feat(hardware): add lgpio GPIO backend for Raspberry Pi 5 - #10
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Add an `lgpio` backend alongside the existing `pigpio` one, with the same interface (`LgpioBarcodeSender` / `LgpioConnection` / `send_barcode_sequence`) so it is a drop-in alternative. `lgpio` is chardev-based, pip-installable, needs no daemon, and works on the Raspberry Pi 5 (RP1) where `pigpio` does not; pass `gpiochip=4` for the Pi 5. A barcode is emitted by driving the line with `gpio_write` and holding each segment with a monotonic busy-wait (sub-ms accurate for the ms-scale segments), so there is no wave/daemon layer to configure. Adds a `ttl-barcoder[lgpio]` extra, hardware-free tests that mock the lgpio module, and hardware docs covering both backends. On-rig timing verification pending (no GPIO in CI).
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Closes #1.
Adds an
lgpiohardware backend alongsidepigpio(drop-in interface:LgpioBarcodeSender/LgpioConnection/send_barcode_sequence), so barcode TTLs can be emitted on the Raspberry Pi 5 (RP1) and Pi 4 without the pigpio daemon.pigpiois unmaintained and incompatible with the Pi 5.ttl-barcoder[lgpio]extra;pigpiokept for legacy Pi 3/4 rigs.gpio_writewith a monotonic busy-wait per segment (sub-ms accurate for ms-scale barcode segments), using onlygpiochip_open/gpio_claim_output/gpio_write/gpiochip_close— matching the verifiedrpi-camera-ensembleusage. Passgpiochip=4for the Pi 5.docs/hardware.mddocuments both backends;tests/test_lgpio.pymocks lgpio (not in CI). Full suite green.On-rig timing verification pending (no GPIO in CI) — smoke-test on a real Pi 4 and Pi 5 before relying on the busy-wait timing.