uci-i2c-device/lib/bus.js

'use strict'

const i2c = require('i2c-bus'),
  pA = require('bluebird').promisifyAll,
  pQ = require('promisqueue')

const pify = require('pify')

// TODO Create a Bus master class then BusRPi classes etc for actual hardware.

class Bus {

  constructor(busnum = 1) {
    this.busnum = busnum
    this.q = new pQ({ limit: 1 })
    this.qAdd = (pjob) => { this.q.add(() => pjob) }
    this.bus = i2c.open(this.busnum, () => {})
  }

  // init() {
  //   const bus = pA(i2c.open(this.busnum, () => {}), { suffix: "_p" }) //,multiArgs: true})
  //
  // }

  scan() { return pify(this.bus.scan).bind(this.bus)() }
  close() { return pify(this.bus.close).bind(this.bus)() }

  readRaw(address, length, buffer) {
    return pify(this.bus.i2cRead).bind(this.bus)(address, length, buffer)
  }

  writeRaw(address, length, buffer) {
    return pify(this.bus.i2cWrite).bind(this.bus)(address, length, buffer)
  }

  read(address, cmd) {
    return pify(this.bus.readByte).bind(this.bus)(address, cmd)
  }

  write(address, cmd, byte) {
    return pify(this.bus.writeByte.bind(this.bus))(address, cmd, byte)
  }

  read2(address, cmd) {
    return pify(this.bus.readWord.bind(this.bus))(address, cmd)
  }

  write2(address, cmd, bytes) {
    return pify(this.bus.writeWord.bind(this.bus))(address, cmd, bytes)
  }

} // end of Bus Class

module.exports = {
  Bus
};