#include <Arduino.h>

const int pulsePin = 8; // Arduino pin 8 for the pulse output

#include <Arduino.h>

void delay_100_micro() {
  // 1 ms delay function using inline assembly
  asm volatile (
    "ldi r20, 198\n"
    "L1: dec r20\n"
    "nop\n" 
    "nop\n"
    "nop\n"
    "nop\n"
    "nop\n"
    "brne L1\n"
  );

}


void delay_micro(float micro_s) {
  int c = (int)(micro_s / 100);
  for (uint16_t i = 0; i < (micro_s / 100); i++) {
    delay_100_micro();
  }
}

void setup() {
  Serial.begin(9600);             // Initialize serial communication
  pinMode(pulsePin, OUTPUT);      // Set pulsePin as output
  Serial.println("Enter high time in milliseconds (1 to 2 ms):");
}

void loop() {
  while (Serial.available() == 0) {
    delay(10);                    // Wait for serial input
  }

  float highTime = Serial.parseFloat(); // Read float value from serial input
  Serial.read();                       // Clear the newline character from serial buffer

  // Check if the value is within the valid range (1 to 2 ms)
  if (highTime < 1.0 || highTime > 2.0) {
    Serial.println("Invalid input. Please enter a value between 1 and 2 milliseconds.");
    return;
  }

  // Calculate low time
  float lowTime = 20.0 - highTime;

  unsigned long t1 = micros();
  delay_100_micro();
  unsigned long t2 = micros();
  Serial.print("Time taken by the task: ");
  Serial.print(t2 - t1);
  Serial.println(" microseconds");

  // Generate the pulse
  for (int i = 0; i < 20; i++) {
    digitalWrite(pulsePin, HIGH);      // Set pulsePin high
    delay_micro(highTime * 1000);      // Delay for the high time
    digitalWrite(pulsePin, LOW);       // Set pulsePin low
    delay_micro(lowTime * 1000);       // Delay for the low time
  }
}