1. The development board adopts dual USB port design. One USB port is used for USB to TTL connection to the onboard CH340 chip as ISP programming; the other USB port is used for USB communication.
When plugged into the computer, it will pop up that the USB device cannot be recognized and changed, and the user needs to develop the USB protocol to use it. The USB protocol is more complicated, you can refer to the simulation of punctual atoms
Mouse routines.

2. There are pull-down resistors inside the BOT0 and BOT1 boards, so there is no need to insert jumper caps.

3. All external information of this product has been provided, please forgive me if some information cannot be provided.