#!/usr/bin/env 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 sys
from upm import pyupm_m24lr64e as nfcTagObj

def main():
    # Instantiate a M24LR64E Grove NFC Tag Module on UART 0
    nfcTag = nfcTagObj.M24LR64E(nfcTagObj.M24LR64E_I2C_BUS)

    # This example accesses the device in the 'user' (default) mode,
    # reads the last byte of data in the EEPROM, inverts it, writes
    # it back, and then re-reads it.

    # Read the last byte of the EEPROM area
    addr = (nfcTagObj.M24LR64E.EEPROM_I2C_LENGTH - 1)
    print("Address: ", addr)
    byte = nfcTag.readByte(addr)

    print("Read byte: ", format(byte, '02x'))

    # Now change it to it's opposite and write it
    byte = (~byte & 0xff)
    nfcTag.writeByte(addr, byte)
    print("Wrote inverted byte: ", format(byte, '02x'))

    # Now read it back.
    byte = nfcTag.readByte(addr)
    print("Read byte: ", format(byte, '02x'))

if __name__ == '__main__':
    main()
