#include "LiquidCrystal_I2C.h"
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

#define LED_PIN 13
#define POT_DUTY A0
#define POT_PERIOD A1
#define SDA_PIN A5.2
#define SLC_PIN A4.2
#define BUTTON_DISRUPT 2

int period = 100;
int pWidth = 0;
int nWidth = 0;
int potDutyVal = 0;
int  potPeriod = 0;
byte glitchTime = 10;

bool state = HIGH;

//********************************************************************
void setup() {
Serial.begin(9600);
pinMode(LED_PIN, OUTPUT);
pinMode(BUTTON_DISRUPT, INPUT_PULLUP);

attachInterrupt(digitalPinToInterrupt(BUTTON_DISRUPT), disrupt, CHANGE);

LCD.init();
LCD.backlight();
}

//********************************************************************
void loop() {

potPeriod = analogRead(POT_PERIOD); // 0 to 1023
period = map(potPeriod,0,1023,0,500); //val,  fl, fH ,tL,TH nWidth  

potDutyVal = analogRead(POT_DUTY); // 0 to 1023
pWidth = map(potDutyVal,0,1023,0,period); //val,  fl, fH ,tL,TH nWidth

nWidth = period - pWidth;


String out = String(period) + " " + String(pWidth) + " " + String (nWidth);
String out2 = String(period) + " " + String(1.0 / float(period / 1000.0)) + " " + String(float(pWidth)/float(period) * 100);
serialOut(out);
lcdOut(out2);
pulseOut();
}


void pulseOut(){
  digitalWrite(LED_PIN, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(pWidth);                      // wait for a second
  digitalWrite(LED_PIN, LOW);   // turn the LED off by making the voltage LOW
  delay(nWidth);                      // wait for a second
}

void disrupt() {

  serialOut("sfgsfdgsdfgsdfg");
  digitalWrite(LED_PIN, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(glitchTime);                      // wait for a second
  digitalWrite(LED_PIN, LOW);   // turn the LED off by making the voltage LOW
  delay(glitchTime);     
}

void serialOut(String out){
  Serial.println(out);
}

void lcdOut(String out){
  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("PER  FRQ     +");
  LCD.setCursor(0, 1);
  LCD.print(out);
}