upm/examples/python/ds2413.py

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#!/usr/bin/python
# Author: Jon Trulson <jtrulson@ics.com>
# Copyright (c) 2015 Intel Corporation.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
from __future__ import print_function
import time, sys, signal, atexit
from upm import pyupm_ds2413 as sensorObj
def main():
# Instantiate a DS2413 Module on a Dallas 1-wire bus connected to UART 0
sensor = sensorObj.DS2413(0)
## Exit handlers ##
# This stops python from printing a stacktrace when you hit control-C
def SIGINTHandler(signum, frame):
raise SystemExit
# This function lets you run code on exit
def exitHandler():
print("Exiting...")
sys.exit(0)
# Register exit handlers
atexit.register(exitHandler)
signal.signal(signal.SIGINT, SIGINTHandler)
# find all of the DS2413 devices present on the bus
sensor.init();
# how many devices were found?
print("Found", sensor.devicesFound(), "device(s)")
# read the gpio and latch values from the first device
# the lower 4 bits are of the form:
# <gpioB latch> <gpioB value> <gpioA latch> <gpioA value>
print("GPIO device 0 values:", sensor.readGpios(0))
# set the gpio latch values of the first device
print("Setting GPIO latches to on")
sensor.writeGpios(0, 0x03);
if __name__ == '__main__':
main()