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Was working, now it's not — Parallax Forums

Was working, now it's not

RogerInHawaiiRogerInHawaii Posts: 87
edited 2009-03-06 05:33 in Propeller 1
I've been successfully using the Propeller chip on the Propeller Education Kit breadboard for a couple of weeks. Today it's not working. When I attempt to do the "Identify Hardware" function·(or run one of the programs that have been working all along), it seems to communicate with the board but then reports that "No Propeller chip found on serial port". The blue LED on the Propeller Plug flashes quickly, so some communicationis happenning, but the red LED does not (as it used to). I've tried all the diagnostics in the manual to no avail.

Any suggestions?
·

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2009-03-06 05:27
    Make sure you have adequate power for the Propeller. It has to be working to be identified. The crystal doesn't have to work since the Propeller bootloader uses the internal fast clock. The EEPROM doesn't have to work unless you're downloading to the EEPROM and, even then, the program is first downloaded to the RAM, then copied to EEPROM.

    Make sure the connections on the PEK are still ok. There might be a bad connection between the PropPlug and the Propeller.

    The blue LED on the PropPlug shows that the PropPlug is being recognized by the PC.

    Bad power and bad serial connections are the two problems that account for almost all "No Propeller chip found" situations.
  • RogerInHawaiiRogerInHawaii Posts: 87
    edited 2009-03-06 05:33
    Mike,

    As usual, you hit the nail right on the head. My battery had low power. Switching to a new battery solved the problem.

    Thanks,

    - Roger
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