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Last Post 13 May 2016 04:09 PM by  Michael Weigand
DM3730 UART B Inverted
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Michael Weigand
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12 May 2016 02:27 PM

    I am trying to communicate with the DM3730 on the development board using the UARTB Serial Port.  Data is going across the line to the computer, but isn't decoded correctly because the signal is inverted.  I am using minicom on both ends to test the connection and a logic analyzer to view the data going across the line.  Is there any way to invert the UART signals on the board, or do I need to get an inverter?
    Adam Ford
    Advanced Member
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    13 May 2016 10:22 AM
    The signals go from the processor to an RS-232 tranceiver, so the signals should be operating at the RS-232 voltage levels which also inverts the signals. You should be able to connect one of the supplied DB9 adapters to UARTB (J25 on the baseboard) and connect it to a PC.

    I am not sure what operating system you're using, but we have an example of how to do that with Linux in our software test plan: http://support.logicpd.co...talid=0&EntryId=1400

    If you want the levels generated from the processor (which are lower voltage and inverted from the tranceiver does), look at J33 pins 13,15,17 and 19

    Does that answer your question?

    adam
    Michael Weigand
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    13 May 2016 04:09 PM

    Adam,

    Thanks for the response.  I wanted the levels coming directly from the processor.  Using the pins on J33 I am able to communicate with the other device I am interfacing with the Torpedo.

    Mike
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