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      1 /*jslint node:true, vars:true, bitwise:true, unparam:true */
      2 /*jshint unused:true */
      3 
      4 /*
      5  * Author: Jon Trulson <jtrulson (at) 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 
     29 var nfcTagObj = require('jsupm_m24lr64e');
     30 
     31 // Instantiate a M24LR64E Grove NFC Tag Module on UART 0
     32 var 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
     39 var addr = (nfcTagObj.M24LR64E.EEPROM_I2C_LENGTH - 1);
     40 console.log("Address: " + addr);
     41 var byte = nfcTag.readByte(addr);
     42 
     43 console.log("Read byte: " + byte.toString(16));
     44 
     45 // Now change it to it's opposite and write it
     46 byte = (~byte & 0xff);
     47 nfcTag.writeByte(addr, byte);
     48 console.log("Wrote inverted byte: " + byte.toString(16));
     49 
     50 // Now read it back.
     51 byte = nfcTag.readByte(addr);
     52 console.log("Read byte: " + byte.toString(16));
     53 
     54 // clean up
     55 nfcTag = null;
     56 nfcTagObj.cleanUp();
     57 nfcTagObj = null;
     58 console.log("Exiting...");
     59 process.exit(0);
     60