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80 lines
3.2 KiB
Markdown
80 lines
3.2 KiB
Markdown
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Fadecandy: Open Pixel Control Protocol
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======================================
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The Fadecandy Server (`fcserver`) operates as a bridge between LED controllers attached over USB, and visual effects that communicate via a TCP socket.
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The primary protocol supported by `fcserver` is [Open Pixel Control](http://openpixelcontrol.org), a super simple way to send RGB values over a socket. We support the standard Open Pixel Control commands, as well as some Fadecandy extensions.
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Socket
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------
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Open Pixel Control uses a TCP socket, by default on port 7890. For the best performance, remember to set TCP_NODELAY socket option.
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Command Format
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--------------
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All OPC commands follow the same general format. All multi-byte values in Open Pixel Control are in network byte order, high byte followed by low byte.
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Channel | Command | Length (N) | Data
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---------- | --------- | ---------- | --------------------------
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1 byte | 1 byte | 2 bytes | N bytes of message data
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Set Pixel Colors
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----------------
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Video data arrives in a **Set Pixel Colors** command:
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Byte | **Set Pixel Colors** command
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------ | --------------------------------
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0 | Channel Number
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1 | Command (0x00)
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2 - 3 | Data length
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4 | Pixel #0, Red
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5 | Pixel #0, Green
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6 | Pixel #0, Blue
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7 | Pixel #1, Red
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8 | Pixel #1, Green
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9 | Pixel #1, Blue
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… | …
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As soon as a complete Set Pixel Colors command is received, a new frame of video will be broadcast simultaneously to all attached Fadecandy devices.
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Set Global Color Correction
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---------------------------
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The color correction data (from the 'color' configuration key) can also be changed at runtime, by sending a new blob of JSON text in a Fadecandy-specific command. Fadecandy's 16-bit System ID for Open Pixel Control's System Exclusive (0xFF) command is **0x0001**.
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Byte | **Set Global Color Correction** command
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------ | ------------------------------------------
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0 | Channel Number (0x00, reserved)
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1 | Command (0xFF, System Exclusive)
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2 - 3 | Data length (JSON Length + 4)
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4 - 5 | System ID (0x0001, Fadecandy)
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6 - 7 | SysEx ID (0x0001, Set Global Color Correction)
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8 - … | JSON Text
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Set Firmware Configuration
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--------------------------
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The firmware supports some runtime configuration options. Any OPC client can send a new firmware configuration packet using this command. If the supplied data is shorter than the firmware's configuration buffer, only the provided bytes will be changed.
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Byte | **Set Firmware Configuration** command
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------ | ------------------------------------------
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0 | Channel Number (0x00, reserved)
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1 | Command (0xFF, System Exclusive)
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2 - 3 | Data length (Configuration Length + 4)
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4 - 5 | System ID (0x0001, Fadecandy)
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6 - 7 | SysEx ID (0x0002, Set Firmware Configuration)
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8 - … | Configuration Data
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Current firmwares support the following configuration options:
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Byte Offset | Bits | Description
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----------- | ------ | ------------
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0 | 7 … 4 | (reserved)
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0 | 3 | Manual LED control bit
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0 | 2 | 0 = LED shows USB activity, 1 = LED under manual control
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0 | 1 | Disable keyframe interpolation
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0 | 0 | Disable dithering
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1 … 62 | 7 … 0 | (reserved)
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