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Arduino Forum Due Serial Port Rx0 Tx0. Rx0 appears to fail
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  • rx0
  • due
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Related

Due Serial Port Rx0 Tx0. Rx0 appears to fail

Former Member
Former Member over 11 years ago

Hi I can show the Tx0 port working fine with Atmel Studio,Jtag and the Uart Example program. The receiver Rx0 remains high/virtually nchanging  when connected to an RS232 to 3.3V translator.

I have tried two boards with same result. Any guidance/experience with uart on Txo Rxo greatly appreciated.

Regards

        S Lawton

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  • Robert Peter Oakes
    0 Robert Peter Oakes over 11 years ago

    can you provide picture of your connectivity and also your code ?

     

    Thanks

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  • Former Member
    0 Former Member over 11 years ago in reply to Robert Peter Oakes

    1) The signal is generated via a PC via  Fedora19> Eclipse> Python> motion-driver- client> Keyboard strokes sent to the Serial port . The PC serial output is connected to an RS232 to 3.3v level translator. When the output from this device is open circuit the 3.3V side switches cleanly as char are sent.

    When connected to Rx0 on Due the signal hardly changes  (implying a short ?).

    2) The code is simply the build of the Atmel Uart Example program . I can prove the transmit side works fine but cannot see a fault (Yet!) in the Rx0 side eg PIO disconnect. Does this clarify?

    Thanks

               S Lawton

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  • Robert Peter Oakes
    0 Robert Peter Oakes over 11 years ago in reply to Former Member

    I dont know you skill level or experiance so forgive this rather 101 statement

     

    Have you connected the RX of the adapter (Level Shifter) to the RX of the board, if so this is wrong, it should be RX to TX, TX to RX (Cross over so to speak)

     

    Are you accidentally using the pins on the controller for IO and setting them both to output ?

     

    Peter

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  • Robert Peter Oakes
    0 Robert Peter Oakes over 11 years ago in reply to Former Member

    I dont know you skill level or experiance so forgive this rather 101 statement

     

    Have you connected the RX of the adapter (Level Shifter) to the RX of the board, if so this is wrong, it should be RX to TX, TX to RX (Cross over so to speak)

     

    Are you accidentally using the pins on the controller for IO and setting them both to output ?

     

    Peter

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  • Former Member
    0 Former Member over 11 years ago in reply to Robert Peter Oakes

    Peter

    I will try a new path to cross check the electrical connection ( but the TX0 out does produce a signal generated from the Due code and it does appear on the output of the level shifter ). I will also review the example  board_init() keeping Tx, Rx directionality in view. Happy to receive your 101 as I cannot id bug thus far!

    Stewart  Lawton

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