M5Unit-NFC/examples/UnitUnified/NFCV/Detect/main/Detect.cpp

/*
 * SPDX-FileCopyrightText: 2025 M5Stack Technology CO LTD
 *
 * SPDX-License-Identifier: MIT
 */
/*
  Example using M5UnitUnified for ST25R3916
  Detect NFC-V PICC
*/
#include <M5Unified.h>
#include <M5UnitUnified.h>
#include <M5UnitUnifiedNFC.h>
#include <M5Utility.h>
#include <vector>

// *************************************************************
// Choose one define symbol to match the unit you are using
// *************************************************************
#if !defined(USING_UNIT_NFC) && !defined(USING_CAP_CC1101)
// For UnitNFC
// #define USING_UNIT_NFC
// For CapNFC
// #define USING_CAP_CC1101
#endif

using namespace m5::nfc;
using namespace m5::nfc::v;

namespace {
auto& lcd = M5.Display;
m5::unit::UnitUnified Units;

#if defined(USING_UNIT_NFC)
#pragma message "Choose UnitNFC"
m5::unit::UnitNFC unit{};  // I2C
#elif defined(USING_CAP_CC1101)
#pragma message "Choose CapCC1101NFC"
m5::unit::CapCC1101NFC unit{};  // CapCC1101 (SPI)
#else
#error Choose unit please!
#endif
m5::nfc::NFCLayerV nfc_v{unit};
}  // namespace

void setup()
{
    M5.begin();
    M5.setTouchButtonHeightByRatio(100);

    auto cfg = unit.config();
    cfg.mode = NFC::V;
    unit.config(cfg);

#if defined(USING_UNIT_NFC)
    auto board = M5.getBoard();
    bool unit_ready{};
    // NessoN1: SoftwareI2C too slow for NFC RF timing -> use port_a (Wire) via else branch
    if (board == m5::board_t::board_M5NanoC6) {
        M5_LOGI("Using M5.Ex_I2C");
        unit_ready = Units.add(unit, M5.Ex_I2C) && Units.begin();
    } else {
        auto pin_num_sda = M5.getPin(m5::pin_name_t::port_a_sda);
        auto pin_num_scl = M5.getPin(m5::pin_name_t::port_a_scl);
        M5_LOGI("getPin: SDA:%u SCL:%u", pin_num_sda, pin_num_scl);
        Wire.end();
        Wire.begin(pin_num_sda, pin_num_scl, 400 * 1000U);
        unit_ready = Units.add(unit, Wire) && Units.begin();
    }
    if (!unit_ready) {
        M5_LOGE("Failed to begin");
        lcd.fillScreen(TFT_RED);
        while (true) {
            m5::utility::delay(10000);
        }
    }
#elif defined(USING_CAP_CC1101)
    if (!SPI.bus()) {
        auto spi_sclk = M5.getPin(m5::pin_name_t::sd_spi_sclk);
        auto spi_mosi = M5.getPin(m5::pin_name_t::sd_spi_mosi);
        auto spi_miso = M5.getPin(m5::pin_name_t::sd_spi_miso);
        M5_LOGI("getPin: %d,%d,%d", spi_sclk, spi_mosi, spi_miso);
        SPI.begin(spi_sclk, spi_miso, spi_mosi /* SS is shared SD, CC1101, ST25R3916 */);
    }

    SPISettings settings = {10000000, MSBFIRST, SPI_MODE1};
    if (!Units.add(unit, SPI, settings) || !Units.begin()) {
        M5_LOGE("Failed to begin");
        lcd.fillScreen(TFT_RED);
        while (true) {
            m5::utility::delay(10000);
        }
    }
#endif
    M5_LOGI("M5UnitUnified initialized");
    M5_LOGI("%s", Units.debugInfo().c_str());

    if (lcd.height() > lcd.width()) {
        lcd.setRotation(1);
    }
    lcd.setFont(&fonts::Font0);
    lcd.fillScreen(TFT_DARKGREEN);
    lcd.setCursor(0, 0);
}

void loop()
{
    M5.update();
    Units.update();

    std::vector<PICC> piccs;
    if (nfc_v.detect(piccs)) {
        M5.Speaker.tone(3000, 10);
        lcd.fillScreen(0);
        lcd.setCursor(0, 0);
        lcd.printf("%zu PICC\n", piccs.size());
        M5.Log.printf("%zu PICC\n", piccs.size());
        uint32_t idx{};
        for (auto&& u : piccs) {
            M5.Log.printf("PICC:%s %s %u\n", u.uidAsString().c_str(), u.typeAsString().c_str(), u.totalSize());
            lcd.printf("[%2u]:PICC:<%s> %s\n", static_cast<unsigned>(idx), u.uidAsString().c_str(),
                       u.typeAsString().c_str());
            ++idx;
        }
    }
}