CydandClaude Fable 5
d26000f906
vRIO wrote whole reply packets in one SerialPort.Write; through a com0com null-modem (no UART) the host saw the bytes ~30-40 us apart, a burst no real board can produce and the prime suspect in a rocky game init. Replies now leave one byte per 10-bit frame (~1.04 ms), so the 45-byte CheckRequest response takes ~47 ms like real hardware (measured 0.94-1.10 ms gaps over a com0com pair). - Transmit frames queue to a writer thread; each byte is scheduled against a monotonic slot deadline slot = max(prev + period, now), so the stream averages true 9600 baud without bursting after idle. - After a write the schedule is floored at the actual emission time: a late wake-up can never be followed by a catch-up burst - two frames closer than the frame time is structurally impossible. - 1 ms system timer resolution while the port is open (timeBeginPeriod) so the pacer sleeps most of each gap and only spins the last ~1.8 ms. - Side benefit: UI clicks no longer block on SerialPort.Write (a stalled port could previously hang the UI for the 2 s write timeout). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
98 lines
4.7 KiB
Markdown
98 lines
4.7 KiB
Markdown
# vRIO — virtual RIO cockpit device
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A software replica of the cockpit **RIO** (Remote Input/Output) board: it opens
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a COM port and speaks the **device side** of the RIO serial protocol, so any
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host that expects the real hardware — most importantly
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[RIOJoy](../riojoy/) — can talk to it without a cockpit attached.
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The window is an interactive version of the cockpit control panel that
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RIOJoy's profile editor draws (the same functional layout from the original
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Win32 RIO design: five MFD clusters, four board columns, two keypads, encoder
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gauges). But where the editor *edits bindings*, vRIO's cells are the physical
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controls:
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- **Left-click** a cell — momentary button press (`ButtonPressed`/`Released`
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or `KeyPressed`/`Released` on the wire). **Right-click** — latch it down.
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- **Drag** the X/Y box and the Z / L / R gauges — the five analog axes,
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returned by the next `AnalogReply` (14-bit signed, 7-bit-pair packed).
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Gauges span each axis' realistic hardware travel, not the full 14-bit
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range: Z/L/R rest at raw 0 at the gauge bottom and travel to −800
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(throttle — forward travel runs negative, matching RIOJoy's ratchet) or
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+500 (spring-loaded pedals), and the stick covers ±80 around center —
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the windows RIOJoy's calibrator expects.
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- Cells shade to the **lamp state the host commands** (`LampRequest`:
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off / dim / bright, with slow/med/fast flash), so RIOJoy's press-feedback
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lights the on-screen panel just like the real buttons.
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- **Keyboard and Xbox (XInput) controller input** drive the same controls
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through a bindings file (`%APPDATA%\vRIO\bindings.txt`, created with
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commented defaults on first run — *Edit bindings…* opens it, *Reload
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bindings* applies edits live). Keys and pad buttons press any RIO address;
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pad sticks/triggers and keys drive the axes in each axis' realistic travel
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window, with deflect (spring-back), rate (throttle-style, position holds),
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deadzone, and invert options. Defaults: arrows = stick, W/S = throttle,
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Q/E = pedals, numpad = internal keypad, IJKL/Space = hat + main, left
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stick / triggers / right stick = stick / pedals / throttle on the pad.
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## Wire behavior
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Protocol per `riojoy/docs/PROTOCOL.md` (9600 8N1, `[cmd][payload…][7-bit
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checksum]`, ACK `0xFC` / NAK `0xFD` / RESTART `0xFE` / IDLE `0xFF`), with
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device behavior grounded in the **real v4.2 firmware dump**
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(`riojoy/rio-firmware/RIOv4_2-ANALYSIS.md`):
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- ACKs every well-formed packet; NAKs bad-checksum packets.
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- **TX is paced at the wire rate** — one byte per 10-bit frame (~1.04 ms at
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9600 8N1), never closer. A virtual null-modem has no UART, so unpaced
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writes would land at the host in microsecond bursts no real board could
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produce; vRIO's writer thread schedules each byte against a monotonic
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slot deadline instead, so e.g. the 45-byte CheckRequest response takes
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the same ~47 ms it takes real hardware.
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- `CheckRequest` → one `BoardOk` CheckReply per board (the 11 boards from the
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legacy firmware's table). `VersionRequest` → configurable version,
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default **4.2**.
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- `ResetRequest` re-zeroes the targeted axis (or all).
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- A NAK re-sends the last event up to **4 times**, then gives up with a
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RESTART byte — the real board's retry budget.
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- Optional **v4.2 reply-wedge emulation**: after retry exhaustion (or the
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"Wedge analog now" button), analog requests are silently dropped — still
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ACK'd, RX path alive — until a host `ResetRequest`, reproducing the
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latch-leak fault the firmware analysis documents. Use it to exercise
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RIOJoy's 5-second no-analog recovery watchdog.
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## Using it with RIOJoy on one PC
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The two apps need a crossed serial link. Install a
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[com0com](https://com0com.sourceforge.net/) virtual null-modem pair
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(e.g. `COM5 ⇄ COM6`), then:
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1. Run `VRio.App`, pick `COM5`, **Open**.
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2. Point RIOJoy at `COM6`.
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RIOJoy's DTR open-pulse shows up in the wire log (DSR handshake), its ~55 ms
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analog polling drives the "analog polls served" counter, and every click on
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the vRIO panel arrives at RIOJoy as real cockpit input. Two physical PCs with
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a null-modem cable work the same way.
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## Repository layout
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| Path | Contents |
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|------|----------|
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| `src/VRio.Core` | Protocol framing/builder/parser, the `VRioDevice` state machine, serial pump, panel layout data (class library) |
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| `src/VRio.App` | WinForms panel UI |
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| `tests/VRio.Core.Tests` | xUnit tests for the protocol + device engine |
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## Building
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Same toolchain as RIOJoy: **.NET SDK** (8.0+) with the **.NET Framework 4.8**
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targeting pack; apps target net48 so deployed builds run in-box on
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Windows 10/11.
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```sh
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dotnet build VRio.sln -c Release
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dotnet test VRio.sln
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```
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Interop is additionally verified against RIOJoy's real `RioSerialLink`
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(version/check/analog/lamp/button/keypad/reset round-trips over an in-memory
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transport) — see the RIOJoy repo for the host side.
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