USBDevice/CDC Standalone Example not working USB FS

[arduo]

Hi,

i tried to use the USB Device CDC Standalone example to make my MCU (STM32F407iG) working as a USB TO Serial Converter Bridge like a PL2303TA Chip. But somehow the USB FS doesn't connect to my PC. What am i doing wrong do i need to change the clock?

[S.Ma]

Usb needs 48mhz clock with a certain precision, check this point.

[MishaT]

Can you still try increasing min.heap size and min.stack size