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