index.js

import argv from 'minimist'
import keypress from 'keypress'
import RadioCar from './src/RadioCar.js'

let drive, timer

argv(process.argv.slice(2))

if (argv.h || argv.help) help()
else if (argv.v || argv.version) version()
else run()

function run () {
  console.info('Connecting to device...')

  drive = new RadioCar({
    channel: argv.c || argv.channel,
    freq: argv.f || argv.freq,
    speed: argv.speed,
    swaplr: argv.swaplr,
    id: argv.d || argv.id,
    gain: argv.gain,
    sampleRate: argv['sample-rate']
  })

  drive.init().then(() => {
    console.info('Found device!')
    console.info('Use keys to drive - Run with --help for details')

    keypress(process.stdin)

    process.stdin.on('keypress', (ch, key) => {
      if (!key) return
      if (key && key.ctrl && key.name === 'c') return exit()

      clearTimeout(timer)

      switch (key.name) {
        case 'w': drive.forward(); break
        case 'q': drive.forwardLeft(); break
        case 'e': drive.forwardRight(); break
        case 's': drive.reverse(); break
        case 'a': drive.reverseLeft(); break
        case 'd': drive.reverseRight(); break
        case 'z': drive.left(); break
        case 'c': drive.right(); break
        case 'u': return drive.turn180(stop) // 180 stops automatically
      }

      timer = setTimeout(stop, 150)

      function stop () {
        drive.stop()
      }
    })
    process.stdin.setRawMode(true)
    process.stdin.resume()
  }).catch((error) => console.error(error))
}

function help () {
  console.info(`
Usage:
  monster-drift [options]
Options:
  -h, --help       Show this message
  -v, --version    Show version
  -c, --channel=N  Set transmit channel (default: 19)
  --freq=Hz        Set transmit frequency (overwrites --channel)
  --speed=N        Set default forward speed (1-3, default: 1)
  --swaplr         Invert left/right stearing
  -d, --id         HackRF device id (default: 0)
  --gain           HackRF TX gain (0-47 dB in 1 dB steps, default: 47)
  --sample-rate    Sample rate used when transmitting (default: 8e6)
Use the keyboard to drive.
Basic driving:
  w: Forward
  q: Forward/Right
  e: Forward/Left
  s: Reverse
  a: Reverse/Right
  d: Reverse/Left
  z: Wheels Left
  c: Wheels Right
Tricks:
  u: Turn 180
Exit by pressing ctrl+c
P.S. A high key-repeat will improve the experience :)
  `)
}

function exit () {
  drive.close(() => process.exit())
}