dmx-flok/drivers/enttec-usb-dmx-pro.js

var FTDI = require('ftdi')

var	  ENTTEC_PRO_DMX_STARTCODE = 0x00
	, ENTTEC_PRO_START_OF_MSG  = 0x7e
	, ENTTEC_PRO_END_OF_MSG    = 0xe7
	, ENTTEC_PRO_SEND_DMX_RQ   = 0x06
	, ENTTEC_PRO_RECV_DMX_PKT  = 0x05
	;


exports.init = function(dev_id) {
	var send_universe = function(dev, universe) {
		var hdr = Buffer([
			ENTTEC_PRO_START_OF_MSG,
			ENTTEC_PRO_SEND_DMX_RQ,
			(universe.length + 1) & 0xff,
			((universe.length + 1) >> 8) & 0xff,
			ENTTEC_PRO_DMX_STARTCODE
			])

		var msg = 	Buffer.concat([
				hdr,
				universe,
				Buffer([ENTTEC_PRO_END_OF_MSG])
				])
		dev.write(msg)
	}
	
	var universe = new Buffer(512)
	universe.fill(0)
	
	var dev = new FTDI.FtdiDevice(dev_id)
	dev.open({
		'baudrate': 250000,
		'databits': 8,
		'stopbits': 2,
		'parity': 'none'
	}, function(err) {
		console.log(err)
	})

	this.update = function(u) {
		for(var k in u) {
			universe[k] = u[k]
		}
	}
	
	this.get = function(c) {
		return universe[c]
	}
	
	setInterval(function() {
		send_universe(dev, universe);
	}, 25)
	
	return this;
}