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#Get acceleration data from Chronos watch.
#Taken from info posted at: http://e2e.ti.com/support/microcontrollers/msp43016-bit_ultra-low_power_mcus/f/166/t/32714.aspx
#x, y, and z values may not be "in order". The first three bytes from the packet
#of data sent from the watch seemed to be different than what was listed
#on the page, though the datatype byte was in the correct place. So YMMV.
#
#Written by Sean Brewer (seabre)
#seabre986@gmail.com
#


import serial
import array

def startAccessPoint():
    return array.array('B', [0xFF, 0x07, 0x03]).tostring()

def accDataRequest():
    return array.array('B', [0xFF, 0x08, 0x07, 0x00, 0x00, 0x00, 0x00]).tostring()

#Open COM port 6 (check your system info to see which port
#yours is actually on.)
#argments are 5 (COM6), 115200 (bit rate), and timeout is set so
#the serial read function won't loop forever.
ser = serial.Serial(5,115200,timeout=1)

#Start access point
ser.write(startAccessPoint())


while True:
    #Send request for acceleration data
    ser.write(accDataRequest())
    accel = ser.read(7)

    if len(accel) != 7 or (ord(accel[0]) == 0 and ord(accel[1]) == 0 and ord(accel[2]) == 0):
        continue
    print "x: " + str(ord(accel[2])) + " y: " + str(ord(accel[1])) + " z: " + str(ord(accel[0]))
    print "Datatype: " + str(ord(accel[3]))
    
ser.close()