PAC for SAMC21J, built on demand

boards/atsamc21_xpro/.cargo/config

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+# samd21 is a Cortex-M0 and thus thumbv6m
+
+[build]
+target = "thumbv6m-none-eabi"
+rustflags = [
+   # This is needed if your flash or ram addresses are not aligned to 0x10000 in memory.x
+   # See https://github.com/rust-embedded/cortex-m-quickstart/pull/95
+   "-C", "link-arg=--nmagic",
+   "-C", "link-arg=-Tlink.x",
+]
+
+[target.thumbv6m-none-eabi]
+runner = 'arm-none-eabi-gdb'
+#runner = 'probe-run --chip ATSAMC21J18A'

boards/atsamc21_xpro/CHANGELOG.md

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+# Unreleased
+
+- Initial version
+
+---
+
+Changelog tracking started at v0.0.0

boards/atsamc21_xpro/Cargo.toml

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+[package]
+name = "atsamc21_xpro"
+version = "0.0.0"
+authors = [
+    "Jeremy Boynes <[email protected]>"
+]
+description = "Board Support crate for the SAM C21 Xplained Pro Evaluation Kit"
+keywords = ["no-std", "arm", "cortex-m", "embedded-hal"]
+categories = ["embedded", "hardware-support", "no-std"]
+license = "MIT OR Apache-2.0"
+edition = "2021"
+repository = "https://github.com/atsamd-rs/atsamd"
+readme = "README.md"
+
+# for cargo flash
+[package.metadata]
+chip = "ATSAMC21J18A"
+
+[dependencies]
+cortex-m = "0.7.6"
+cortex-m-rt = { version = "0.7", optional = true }
+
+[dependencies.atsamc21j]
+path = "../../pac/atsamc21j"
+
+[dev-dependencies]
+cortex-m = "0.7.6"
+panic-halt = "0.2"
+panic-semihosting = "0.6"
+
+[features]
+default = ["rt"]
+rt = ["cortex-m-rt", "atsamc21j/rt"]
+
+[profile.dev]
+incremental = false
+codegen-units = 1
+debug = true
+lto = true
+
+[profile.release]
+lto = true
+opt-level = "s"
+
+[[example]]
+name = "blinky_pac"

boards/atsamc21_xpro/README.md

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+# SAM C21 Xplained Pro Evaluation Kit Board Support Crate
+
+This crate provides a type-safe Rust API for working with the
+[SAM C21 Xplained Pro Evaluation Kit](https://www.microchip.com/developmenttools/productdetails/atsamc21_xpro).
+
+## Board Features
+
+- Microchip [ATSAMC21J18A] Cortex-M0 microcontroller @ 48 MHz (32-bit, 3.3V or 5V logic and power)
+  - 256kB Flash
+  - 32kB SRAM
+  - CAN and LIN interfaces
+
+## Prerequisites
+* Install the cross compile toolchain `rustup target add thumbv6m-none-eabi`
+
+## Uploading an example
+Check out the repository for examples:
+
+https://github.com/atsamd-rs/atsamd/tree/master/boards/atsamc21_xpro/examples
+
+* Be in this directory `cd boards/atsamc21_xpro`
+* Build and upload in one step
+```
+$ cargo flash --example blinky_pac --chip-description-path SAMC21.yaml --chip ATSAMC21J18A
+    Finished dev [unoptimized + debuginfo] target(s) in 7.56s
+    Flashing .../boards/atsamc21_xpro/target/thumbv6m-none-eabi/debug/examples/blinky_pac
+     Erasing sectors ✔ [00:00:00] [#######################] 16.00 KiB/16.00 KiB @ 91.94 KiB/s (eta 0s )
+ Programming pages   ✔ [00:00:00] [##########################] 2.00 KiB/2.00 KiB @ 5.79 KiB/s (eta 0s )    Finished in 0.593s
+$
+```