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LAUNCHXL-F28069M: SCI Loopback Debugging

James McKenna
Prodigy 136 points
Part Number: LAUNCHXL-F28069M


I am confused setting up my Eval board for SCI. I have the device powered from the JTAG with JP1 and JP2 connected, and a separate UART TeraTerm connection on the SCIA pins to my PC. When a character is sent to the device there is no loopback. This is the desired effect.

I remove jumpers J1 and J2 and power the board externally from Boost driver board. When I send a character to the device through SCIA it is looped back.

Could this have to do with the way the board is being programmed over the JTAG interface? I was testing with loopback before so maybe some part of that code are not being erased from the device?

  • 0
    TI__Mastermind 25100 points

    Hi James,

    James McKenna said:
    a separate UART TeraTerm connection on the SCIA pins to my PC

    The launchpad has a USB to UART adapter built in, so you should be able to communicate with your PC while just using the provided USB cable.

    James McKenna said:
    Could this have to do with the way the board is being programmed over the JTAG interface? I was testing with loopback before so maybe some part of that code are not being erased from the device?

    What is the status of JP6 and JP7? 

    Best Regards,

    Marlyn