#!/usr/bin/python
# -*- coding: utf-8 -*-
import os,sys
# add ../../Sources to the PYTHONPATH
sys.path.append(os.path.join("..","..","Sources"))
from yocto_api import *
from yocto_power import *

def usage():
    scriptname = os.path.basename(sys.argv[0])
    print("Usage:")
    print(scriptname+' <serial_number>')
    print(scriptname+' <logical_name>')
    print(scriptname+' any  ')
    sys.exit()

def die(msg):
    sys.exit(msg+' (check USB cable)')

errmsg=YRefParam()

if len(sys.argv)<2 :  usage()

target=sys.argv[1]

# Setup the API to use local USB devices
if YAPI.RegisterHub("usb", errmsg)!= YAPI.SUCCESS:
    sys.exit("init error"+errmsg.value)

if target=='any':
    # retreive any Power sensor
    sensor = YPower.FirstPower()
    if sensor is None :
        die('No module connected')
else:
    sensor= YPower.FindPower(target + '.power')


while True:
    if not(sensor.isOnline()):die('device not connected')
    print("Power :  "+ "%2.1f" % sensor.get_currentValue() + "W (Ctrl-C to stop)")
    YAPI.Sleep(1000)
