From e2bc77741093819da8b8235801e5567d01d129bf Mon Sep 17 00:00:00 2001
From: cscherr <Christoph.Scherr@newtec.de>
Date: Wed, 9 Jul 2025 15:12:10 +0200
Subject: [PATCH] chore: build and test shenanigans

---
 .cargo/config.toml        |  9 ++-------
 Cargo.toml                |  4 ++++
 build.rs                  |  9 ++++++---
 crates/crc/src/crc_dev.rs | 16 +++++++++++++++-
 crates/crc/src/lib.rs     |  2 ++
 scripts/test_crc.sh       |  5 +++++
 6 files changed, 34 insertions(+), 11 deletions(-)
 create mode 100755 scripts/test_crc.sh

diff --git a/.cargo/config.toml b/.cargo/config.toml
index b280dc1..dc51815 100755
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -1,15 +1,10 @@
-[build]
-# target = "thumbv6m-none-eabi"
-
-[test]
-target = "x86_64-unknown-linux-gnu"
-
 [target.thumbv6m-none-eabi]
 runner = 'probe-rs run --chip STM32L053R8'
 
 
 [alias]
-target = "thumbv6m-none-eabi"
+arun = "run --target thumbv6m-none-eabi"
+atest = "test --target x86_64-unknown-linux-gnu"
 cflash = "flash --chip STM32L053R8"
 
 [env]
diff --git a/Cargo.toml b/Cargo.toml
index ff3db82..abcd512 100755
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,10 @@ defmt = { version = "1.0.1" }
 defmt-rtt = { version = "1.0.0" }
 panic-probe = { version = "0.3", features = ["print-defmt"] }
 
+[features]
+default = ["buildscript"]
+buildscript = []
+
 [profile.release]
 debug = "full" # those are not on the board
 
diff --git a/build.rs b/build.rs
index 3987a39..972f524 100755
--- a/build.rs
+++ b/build.rs
@@ -1,5 +1,8 @@
 fn main() {
-    println!("cargo::rerun-if-changed=Cargo.toml");
-    println!("cargo::rustc-link-arg=-Tlink.x");
-    println!("cargo::rustc-link-arg=-Tdefmt.x");
+    #[cfg(feature = "buildscript")]
+    {
+        println!("cargo::rerun-if-changed=Cargo.toml");
+        println!("cargo::rustc-link-arg=-Tlink.x");
+        println!("cargo::rustc-link-arg=-Tdefmt.x");
+    }
 }
diff --git a/crates/crc/src/crc_dev.rs b/crates/crc/src/crc_dev.rs
index 4d75d4b..56c2512 100755
--- a/crates/crc/src/crc_dev.rs
+++ b/crates/crc/src/crc_dev.rs
@@ -1,9 +1,23 @@
+use crate::Crc;
+
+struct CrcDev;
+impl Crc for CrcDev {
+    type Input = [u8];
+    type Checksum = [u8; Self::CHECKSUM_LEN];
+    const CHECKSUM_LEN: usize = 4;
+
+    fn process(data: &Self::Input) -> Self::Checksum {
+        todo!()
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test]
     fn it_works() {
-        assert_eq!(2 + 2, 4);
+        let data = [0, 1, 2, 3, 4, 5, 6];
+        assert_eq!(CrcDev::process(&data), [1, 2, 3, 4])
     }
 }
diff --git a/crates/crc/src/lib.rs b/crates/crc/src/lib.rs
index 91b6a76..34884aa 100755
--- a/crates/crc/src/lib.rs
+++ b/crates/crc/src/lib.rs
@@ -1,3 +1,5 @@
+#![no_std]
+
 mod crc_32;
 pub use crc_32::*;
 
diff --git a/scripts/test_crc.sh b/scripts/test_crc.sh
new file mode 100755
index 0000000..76237f3
--- /dev/null
+++ b/scripts/test_crc.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+# I'm using a bash script because if i set the target in .cargo/config.toml 
+# i can't build for x86_64 anymore, which means I can't run the unit tests.
+TARGET="x86_64-unknown-linux-gnu"
+cargo test --target $TARGET -p crc --no-default-features