//***********************************************************************
//  MPRO1152 - LAB 14.2 - Arduino.2 - DO YOU HAVE A PULSE?
//  
//  Initial: November 15, 2023 - by V Paraunda
//  
//  Program Description: Controlling Pulse Width and Serial Output (with modifications)
//***********************************************************************

// setting up global variables:
int iDuty, iCycle = 0, iInput;
bool bIncrease = true;
//***********************************************************************


//***********************************************************************
void setup() 
{
  //initializing baud rate:
  Serial.begin(115200);

  //initializing pin modes:
  pinMode(11, OUTPUT);      //arduino pin 11 is set as an OUTPUT
  pinMode(13, OUTPUT);      //arduino pin 13 is set as an OUTPUT
  
  digitalWrite(13, LOW);    //led is initially OFF
  
  //Arduino Main Serial Output
  Serial.println("Lab 13 Arduino.1 by V");

  //flashing LED 10 times (indicating start of program): 
  delay(100);
  LED_Flash(9);

  Serial.println("");
  Serial.println("Enter brightness level: 0 (OFF) -> 255 (full ON)");
  Serial.println("");
  Serial.println("'0' -> LED OFF");
  Serial.println("'1' -> setting 1: 50/255");
  Serial.println("'2' -> setting 2: 100/255");
  Serial.println("'3' -> setting 3: 150/255");
  Serial.println("'4' -> setting 4: 200/255");
  Serial.println("'5' -> setting 5: 255/255");


}//end of setup()



//***********************************************************************
void loop() 
{
  delay(50);

  if (Serial.available() > 0)   //checks the serial buffer
  {
    iInput = Serial.read(); // Read the incoming data
    //Serial.println(cChar, DEC);

    Serial.println("");

    switch(iInput)
    {
      case '0': Serial.println("LED OFF"); LED_Var(0); break;
      case '1': Serial.println("20% Duty Cycle"); LED_Var(50); break;
      case '2': Serial.println("40% Duty Cycle"); LED_Var(100); break;
      case '3': Serial.println("60% Duty Cycle"); LED_Var(150); break;
      case '4': Serial.println("80% Duty Cycle"); LED_Var(200); break;
      case '5': Serial.println("100% Duty Cycle"); LED_Var(255); break;

      //check if 'q' is entered
      case 'q':
      {
        Serial.println("Program suspended, press 'r' to restart");

        // Enter an endless loop until 'r' is entered
        while (1) 
        {
          if (Serial.available() > 0)   //checks the serial buffer again
          {
            iInput = Serial.read();
            if (iInput == 'r') 
            {
              Serial.println("Restarting...");
              LED_Var(255);
              break; // Exit the endless loop

            }//end of if('r')

          }//end of if(Serial.available part 2)

        }//end of while(1)
      }//end of case('q')

    }//end of switch()


  } //end of overall if(Serial.available())


}//end of loop()
//***********************************************************************



//***********************************************************************
void LED_Flash (int iFlash)
{

  for(int iFlash2 = 0; iFlash2 <= iFlash; iFlash2++)
  {
    digitalWrite(13, HIGH);
    delay(400);
    digitalWrite(13, LOW);
    delay(500);

  }

}//end of LED_Flash
//***********************************************************************


//***********************************************************************
void LED_Var(int iDCycle)
{
  analogWrite(11,iDCycle);

}//end of LED_var
//***********************************************************************