Initial commit.

According to: rust-lang/rust#109000 (comment)'

.cargo/config.toml

@@ -0,0 +1,10 @@
+rustflags = ["-Z emit-stack-sizes"]
+
+[target.avr-atmega328p]
+runner = "qemu-system-avr -M uno -nographic -serial tcp::5678,server=on -bios"
+
+[build]
+target = "avr-atmega328p.json"
+
+[unstable]
+build-std = ["core"]

Cargo.toml

@@ -0,0 +1,37 @@
+[package]
+name = "avr-bug"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+panic-halt = "0.2.0"
+ufmt = "0.1.0"
+noble-secp256k1 = { git = "https://github.com/xphoniex/noble-secp256k1-rs", default-features = false, features = ["8-bit"] }
+hmac-sha256 = { version = "1.1.6", default-features = false, features = ["opt_size"] }
+
+[dependencies.arduino-hal]
+git = "https://github.com/rahix/avr-hal"
+rev = "4c9c44c314eb061ee20556ef10d45dea36e75ee4"
+features = ["arduino-uno"]
+
+[dependencies.avr-device]
+version = "0.5.0"
+
+[profile.dev]
+panic = "abort"
+debug = true
+lto = true
+opt-level = "s"
+
+[profile.release]
+panic = "abort"
+codegen-units = 1
+debug = true
+lto = true
+#opt-level = "s"
+#opt-level = "z"
+opt-level = 2
+strip = true
+
+[profile.dev.package.compiler_builtins]
+overflow-checks = false

avr-atmega328p.json

@@ -0,0 +1,31 @@
+{
+  "arch": "avr",
+  "atomic-cas": false,
+  "cpu": "atmega328p",
+  "data-layout": "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8",
+  "eh-frame-header": false,
+  "exe-suffix": ".elf",
+  "executables": true,
+  "late-link-args": {
+    "gcc": [
+      "-lgcc"
+    ]
+  },
+  "linker": "avr-gcc",
+  "linker-is-gnu": true,
+  "llvm-target": "avr-unknown-unknown",
+  "max-atomic-width": 8,
+  "no-default-libraries": false,
+  "pre-link-args": {
+    "gcc": [
+      "-mmcu=atmega328p",
+      "-Wl,--as-needed,--print-memory-usage,--detailed-mem-usage",
+      "-fpack-struct",
+	  "-fshort-enums",
+	  "-Wstack-usage=20",
+	  "-Wall","-Wextra","-fstack-usage"
+    ]
+  },
+  "target-c-int-width": "16",
+  "target-pointer-width": "16"
+}

rust-toolchain.toml

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+[toolchain]
+channel = "nightly"
+components = [ "rust-src" ]
+profile = "minimal"