LovyanGFX + ESP-IDFでSDカードをマウントしてdrawJpgFileを使うサンプル

LGFX_drawJpgFile_with_ESPIDF.cpp

/// long filename を扱う場合は menuconfig で Component config -> FAT Filesystem support -> Long filename support を有効にすること

#include <esp_vfs_fat.h>

#define LGFX_AUTODETECT
#include <LovyanGFX.hpp>

LGFX lcd;

void setup(void)
{
  lcd.init();

  sdspi_device_config_t device_config = SDSPI_DEVICE_CONFIG_DEFAULT();
  device_config.host_id = VSPI_HOST;
  device_config.gpio_cs = (gpio_num_t)4;  // SDカードのCSピンの番号を指定

  sdmmc_host_t host = SDSPI_HOST_DEFAULT();
  host.slot = device_config.host_id;

  esp_vfs_fat_mount_config_t mount_config = {
      .format_if_mount_failed = false,
      .max_files = 5,
      .allocation_unit_size = 16 * 1024
  };

  sdmmc_card_t* card;
  esp_err_t res = esp_vfs_fat_sdspi_mount("/sdcard", &host, &device_config, &mount_config, &card);

  lcd.drawJpgFile("/sdcard/m5stack.jpg", 0, 0);
}

void loop(void)
{
  taskYIELD();
}

#if !defined ( ARDUINO )
extern "C" {
  void loopTask(void*)
  {
    setup();
    for (;;) {
      loop();
    }
    vTaskDelete(NULL);
  }

  void app_main()
  {
    xTaskCreatePinnedToCore(loopTask, "loopTask", 8192, NULL, 1, NULL, 1);
  }
}
#endif