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60 lines
2.1 KiB
JavaScript
60 lines
2.1 KiB
JavaScript
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/*jslint node:true, vars:true, bitwise:true, unparam:true */
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/*jshint unused:true */
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/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2015 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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var nfcTagObj = require('jsupm_m24lr64e');
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// Instantiate a M24LR64E Grove NFC Tag Module on UART 0
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var nfcTag = new nfcTagObj.M24LR64E(nfcTagObj.M24LR64E_I2C_BUS);
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// This example accesses the device in the 'user' (default) mode,
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// reads the last byte of data in the EEPROM, inverts it, writes
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// it back, and then re-reads it.
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// Read the last byte of the EEPROM area
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var addr = (nfcTagObj.M24LR64E.EEPROM_I2C_LENGTH - 1);
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console.log("Address: " + addr);
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var byte = nfcTag.readByte(addr);
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console.log("Read byte: " + byte.toString(16));
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// Now change it to it's opposite and write it
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byte = (~byte & 0xff);
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nfcTag.writeByte(addr, byte);
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console.log("Wrote inverted byte: " + byte.toString(16));
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// Now read it back.
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byte = nfcTag.readByte(addr);
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console.log("Read byte: " + byte.toString(16));
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// clean up
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nfcTag = null;
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nfcTagObj.cleanUp();
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nfcTagObj = null;
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console.log("Exiting...");
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process.exit(0);
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