I cannot make the CDC virtual serial port on my Blue Pill (STM32F103C8T6) work when using Arduino IDE and the 'STM32 MCU based boards' board manager library.
I am using Arduino IDE 2.0.3, Additional boards manager URL of https://github.com/stm32duino/BoardManagerFiles/raw/main/package_stmicroelectronics_index.json, ST-LINK V2 programmer.
Board selection choices are: Board = Generic STM32F1 Series, Board part number = BluePill F103C8, USB support (if available) = CDC (Generic 'Serial' supercede U(S)ART), U(S)ART support = Enabled (generic 'Serial'). Upload method is STMCubeProgrammer (SWD).
The interesting case is trying to use the blinky example - it builds but nothing happens after programming. If I simply change 'USB support (if available)' to 'None', blinking works.
I know that electrically the USB CDC serial works because I retrieved 'pill_serial' from github (GitHub - satoshinm/pill_serial: Triple USB-to-serial adapter firmware for flashing onto an STM32F103C8T6 "blue pill" minimum development board ⛺), built it with 'STMicroelectronics STM32CubeIDE 1.11.0', and programmed it onto the Blue Pill with STM32CubeProgrammer. I am able to see the Black Magic Debug Probe in Windows Device manager.
So, it seems that selecting USB support (if available) = CDC (Generic 'Serial' supercede U(S)ART) causes the Blue Pill to completely hang.
Can someone help me figure out what I am doing wrong or what I need to change to get this to work? Any thoughts or help is greatly appreciated.