StackChan microSD カード

#include <SPI.h>
#include <SD.h>
#include <M5Unified.h>

#define SD_SPI_CS_PIN    4
#define SD_SPI_SCK_PIN  36
#define SD_SPI_MISO_PIN 35
#define SD_SPI_MOSI_PIN 37

void setup() {
    M5.begin();

    M5.Display.setFont(&fonts::FreeMono12pt7b);
    M5.Display.clear();

    SPI.begin(SD_SPI_SCK_PIN, SD_SPI_MISO_PIN, SD_SPI_MOSI_PIN, SD_SPI_CS_PIN);

    if (!SD.begin(SD_SPI_CS_PIN, SPI, 25000000)) {
        M5.Display.println("SD card not detected");
        while (1);
    } else {
        M5.Display.println("SD card detected");
    }
    delay(1000);

    M5.Display.println("SD card write test...");
    auto file = SD.open("/WriteTest.txt", FILE_WRITE, true);
    if (file) {
        file.print("Hello, world! \nSD card write success! \n");
        file.close();
        M5.Display.println("SD card write success");
    } else {
        M5.Display.println("Failed to create TXT file");
    }
    delay(1000);

    M5.Display.println("SD card read test...");

    if (SD.exists("/cores3_test_picture01.png")) {
        M5.Display.println("PNG file 01 detected");
    } else {
        M5.Display.println("PNG file 01 not detected");
    }

    if (SD.exists("/cores3_test_picture02.png")) {
        M5.Display.println("PNG file 02 detected");
    } else {
        M5.Display.println("PNG file 02 not detected");
    }
    delay(1000);
}

void loop() {
    M5.Display.drawPngFile(SD, "/cores3_test_picture01.png");
    delay(500);
    M5.Display.drawPngFile(SD, "/cores3_test_picture02.png");
    delay(500);
}