编译arduino内置案例StandardFirmata时报错如下，怎解？

[pythoniot]

StandardFirmata-USB2FMT.ino:28:
C:\Users\15001\AppData\Local\Arduino15\libraries\Servo\src/Servo.h:81:2: error: #error "This library only supports boards with an AVR, SAM, SAMD, NRF52, STM32F4, Renesas or XMC processor."
#error "This library only supports boards with an AVR, SAM, SAMD, NRF52, STM32F4, Renesas or XMC processor."

[maxint-rd]

When compiling the Arduino built-in case StandardFirmata, the following error message appears. How to solve it?
...
Servo.h:81:2: error: #error "This library only supports boards with an AVR, SAM, SAMD, NRF52, STM32F4, Renesas or XMC processor."

I believe that the Arduino servo library is not supported (yet). Your issue is similar to issue #30 and #139. See those issues for comment and more info.

How to solve? Someone needs to change it to support CH32. Perhaps having PWM will help, but it still needs to be done.
Don't expect WCH to do this. I'm afraid it's up to the community to make a compatible library.