# -*- coding: utf-8 -*-
# Copyright (C) 2015-2019 Peter Magnusson <peter@kmpm.se>
from platform import system
from os import environ
from serial.tools import list_ports
def default_port(sysname=system(), detect=True):
"""This returns the default port used for different systems if SERIALPORT env variable is not set"""
system_default = {
'Windows': 'COM1',
'Darwin': '/dev/tty.SLAB_USBtoUART'
}.get(sysname, '/dev/ttyUSB0')
# if SERIALPORT is set then don't even waste time detecting ports
if 'SERIALPORT' not in environ and detect:
try:
ports = list_ports.comports(include_links=False)
if len(ports) == 1:
return ports[0].device
else:
# clever guessing, sort of
# vid/pid
# 4292/60000 adafruit huzzah
for p in ports:
if p.vid == 4292 and p.pid == 60000:
return p.device
# use last port as fallback
return ports[-1].device
except Exception:
pass
return environ.get('SERIALPORT', system_default)
