southern Illinois University Carbondale, Electronic Systems Technologies

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2007-10-23 17:37
    There was a problem with a sneak power path through the FTDI USB chip with the transmit line from the Prop supplying enough power to trigger the reset line when there was no USB connected (and supplying power). Could you be setting pins 30 or 31 to outputs?
  • Martin HebelMartin Hebel Posts: 1,239
    edited 2007-10-23 17:39
    Hmmm, yes, I'm running BS2_Functions. Changed the Debug pins- works!! Thanks as always Mike.
    It was odd that I could boot up, disconnect the cable, and it ran fine, but it I reset, it lost it.

    -Martin

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    StampPlot - GUI and Plotting Software
    Southern Illinois University Carbondale, Electronic Systems Technologies
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