I have a spare STM32F407 motherboard, and I want to flash the klipper firmware, but the pins set by his USB serial are OTG-HS PB14/PB15.
But in klipper’s menuconfig, you can only see that STM32F407 is configured with PA11/PA12.
In src, I find config STM32_USB_PB14_PB15 on MACH_STM32H743 || MACH_STM32H750.
How can I configure it so that I can use PB14/PB15 as a USB serial port in STM43F407？
The “OTG HS” controller is different from the commonly used “OTG FS” controller. A developer would need to look at it to see what changes are necessary to support it on the stm3f4 chips. I don’t know of anyone currently working on that.
-Kevin