#include "U8glib.h"
#include "SdFat.h"

#define SPI_SPEED SD_SCK_MHZ(4)
#define CS_PIN 10

SdFat sd;

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_DEV_0 | U8G_I2C_OPT_NO_ACK | U8G_I2C_OPT_FAST); // Fast I2C / TWI

int progress = 0;

void setup() {
  Serial.begin(115200);
  if (!sd.begin(CS_PIN, SPI_SPEED)) {
    if (sd.card()->errorCode()) {
      Serial.println("SD initialization failed.");
    } else if (sd.vol()->fatType() == 0) {
      Serial.println("Can't find a valid FAT16/FAT32 partition.");
    } else {
      Serial.println("Can't determine error type");
    }
    return;
  }

  Serial.println("Files on card:");
  Serial.println("   Size    Name");

  sd.ls(LS_R | LS_SIZE);
  u8g.setFont(u8g_font_tpssb);
  u8g.setColorIndex(1);
}

void loop() {
  u8g.firstPage();
  do {
    u8g.drawStr(40, 50, "Loading");
    u8g.drawFrame(0, 10, 128, 20);
    u8g.drawBox(10, 15, progress, 10);
  } while ( u8g.nextPage() );

  if (progress < 108) {
    progress++;
  } else {
    u8g.firstPage();
  }
}