/**
   Copyright (c) 2020 Raspberry Pi (Trading) Ltd.

   SPDX-License-Identifier: BSD-3-Clause
*/

#include "pico/stdlib.h"

const uint ledPins[] = {13, 9, 6, 2};
const int led_count = sizeof(ledPins) / sizeof(int);


int main() {

  const uint buttonPin = 27;
  const uint TSLEEP = 500;
  volatile uint8_t counter = 0;

//initialisierung button
  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) {
      counter++;
      sleep_ms(TSLEEP);
      if (counter > 15) {
        counter = 0;
      }

      for (int i = 0; i < led_count; ++i) {
        gpio_put(ledPins[i], 0);
      }
    }
    for (int i = 0; i < led_count; ++i) {
      gpio_put(ledPins[i], (counter >> i) & 0x01);
    }

  }

}