import _winreg as winreg
import itertools

DEVICE_NAME = "\\Device\\thcdcacm0"
TERA_TERM = "C:\\Program Files (x86)\\teraterm\\ttermpro.exe"

# Copied from http://stackoverflow.com/questions/1205383/listing-serial-com-ports-on-windows
def enumerate_serial_ports():
    """
	Uses the Win32 registry to return a iterator of serial
    (COM) ports existing on this computer.
    """
    path = 'HARDWARE\\DEVICEMAP\\SERIALCOMM'
    try:
        key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, path)
    except WindowsError:
        raise IterationError

    for i in itertools.count():
        try:
            val = winreg.EnumValue(key, i)
            yield (str(val[1]), str(val[0]))
        except EnvironmentError:
            break


def mbed_comm_port():		
	for comm in enumerate_serial_ports():
		if comm[1] == DEVICE_NAME:
			return comm[0]


if __name__ == "__main__":
	comm = mbed_comm_port()
	if comm:
		port = int(comm[3:])
		import subprocess
		subprocess.call([TERA_TERM, '/C=%d' % port, '/BAUD=9600'])