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TMS320F28335: SCI communication signal active level is low. (Inverted polarity)

sheldon liu
Intellectual 260 points
Part Number: TMS320F28335

Tool/software:

Dear Expert,

When I use TMS320F28335 's SCI C module,  (SCITXDC,  SCIRXDC),   the active level is low, and the inactive level is high.  It is strange.   ( I communicate TX to RX,  DSP can send and receive data successfully.)

As I know,  SCI default RX /TX  level is high,  active level is high. And inactive level is low.  (high->1, low -> 0)

Do I miss some configuration that cause the inverted polarity? How to configure it as normal polarity mode.(high->1, low -> 0)?

 

Thanks and Best regards

Sheldon 

  • +1
    TI__Mastermind 21200 points

    Hello Sheldon,

    There is no polarity bit in the SCI registers. Can you show what waveform you see and how it differs from the expected data format?

    Are you running your own program on the device? Could you please try loading and running one of our software examples and see if you see the same behavior?

    Best Regards,

    Allison