8968560565
Includes ESP-IDF NFC stack (deep capture, 4K Classic geometry, UL write API, open SoftAP), React dashboard with live tag diagnostics, and docs. README updated for APIs and lab Wi-Fi defaults. Made-with: Cursor
256 lines
7.0 KiB
C
256 lines
7.0 KiB
C
#include "nfc_engine/nfc_engine.h"
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#include "pn532_host/pn532_core.h"
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#include "esp_log.h"
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#include <stdio.h>
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#include <string.h>
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static const char *TAG = "nfc_engine";
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static uint8_t s_tg = 1;
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static void hint_type(nfc_tag_info_t *t)
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{
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switch (t->sak) {
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case 0x08:
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case 0x00:
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t->type_hint = 2;
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break;
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case 0x09:
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case 0x18:
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case 0x19:
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t->type_hint = 1;
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break;
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default:
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t->type_hint = 0;
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break;
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}
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}
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esp_err_t nfc_engine_init(void)
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{
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esp_err_t e = pn532_core_init();
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if (e != ESP_OK) {
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return e;
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}
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e = pn532_sam_config_normal();
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if (e != ESP_OK) {
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ESP_LOGW(TAG, "SAM config: %s", esp_err_to_name(e));
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}
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uint8_t ic = 0, hi = 0, lo = 0;
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if (pn532_get_firmware_version(&ic, &hi, &lo) == ESP_OK) {
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ESP_LOGI(TAG, "PN532 fw ic=0x%02x %u.%u", ic, hi, lo);
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}
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if (pn532_rf_max_retries() != ESP_OK) {
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ESP_LOGW(TAG, "RF max retries config failed");
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}
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return ESP_OK;
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}
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esp_err_t nfc_poll_passive_target(nfc_tag_info_t *out)
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{
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memset(out, 0, sizeof(*out));
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uint8_t resp[64];
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size_t rlen = 0;
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esp_err_t e = pn532_in_list_passive_target(1, 0x00, resp, sizeof(resp), &rlen);
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if (e != ESP_OK) {
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return e;
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}
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if (rlen < 2 || resp[0] != 0x00) {
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return ESP_ERR_INVALID_RESPONSE;
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}
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if (resp[1] < 1) {
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return ESP_ERR_NOT_FOUND;
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}
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if (rlen < 8) {
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return ESP_ERR_INVALID_RESPONSE;
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}
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s_tg = resp[2];
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out->atqa = (uint16_t)(((uint16_t)resp[3] << 8) | resp[4]);
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out->sak = resp[5];
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out->uid_len = resp[6];
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if (out->uid_len > NFC_MAX_UID_LEN || (size_t)(7 + out->uid_len) > rlen) {
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return ESP_ERR_INVALID_RESPONSE;
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}
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memcpy(out->uid, resp + 7, out->uid_len);
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hint_type(out);
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return ESP_OK;
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}
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static esp_err_t in_data_tg(const uint8_t *data, size_t data_len, uint8_t *response, size_t response_max,
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size_t *response_len)
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{
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uint8_t buf[64];
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if (data_len > sizeof(buf) - 3) {
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return ESP_ERR_INVALID_SIZE;
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}
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buf[0] = PN532_CMD_INDATAEXCHANGE;
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buf[1] = s_tg;
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memcpy(buf + 2, data, data_len);
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return pn532_send_cmd(buf, 2 + data_len, response, response_max, response_len, 500);
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}
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esp_err_t nfc_mifare_authenticate_block(const nfc_tag_info_t *tag, uint8_t block_no,
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const nfc_mifare_key_t *key)
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{
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uint8_t data[12];
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data[0] = key->key_b ? PN532_MIFARE_CMD_AUTH_B : PN532_MIFARE_CMD_AUTH_A;
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data[1] = block_no;
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memcpy(data + 2, key->key, 6);
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uint8_t uid_use[4];
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if (tag->uid_len == 4) {
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memcpy(uid_use, tag->uid, 4);
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} else if (tag->uid_len >= 7) {
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memcpy(uid_use, tag->uid + tag->uid_len - 4, 4);
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} else if (tag->uid_len > 4) {
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memcpy(uid_use, tag->uid + tag->uid_len - 4, 4);
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} else {
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return ESP_ERR_INVALID_ARG;
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}
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memcpy(data + 8, uid_use, 4);
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uint8_t resp[32];
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size_t rlen = 0;
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esp_err_t e = in_data_tg(data, sizeof(data), resp, sizeof(resp), &rlen);
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if (e != ESP_OK) {
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return e;
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}
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if (rlen < 1 || resp[0] != 0x00) {
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return ESP_FAIL;
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}
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return ESP_OK;
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}
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esp_err_t nfc_mifare_read_block(uint8_t block_no, uint8_t block[NFC_BLOCK_LEN])
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{
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uint8_t d[] = {PN532_MIFARE_CMD_READ, block_no};
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uint8_t resp[32];
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size_t rlen = 0;
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esp_err_t e = in_data_tg(d, sizeof(d), resp, sizeof(resp), &rlen);
