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LP-MSPM0C1104: can't use PA28 as RX of uart0

bill.liao
Intellectual 275 points
Part Number: LP-MSPM0C1104

Tool/software:

Hi, experts:

     I used CCS Theia 1.3.1 to set uart configure of 20 WQFN in LP-MSPM0C1104, if I set RX PA22/TX PA23, connect PA22 to a logic analyzer, then send test data like "0x00 0x55 0xB1" to PA22, works well, but if I changed RX to PA28, sent the same test data to it, the data captured in logic analyzer is other value with frame error, so I wonder what's the cause? Thanks.test_uart.rar

Bill

  • 0
    TI__Genius 11695 points

    Hi Bill,

    If use logic analyzer, then the data observed by it should have no relationship with the MCU behavior. Of course, the pin function of RX should be properly configured.

    Can you share some data waveform of logic analyzer? Any external circuit applied with PA28?

    B.R.

    Sal

  • +1 in reply to Sal Ye
    Intellectual 275 points

    Hi, Sal:

         Good to see you again. PA28 is connected to RX of a LIN transceiver, I captured a waveform sent from RX of LIN transceiver, and a waveform received from PA28.

    Bill