feat(firmware): add project skeleton

firmware/.cargo/config.toml

@@ -0,0 +1,12 @@
+[build]
+target = "riscv32ec-unknown-none-elf"
+
+[target.riscv32ec-unknown-none-elf]
+runner = "wlink -v flash"
+rustflags = [
+  "-C", "link-arg=-Tlink.x",
+  "-C", "opt-level=s",
+]
+
+[unstable]
+build-std = ["core", "compiler_builtins"]

firmware/.gitignore

@@ -0,0 +1,14 @@
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb

firmware/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "fosmometer-firmware"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+ch32v00x-hal = { git = "https://github.com/lujoga/ch32v00x-hal.git", branch = "qingke-rt", features = ["ch32v003", "rt"] }
+panic-halt = "0.2.0"
+qingke-rt = "0.1.7"

firmware/src/main.rs

@@ -0,0 +1,11 @@
+#![no_std]
+#![no_main]
+
+use ch32v00x_hal as hal;
+
+use panic_halt as _;
+
+#[qingke_rt::entry]
+fn main() -> ! {
+    loop {}
+}