default.nix: produce a card10.bin

Cargo.lock

+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+
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default.nix

@@ -10,17 +10,24 @@ let
     rustc = rust;
     cargo = rust;
   };
+  py-crc16 = callPackage ./python-crc16.nix {};
   firmware = rustPlatform.buildRustPackage rec {
     name = "rust-card10";
     version = "0.0.0";
     src = ./.;
     cargoSha256 = "04blshy2c4xms9v8ik921qs3ym4vq8rsx8pw78brw7r88x6lx01a";
-    buildInputs = [ pkgsCross.armhf-embedded.stdenv.cc ];
+    buildInputs = [ py-crc16 ] ++
+      (with pkgsCross.armhf-embedded.stdenv; [
+        cc binutils
+      ]);
     preBuild = "export CARGO_HOME=$(mktemp -d cargo-home.XXX)";
     doCheck = false;
     installPhase = ''
       mkdir -p $out/lib
       cp target/thumbv7em-none-eabihf/release/watchapp $out/lib/
+
+      arm-none-eabihf-objcopy -O binary $out/lib/watchapp $out/lib/card10.bin
+      ${python3}/bin/python c/bootloader/crc_patch.py $out/lib/card10.bin
     '';
   };
 in {

python-crc16.nix

+{ python3Packages }:
+
+python3Packages.buildPythonPackage rec {
+  pname = "crc16";
+  version = "0.1.1";
+  src = python3Packages.fetchPypi {
+    inherit pname version;
+    sha256 = "15nkx0pa4lskwin84flpk8fsw3jqg6wic6v3s83syjqg76h6my61";
+  };
+}