1/*jslint node:true, vars:true, bitwise:true, unparam:true */
2/*jshint unused:true */
3
4/*
5 * Author: Jon Trulson <jtrulson@ics.com>
6 * Copyright (c) 2015 Intel Corporation.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining
9 * a copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sublicense, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be
17 * included in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
23 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
24 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 */
27
28
29var nfcTagObj = require('jsupm_m24lr64e');
30
31// Instantiate a M24LR64E Grove NFC Tag Module on UART 0
32var nfcTag = new nfcTagObj.M24LR64E(nfcTagObj.M24LR64E_I2C_BUS);
33
34// This example accesses the device in the 'user' (default) mode,
35// reads the last byte of data in the EEPROM, inverts it, writes
36// it back, and then re-reads it.
37
38// Read the last byte of the EEPROM area
39var addr = (nfcTagObj.M24LR64E.EEPROM_I2C_LENGTH - 1);
40console.log("Address: " + addr);
41var byte = nfcTag.readByte(addr);
42
43console.log("Read byte: " + byte.toString(16));
44
45// Now change it to it's opposite and write it
46byte = (~byte & 0xff);
47nfcTag.writeByte(addr, byte);
48console.log("Wrote inverted byte: " + byte.toString(16));
49
50// Now read it back.
51byte = nfcTag.readByte(addr);
52console.log("Read byte: " + byte.toString(16));
53
54// clean up
55nfcTag = null;
56nfcTagObj.cleanUp();
57nfcTagObj = null;
58console.log("Exiting...");
59process.exit(0);
60