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README.md
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README.md
@ -13,11 +13,28 @@ The used OLED display is from [Waveshare](https://www.waveshare.com/wiki/1.5inch
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> scp target/arm-unknown-linux-musleabihf/release/{display_all,display_off,refresh_json,take_measurement,status_check_example} 'pi@raspberrypi:~'
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> # on the Pi, create sensors.db and events.json
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> ./status_check_example > /run/user/1000/status.json
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> patchelf --set-interpreter /lib/ld-linux-armhf.so.3 display_all
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> patchelf --set-interpreter /lib/ld-musl-armhf.so.1 display_all
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> ./display_off on
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> ./display_all sensors.db events.json temps
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```
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### Cross compile from NixOS x86_64
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Make sure to configure nixpkgs and [nur](https://github.com/nix-community/NUR) below.
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```bash
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> nix-build -I nixpkgs=.../nixpkgs -I nur=.../nur-packages --arg crossSystem '(import <nixpkgs/lib>).systems.examples.muslpi' .../nur-packages -A raspi-oled-cross
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> mkdir /tmp/nixstore
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> nix copy --extra-experimental-features nix-command --extra-experimental-features flakes --no-check-sigs --to /tmp/nixstore $(readlink -f result)
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> rsync -r --links --info=progress --compress /tmp/nixstore/nix pi@himbeere-null:~/
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```
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On the Pi:
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```bash
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> sudo mv nix /
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> sudo patchelf --set-interpreter /lib/ld-musl-armhf.so.1 /nix/store/*-raspi-oled-*-infdev-*/bin/*
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```
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## Example
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![temperature graph](./images/temps.png)
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