Cargo.lock

@@ -1,7 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
 [[package]]
-name = "thermostat"
+name = "adc2tcp"
 version = "0.0.0"
 dependencies = [
  "bare-metal 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",

Cargo.toml

@@ -1,14 +1,18 @@
 [package]
 categories = ["embedded", "no-std"]
-name = "thermostat"
+name = "adc2tcp"
-description = "Thermostat firmware"
+description = "Poll ADC pin, report over TCP"
 license = "GPL-3.0-only"
 authors = ["Astro <astro@spaceboyz.net>"]
 version = "0.0.0"
-keywords = ["thermostat", "laser", "physics"]
+keywords = ["ethernet", "eth", "stm32", "adc", "tcp"]
-repository = "https://git.m-labs.hk/M-Labs/thermostat"
+repository = "https://github.com/m-labs/adc2tcp"
 edition = "2018"
 
+[badges]
+travis-ci = { repository = "astro/adc2tcp", branch = "master" }
+maintenance = { status = "experimental" }
+
 [package.metadata.docs.rs]
 features = []
 default-target = "thumbv7em-none-eabihf"

README.md

@@ -0,0 +1,67 @@
+# Synopsis
+
+Exposes readings from an ADC pin (currently: *PA3*) of the board via a
+TCP service on the Ethernet port.
+
+
+# Network Protocol
+
+Sensor readings produce lines of `key=value` pairs, joined by `,`,
+terminated by `"\r\n"`.
+
+```
+t=21000,pa3=685
+t=22000,pa3=684
+t=23000,pa3=681
+t=24000,pa3=696
+t=25000,pa3=673
+t=26000,pa3=689
+t=27000,pa3=657
+t=28000,pa3=654
+t=29000,pa3=652
+t=30000,pa3=662
+t=31000,pa3=663
+```
+
+| Key | Value       | Unit |
+|:---:|-------------|------|
+| t   | Time        | ms   |
+| pa3 | ADC reading | mV   |
+
+
+# LEDs
+
+Colors indicate what the MCU is occupied with.
+
+| Color   | Indication        |
+|:-------:|-------------------|
+| Green   | WFI (idle)        |
+| Blue    | Network poll      |
+| Red     | Message broadcast |
+
+
+# Crate features
+
+* `semihosting` enables log output via the **cortex-m-semihosting**
+  crate. Use only in development! MCU will hang when no OpenOCD is
+  running.
+
+* `generate-hwaddr` generates an Ethernet MAC address by hashing the
+  unique device ID from flash memory.
+
+
+# Instructions
+
+![Made for NixOS](https://nixos.org/logo/nixos-lores.png)
+
+## Build the firmware with `default.nix`
+
+* `nix-build`
+* This uses **cargo-vendor** to bundle dependencies, so that unstable versions from git can be used.
+* Run `result/bin/flash-adc2tcp` to flash a devboard with OpenOCD and quit.
+
+## Development environment with `shell.nix`
+
+* `nix-shell`
+* Spawning `openocd`, the devboard should be connected already.
+* Instructions (`cargo run --release`) are printed.

default.nix

@@ -0,0 +1,47 @@
+{ # Use master branch of the overlay by default
+  mozillaOverlay ? import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz),
+  rustManifest ? builtins.fetchurl "https://static.rust-lang.org/dist/channel-rust-nightly.toml"
+}:
+
+let
+  pkgs = import <nixpkgs> { overlays = [ mozillaOverlay ]; };
+in
+with pkgs;
+let
+  rustPlatform = recurseIntoAttrs (callPackage ./nix/rustPlatform.nix {
+    inherit rustManifest;
+  });
+  adc2tcp = callPackage ./nix/adc2tcp.nix { inherit rustPlatform; };
+  openocd = callPackage ./nix/openocd.nix {};
+in
+stdenv.mkDerivation {
+  name = "adc2tcp-dist";
+  buildInputs = [
+    adc2tcp
+    openocd
+    makeWrapper
+  ];
+  src = ./.;
+  dontBuild = true;
+
+  installPhase =
+    let
+      firmwareBinary = "$out/lib/adc2tcp.elf";
+      openOcdFlags = [
+        "-c" "reset halt"
+        "-c" "flash write_image erase ${firmwareBinary}"
+        "-c" "verify_image ${firmwareBinary}"
+        "-c" "reset run"
+        "-c" "shutdown"
+      ];
+    in ''
+      mkdir -p $out/bin $out/lib $out/nix-support
+
+      ln -s ${adc2tcp}/lib/adc2tcp ${firmwareBinary}
+
+      makeWrapper ${openocd}/bin/openocd-nucleo-f429zi $out/bin/flash-adc2tcp \
+        --add-flags "${lib.escapeShellArgs openOcdFlags}"
+
+      echo file binary-dist ${firmwareBinary} >> $out/nix-support/hydra-build-products
+    '';
+}

nix/adc2tcp.nix

@@ -0,0 +1,45 @@
+{ stdenv, rustPlatform, cacert, git, cargo-vendor }:
+
+with rustPlatform;
+let
+  sha256 = "1i9p5d5n01ajbp8lmavyway6vr1mmy107qnccff9glvr91rqx352";
+  fetchcargo = import ./fetchcargo.nix {
+    inherit stdenv cacert git cargo-vendor;
+    inherit (rust) cargo;
+  };
+  adc2tcpDeps = fetchcargo {
+    name = "adc2tcp";
+    src = ../.;
+    inherit sha256;
+  };
+in
+
+buildRustPackage rec {
+  name = "adc2tcp";
+  version = "0.0.0";
+
+  src = ../.;
+  cargoSha256 = sha256;
+
+  buildInputs = [ adc2tcpDeps ];
+  patchPhase = ''
+    cat >> .cargo/config <<EOF
+    [source.crates-io]
+    replace-with = "vendored-sources"
+
+    [source.vendored-sources]
+    directory = "${adc2tcpDeps}"
+    EOF
+  '';
+
+  buildPhase = ''
+    export CARGO_HOME=$(mktemp -d cargo-home.XXX)
+    cargo build --release
+  '';
+
+  doCheck = false;
+  installPhase = ''
+    mkdir -p $out/lib
+    cp target/thumbv7em-none-eabihf/release/adc2tcp $out/lib/
+  '';
+}

