def GoodFETSerialPort(**kwargs):
"Return a Serial port using default values possibly overriden by caller"
import serial
port = os.environ.get('GOODFET') or "/dev/ttyUSB0"
args = dict(port=port, baudrate=115200,
parity=serial.PARITY_NONE, timeout=2)
args.update(kwargs)
return serial.Serial(**args)
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