upm/examples/python/mma7660.py

#!/usr/bin/env python
# Author: Zion Orent <zorent@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_mma7660 as upmMMA7660

def main():
    # Instantiate an MMA7660 on I2C bus 0
    myDigitalAccelerometer = upmMMA7660.MMA7660(
                                            upmMMA7660.MMA7660_DEFAULT_I2C_BUS,
                                            upmMMA7660.MMA7660_DEFAULT_I2C_ADDR);

    ## Exit handlers ##
    # This function 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, including functions from myDigitalAccelerometer
    def exitHandler():
        print("Exiting")
        sys.exit(0)

    # Register exit handlers
    atexit.register(exitHandler)
    signal.signal(signal.SIGINT, SIGINTHandler)

    # place device in standby mode so we can write registers
    myDigitalAccelerometer.setModeStandby()

    # enable 64 samples per second
    myDigitalAccelerometer.setSampleRate(upmMMA7660.MMA7660_AUTOSLEEP_64)

    # place device into active mode
    myDigitalAccelerometer.setModeActive()

    ax = upmMMA7660.new_floatp()
    ay = upmMMA7660.new_floatp()
    az = upmMMA7660.new_floatp()

    while (1):
        myDigitalAccelerometer.getAcceleration(ax, ay, az)
        outputStr = ("Acceleration: x = {0}"
                     "g y = {1}"
                     "g z = {2}g").format(upmMMA7660.floatp_value(ax),
        upmMMA7660.floatp_value(ay),
        upmMMA7660.floatp_value(az))
        print(outputStr)
        print()
        time.sleep(.5)

if __name__ == '__main__':
    main()