LAUNCHXL-F28379D: Run USB virtual com port (CDC)

Part Number: LAUNCHXL-F28379D

Tool/software:

Hello everyone, I'm trying to get USB CDC working on the LAUNCHXL-F28379D VER 2.0. I modified the board and connected GPIO42 and GPIO43 pins to an external USB cable according to the datasheet. I also exported the usb_ex1_dev_serial example to my chip. After flashing the board and connecting it to the computer, I get the error:
"Windows has stopped this device because it has reported problems. (Code 43)

The USB device descriptor request failed."

Please help me figure this out.

  • The problem was the unconfigured AUXPLLCLK clock frequency. The demo has a commented-out line for setting this clock, but it doesn't work with the quartz crystal in my devboard. I configured it using .syscfg and the command:

    #include "clockTree.h"
    SysCtl_setAuxClock(DEVICE_SETAUXCLOCK_CFG);

    The AUXPLLCLK frequency should be 60 MHz.