# Pastebin HOL6v68f
#!/usr/bin/python
import serial
import Tkinter

SERIAL = "/dev/ttyVIZ0"
EXPECT = "HDMI2USB>"
INIT = """
output0 on
output1 off
video_mode 10
encoder on
encoder quality 85
"""

CAMERA = """
video_matrix connect input0 output0
video_matrix connect input0 encoder
output1 off
"""

SLIDES = """
video_matrix connect input1 output0
video_matrix connect input1 encoder
output1 off
"""

def initHDMI2USB():
    ser = serial.Serial(SERIAL, 115200, timeout=3)
    if not ser.isOpen():
        print "Could not open %s" % (SERIAL)
        exit
    print "Initialising %s" % (SERIAL)
    ser.write(INIT)
    return ser

def keyHandler(event):
    if (event.char == 'q'):
        root.quit()
    elif event.char == '1':
        print CAMERA
        ser.write(CAMERA)
    elif event.char == '2':
        print SLIDES
        ser.write(SLIDES)

ser = initHDMI2USB()

#make a TkInter Window
root = Tkinter.Tk()
root.geometry('400x200+100+100')
root.wm_title("HDMI2USB Serial Control")

# Create a label with instructions
label = Tkinter.Label(root, width=400, height=300, text='Press 1 for camera, 2 for slides, or q to quit')
label.pack(fill=Tkinter.BOTH, expand=1)
label.bind('<Key>', keyHandler)
label.focus_set()

root.mainloop()

print "Closing serial port"
ser.close()