Read from hardcoded serial port

.cargo/config

@@ -0,0 +1,13 @@
+[target.'cfg(feature = "cargo-clippy")']
+rustflags = [
+    "-Dwarnings",
+    "-Dclippy::pedantic",
+    "-Dclippy::nursery",
+    "-Dclippy::cargo",
+]
+
+[target.armv7-unknown-linux-gnueabihf]
+linker = "arm-linux-gnueabihf-gcc"
+
+[target.aarch64-unknown-linux-gnu]
+linker = "aarch64-linux-gnu-gcc"

.gitignore

@@ -0,0 +1 @@
+/target

.woodpecker.yml

@@ -0,0 +1,30 @@
+pipeline:
+  fmt:
+    group: default
+    image: rust_full
+    commands:
+      - cargo fmt --all -- --check
+
+  clippy:
+    group: default
+    image: rust_full
+    commands:
+      - cargo clippy --all-features
+
+  doc:
+    group: default
+    image: rust_full
+    commands:
+      - cargo doc --all-features
+
+  build:
+    group: default
+    image: rust_full
+    commands:
+      - cargo build --all-features
+
+  build_release:
+    group: release
+    image: rust_full
+    commands:
+      - cargo build --all-features --release

Cargo.lock

@@ -0,0 +1,198 @@
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+ "winapi",
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+ "winapi-x86_64-pc-windows-gnu",
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Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "mightyohm-gc-exporter"
+version = "0.1.0-dev"
+edition = "2021"
+description = "Prometheus exporter for the MightyOhm Geiger Counter"
+license = "GPL-3.0-or-later"
+repository = "https://git.onders.org/finga/mightyohm-gc-exporter"
+keywords = ["prometheus", "metrics"]
+categories = ["api-bindings", "command-line-utilities", "visualization"]
+
+[dependencies]
+serialport = "4.1"

README.md

@@ -0,0 +1,15 @@
+# Exporter for the MightyOhm Geiger Counter [![status-badge](https://ci.onders.org/api/badges/finga/mightyohm-gc-exporter/status.svg)](https://ci.onders.org/finga/mightyohm-gc-exporter)
+A Prometheus exporter for the [MightyOhm Geiger Counter](https://mightyohm.com/blog/products/geiger-counter/).
+
+## Build
+### Same architecture as system
+To compile it for the same architecture as the build system:
+```sh
+cargo build --release
+```
+
+### Cross-compile for aarch64 (recent RaspberryPi)
+To cross-compile it for RaspberryPi:
+```sh
+PKG_CONFIG_SYSROOT_DIR=/usr/aarch64-linux-gnu cargo build --target aarch64-unknown-linux-gnu --release
+```

src/main.rs

@@ -0,0 +1,34 @@
+use std::{
+    io::{self, Write},
+    time::Duration,
+};
+
+fn main() {
+    let port_name = "/dev/serial0";
+    let baud_rate = 9600;
+
+    let port = serialport::new(port_name, baud_rate)
+        .timeout(Duration::from_millis(100))
+        .open();
+
+    match port {
+        Ok(mut port) => {
+            let mut serial_buf: Vec<u8> = vec![0; 1000];
+            println!("Receiving data on {} at {} baud:", &port_name, &baud_rate);
+            loop {
+                match port.read(serial_buf.as_mut_slice()) {
+                    Ok(t) => io::stdout().write_all(&serial_buf[..t]).unwrap(),
+                    Err(ref e) if e.kind() == io::ErrorKind::TimedOut => (),
+                    Err(e) => {
+                        eprintln!("Failed to read \"{}\". Error: {}", port_name, e);
+                        ::std::process::exit(1);
+                    }
+                }
+            }
+        }
+        Err(e) => {
+            eprintln!("Failed to open \"{}\". Error: {}", port_name, e);
+            ::std::process::exit(1);
+        }
+    }
+}