/** ds1302.cpp

   2024-08-14
   MPU:stm32f103c8t6
   從DS1302取得日期時間後經由serial port以及SSD1306 Oled顯示
   DS1302接腳 CE(RST):PB15 SCLK:PB13 IO(DAT):PB14 Gnd
   SSD1306接腳 SCK:PB6 SDA:PB7 VCC:3.3v Gnd

   library: https://github.com/Treboada/Ds1302
            stm32duino:Adafruit_SSD1306_STM32.h

*/
//#include <Arduino.h>
#include <SPI.h>
#include <Wire.h>
#include <Ds1302.h>
#define en_oled   //enable OLED SSD1306 on

#ifdef en_oled
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306_STM32.h>   //C:\Users\halin\AppData\Local\Arduino15\packages\stm32duino\hardware\STM32F1\2022.9.26\libraries\Adafruit_SSD1306
                                      //更改128*64 or 128*32 須由上面的路徑中更改Adafruit_SSD1306_STM32.h內定義
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

#define NUMFLAKES 10
#define XPOS 0
#define YPOS 1
#define DELTAY 2
#endif  //endif en_oled  

//#define   en_debug ;      //enable serial out


char kk[10];
String    outstr = "";


// DS1302 RTC instance
Ds1302 rtc(PB15, PB13, PB14);// CE, SCLK, IO
//Ds1302 rtc(PB5, PB3, PB4);// CE, SCLK, IO


const static char* WeekDays[] =
{

  "Monday",
  "Tuesday",
  "Wednesday",
  "Thursday",
  "Friday",
  "Saturday",
  "Sunday"

  /*
      "Mon",
      "Tue",
      "Wed",
      "Thu",
      "Fri",
      "Sat",
      "Sun"
  */
};

uint8_t parseDigits(char* str, uint8_t count)
{
  uint8_t val = 0;
  while (count-- > 0) val = (val * 10) + (*str++ - '0');
  return val;
}


void setup()
{
#ifdef en_debug  
  Serial.begin(9600);
#endif  
  pinMode(PC13, OUTPUT);

  // initialize the RTC
  rtc.init();

#ifdef en_oled
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3D (for the 128x64)
  // Clear the buffer.
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
#endif
  
#ifdef en_debug  
 
// test if clock is halted and set a date-time (see example 2) to start it
      if (rtc.isHalted())
      {
          Serial.println("RTC is halted. Setting time...");

          Ds1302::DateTime dt = {
              .year = 24,
              .month = Ds1302::MONTH_AUG,
              .day = 14,
              .hour = 19,
              .minute = 46,
              .second = 30,
              .dow = Ds1302::DOW_TUE
          };

          rtc.setDateTime(&dt);
      }
#endif      
  
}


void loop()
{
  digitalWrite(PC13, !digitalRead(PC13));
  static char buffer[13];
  static uint8_t char_idx = 0;

  if (char_idx == 13)
  {
    // structure to manage date-time
    Ds1302::DateTime dt;

    dt.year = parseDigits(buffer, 2);
    dt.month = parseDigits(buffer + 2, 2);
    dt.day = parseDigits(buffer + 4, 2);
    dt.dow = parseDigits(buffer + 6, 1);
    dt.hour = parseDigits(buffer + 7, 2);
    dt.minute = parseDigits(buffer + 9, 2);
    dt.second = parseDigits(buffer + 11, 2);

    // set the date and time
    rtc.setDateTime(&dt);

    char_idx = 0;
  }

#ifdef en_debug  

  if (Serial.available())
  {
    buffer[char_idx++] = Serial.read();
  }
  
#endif

  if (char_idx == 0) {
    // get the current time
    Ds1302::DateTime now;
    rtc.getDateTime(&now);

    static uint8_t last_second = 0;
    if (last_second != now.second)
    {
      last_second = now.second;
      outstr = "";
      sprintf(kk, "20%2.2d", now.year);
      outstr = outstr + kk + '-';
      sprintf(kk, "%2.2d", now.month);
      outstr = outstr + kk + '-';
      sprintf(kk, "%2.2d", now.day);
      outstr = outstr + kk;
#ifdef en_debug  
      Serial.print(outstr);
      Serial.print(' ');
      Serial.print(WeekDays[now.dow - 1]);
      Serial.print(' ');
#endif
      
#ifdef en_oled
      display.clearDisplay();
      display.setTextSize(1);     
      display.setCursor(0, 0);
      
      display.println(outstr);
      display.println(WeekDays[now.dow - 1]);
      display.setTextSize(2);
#endif        
      
      outstr = "";
      sprintf(kk, "%2.2d", now.hour);
      outstr = outstr + kk + ':';
      sprintf(kk, "%2.2d", now.minute);
      outstr = outstr + kk + ':';
      sprintf(kk, "%2.2d", now.second);
      outstr = outstr + kk;
#ifdef en_debug  
      Serial.println(outstr);
#endif      
#ifdef en_oled
      display.println(outstr);
      display.display();
#endif
/*      
              Serial.print("20");
              Serial.print(now.year);    // 00-99
              Serial.print('-');
              if (now.month < 10) Serial.print('0');
              Serial.print(now.month);   // 01-12
              Serial.print('-');
              if (now.day < 10) Serial.print('0');
              Serial.print(now.day);     // 01-31
              Serial.print(' ');
              Serial.print(WeekDays[now.dow - 1]); // 1-7
              Serial.print(' ');
              if (now.hour < 10) Serial.print('0');
              Serial.print(now.hour);    // 00-23
              Serial.print(':');
              if (now.minute < 10) Serial.print('0');
              Serial.print(now.minute);  // 00-59
              Serial.print(':');
              if (now.second < 10) Serial.print('0');
              Serial.print(now.second);  // 00-59
              Serial.println();
*/      
    }
  }
  delay(100);
}