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commands.md

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Commands

The input modules can be controlled by sending commands via the USB CDC-ACM serial port. To send a command, write the two magic bytes, command ID and parameters. Most commands don't return anything.

Simple example in Python:

import serial

def send_command(command_id, parameters, with_response=False):
  with serial.Serial("/dev/ttyACM0", 115200) as s:
      s.write([0x32, 0xAC, command_id] + parameters)

      if with_response:
          res = s.read(32)
          return res

# Go to sleep and check the status
send_command(0x03, [True])
res = send_command(0x03, [], with_response=True)
print(f"Is currently sleeping: {bool(res[0])}")

Many commands support setting and writing a value, with the same command ID. When no parameters are given, the current value is queried and returned.

Modules:
  • L = LED Matrix
  • D = B1 Display
  • M = C1 Minimal Module

Command overview

Command ID Modules Response Parameters Behavior
Brightness 0x00 L M Set LED brightness
Pattern 0x01 L Display a pattern
Bootloader 0x02 LDM Jump to the bootloader
Sleep 0x03 LDM bool Go to sleep or wake up
GetSleep 0x03 LDM bool Check sleep state
Animate 0x04 L bool Scroll current pattern
GetAnimate 0x04 L bool Check whether animating
Panic 0x05 LDM Cause a FW panic/crash
DrawBW 0x06 L 39 Bytes Draw a black/white image
StageCol 0x07 L 1+34 Bytes Send a greyscale column
FlushCols 0x08 L Flush/draw all columns
SetText 0x09 D TODO: Remove
StartGame 0x10 L 1B Game ID Start an embeded game
GameCtrl 0x11 L 1B Control Send a game command
GameStatus 0x12 L WIP Check the game status
SetColor 0x13 M 3B: RGB Set the LED's color
DisplayOn 0x14 D bool Turn the display on/off
InvertScreen 0x15 D bool Invert scren on/off
SetPxCol 0x16 D 50 Bytes Send a column of pixels
FlushFB 0x17 D Flush all columns
Version 0x20 D 3 Bytes Get firmware version

Pattern (0x01)

The following patterns are defined

  • 0x00 - Percentage (See below, needs another parameter)
  • 0x01 - Gradient (Brightness gradient from top to bottom)
  • 0x02 - DoubleGradient (Brightness gradient from the middle to top and bottom)
  • 0x03 - DisplayLotusHorizontal (Display "LOTUS" 90 degree rotated)
  • 0x04 - ZigZag (Display a zigzag pattern)
  • 0x05 - FullBrightness (Turn every LED on and set the brightness to 100%)
  • 0x06 - DisplayPanic (Display the string "PANIC")
  • 0x07 - DisplayLotusVertical (Display the string "LOTUS")

Pattern 0x00 is special. It needs another parameter to specify the percentage. It will fill a percentage of the screen. It can serve as a progress indicator.

DrawBW (0x06)

TODO

StageCol (0x07)

TODO

FlushCols (0x08)

TODO

SetPxCol (0x16)

TODO

FlushFB (0x17)

TODO

Version (0x20)

Response:

Byte 0: USB bcdDevice MSB
Byte 1: USB bcdDevice LSB
Byte 2: 1 if pre-release version, 0 otherwise