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Question to SCI USB Bridge

Patrick Schneider1
Intellectual 655 points

Hello,

at first my setup:

Hardware: LAUNCHXL-F28027 with BOOSTXL-DRV8301 and the shipped Telco motor

IDE: Code Composer Studio 6.0.0.00190 and GUI Composer 1.0.0.201308252300 (rcp-main)

Software: I'm using a slightly modified LAB10A (sending status via sci)

My question:

The SCI seems not working when Code Composer Studio is not running. If I flash the software and let it run status is delivered via SCIA. If I terminate the debug session the status is still delivered. But if I replug the Launchpad to USB I got no SCIA communication at all.

Does the USB to SCIA Bridge in the emulator somehow need to be activated? Is CCS doing that while connecting? How can I do it manually.

Short: Serial communication through USB is only possible after a Code Composer Studio connect has been established and not after Reset.

  • 0
    TI__Mastermind 22025 points

    Patrick,

    CCS shouldn't be doing anything with the configuration of the XDS100, so I'm a little surprised at what you are seeing.

    That said, yes there is an option you need to check in the driver setup for the device in order to enable the virtual com port functionality.  Go to Device Manager and right click on the TI XDS100 Channel B, select properties.  In the box that opens, click on the advanced tab and select "Load VCP".  This will ensure that the second channel is always enabled for serial communications.

    Let me know if that fixes your problem.

    BR,

  • 0 in reply to Trey German289
    Intellectual 655 points

    Hello Trey,

    sadly that doesn't help. That box was already checked. Same behaviour as always. I load the program with CCS and SCIA works. I just plug it in, software runs but no SCIA com.

    Regards,

    Patrick

  • 0 in reply to Patrick Schneider1
    TI__Mastermind 22025 points

    Patrick,

    Interesting...To figure this out we need to start going through the signal chain from the SCIA all the way up to the COM ports in the OS.

    Try the following:

    1. Scope the SCIA pins on the board.  Are they still sending out data?  Is the baudrate different when it works and when it doesn't work?
    2. Do the SCI lights always flash on the LaunchPad?  This indicates that the XDS100 is correctly recieving and sending serial data.
    3. On the PC, does the COM port always show up in device manager?

    I suspect we'll find the problem after looking at the above items.

    BR,

  • 0 in reply to Trey German289
    Intellectual 655 points

    Hello Trey,

    first, thank you for your support. Since yesterday we got our own devkits so there is no further need to investigate in this issue. We just would have needed it to continue our testing last week with the launchpads.

    But thank you anyway, perhaps this thread helps other people with a similar problem. 

    I'm marking this as solved for now.

    Best regards,