This project uses https://github.com/rikka0w0/CH55x_USB_CDC (this part uses the MIT protocol) as the underlying template to create and implement a USB virtual serial port, and combines it with https://github.com/DT9025A/STC8G-AVRISP (the Part of the AVR-ISP project using BSD protocol) implements a virtual USB AVR-ISP download tool based on CH554, with a default baud rate of 19200
Open source address
https://gitee.com/createskyblue/Ch554-AVR-ISP
https://github.com/createskyblue/Ch554-AVR-ISP
Please modify ./usb_string_desc.c
And in order to correctly display the customized serial port name in the device manager, please use Zadig software to replace the driver with USB Serial (CDC)
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