/*
  Uno with Scope https://github.com/Dlloydev/Wokwi-Chip-Scope
        and https://github.com/Dlloydev/Wokwi-Chip-PWM


  Wokwi Uno https://wokwi.com/projects/390819301187622913
  Wokwi Mega: https://wokwi.com/projects/390819455604080641

*/

/*

  Running Blink.ino
  Turns an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino
  model, check the Technical Specs of your board at:
  https://docs.arduino.cc/hardware/

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

  This example code is in the public domain.

  https://docs.arduino.cc/built-in-examples/basics/Blink/
*/

extern uint32_t timer0_overflow_count;
extern uint32_t timer0_millis;
const byte Trig = 9;
const byte Echo = 7;

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(Trig, OUTPUT);
  Serial.begin(115200);
}

// the loop function runs over and over again forever
void loop() {
  const bool useMicros = true;
  uint32_t t0, t1, t2;

  digitalWrite(Trig, HIGH); digitalWrite(Trig, LOW);

  t0 = useMicros? micros() : timer0count();
  while (digitalRead(Echo) != HIGH);
  t1 = useMicros? micros() : timer0count();
  while (digitalRead(Echo) != LOW);
  t2 = useMicros? micros() : timer0count();

  Serial.print(" count:");
  Serial.print( t0);
  Serial.print(" PauseDuration:");
  Serial.print(t1 - t0);
  Serial.print(" PulseDuration:");
  Serial.print(t2 - t1);
  Serial.print(" OverallDuration:");
  Serial.print(t2 - t0);
  Serial.println();
  //Serial.println(pulseIn(7,HIGH));
  delay(1000);

}


uint32_t timer0count(void) {
  uint32_t count;
  cli();
  uint8_t reg = TCNT0;
  count = (uint16_t)timer0_overflow_count;
  sei();

  //  count = micros() ;//| 0*reg;
  count = count << 8 | reg;
  return count;
}