表示保存部（M5Stack CORE BASIC）の詳細です。

表示部概要

M5Stack CORE BASICにRTCを取り付けます。

回路図

Arduino IDE（最新版）の設定

ボードマネージャー
M5 → 「M5Core」
最新版のボードマネージャーを使用してください。
ライブラリ
- RTC DS3231（I2C接続） → RTClib by Adafruit Ver.2.1.4
- SimpleFTPServer → SimpleFTPServer by Renzo Mischianti Ver.3.0.2
- SdFAT.h → SdFat by Bill Greiman Ver.2.3.0

プログラムの概要

各種初期化を行い、待機状態になります。
FTPで受信したデータはLittleFSに置かれます。
img.jpg は画面表示に使用します。
img2.jpg はSDカードの /cam0 フォルダ内にある img-xxx.jpg のxxx番号+1の値で保存します。
sound.wav はSDカードの /cam0 フォルダ内にある snd-xxx.wav のxxx番号+1の値で保存します。

その他操作：

ボタン1（左）を長押し：最後に保存された画像を表示します。
ボタン3（右）を長押し：WiFi接続してRTCの時刻をセットします。

プログラム


M5-RTC-FTP_Server.ino
/*
  M5Stack Basic FTP Image Viewer & Auto Rename Saver
  Improved & Fixed Version
*/
#include <Wire.h>
#include "RTClib.h"
#include <time.h>
#include <WiFi.h>
#include <SPI.h>
#include <SdFat.h>
SdFat SD; //ここで実際にSDオブジェクトを作成（定義）する ので良い
#include <LittleFS.h>
#include <M5Unified.h>
#include <SimpleFTPServer.h>
#define SD_SPI_SCK 18
#define SD_SPI_MISO 19
#define SD_SPI_MOSI 23
#define SD_SPI_CS 4
//==================================================
// WiFi & NTP
//==================================================
const char* AP_SSID = "M5Stack_FTP";
const char* AP_PASS = "12345678";
const char* STA_SSID = "NTP-Set-WiFi"; // ← Change
const char* STA_PASS = "WiFiPASSWD"; // ← Change
// WiFi & NTP
const char* ntpServer = "ntp.nict.jp";
const long gmtOffset_sec = 9 * 3600; // 日本時間 (JST)
const int daylightOffset_sec = 0;
// NTP同期関数（後述）
RTC_DS3231 Rtc;
//==================================================
// FTP
//==================================================
FtpServer ftpServer;
//==================================================
// File Paths
//==================================================
const char* IMG2_PATH_LITTLEFS = "/img2.jpg";
const char* IMG_PATH_LITTLEFS = "/img.jpg";
const char* WAV_PATH_LITTLEFS = "/sound.wav";
const char* CAM0_DIR = "/cam0";
//==================================================
// Upload Detection (use timestamps or counters for robustness)
//==================================================
struct UploadState {
  bool img2 = false;
  bool img = false;
  bool wav = false;
  unsigned long lastUploadMs = 0;
} uploadState;
//==================================================
// RTCの同期をとります
//==================================================
bool syncRTCfromNTP() {
        int retry = 0;//
        int timeout = 0;//
    Serial.println("=== NTP Sync Start (BtnC) ===");
    bool success = false;
    // 1. APモードを止めてSTAモードに切り替え
    WiFi.disconnect(true);
    delay(200);
    WiFi.mode(WIFI_STA);
    delay(200);
    WiFi.begin(STA_SSID, STA_PASS);
    delay(200);
    Serial.printf("Connecting to %s ", STA_SSID);
    while (WiFi.status() != WL_CONNECTED && retry < 30) {
        delay(1000);
        Serial.print(".");
        retry++;
        M5.Display.fillScreen(TFT_BLACK);
        M5.Display.setCursor(0, 0);
        M5.Display.setTextSize(2);
        M5.Display.printf("WiFi Connecting...\n%d/30", retry);
    }
    if (WiFi.status() != WL_CONNECTED) {
        Serial.println("\nWiFi Connect Failed");
        M5.Display.fillScreen(TFT_BLACK);
        M5.Display.setCursor(0, 0);
        M5.Display.println("WiFi Failed");
        delay(2000);
        goto restore;
    }
    Serial.println("\nWiFi Connected!");
    M5.Display.fillScreen(TFT_BLACK);
    M5.Display.setCursor(0, 0);
    M5.Display.println("WiFi OK");
    // 2. NTP設定
    configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
    // 3. 時刻取得
    struct tm timeinfo;
    Serial.println("Getting NTP time...");
// int timeout = 0;
    while (!getLocalTime(&timeinfo) && timeout < 20) {
        delay(500);
        timeout++;
        Serial.print(".");
    }
    if (!getLocalTime(&timeinfo)) {
        Serial.println("\nNTP Get Failed");
        M5.Display.fillScreen(TFT_BLACK);
        M5.Display.setCursor(0, 0);
        M5.Display.println("NTP Failed");
        delay(2000);
    } else {
        // 成功時のみRTC更新
        DateTime ntpTime(
            timeinfo.tm_year + 1900,
            timeinfo.tm_mon + 1,
            timeinfo.tm_mday,
            timeinfo.tm_hour,
            timeinfo.tm_min,
            timeinfo.tm_sec
        );
        Rtc.adjust(ntpTime);
        Serial.println("RTC Updated from NTP!");
        Serial.printf("%04d/%02d/%02d %02d:%02d:%02d\n",
                      ntpTime.year(), ntpTime.month(), ntpTime.day(),
                      ntpTime.hour(), ntpTime.minute(), ntpTime.second());
        M5.Display.fillScreen(TFT_BLACK);
        M5.Display.setCursor(0, 0);
        M5.Display.setTextSize(2);
        M5.Display.println("RTC Synced!");
        M5.Display.printf("%04d/%02d/%02d\n%02d:%02d:%02d",
                          ntpTime.year(), ntpTime.month(), ntpTime.day(),
                          ntpTime.hour(), ntpTime.minute(), ntpTime.second());
        delay(3000);
        success = true;
    }
restore:
    // 4. 必ずAPモードに戻す
    WiFi.disconnect(true);
    delay(1000);
    WiFi.mode(WIFI_AP);
        delay(1000);
    WiFi.softAP(AP_SSID, AP_PASS, 6, 0, 4);
        delay(1000);
    Serial.println("Restored AP Mode");
    M5.Display.fillScreen(TFT_BLACK);
    M5.Display.setCursor(0, 0);
    M5.Display.setTextSize(2);
    M5.Display.println("FTP AP MODE");
    M5.Display.println(WiFi.softAPIP());
    return success;
}
//==================================================
// SdFat alias
//==================================================
// Get next sequential number (more robust)
int getNextFileNumber(const char* prefix, const char* extension) {
    int maxNum = 0;
    FsFile dir, file;
    if (!dir.open(CAM0_DIR)) {
        Serial.println("Cannot open /cam0");
        return 1;
    }
    while (file.openNext(&dir, O_RDONLY)) {
        if (file.isDirectory()) {
            file.close();
            continue;
        }
        char name[64];
        file.getName(name, sizeof(name));
        String nameStr = name;
        String fullPrefix = String(prefix) + "-";
        if (nameStr.startsWith(fullPrefix) && nameStr.endsWith(extension)) {
            String numStr = nameStr.substring(fullPrefix.length(),
                                             nameStr.length() - strlen(extension));
            int num = numStr.toInt();
            if (num > maxNum) maxNum = num;
        }
        file.close();
    }
    dir.close();
    maxNum = min(maxNum + 1, 999);
    Serial.printf("Next %s%s → %03d\n", prefix, extension, maxNum);
    return maxNum;
}
//==================================================
// Save with timestamp
//==================================================
bool saveRenamedFileFromLittleFS(const char* srcPath, const char* prefix, const char* extension) {
    if (!LittleFS.exists(srcPath)) {
        Serial.printf("Source %s not found\n", srcPath);
        return false;
    }
    DateTime now = Rtc.now();
    int nextNum = getNextFileNumber(prefix, extension);
   
