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28
USDK/example_sources/nfc/readme.txt
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28
USDK/example_sources/nfc/readme.txt
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Example Description
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This example describes how to use nfc interface.
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Requirement Components:
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1. nfc reader.
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Ex. Smart phone which has NFC reader. In Android, you can use below app
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NFC Tag reader
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https://play.google.com/store/apps/details?id=com.nxp.taginfolite
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NFC Tag reader & writer
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https://play.google.com/store/apps/details?id=com.wakdev.wdnfc
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NFC tag writer
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https://play.google.com/store/apps/details?id=com.nxp.nfc.tagwriter
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2. Connect NFC antenna.
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By default the NFC antenna is provided but not connected.
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You can choose your desired antenna and weld it on the board
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Verification Steps:
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(a) Open nfc reader app, Tap phone on NFC antenna, then the ndef message content is text "HELLO WORLD!"
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(b) Open nfc writer app, write something to the tag. (Ex. text message "abcdefg")
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It'll also dump raw data on the log.
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(c) Open nfc reader app, tap phone on NFC antenna, and check if the conten is exactly the same as previous move.
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220
USDK/example_sources/nfc/src/main.c
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USDK/example_sources/nfc/src/main.c
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/*
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* Routines to access hardware
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*
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* Copyright (c) 2015 Realtek Semiconductor Corp.
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*
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* This module is a confidential and proprietary property of RealTek and
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* possession or use of this module requires written permission of RealTek.
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*/
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#include "cmsis_os.h"
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#include "diag.h"
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#include "main.h"
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#include "nfc_api.h"
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#include "flash_api.h"
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#define NFC_RESTORE_DEFAULT (0)
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#define NFC_MAX_PAGE_NUM 36
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nfctag_t nfctag;
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unsigned int nfc_tag_content[NFC_MAX_PAGE_NUM];
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unsigned char nfc_tag_dirty[NFC_MAX_PAGE_NUM];
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#define RTK_NFC_UID 0x58
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unsigned char nfc_default_uid[7] = {
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RTK_NFC_UID, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06
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};
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osThreadId nfc_tid = 0;
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#define FLASH_APP_NFC_BASE 0x85000
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flash_t flash_nfc;
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void nfc_event_listener(void *arg, unsigned int event) {
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switch(event) {
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case NFC_EV_READER_PRESENT:
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DiagPrintf("NFC_EV_READER_PRESENT\r\n");
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break;
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case NFC_EV_READ:
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DiagPrintf("NFC_EV_READ\r\n");
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break;
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case NFC_EV_WRITE:
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DiagPrintf("NFC_EV_WRITE\r\n");
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break;
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case NFC_EV_ERR:
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DiagPrintf("NFC_EV_ERR\r\n");
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break;
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case NFC_EV_CACHE_READ:
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DiagPrintf("NFC_EV_CACHE_READ\r\n");
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break;
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}
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}
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/**
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* This callback function is called several times if tag is being written multiple pages.
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* DO NOT put heavy task here otherwise it will block tag write and cause timeout failure.
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**/
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void nfc_write_listener(void *arg, unsigned int page, unsigned int pgdat) {
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nfc_tag_content[page] = pgdat;
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nfc_tag_dirty[page] = 1;
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if (nfc_tid) {
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osSignalSet(nfc_tid, NFC_EV_WRITE);
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}
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}
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int is_valid_nfc_uid() {
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int valid_content = 1;
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unsigned char uid[7];
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unsigned char bcc[2];
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uid[0] = (unsigned char)((nfc_tag_content[0] & 0x000000FF) >> 0);
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uid[1] = (unsigned char)((nfc_tag_content[0] & 0x0000FF00) >> 8);
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uid[2] = (unsigned char)((nfc_tag_content[0] & 0x00FF0000) >> 16);
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bcc[0] = (unsigned char)((nfc_tag_content[0] & 0xFF000000) >> 24);
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uid[3] = (unsigned char)((nfc_tag_content[1] & 0x000000FF) >> 0);
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uid[4] = (unsigned char)((nfc_tag_content[1] & 0x0000FF00) >> 8);
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uid[5] = (unsigned char)((nfc_tag_content[1] & 0x00FF0000) >> 16);
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uid[6] = (unsigned char)((nfc_tag_content[1] & 0xFF000000) >> 24);
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bcc[1] = (unsigned char)((nfc_tag_content[2] & 0x000000FF) >> 0);
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// verify Block Check Character
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if (bcc[0] != (0x88 ^ uid[0] ^ uid[1] ^ uid[2])) {
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valid_content = 0;
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}
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if (bcc[1] != (uid[3] ^ uid[4] ^ uid[5] ^ uid[6])) {
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valid_content = 0;
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}
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return valid_content;
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}
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unsigned int generate_default_tag_content() {
