User ArcaneNibble on GitHub has coded a UF2 bootloader for chips from WCH like the CH32V2xx and CH32V3xx series RISC-V microcontrollers.
This code implements a UF2 bootloader for RISC-V microcontrollers from WCH. This allows user-friendly uploading of code by dragging files onto a virtual USB Mass Storage device (i.e. a pretend thumb drive). This means that, unlike the vendor ISP bootloader, no special software is required.
See details on GitHub.
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