STM32_USB_CH341

STM32 USB simulates CH341.（STM32F103.PD0 connect 1.5k then connect D+)

Why CH341?

ST's USB virtual com port demo's driver have no signature(difficult to install).
The driver of CH341 is easy to install.
I feel bored.

It's not very difficult to develop. I just referred to the linux usb driver of ch341. You can simulate other chips in the same way.