    char newPath[64];
    snprintf(newPath, sizeof(newPath), "%s/%s-%03d%s", CAM0_DIR, prefix, nextNum, extension);
    Serial.printf("Copy: %s → %s\n", srcPath, newPath);
    File source = LittleFS.open(srcPath, FILE_READ);
    FsFile dest;
    if (!source || !dest.open(newPath, O_WRONLY | O_CREAT | O_TRUNC)) {
        Serial.println("Open failed");
        if (source) source.close();
        return false;
    }
    const size_t bufSize = 512;
    uint8_t buffer[bufSize];
    size_t bytesRead;
    while ((bytesRead = source.read(buffer, bufSize)) > 0) {
        dest.write(buffer, bytesRead);
    }
    source.close();
    // Set timestamps
    uint16_t year = now.year();
    uint8_t mon = now.month();
    uint8_t day = now.day();
    uint8_t hour = now.hour();
    uint8_t min = now.minute();
    uint8_t sec = now.second();
    dest.timestamp(T_ACCESS, year, mon, day, hour, min, sec);
    dest.timestamp(T_CREATE, year, mon, day, hour, min, sec);
    dest.timestamp(T_WRITE, year, mon, day, hour, min, sec);
    dest.close();
    LittleFS.remove(srcPath);
    Serial.println("Saved with RTC timestamp");
    return true;
}
//==================================================
// Display
//==================================================
void displayImage() {
    if (!LittleFS.exists(IMG2_PATH_LITTLEFS)) {
        M5.Display.fillScreen(TFT_BLACK);
        M5.Display.setTextColor(TFT_RED);
        M5.Display.setCursor(0, 0);
        M5.Display.println("No img2.jpg");
        return;
    }
    M5.Display.fillScreen(TFT_BLACK);
    M5.Display.drawJpgFile(LittleFS, IMG2_PATH_LITTLEFS, 0, 0);
}
//==================================================
// FTP Callback
//==================================================
void ftpCallback(FtpOperation operation, uint32_t freeSpace, uint32_t totalSpace) {
    if (operation == FTP_UPLOAD) {
        uploadState.lastUploadMs = millis();
        if (LittleFS.exists(IMG2_PATH_LITTLEFS)) uploadState.img2 = true;
        if (LittleFS.exists(IMG_PATH_LITTLEFS)) uploadState.img = true;
        if (LittleFS.exists(WAV_PATH_LITTLEFS)) uploadState.wav = true;
    }
}
//==================================================
// Setup
//==================================================
void setup() {
    auto cfg = M5.config();
    M5.begin(cfg);
    Serial.begin(9600);
    M5.Display.setRotation(1);
    M5.Display.fillScreen(TFT_BLACK);
    M5.Display.setTextSize(2);
    M5.Display.setTextColor(TFT_WHITE);
delay(1000);
    // LittleFS
    if (!LittleFS.begin()) {
        LittleFS.format();
    }
    // SD
   if (!SD.begin(SdSpiConfig(SD_SPI_CS, SHARED_SPI, SD_SCK_MHZ(25)))) {
        M5.Display.println("SD MOUNT FAILED");
        while (1) delay(1000);
    }
    if (!SD.exists(CAM0_DIR)) SD.mkdir(CAM0_DIR);
delay(1000);
    // RTC
    Wire.begin(21, 22); //M5のGroveポートではない場所を使うときは直す
    if (!Rtc.begin()) {
        M5.Display.println("RTC NOT FOUND!");
        while (1) delay(100);
    }
        Rtc.adjust(DateTime(F(__DATE__), F(__TIME__))); // fallback
    // WiFi AP
    WiFi.mode(WIFI_AP);
    WiFi.softAP(AP_SSID, AP_PASS, 6, 0, 4);
    IPAddress ip = WiFi.softAPIP();
    M5.Display.println("FTP AP MODE");
    M5.Display.println(ip);
    // FTP
    ftpServer.setCallback(ftpCallback);
    ftpServer.begin("M5", "M5pass");
    Serial.println("System Ready");
}
//==================================================
// Loop
//==================================================
void loop() {
    M5.update();
    ftpServer.handleFTP();
    // ================== BtnC 長押しでNTP同期 ==================
    if (M5.BtnC.wasHold()) { // 500ms以上押し続けると発火
        syncRTCfromNTP();
    }
    unsigned long nowMs = millis();
    // Process uploads with small delay to let FTP finish writing
    if (uploadState.img && (nowMs - uploadState.lastUploadMs > 800)) {
        uploadState.img = false;
        saveRenamedFileFromLittleFS(IMG_PATH_LITTLEFS, "img", ".jpg");
    }
    if (uploadState.wav && (nowMs - uploadState.lastUploadMs > 800)) {
        uploadState.wav = false;
        saveRenamedFileFromLittleFS(WAV_PATH_LITTLEFS, "sound", ".wav");
    }
    if (uploadState.img2 && (nowMs - uploadState.lastUploadMs > 800)) {
        uploadState.img2 = false;
        displayImage();
    }
    // Button A - manual display
    if (M5.BtnA.wasPressed()) {
        displayImage();
    }
    delay(10);
}

※テストのため3分毎に撮影しています。

注意点

ボタン3長押しでRTC時刻セットは、必ずそのWiFi電波の届く場所で実施してください。
PC接続しない場合、シリアルプリントを残しておくと動作が止まることがあります。

簡単な使い方

M5の電源を入れます。
ESP32S3の電源を入れます。
しばらくしてM5が画像表示すれば成功です。

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