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CI check: ESP32-S3 USB bridge backend - #1
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cheetahdotcat wants to merge 7 commits into
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cheetahdotcat wants to merge 7 commits into
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Add BackendKind::esp32_bridge. An ESP32-S3 running the bridge firmware enumerates as a composite USB device: a CDC-ACM control port plus two slots that hold an XInput pad, a HID pad (DualSense, DualShock 4, Switch Pro), or a shared keyboard and mouse. The host binds its inbox drivers. - Wire protocol (esp32_bridge_protocol.h) shared with the firmware: COBS frames with CRC-16, layout transactions, input and output reports, keepalive. The bridge re-enumerates on every layout change; the client reopens the port, restores the desired layout after resets, and replays the latest gamepad report. - platform_default switches to an attached bridge (USB serial LVHB-*), LVH_ESP32_PORT, or LVH_BACKEND=esp32_bridge unless Esp32BridgeOptions::autodetect is false; gamepads fall back to the platform backend when an implicitly selected bridge does not answer. - Pairing: the bridge accepts layout and input frames only from hosts that answer an HMAC-SHA256 challenge with a secret it issued after a press of its BOOT button. Secrets are stored per bridge in a file only its owner (and SYSTEM/Administrators on Windows) can read. POSIX ports are opened with TIOCEXCL. - lvh::find_esp32_bridge_ports() and lvh::esp32_bridge_status() report attached bridges and the connection and pairing state without opening a port. - Build lizardbyte-common's env helper on every platform.
Use small structs for the key usage tables instead of std::pair built from int literals (MSVC C4244), and a string_view for the auth context instead of pointer arithmetic on a literal (-Wstring-plus-int).
Build the fixed-size auth message and AUTH payload as arrays and the keyboard/mouse descriptor with a sized vector instead of repeated vector::insert calls.
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Superseded by LizardByte#201. |
- Replace the C protocol header with a C++ one (constexpr constants, std::span, std::optional frame decoding); the firmware keeps a C copy. - Group BridgeClient state into per-mutex structs and move the frame handlers onto the connection state. - Split frame accumulation out of the reader loop. - Use std::byte for bit manipulation, std::format for messages, and std::array instead of C arrays. - Split the fake firmware's frame handler in the tests and create test directories below the working directory.
A layout change waited for a session that reported the new generation. If the bridge reset again before the waiting thread woke up, the wait ran into the re-enumeration timeout while holding the layout lock, which also delayed restoring the layout after the reset. Record the last generation a usable session reported and wait for that instead.
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Fork-internal draft to run CI before the upstream pull request.