sketch_feb6b.ino

#include <Arduino.h>

#include "pico/sync.h"

struct repeating_timer timer;

const int us_interval = 1000 * 1000 * 1;

volatile bool ready_for_phase_2 = false;
volatile bool phase_2_started = false;


bool handlerISR(repeating_timer *timer)
{
    static int counter = 0;
    Serial.println("handlerISR called!");
    counter++;
    if (counter<10)
      return true;

    ready_for_phase_2 = true;

    if (phase_2_started) return true;

    return false;

}

void setup() {
  // put your setup code here, to run once:

  /*for (int i = 0 ; i < 5 ; i++) {
    Serial.println("starting up...");
    delay(1000);
  }*/

  add_repeating_timer_us(-us_interval, &handlerISR, NULL, &timer);
}


void loop() {
  // put your main code here, to run repeatedly:

  if (ready_for_phase_2 && !phase_2_started) {
    phase_2_started = true;
    Serial.println("setting up new negative timer...!");

    cancel_repeating_timer(&timer);
    add_repeating_timer_us(-us_interval, &handlerISR, NULL, &timer);
  }
}