nix/fetchcargo.nix

@@ -0,0 +1,49 @@
+{ stdenv, cacert, git, cargo, cargo-vendor }:
+{ name, src, sha256 }:
+let
+  # `src` restricted to the two files that define dependencies
+  cargoOnlySrc = stdenv.mkDerivation {
+    name = "${name}-cargo";
+    inherit src;
+    phases = "installPhase";
+    installPhase = ''
+      mkdir $out
+      cp ${src}/Cargo.{toml,lock} $out/
+      mkdir $out/src
+      touch $out/src/main.rs
+    '';
+  };
+in
+stdenv.mkDerivation {
+  name = "${name}-vendor";
+  nativeBuildInputs = [ cacert git cargo cargo-vendor ];
+  src = cargoOnlySrc;
+
+  phases = "unpackPhase patchPhase installPhase";
+
+  installPhase = ''
+    if [[ ! -f Cargo.lock ]]; then
+        echo
+        echo "ERROR: The Cargo.lock file doesn't exist"
+        echo
+        echo "Cargo.lock is needed to make sure that cargoSha256 doesn't change"
+        echo "when the registry is updated."
+        echo
+
+        exit 1
+    fi
+
+    export CARGO_HOME=$(mktemp -d cargo-home.XXX)
+
+    cargo vendor
+
+    cp -ar vendor $out
+  '';
+
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = sha256;
+
+  impureEnvVars = stdenv.lib.fetchers.proxyImpureEnvVars;
+  preferLocalBuild = true;
+}

nix/openocd.nix

@@ -0,0 +1,24 @@
+{ stdenv, lib, openocd, makeWrapper }:
+
+stdenv.mkDerivation {
+  name = "openocd-nucleo-f429zi";
+  buildInputs = [
+    openocd
+    makeWrapper
+  ];
+  src = openocd;
+  noBuild = true;
+  installPhase =
+    let
+      openOcdFlags = [
+        "-f" "${openocd}/share/openocd/scripts/interface/stlink-v2-1.cfg"
+        "-f" "${openocd}/share/openocd/scripts/target/stm32f4x.cfg"
+        "-c" "init"
+      ];
+    in ''
+      mkdir -p $out/bin
+
+      makeWrapper ${openocd}/bin/openocd $out/bin/openocd-nucleo-f429zi \
+        --add-flags "${lib.escapeShellArgs openOcdFlags}"
+    '';
+}

nix/rustPlatform.nix

@@ -0,0 +1,27 @@
+{ recurseIntoAttrs, stdenv, lib,
+  makeRustPlatform,
+  fetchurl, patchelf,
+  rustManifest ? ./channel-rust-nightly.toml
+}:
+
+let
+  targets = [
+    # "x86_64-unknown-linux-gnu"
+    # "thumbv6m-none-eabi"
+    # "thumbv7m-none-eabi"
+    # "thumbv7em-none-eabi"
+    "thumbv7em-none-eabihf"
+  ];
+  rustChannel =
+    lib.rustLib.fromManifestFile rustManifest {
+      inherit stdenv fetchurl patchelf;
+    };
+  rust =
+    rustChannel.rust.override {
+      inherit targets;
+    };
+in
+makeRustPlatform {
+  rustc = rust;
+  cargo = rust;
+}

release.nix

@@ -0,0 +1,15 @@
+# For running on Hydra
+{ pkgs ? import <nixpkgs> {},
+  rustManifest ? ./nix/channel-rust-nightly.toml
+}:
+
+with pkgs;
+let
+  adc2tcp = callPackage ./default.nix {
+    inherit rustManifest;
+    mozillaOverlay = import <mozillaOverlay>;
+  };
+in
+{
+  build = lib.hydraJob adc2tcp;
+}

shell.nix

@@ -0,0 +1,30 @@
+{ rustChannel ? "nightly" }:
+
+let
+  mozillaOverlay = import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz);
+  pkgs = import <nixpkgs> { overlays = [ mozillaOverlay ]; };
+in
+with pkgs;
+let
+  rustPlatform = callPackage ./nix/rustPlatform.nix {};
+  openocd = callPackage ./nix/openocd.nix {};
+in
+stdenv.mkDerivation {
+  name = "adc2tcp-env";
+  buildInputs = with rustPlatform.rust; [
+    rustc cargo pkgs.gdb
+  ];
+
+  # Set Environment Variables
+  RUST_BACKTRACE = 1;
+
+  shellHook = ''
+    echo "Starting openocd…"
+    ${openocd}/bin/openocd-nucleo-f429zi &
+
+    # Let openocd output scroll by
+    sleep 1
+
+    echo "Run 'cargo run --release --features=semihosting'"
+  '';
+}

src/main.rs

@@ -67,7 +67,7 @@ fn init_log() {
 #[entry]
 fn main() -> ! {
     init_log();
-    info!("Thermostat firmware");
+    info!("adc2tcp");
 
     let mut cp = CorePeripherals::take().unwrap();
     cp.SCB.enable_icache();