Initial Setup for the microbit v1

Cargo.toml

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+[package]
+authors = ["Lionel Sambuc <lionel.sambuc@gmail.com>"]
+name = "template-microbit"
+edition = "2021"
+version = "0.1.0"
+
+[lib]
+harness = false
+
+# needed for each integration test
+[[test]]
+name = "integration"
+harness = false
+
+[dependencies.microbit-v2]
+version = "0.15.1"
+optional = true
+
+[dependencies.microbit]
+version = "0.15.1"
+optional = true
+
+[dependencies]
+cortex-m = { version = "0.7", features = ["critical-section-single-core", "inline-asm"] }
+cortex-m-rt = "0.7"
+#cortex-m-semihosting = "0.5.0"
+#panic-halt = "0.2.0"
+panic-rtt-target = "0.1"
+
+defmt = "0.3"
+# Either rtt-target or defmt-rtt
+#rtt-target = "0.5"
+defmt-rtt = "0.4"
+panic-probe = { version = "0.3", features = ["print-defmt"] }
+
+embedded-hal = "1.0.0"
+embedded-alloc = "0.6.0"
+
+[dev-dependencies]
+defmt-test = "0.3"
+
+[features]
+default = ["v1"]
+v2 = ["microbit-v2"]
+v1 = ["microbit"]
+
+# cargo build/run
+[profile.dev]
+codegen-units = 1
+debug = 2
+debug-assertions = true # <-
+incremental = false
+opt-level = 'z'         # <-
+overflow-checks = true  # <-
+
+# cargo test
+[profile.test]
+codegen-units = 1
+debug = 2
+debug-assertions = true # <-
+incremental = false
+opt-level = 3           # <-
+overflow-checks = true  # <-
+
+# cargo build/run --release
+[profile.release]
+codegen-units = 1
+debug = 2
+debug-assertions = false # <-
+incremental = false
+lto = 'fat'
+opt-level = 3            # <-
+overflow-checks = false  # <-
+
+# cargo test --release
+[profile.bench]
+codegen-units = 1
+debug = 2
+debug-assertions = false # <-
+incremental = false
+lto = 'fat'
+opt-level = 3            # <-
+overflow-checks = false  # <-
+