// The file can be found completely as a common cathode using simulation
// The link is https://wokwi.com/projects/381842732654213121

uint8_t seven_seg_ports[] = {6, 7, 8, 9, 10, 11, 12, 13}; //global array for ports of the 7-segment display
uint8_t seven_seg_digits_port[] = {PA0, PA1, PA12, PA13};
void displayNumber(uint16_t value_to_display, uint8_t digits[]);
void displayDigit(int digit, int value);
int32_t ntp_temp();
int32_t preset();
int32_t previousset=27;
int16_t startviewtime = 25;
uint8_t seven_seg_advertisement[10] = //Bit pattern for 7 - segment display (7 segment coding of the decimal digits)
{
  0b11111100, //0
  0b01100000, //1
  0b11011010, //2
  0b11110010, //3
  0b01100110, //4
  0b10110110, //5
  0b10111110, //6
  0b11100000, //7
  0b11111110, //8
  0b11110110  //9
}; //End bit pattern - array

uint8_t seven_seg_digits_advertisement[4] = 
{
  0b1110,//DGT1
  0b1101,//DGT2
  0b1011,//DGT3
  0b0111 //DGT4
  };//Bit pattern for 4 - digit display (4 digit coding of the decimal digits
 //End bit pattern - array

uint16_t digits_value = 0; //digits_valueing variable to digits_value the bit patterns
uint8_t digit_pos = 0;//digit_position variable to digit_pos the bit patterns
void setup()
{
  //Initialization of ports D13-->DP, D12-->Segment g,... to D6-->Segment a
  
  for (uint16_t i = 0; i <= 7; i++)
  {
    pinMode(seven_seg_ports[i], OUTPUT);
  }
  
  for (uint16_t i = 0; i <= 3; i++)
  {
    pinMode(seven_seg_digits_port[i], OUTPUT);
  }
  pinMode(A0, INPUT);
  pinMode(A1, INPUT);
  clear7_seg(3);
  Serial.begin(115200);
  Serial.println("Hello, 7 Segment Display");
}

void loop()
{
  int32_t celsius = ntp_temp();
  int32_t celsiusset = preset();
  if ((celsiusset != previousset) && (startviewtime > 0))
  {
    //delay(startviewtime);

    startviewtime--;
    celsius = celsiusset;
    if (startviewtime <= 0 )
    {
      previousset = celsiusset;
    }
  }
  else
    {     
      int32_t celsius = preset();
      startviewtime = 25;
    }
  
  int32_t digits_value = celsius;//1235;//digits_valueing variable to digits_value the bit patterns
  uint16_t pos = 3;
  //Output of the digit on a 7 segment display
  uint8_t digits[4] = {0, 0, 0, 0};
  
    displayNumber(digits_value, digits);
    
    int val=3;
    while (val >= 0) //when the last digit reaches 0 start again
    { 
    //Serial.print("current pos: ");
    //Serial.println(pos, DEC);

    write7_seg(seven_seg_advertisement[digits [val]], seven_seg_digits_advertisement[pos]);
    val--;

     delay(1);
     if(pos > 0) //when the last digit reaches 0 start again
    {
      pos--;
    }
    else
    {
      pos=3;
    }// End 
    }// End if
   
    //delay(1); // this speeds up the simulation
    //Serial.print("------- next digit --------\n");  
  }

void write7_seg(uint16_t advertisement_var, uint16_t digit_var) //Function for writing to 7Seg display
{
  clear7_seg(advertisement_var);
  for (int8_t i = 0; i >= 0;i++)
  {
  digitalWrite(seven_seg_digits_port[i], bitRead(digit_var, i));
  }//End for
 
  delay(1);
  
  for (int16_t j = 7; j >= 0; j--)
  {
    delay(1);
    //outputs the current port pin that is being written...and with what value
    //Writes the value to the corresponding port pin for display on the 7 segment display
    digitalWrite(seven_seg_ports[j], bitRead(advertisement_var, 7 - j));    
  }//End for
}//End wirte7_seg

void displayNumber(uint16_t value_to_display, uint8_t digits[])
{
  digits [0] = value_to_display / 1000;
  digits [1] = (value_to_display / 100) % 10;
  digits [2] = (value_to_display / 10) % 10;
  digits [3] = value_to_display % 10;
}

void clear7_seg(uint16_t advertisement_var) //Function for writing to 7Seg display
{
  for (int16_t j = 7; j >= 0; j--)
  {
    //Initialization of ports PA for display digit ----> DIG1...DIG4
    digitalWrite(seven_seg_digits_port[0], HIGH);
    digitalWrite(seven_seg_digits_port[1], HIGH);
    digitalWrite(seven_seg_digits_port[2], HIGH);
    digitalWrite(seven_seg_digits_port[3], HIGH);
   
    //Writes the value to the corresponding port pin for display on the 7 segment display
    digitalWrite(seven_seg_ports[j], bitRead(advertisement_var, 7 - j));
    delay(1);
  }//End for

}//End clear7_seg
  int32_t ntp_temp()
  {
  const int64_t BETA = 3950;
  int32_t analogValue = analogRead(A0);
  int32_t celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  //int32_t celsius = (analogValue * 10)/BETA;
  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println(" ℃");
  delay(1);
  return (celsius);
  }
 
  int32_t preset()
  {
  const int32_t RES = 3.95;
  int32_t analogValue = analogRead(A1);
  int32_t celsius = 1 / (log(1 / (1023. / analogValue - 1)) /  + 1.0 / 2.9815) - 2.7315;
  //int32_t celsius = (analogValue * 10)/RES;
  Serial.print("Preset: ");
  Serial.print(celsius);
  Serial.println(" ℃");
  delay(1);
  return (celsius);
  }