83 lines
2.2 KiB
Python
83 lines
2.2 KiB
Python
import serial, sys
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START_VAL = 0x7E
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END_VAL = 0xE7
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COM_BAUD = 57600
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COM_TIMEOUT = 1
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COM_PORT = 7
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DMX_SIZE = 512
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LABELS = {
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'GET_WIDGET_PARAMETERS' :3, #unused
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'SET_WIDGET_PARAMETERS' :4, #unused
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'RX_DMX_PACKET' :5, #unused
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'TX_DMX_PACKET' :6,
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'TX_RDM_PACKET_REQUEST' :7, #unused
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'RX_DMX_ON_CHANGE' :8, #unused
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}
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class DMXConnection(object):
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def __init__(self, comport = None):
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'''
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On Windows, the only argument is the port number. On *nix, it's the path to the serial device.
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For example:
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DMXConnection(4) # Windows
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DMXConnection('/dev/tty2') # Linux
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DMXConnection("/dev/ttyUSB0") # Linux
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'''
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self.dmx_frame = [0] * DMX_SIZE
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try:
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self.com = serial.Serial(comport, baudrate = COM_BAUD, timeout = COM_TIMEOUT)
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except:
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com_name = 'COM%s' % (comport + 1) if type(comport) == int else comport
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print("Could not open device %s. Quitting application." % com_name)
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sys.exit(0)
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print("Opened %s." % (self.com.portstr))
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def setChannel(self, chan, val, autorender = False):
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'''
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Takes channel and value arguments to set a channel level in the local
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DMX frame, to be rendered the next time the render() method is called.
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'''
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if not 1 <= chan-1 <= DMX_SIZE:
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print('Invalid channel specified: %s' % chan-1)
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return
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# clamp value
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val = max(0, min(val, 255))
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self.dmx_frame[chan-1] = val
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if autorender: self.render()
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def clear(self, chan = 0):
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'''
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Clears all channels to zero. blackout.
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With optional channel argument, clears only one channel.
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'''
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if chan == 0:
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self.dmx_frame = [0] * DMX_SIZE
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else:
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self.dmx_frame[chan-1] = 0
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def render(self):
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''''
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Updates the DMX output from the USB DMX Pro with the values from self.dmx_frame.
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'''
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packet = [
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START_VAL,
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LABELS['TX_DMX_PACKET'],
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len(self.dmx_frame) & 0xFF,
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(len(self.dmx_frame) >> 8) & 0xFF,
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]
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packet += self.dmx_frame
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packet.append(END_VAL)
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packet = list(map(chr, packet))
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self.com.write(''.join(packet))
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def close(self):
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self.com.close()
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