#!/usr/bin/env python # Author: Jon Trulson # 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()