In addition to the generic crates, there are also crates for popular ATSAMD21 based development boards. They aim to rename pins to match silk screens or Arduino pin assignments, add helpers for initialization, and re-export the atsamd21-hal crate.
It appears Wez will also target Rust on the larger SAMD51 chips, used in the Adafruit Feather M4 Express, ItsyBitsy M4 Express, Metro M4 Express, and NeoTrellis M4 also.
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