#include "pico/stdlib.h"
#include <math.h>

const uint ledPins[] = {0, 1, 2, 3};
const uint buttonPin = 15;
const int led_count = sizeof(ledPins) / sizeof(int);
const uint TSLEEP = 250;
volatile uint8_t counter = 0;
bool state = 0;

int main() {
  gpio_init(buttonPin);
  gpio_set_dir(buttonPin, GPIO_IN);
  gpio_pull_up(buttonPin);

  for (int i = 0; i < led_count; i++) {
    gpio_init(ledPins[i]);
    gpio_set_dir(ledPins[i], GPIO_OUT);
  }

  while (true) {
    while (gpio_get(buttonPin) == 0) {
      if (state = 1){
        counter=1;
        state = 0;
      }
      counter++;
      sleep_ms(TSLEEP);
      if (counter > 15) {
        counter = 1;
      }
      for (int i = 0; i < led_count; i++) {
        gpio_put(ledPins[i], 0);
      }
    }
    
  state=1;

    for (int i = 0; i < led_count; i++) {
      gpio_put(ledPins[i], (counter >> i) & 0x01); //logisches und vergleich mit 0001
    } // counter=13(1101); 1101 >> 0, = 1101 & 0001 = 0001; 1101 >> 1, x110 & 0001 = 0001; 1101 >> 2, xx11 & 0001 = 0001; 1101 >> 3, xxx1 & 0001 = 0001
  }   // insgesamte Ausgabe = On On Off On
}

//für meine klasse