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USB Adapter

Discussion in 'SimTools compatible interfaces' started by kopex, Oct 16, 2010.

  1. kopex

    kopex New Member

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    Today i finished my AMC Board and tried to connect it to the PC with an USB Adapter.
    When ein connect it, i get a short circuit an my Power Supply shuts off.

    I cannot find the problem on the board.... whats wrong?
    kopex, Oct 16, 2010
    #1
  2. egoexpress

    egoexpress Active Member

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    Hold the pcb in between a strong lightsource and your eyes, so that the light shines through the pcb, and then check your solderjob for shortcuts.

    If you have a high res camera, post a picture of your pcb, while the light shines through it.

    regards
    egoexpress, Oct 16, 2010
    #2
  3. Frakk

    Frakk Active Member

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    Which power supply is shutting off?

    USB power supply (PC) or the 12V power supply?
    Frakk, Oct 16, 2010
    #3
  4. kopex

    kopex New Member

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    i checked everything 5 times.... there is no shortcut...

    The PCB Powersupply shuts of. Now i changed the Source and it is working. But is only works, if i plug in the power AFTER plug in the USB Adapter. In the other case, the LM2940 does not start?

    Anyway.... When i use ponyprog2000 and i try to read security settings, then the red LED flashes, but i get the Error that device is missing.

    After 1000000 errors it works. After that i tried ti write, but the same here. Again after 10000 errors i could write the settings. But the writing procedure took about 10 Sekonds. I dont know if this is normal.

    Now i am flashing the firmware and the red led lights on, but i cant see any progress?
    I am waiting for 10 minutes now, but nothing changes in the status. (when i was reading settings, the status also was not changing. It was 0% and then just finished (after 10 seconds) )

    is that normal?
    kopex, Oct 17, 2010
    #4
  5. egoexpress

    egoexpress Active Member

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    No ;P

    Make sure that you enable the serial printer option for the USB adapter.
    What crystal do you use? Some Atmega', like the one I used for example, dont work with 24kHz overclocking. Try a 18 or 22kHz crystal instead to see if it resolves the device missing problem.
    It did the trick for my AMC.

    Btw, I did use sockets for all active parts (crystals, ICs, voltage reg.), so that I am able to replace them easily for troubleshooting.

    regards
    egoexpress, Oct 17, 2010
    #5
  6. kopex

    kopex New Member

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    after a lot of errors and retries it works with 22MHz.

    Reading and Writing security settings works fine. Flashing the firmware takes about 1 hour (not finished yet). It seems to be VERY SLOW.
    kopex, Oct 17, 2010
    #6