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if (e != ESP_OK) {
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return e;
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}
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if (rlen < 1 + NFC_BLOCK_LEN || resp[0] != 0x00) {
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return ESP_ERR_INVALID_RESPONSE;
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}
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memcpy(block, resp + 1, NFC_BLOCK_LEN);
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return ESP_OK;
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}
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esp_err_t nfc_mifare_write_block(uint8_t block_no, const uint8_t block[NFC_BLOCK_LEN])
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{
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uint8_t d[2 + NFC_BLOCK_LEN];
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d[0] = PN532_MIFARE_CMD_WRITE;
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d[1] = block_no;
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memcpy(d + 2, block, NFC_BLOCK_LEN);
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uint8_t resp[16];
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size_t rlen = 0;
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esp_err_t e = in_data_tg(d, sizeof(d), resp, sizeof(resp), &rlen);
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if (e != ESP_OK) {
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return e;
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}
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if (rlen < 1 || resp[0] != 0x00) {
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return ESP_FAIL;
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}
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return ESP_OK;
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}
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esp_err_t nfc_ultralight_read_page(uint8_t page, uint8_t data[4])
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{
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uint8_t d[] = {PN532_MIFARE_CMD_READ, page};
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uint8_t resp[32];
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size_t rlen = 0;
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esp_err_t e = in_data_tg(d, sizeof(d), resp, sizeof(resp), &rlen);
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if (e != ESP_OK) {
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return e;
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}
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if (rlen < 1 + 16 || resp[0] != 0x00) {
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return ESP_ERR_INVALID_RESPONSE;
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}
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memcpy(data, resp + 1, 4);
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return ESP_OK;
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}
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esp_err_t nfc_ultralight_write_page(uint8_t page, const uint8_t data[4])
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{
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uint8_t d[6] = {0xA2, page, data[0], data[1], data[2], data[3]};
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uint8_t resp[16];
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size_t rlen = 0;
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esp_err_t e = in_data_tg(d, sizeof(d), resp, sizeof(resp), &rlen);
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if (e != ESP_OK) {
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return e;
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}
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if (rlen < 1 || resp[0] != 0x00) {
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return ESP_FAIL;
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}
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return ESP_OK;
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}
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esp_err_t nfc_ul_fast_read(uint8_t start_page, uint8_t *out, size_t out_max, size_t *got)
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{
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*got = 0;
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size_t off = 0;
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uint8_t d[2] = {0x3A, start_page};
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uint8_t resp[256];
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size_t rlen = 0;
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esp_err_t e = in_data_tg(d, sizeof(d), resp, sizeof(resp), &rlen);
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if (e != ESP_OK) {
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return e;
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}
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if (rlen < 2 || resp[0] != 0x00) {
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return ESP_ERR_INVALID_RESPONSE;
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}
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size_t payload = rlen - 1;
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if (payload > out_max) {
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payload = out_max;
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}
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memcpy(out, resp + 1, payload);
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off = payload;
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*got = off;
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return ESP_OK;
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}
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cJSON *nfc_tag_to_json(const nfc_tag_info_t *tag)
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{
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cJSON *o = cJSON_CreateObject();
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if (!o) {
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return NULL;
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}
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char uidhex[NFC_MAX_UID_LEN * 2 + 4];
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for (int i = 0; i < tag->uid_len; i++) {
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snprintf(uidhex + i * 2, 3, "%02X", tag->uid[i]);
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}
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uidhex[tag->uid_len * 2] = 0;
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cJSON_AddStringToObject(o, "uid", uidhex);
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cJSON_AddNumberToObject(o, "uidLen", tag->uid_len);
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cJSON_AddNumberToObject(o, "atqa", tag->atqa);
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cJSON_AddNumberToObject(o, "sak", tag->sak);
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cJSON_AddNumberToObject(o, "typeHint", tag->type_hint);
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char aq[8];
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snprintf(aq, sizeof aq, "%04X", (unsigned)tag->atqa);
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cJSON_AddStringToObject(o, "atqaHex", aq);
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char sk[8];
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snprintf(sk, sizeof sk, "%02X", tag->sak);
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cJSON_AddStringToObject(o, "sakHex", sk);
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const char *guess = "Unknown / use Raw or RATS";
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if (tag->type_hint == 1) {
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guess = (tag->sak == 0x19) ? "MIFARE Classic 4K" : "MIFARE Classic 1K or compatible";
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} else if (tag->type_hint == 2) {
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guess = "Ultralight / NTAG / Type 2 family";
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}
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cJSON_AddStringToObject(o, "typeGuess", guess);
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uint8_t gs[32];
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size_t gl = 0;
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if (pn532_get_general_status(gs, sizeof(gs), &gl) == ESP_OK && gl > 0) {
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cJSON *arr = cJSON_CreateArray();
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if (arr) {
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for (size_t i = 0; i < gl; i++) {
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cJSON_AddItemToArray(arr, cJSON_CreateNumber(gs[i]));
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}
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cJSON_AddItemToObject(o, "pn532GeneralStatus", arr);
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}
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}
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return o;
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}
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