I want to use USB debugger only.
When this code in device.h,
#define DEBUGGER_FORCE_API STM32F4_UsbDevice_GetRequiredApi()
#define DEBUGGER_FORCE_INDEX USB_DEBUGGER_INDEX
It not working because configuration value is empty.
For now you’ll have to edit STM32F4_Startup yourself to force a configuration value.
Similar problem also if you force api and index