62 lines
2.4 KiB
Markdown
62 lines
2.4 KiB
Markdown
# Ground Station
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Orange Pi Zero 3W supervisor and kiosk display for the custom OpenIPC/WFB ground station.
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## Components
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The ARM64 artifact intentionally contains two executables:
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- `groundstation-linux-arm64` — the long-running root supervisor. It owns the GX12 UART, logging, RC state, video lifecycle, and starts the display process.
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- `groundstation-display-linux-arm64` — the unprivileged X11 kiosk renderer. It runs as `orangepi` on `DISPLAY=:0`; the supervisor owns it during normal use.
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Current capabilities:
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- receives framed GX12 RC channel data at 115200 8N1;
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- validates protocol version, frame length and CRC-16;
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- logs channel changes instead of every frame;
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- starts/stops `fpv-video` from the configured CH6 power/lifecycle control;
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- starts an independent kiosk display before video, tolerates temporary X11 downtime without restarting the supervisor, and stops deterministically on shutdown;
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- keeps the fallback canvas below `fpv-video`, with `Brak połączenia WFB` while video is absent.
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Future MIPI/touch targets use their own template rather than sharing one global layout. Flight OSD will use a separate transparent layer above video, preserving the pilot stream's priority.
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## Installation on Orange Pi
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Extract the artifact and install **both** files:
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```bash
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sudo install -m 0755 groundstation-linux-arm64 /usr/local/bin/groundstation
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sudo install -m 0755 groundstation-display-linux-arm64 /usr/local/bin/groundstation-display
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sudo systemctl restart groundstation
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```
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Check logs:
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```bash
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systemctl status groundstation --no-pager
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journalctl -u groundstation -b --no-pager -n 80
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```
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Do not run `groundstation-display` by hand during normal operation. It needs the X11 user/session environment and is managed by the supervisor. For isolated renderer debugging it supports:
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```bash
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groundstation-display -target x11
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```
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## Configuration
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The service reads `/etc/groundstation/config.yml`. For the verified permanent GX12 connection, use:
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```yaml
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serial:
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path: /dev/ttyS2
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```
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`/dev/ttyS0` is the Orange Pi boot/debug UART and must not be used for the permanently connected GX12.
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## Runtime dependencies
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- X11 session on `:0` owned by `orangepi`; the kiosk waits for X11 and reconnects after display-manager restarts;
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- `wmctrl` for fullscreen/below kiosk state; without it the canvas maps as a normal window and the condition is logged;
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- `runuser` from util-linux for the unprivileged kiosk launch.
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