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How do I/Can I use the USB UART on the LaunchPad XL2 (RM57Lx)?

Scott Dixon83
Prodigy 50 points

I built a demo using SCI1 on my RM57 and it works great. I'm wondering if and how to route an SCI interface through the virtual serial ports exposed via USB on this board. I can't find any obvious documentation on the subject.

  • 0
    TI__Guru 68920 points
    Scott,

    On the RM57L Launchpad, LIN1 (which can operate as a SCI / UART) is connected to the XDS110 debug probe where there is a USB<>UART function that gives you access to this UART over a virtual COM port.

    Note that the XDS110 enumerates with two virtual com ports. The one that is connected to LIN1 will be described as "XDS110 Class Application/User UART".
    Use this one, don't use the other one which is reserved for new debug features.

    -Anthony
  • 0 in reply to Anthony F. Seely
    Prodigy 50 points

    Huh. I'm sending characters using SCI1 and I can see this data on the GPIO pin LIN1_TX/UART_TX but neither of the UARTs available on the system repeat this data. It feels like I'm missing a configuration step. Is there a jumper, mux, or other register that needs to be set to enable this feature on the XDS110?

  • 0 in reply to Scott Dixon83
    TI__Guru 68920 points

    No jumper or mux.


    Are you connecting to the correct Virtual COM port and did you set the baud rate up to match the SCI/LIN?

    Make sure it's "XDS110 Class Application/User UART". for the COM port you try.


    Don't use the one labeled 'Auxiliary'.