#!/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_adafruitms1438 as upmAdafruitms1438

def main():
    # Import header values
    I2CBus = upmAdafruitms1438.ADAFRUITMS1438_I2C_BUS
    I2CAddr = upmAdafruitms1438.ADAFRUITMS1438_DEFAULT_I2C_ADDR

    M3Motor = upmAdafruitms1438.AdafruitMS1438.MOTOR_M3
    MotorDirCW = upmAdafruitms1438.AdafruitMS1438.DIR_CW
    MotorDirCCW = upmAdafruitms1438.AdafruitMS1438.DIR_CCW

    # Instantiate an Adafruit MS 1438 on I2C bus 0
    myMotorShield = upmAdafruitms1438.AdafruitMS1438(I2CBus, I2CAddr)

    ## 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,
    # including functions from myMotorShield
    def exitHandler():
        myMotorShield.disableMotor(M3Motor)
        print("Exiting")
        sys.exit(0)

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

    # Setup for use with a DC motor connected to the M3 port

    # set a PWM period of 50Hz
    myMotorShield.setPWMPeriod(50)

    # disable first, to be safe
    myMotorShield.disableMotor(M3Motor)

    # set speed at 50%
    myMotorShield.setMotorSpeed(M3Motor, 50)
    myMotorShield.setMotorDirection(M3Motor, MotorDirCW)

    print ("Spin M3 at half speed for 3 seconds, "
    "then reverse for 3 seconds.")
    myMotorShield.enableMotor(M3Motor)

    time.sleep(3)

    print("Reversing M3")
    myMotorShield.setMotorDirection(M3Motor, MotorDirCCW)

    time.sleep(3)

    print("Stopping M3")

    # exitHandler runs automatically

if __name__ == '__main__':
    main()
