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LAUNCHXL-F28379D: Issue with SCI UART connection when not in debug mode

Part Number: LAUNCHXL-F28379D
Other Parts Discussed in Thread: C2000WARE

Hello everyone

I have issues communicating with a LAUNCHXL-F28379D launchpad using the serial connection when I am not connected to the microcontroller in CCS in debug mode. I am using the Flash build option and all of the code and data should be loaded into Flash. When flashing the device by entering the debug mode in CCS, everything works fine. If I disconnect the Launchpad and try to connect to it again using Putty I do not receive any characters.

Some more things I checked:

  • The UART signal can be measured on the trace and has the correct baud rate
  • The microcontroller seems to be running normally since it periodically toggles a GPIO in its superloop.
  • "SCI_getRxFIFOStatus(SCIA_BASE)" always seems to return 0 when I am not debugging via CCS
  • Boot mode pins are in position 111 (e.g. Emulation Boot)

I am not sure what could be causing this issue?