Demonstration of possible usage of the NFC EEPROM class (including support for ST25DV NFC chip)
Dependencies: eeprom_driver
source/main.cpp
- Committer:
- apalmieri
- Date:
- 2020-01-28
- Revision:
- 6:462737ad2938
- Parent:
- 0:86f202e07059
File content as of revision 6:462737ad2938:
/* mbed Microcontroller Library * Copyright (c) 2018-2018 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "events/EventQueue.h" #include "nfc/ndef/MessageBuilder.h" #include "nfc/ndef/common/URI.h" #include "nfc/ndef/common/util.h" #include "NFCEEPROM.h" #include "EEPROMDriver.h" using events::EventQueue; using mbed::nfc::NFCEEPROM; using mbed::nfc::NFCEEPROMDriver; using mbed::Span; using mbed::nfc::ndef::MessageBuilder; using mbed::nfc::ndef::common::URI; using mbed::nfc::ndef::common::span_from_cstr; /* URL that will be written into the tag */ const char url_string[] = "mbed.com"; class EEPROMExample : mbed::nfc::NFCEEPROM::Delegate { public: EEPROMExample(events::EventQueue& queue, NFCEEPROMDriver& eeprom_driver) : _ndef_buffer(), _eeprom(&eeprom_driver, &queue, _ndef_buffer), _queue(queue) { } void run() { if (_eeprom.initialize() != NFC_OK) { printf("failed to initialise\r\n"); _queue.break_dispatch(); } _eeprom.set_delegate(this); _queue.call(&_eeprom, &NFCEEPROM::write_ndef_message); } private: virtual void on_ndef_message_written(nfc_err_t result) { if (result == NFC_OK) { printf("message written successfully\r\n"); } else { printf("failed to write (error: %d)\r\n", result); } _queue.call(&_eeprom, &NFCEEPROM::read_ndef_message); } virtual void on_ndef_message_read(nfc_err_t result) { if (result == NFC_OK) { printf("message read successfully\r\n"); } else { printf("failed to read (error: %d)\r\n", result); } } virtual void parse_ndef_message(const Span<const uint8_t> &buffer) { printf("Received an ndef message of size %d\r\n", buffer.size()); } virtual size_t build_ndef_message(const Span<uint8_t> &buffer) { printf("Building an ndef message\r\n"); /* create a message containing the URL */ MessageBuilder builder(buffer); /* URI expected a non-null terminated string so we use a helper function that casts * the pointer into a Span of size smaller by one */ URI uri(URI::HTTPS_WWW, span_from_cstr(url_string)); uri.append_as_record(builder, true); return builder.get_message().size(); } private: uint8_t _ndef_buffer[1024]; NFCEEPROM _eeprom; EventQueue& _queue; }; int main() { EventQueue queue; NFCEEPROMDriver& eeprom_driver = get_eeprom_driver(queue); EEPROMExample example(queue, eeprom_driver); example.run(); queue.dispatch_forever(); return 0; }