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unsigned int page_size = 0;
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memset(nfc_tag_content, 0, NFC_MAX_PAGE_NUM * sizeof(unsigned int));
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// calculate Block Check Character
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unsigned char bcc[2];
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bcc[0] = 0x88 ^ nfc_default_uid[0] ^ nfc_default_uid[1] ^ nfc_default_uid[2];
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bcc[1] = nfc_default_uid[3] ^ nfc_default_uid[4] ^ nfc_default_uid[5] ^ nfc_default_uid[6];
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// generate header
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nfc_tag_content[page_size++] = ((unsigned int)nfc_default_uid[0]) << 0 |
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((unsigned int)nfc_default_uid[1]) << 8 |
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((unsigned int)nfc_default_uid[2]) << 16 |
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((unsigned int) bcc[0]) << 24;
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nfc_tag_content[page_size++] = ((unsigned int)nfc_default_uid[3]) << 0 |
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((unsigned int)nfc_default_uid[4]) << 8 |
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((unsigned int)nfc_default_uid[5]) << 16 |
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((unsigned int)nfc_default_uid[6]) << 24;
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nfc_tag_content[page_size++] = ((unsigned int) bcc[1]) << 0;
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nfc_tag_content[page_size++] = 0x001211E1;
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// Init tag content as NDEF will-known text message "HELLO WORLD!" in little endian
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nfc_tag_content[page_size++] = 0x01d11303;
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nfc_tag_content[page_size++] = 0x6502540f;
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nfc_tag_content[page_size++] = 0x4c45486e;
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nfc_tag_content[page_size++] = 0x57204f4c;
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nfc_tag_content[page_size++] = 0x444c524f;
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nfc_tag_content[page_size++] = 0x0000fe21;
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return page_size;
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}
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void nfc_load_tag_content_from_flash() {
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int i, address, page_size;
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memset(nfc_tag_content, 0, NFC_MAX_PAGE_NUM * sizeof(unsigned int));
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memset(nfc_tag_dirty, 0, NFC_MAX_PAGE_NUM);
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for (i = 0, address = FLASH_APP_NFC_BASE; i < NFC_MAX_PAGE_NUM; i++, address+=4) {
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flash_read_word(&flash_nfc, address, &nfc_tag_content[i]);
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}
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if (!is_valid_nfc_uid() || NFC_RESTORE_DEFAULT) {
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DiagPrintf("Invalid tag content, restore to default value\r\n");
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page_size = generate_default_tag_content();
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// update to flash
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flash_erase_sector(&flash_nfc, FLASH_APP_NFC_BASE);
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for (i = 0, address = FLASH_APP_NFC_BASE; i < page_size; i++, address += 4) {
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flash_write_word(&flash_nfc, address, nfc_tag_content[i]);
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}
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}
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}
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void nfc_store_tag_content() {
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int i, address;
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int modified_page_count;
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// dump the modified tag content
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modified_page_count = 0;
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for (i = 4; i < NFC_MAX_PAGE_NUM && nfc_tag_dirty[i]; i++) {
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modified_page_count++;
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DiagPrintf("page:%02d data:%08x\r\n", i, nfc_tag_content[i]);
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}
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// update to cache from page 4
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nfc_cache_write(&nfctag, &(nfc_tag_content[4]), 4, modified_page_count);
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modified_page_count += 4; // we also need update tag header to flash which has size 4
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flash_erase_sector(&flash_nfc, FLASH_APP_NFC_BASE);
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for (i = 0, address = FLASH_APP_NFC_BASE; i < modified_page_count; i++, address += 4) {
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flash_write_word(&flash_nfc, address, nfc_tag_content[i]);
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}
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}
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void nfc_task(void const *arg) {
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int i;
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osEvent evt;
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nfc_load_tag_content_from_flash();
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nfc_init(&nfctag, nfc_tag_content);
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nfc_event(&nfctag, nfc_event_listener, NULL, 0xFF);
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nfc_write(&nfctag, nfc_write_listener, NULL);
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osSignalClear(nfc_tid, NFC_EV_WRITE);
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while(1) {
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evt = osSignalWait (0, 0xFFFFFFFF); // wait for any signal with max timeout
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if (evt.status == osEventSignal && (evt.value.signals & NFC_EV_WRITE)) {
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osDelay(300);
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nfc_store_tag_content();
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memset(nfc_tag_dirty, 0, NFC_MAX_PAGE_NUM);
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osSignalClear(nfc_tid, NFC_EV_WRITE);
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}
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}
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}
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/**
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* @brief Main program.
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* @param None
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* @retval None
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*/
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void main(void)
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{
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osThreadDef(nfc_task, osPriorityRealtime, 1, 1024);
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nfc_tid = osThreadCreate (osThread (nfc_task), NULL);
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DBG_INFO_MSG_OFF(_DBG_SPI_FLASH_);
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//3 3)Enable Schedule, Start Kernel
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#if defined(CONFIG_KERNEL) && !TASK_SCHEDULER_DISABLED
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#ifdef PLATFORM_FREERTOS
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vTaskStartScheduler();
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#endif
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#else
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RtlConsolTaskRom(NULL);
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#endif
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while(1);
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}
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