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demo.py
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Thu, Feb 20, 13:51

demo.py
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#!/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_anbutton import *
def functionValueChangeCallback(fct, value):
info = fct.get_userData()
print(info['hwId'] + ": " + value + " " + info['unit'] + " (new value)")
def sensorTimedReportCallback(fct, measure):
info = fct.get_userData()
print(info['hwId'] + ": " + str(measure.get_averageValue()) + " " + info['unit'] + " (timed report)")
def deviceArrival(m):
serial = m.get_serialNumber()
print('Device arrival : ' + serial)
# First solution: look for a specific type of function (eg. anButton)
fctcount = m.functionCount()
for i in range(fctcount):
hardwareId = serial + '.' + m.functionId(i)
if hardwareId.find('.anButton') >= 0:
print('- ' + hardwareId)
bt = YAnButton.FindAnButton(hardwareId)
bt.set_userData({'hwId': hardwareId, 'unit': ''})
bt.registerValueCallback(functionValueChangeCallback)
# Alternate solution: register any kind of sensor on the device
sensor = YSensor.FirstSensor()
while sensor:
if sensor.get_module().get_serialNumber() == serial:
hardwareId = sensor.get_hardwareId()
print('- ' + hardwareId)
sensor.set_userData({'hwId': hardwareId, 'unit': sensor.get_unit()})
sensor.registerValueCallback(functionValueChangeCallback)
sensor.registerTimedReportCallback(sensorTimedReportCallback)
sensor = sensor.nextSensor()
def deviceRemoval(m):
print('Device removal : ' + m.get_serialNumber())
errmsg = YRefParam()
# No exception please
YAPI.DisableExceptions()
# Setup the API to use local USB devices
if YAPI.RegisterHub("usb", errmsg) != YAPI.SUCCESS:
sys.exit("init error" + errmsg.value)
YAPI.RegisterDeviceArrivalCallback(deviceArrival)
YAPI.RegisterDeviceRemovalCallback(deviceRemoval)
print('Hit Ctrl-C to Stop ')
while True:
YAPI.UpdateDeviceList(errmsg) # traps plug/unplug events
YAPI.Sleep(500, errmsg) # traps others events

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