LPFKBasic.js

import { SerialPort } from 'serialport'

/** ==== CONFIG ==== */
const PORT_PATH = '/dev/tty.usbserial-BG00L04S' // ← change to your device if needed
const BAUD_RATE = 9600

/** ==== OPEN PORT ==== */
const port = new SerialPort({
  path: PORT_PATH,
  baudRate: BAUD_RATE,
  dataBits: 8,
  stopBits: 1,
  parity: 'odd',
})

/** ==== LED STATE (mirrors 0x94 b0 b1 b2 b3) ==== */
let ledB0 = 0x00,
  ledB1 = 0x00,
  ledB2 = 0x00,
  ledB3 = 0x00

function send(bytes) {
  const buf = Buffer.from(bytes)
  port.write(buf, (err) => {
    if (err) console.error('write error:', err.message)
  })
}

function pushLeds() {
  send([0x94, ledB0, ledB1, ledB2, ledB3])
}

export function clearLeds() {
  ledB0 = ledB1 = ledB2 = ledB3 = 0x00
  pushLeds()
}

export function setLedBit(k, on = true) {
  if (k < 0x00 || k > 0x1f) return
  const grp = k >> 3 // 0..3
  const col = k & 7 // 0..7
  const bit = 7 - col // left→right
  const mask = 1 << bit
  if (grp === 0) ledB0 = on ? ledB0 | mask : ledB0 & ~mask
  else if (grp === 1) ledB1 = on ? ledB1 | mask : ledB1 & ~mask
  else if (grp === 2) ledB2 = on ? ledB2 | mask : ledB2 & ~mask
  else if (grp === 3) ledB3 = on ? ledB3 | mask : ledB3 & ~mask
  pushLeds()
}

export function toggleLedBit(k) {
  if (k < 0x00 || k > 0x1f) return
  const grp = k >> 3,
    col = k & 7,
    bit = 7 - col,
    mask = 1 << bit
  if (grp === 0) ledB0 ^= mask
  else if (grp === 1) ledB1 ^= mask
  else if (grp === 2) ledB2 ^= mask
  else if (grp === 3) ledB3 ^= mask
  pushLeds()
}

/** ==== LPFK INIT ==== */
function init() {
  send([0x01]) // Reset
  setTimeout(() => send([0x08]), 1000) // Enable
}

/** ==== SERIAL EVENTS ==== */
port.on('open', () => {
  console.log('LPFK connected on', PORT_PATH)
  init()
})

port.on('data', (buf) => {
  for (const byte of buf) {
    if (byte <= 0x1f) {
      console.log(`Key code: 0x${byte.toString(16).padStart(2, '0')}`)

      if (byte === 0x1c) {
        // 特殊动画：左上 → 右下 顺序点亮
        runSweepAnimation()
      } else {
        // 普通键：toggle 对应 LED
        toggleLedBit(byte)
      }
    } else if (byte === 0x81) {
      // ACK
    } else if (byte === 0x80) {
      console.warn('Retransmit requested (0x80)')
    }
  }
})

function runSweepAnimation() {
  clearLeds()
  const delay = 80 // 每步延迟 ms
  for (let k = 0; k < 32; k++) {
    setTimeout(() => {
      setLedBit(k, true)
    }, k * delay)
  }
  // 结束后清空
  setTimeout(() => {
    clearLeds()
  }, 32 * delay + 500)
}

port.on('error', (err) => {
  console.error('SerialPort error:', err.message)
})

/** ==== OPTIONAL: simple CLI helpers ==== */
// Press Ctrl+C to turn all LEDs off before exit.
function gracefulExit() {
  try {
    clearLeds()
  } finally {
    process.exit(0)
  }
}
process.on('SIGINT', gracefulExit)
process.on('SIGTERM', gracefulExit)

// Export a few helpers for REPL usage if you `node -i -e "import('./lpfk.js')"`
export function enable() {
  send([0x08])
}
export function disable() {
  send([0x09])
}
export function reset() {
  send([0x01])
}
export function readCfg() {
  send([0x06])
}
export function setBitmap(b0, b1, b2, b3) {
  ledB0 = b0 & 0xff
  ledB1 = b1 & 0xff
  ledB2 = b2 & 0xff
  ledB3 = b3 & 0xff
  pushLeds()
}