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On-board USB, self powered or BUS powered? — Parallax Forums

On-board USB, self powered or BUS powered?

eagletalontimeagletalontim Posts: 1,399
edited 2013-10-01 19:13 in Propeller 1
Got a question again :) I am designing a board that will have an on-board USB data / programming port but have run into an issue. When using the Prop Plug on my prototype, if the circuit is already turned on and i plug in the USB cable to my computer, it will reset the Prop then allow communication. I am wanting to NOT reset the prop when plugging in the USB cable to my computer. Can this be changed by running the FT232R chip from the on-board power supply instead of powered through the computer BUS?

Comments

  • jmgjmg Posts: 15,173
    edited 2013-10-01 19:08
    A jumper on the reset line ?

    USB + OS often do a little dance, as they enumerate the new device, and some drivers can disable part of that.

    However, you are into many-variables territory, and a jumper is much simpler to see :)
  • eagletalontimeagletalontim Posts: 1,399
    edited 2013-10-01 19:13
    So just put a jumper on the reset of the Prop? That would disable reprogramming of the prop unless the jumper is there, but still allow data to be sent and received from the Prop to the computer, correct?


    EDIT *** : Also, is there a way to "lock" the FT232R from being reprogrammed after I do the initial setup? And.... will I be able to access the FT232 at first without it being powered by the bus? I need to set the power param to self once I get it all built. I think it comes default set to BUS powered.
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