README: build instructions

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Astro 2019-09-18 00:29:29 +02:00
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# Thermostat v1 prototype firmware
## Building
### On Debian-based systems
- install rustup
```shell
apt install gcc gcc-arm-none-eabi git-core
rustup toolchain install nightly
rustup update
rustup target add thumbv7em-none-eabihf --toolchain nightly
rustup default nightly
rustup component add rust-src
cargo install cargo-xbuild
git clone https://github.com/llvm/llvm-project.git
export RUST_COMPILER_RT_ROOT=`pwd`/llvm-project/compiler-rt
cd firmware && cargo xbuild --release
```
The built ELF file will be at `target/thumbv7em-none-eabihf/release/ionpak-firmware`
### Development build on NixOS
Requires NixOS 19.09 or later for cargo-xbuild.
```shell
nix-shell --run "cd firmware && cargo xbuild --release"
```
## Network
### Setup