test.js

var serialport = require("serialport")
var color = require("colors")
var EventEmitter = require('events').EventEmitter;
var util = require('util');
var q = require('q');
var fs = require('fs');
const commandLineArgs = require("command-line-args");







/*

on("read") can then call needsWrite(), and needsWrite(), and on('written') can call read()
read(), later on('readDone') calls write(), later on('writeDone') calls read()
eventually write() calls promise.fulfill()
you don't *need* promises. events are good for what events do.


promise to open port
promise to flash board
use events (functions) inside of the flash_board

*/









const optionDefinitions = [
  { name: 'port', alias:"p",
    file: 'file', alias: "f"}
  //{ name: 'src', type: String, multiple: true, defaultOption: true },
  //{ name: 'timeout', alias: 't', type: Number }
]

const options = commandLineArgs(optionDefinitions);

var atmel_bootloader_Options = {
    baudRate: 1200,
    flowcontrol: ['RTSCTS'],
    // Provide our own custom parser:
    timedSendsOnly: false
  };

  var atmel_flashing_Options = {
    baudRate: 115200,
    flowcontrol: ['RTSCTS'],
    // Provide our own custom parser:
    timedSendsOnly: false
  };


// var PORT = "/dev/cu.usbmodem14221"
var PORT = options.port;
if(PORT == true) //dumb hack needed for vsc
    PORT = '/dev/cu.usbmodem142111';

var enterBootloaderMode = function(){
    return q.Promise(function(resolve, reject, notify){
        var _p = new serialport(PORT, atmel_bootloader_Options)
        _p.on('open',function(){
            //Close when we open to kick board into bootloader
            console.log("1200 baud Port Opened");
            _p.close();
        })

        _p.on('close', function(){
            console.log("Closed 1200 baud");
            resolve();
        })
    })
}

var getPort = function(){
    return q.Promise(function(resolve, reject, notify){
        var sProm = enterBootloaderMode().then(function(){
            var s = new serialport(PORT, atmel_flashing_Options)
            s.on('open', function(s){
                console.log("Port Opened");
                resolve(this);
            }); //end s.on()
        }); //then end
    }); //end promise
}

var startFlash = function(port){
    var self = this;
    var _w = function(msg, data){
        console.log("[W] " + msg + " " + data);
        this.write(data);
    }

    console.log("Starting to flash board @ " + port.path);
    _w("Set board to binary ", "%N");
}

var s  = getPort()

s.then(function(val){
    startFlash(val)
});