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

File root;

#define SPI_MISO  MISO
#define SPI_MOSI  MOSI
#define SPI_SCK    SCK
#define SPI_SD_SS   A3

SPIClass SDSPI(HSPI);

void setup() {

	Serial1.begin(115200);

	Serial1.println("Initializing SD card...");

	SDSPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI, -1);
	pinMode(SPI_SD_SS, OUTPUT);

	while(!SD.begin(SPI_SD_SS, SDSPI)) {
		Serial1.println("initialization failed!");
		delay(1000);
	}
	Serial1.println("initialization done.");

	root = SD.open("/");
	printDirectory(root, 0);

	Serial1.println("done!");
}

void loop() {}

void printDirectory(File dir, int numTabs) {
	// Begin at the start of the directory
	dir.rewindDirectory();

	while(true) {
		File entry =  dir.openNextFile();
		if (! entry) break; // no more files
		for (uint8_t i=0; i<numTabs; i++) {
			Serial1.print('\t');   // we'll have a nice indentation
		}
		Serial1.print(entry.name());
		// Recurse for directories, otherwise print the file size
		if (entry.isDirectory()) {
			Serial1.println("/");
			printDirectory(entry, numTabs+1);
		} else {
			// files have sizes, directories do not
			Serial1.print("\t\t");
			Serial1.println(entry.size(), DEC);
		}
		entry.close();
	}
}

#include <SPI.h>
#include <WiFi.h>
#include <time.h>
#include "RTClib.h"

#define TIMEZONE_JST (3600 * 9) // 日本標準時：UTC(世界標準時)より９時間早い
#define DAYLIGHTOFFSET_JST (0)  // サマータイムなし

const char* ntp_server1 = "ntp.nict.jp";
const char* ntp_server2 = "pool.ntp.org";

static char *ssid[] = {"xxxxxxxx","xxxxxxxx"};
static char *password[] = {"xxxxxxxx","xxxxxxxx"};
int  wifi_cnt = 2;
static time_t t = 0;

RTC_PCF8523 rtc;
char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thr", "Fri", "Sat"};

void get_ntp(int num) {

	int cnt = 0;

	WiFi.begin(ssid[num], password[num]);
	while (WiFi.status() != WL_CONNECTED) {
		if ((++cnt)==20) return;
		delay(500);
	}

	configTime(TIMEZONE_JST, DAYLIGHTOFFSET_JST, ntp_server1, ntp_server2);

	for (cnt=0;cnt<10;++cnt) {
		t = time(NULL);
		if (t>TIMEZONE_JST) break;
		delay(500);
	}
	WiFi.disconnect();
}

void setup () {

	Serial1.begin(115200);

	if (! rtc.begin()) {
		Serial1.println("Couldn't find RTC");
		Serial1.flush();
		while (1) delay(10);
	}

	for (int i=0;i<wifi_cnt;++i) {
		get_ntp(i);
		if (t>TIMEZONE_JST) {
			struct tm* tm = localtime(&t);
			rtc.adjust(DateTime(tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec));
			break;
		}
	}

	rtc.start();
}

void loop () {

	DateTime now = rtc.now();
	Serial1.printf("%04d/%02d/%02d(%s)%02d:%02d:%02d\n",
		now.year(),
		now.month(),
		now.day(),
		daysOfTheWeek[now.dayOfTheWeek()],
		now.hour(),
		now.minute(),
		now.second());

	delay(3000);
}