1#!/usr/bin/python
2# Author: Jon Trulson <jtrulson@ics.com>
3# Copyright (c) 2015 Intel Corporation.
4#
5# Permission is hereby granted, free of charge, to any person obtaining
6# a copy of this software and associated documentation files (the
7# "Software"), to deal in the Software without restriction, including
8# without limitation the rights to use, copy, modify, merge, publish,
9# distribute, sublicense, and/or sell copies of the Software, and to
10# permit persons to whom the Software is furnished to do so, subject to
11# the following conditions:
12#
13# The above copyright notice and this permission notice shall be
14# included in all copies or substantial portions of the Software.
15#
16# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23
24import sys
25import pyupm_m24lr64e as nfcTagObj
26
27# Instantiate a M24LR64E Grove NFC Tag Module on UART 0
28nfcTag = nfcTagObj.M24LR64E(nfcTagObj.M24LR64E_I2C_BUS)
29
30# This example accesses the device in the 'user' (default) mode,
31# reads the last byte of data in the EEPROM, inverts it, writes
32# it back, and then re-reads it.
33
34# Read the last byte of the EEPROM area
35addr = (nfcTagObj.M24LR64E.EEPROM_I2C_LENGTH - 1)
36print "Address: ", addr
37byte = nfcTag.readByte(addr)
38
39print "Read byte: ", format(byte, '02x')
40
41# Now change it to it's opposite and write it
42byte = (~byte & 0xff)
43nfcTag.writeByte(addr, byte)
44print "Wrote inverted byte: ", format(byte, '02x')
45
46# Now read it back.
47byte = nfcTag.readByte(addr)
48print "Read byte: ", format(byte, '02x')
49
50