//MAX7219_RTC時鐘
#include <MD_Parola.h>    //利用Parola 滾動文字
#include <MD_MAX72xx.h>   //點矩陣
#include <SPI.h>         //SPI_DIN=23,CLK=18
#include "RTClib.h"      //RTC

//依硬體型態來選擇函式庫：3選1
//#define HARDWARE_TYPE MD_MAX72XX::FC16_HW  //for 一般
//#define HARDWARE_TYPE MD_MAX72XX::GENERIC_HW
#define HARDWARE_TYPE MD_MAX72XX::PAROLA_HW  //for wokwi
#define MAX_DEVICES 4   //使用4個MAX7219
#define CS_PIN 5       //CS接腳
//初始化
MD_Parola   p=MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);

RTC_DS1307 rtc;        //物件名稱rtc
char day_week[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", 
                         "Thursday", "Friday", "Saturday"};
void setup() {
  Serial.begin(115200);
  p.begin();          //啟動Parola
  if (! rtc.begin()) { //RTC啟動
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }           
}

void loop() {   
  DateTime now = rtc.now();     //取得現在時間now 
  int dayofweek = now.dayOfTheWeek();//取得星期名稱
  int hh=now.hour();            //取得小時
  int mm=now.minute();          //取得分鐘
  int ss=now.second();          //取得秒鐘
   //顯示時分秒,dayofweek
  Serial.println(String(hh)+":"+String(mm)+":"+String(ss)+" "+
                                         day_week[dayofweek]);

  String AmPm="A";  
  if (hh<12) AmPm="A";
  else AmPm="P"; //AM PM判斷

  String strhh=String(hh);          //分鐘轉字串
  if(strhh.length()==1) strhh +="0";//如果個位數，前補0
  String strmm=String(mm);          //分鐘轉字串
  if(strmm.length()==1) strmm +="0";//如果個位數，前補0
  String strss=String(ss);          //秒數轉字串
  if(strss.length()==1) strss +="0";//如果個位數，前補0

  p.setTextAlignment(PA_LEFT);      //置左對齊
  if(ss%2==0) p.print(AmPm + strmm+ ":" +strss); //偶數秒顯示冒號:
  else p.print(AmPm + strmm +" " +strss);        //奇數秒空白
   
  delay(1000);
}