upm/examples/python/md.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
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# 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
from upm import pyupm_md as upmmd

def main():
    I2C_BUS = upmmd.MD_I2C_BUS
    I2C_ADDR = upmmd.MD_DEFAULT_I2C_ADDR

    # Instantiate an I2C Motor Driver on I2C bus 0
    myMotorDriver = upmmd.MD(I2C_BUS, I2C_ADDR)

    # set direction to CW and set speed to 50%
    print("Spin M1 and M2 at half speed for 3 seconds")
    myMotorDriver.setMotorDirections(upmmd.MD_DIR_CW, upmmd.MD_DIR_CW)
    myMotorDriver.setMotorSpeeds(127, 127)

    time.sleep(3)
    # counter clockwise
    print("Reversing M1 and M2 for 3 seconds")
    myMotorDriver.setMotorDirections(upmmd.MD_DIR_CCW,
                                     upmmd.MD_DIR_CCW)
    time.sleep(3)

    print("Stopping motors")
    myMotorDriver.setMotorSpeeds(0, 0)

if __name__ == '__main__':
    main()