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How much differs the Solo to the Somu in regards of a Rust board support crate?

In other words: Can solo-bsc be used for the somu?

The biggest problem moving this effort forward is the lack of an embedded Rust USB stack: rust-embedded/wg#40

There is a port of @mvirkkunen's usb-device (implemented for stm32f103) to atsamd21, and another effort for stm32f0.

The goal is to have a clean, minimal Rust implementation, not a wrapper of an existing C implementation (e.g. the STMicroelectronics implementation or libopencm3). Studying https://github.com/dmitrystu/libusb_stm32 should prove helpful in finding all the details hidden "somewhere" in the datasheet and reference manual.