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This module was developed and tested on the Grove NFC Tag. It is an 8KB EEPROM accessable (with various protection capabilites) via I2C and NFC capable devices. The code was based on the Seeed Studio example code with some help from the datasheet. Signed-off-by: Jon Trulson <jtrulson@ics.com> Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
/*
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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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#include <unistd.h>
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#include <iostream>
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#include "m24lr64e.h"
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using namespace std;
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using namespace upm;
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int main(int argc, char **argv)
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{
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//! [Interesting]
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// Instantiate an M24LR64E on I2C bus 0
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upm::M24LR64E *nfcTag = new upm::M24LR64E(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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int addr = M24LR64E::EEPROM_I2C_LENGTH - 1;
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printf("Address: %d\n", addr);
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uint8_t byte = nfcTag->readByte(addr);
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printf("Read byte: %02x\n", byte);
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// Now change it to it's opposite and write it
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byte = ~byte;
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nfcTag->writeByte(addr, byte);
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printf("Wrote inverted byte: %02x\n", byte);
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// Now read it back.
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byte = nfcTag->readByte(addr);
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printf("Read byte: %02x\n", byte);
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//! [Interesting]
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cout << "Exiting..." << endl;
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delete nfcTag;
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return 0;
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}
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