from __future__ import division

import usb.core

from usb.util import CTRL_TYPE_VENDOR, CTRL_RECIPIENT_DEVICE, CTRL_OUT

"""

Send dmx to one of these:

http://www.amazon.com/Interface-Adapter-Controller-Lighting-Freestyler/dp/B00W52VIOS

[4520784.059479] usb 1-2.3: new low-speed USB device number 6 using xhci_hcd

[4520784.157410] usb 1-2.3: New USB device found, idVendor=16c0, idProduct=05dc

[4520784.157416] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3

[4520784.157419] usb 1-2.3: Product: uDMX

[4520784.157422] usb 1-2.3: Manufacturer: www.anyma.ch

[4520784.157424] usb 1-2.3: SerialNumber: ilLUTZminator001

See https://www.illutzmination.de/udmxfirmware.html?&L=1

    sources/commandline/uDMX.c

or https://github.com/markusb/uDMX-linux/blob/master/uDMX.c

"""

cmd_SetChannelRange = 0x0002

class Udmx(object):

    def __init__(self):

        self.dev = usb.core.find(idVendor=0x16c0, idProduct=0x05dc)

    def SendDMX(self, buf):

        ret = self.dev.ctrl_transfer(

           bmRequestType=CTRL_TYPE_VENDOR | CTRL_RECIPIENT_DEVICE | CTRL_OUT,

           bRequest=cmd_SetChannelRange,

           wValue=len(buf),

           wIndex=0,

           data_or_wLength=buf)

        if ret < 0:

            raise ValueError("ctrl_transfer returned %r" % ret)

def demo(chan, fps=44):

    import time, math

    u = Udmx()

    while True:

        nsin = math.sin(time.time() * 6.28) / 2.0 + 0.5

        nsin8 = int(255 * nsin)

        try:

            u.SendDMX('\x00' * (chan - 1) +

                      chr(210) +

                      chr(nsin8) + chr(nsin8) + chr(nsin8))

        except usb.core.USBError as e:

            print "err", time.time(), repr(e)

        time.sleep(1 / fps)

pyusb==1.0.0