#include <Arduino.h>

static inline uint32_t getCycleCount() {
  uint32_t ccount;
  asm volatile ("rsr.ccount %0" : "=a"(ccount));
  return ccount;
}

void setup() {
   // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello ");
}
uint32_t l1, l2, cycles;
void loop() {
  int freq = getCpuFrequencyMhz();
  l1 = getCycleCount();
  //asm volatile ("rsr.ccount %0" : "=a"(l1));
  delay(10);
  //asm volatile ("rsr.ccount %0" : "=a"(l2));
  l2 = getCycleCount();

  cycles = l2 - l1;
  double us = (double)cycles / (double)freq; 
  Serial.println(cycles);
  delay(1000);
}