#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "stddef.h"

#define GPIO_LED 21
#define GPIO_LED_PIN_SEL (1ULL<<GPIO_LED)
#define GPIO_BUTTON 1
#define GPIO_BUTTON_PIN_SEL (1ULL<<GPIO_BUTTON)
#define ESP_INTR_FLAG_DEFAULT 0

static void button_handler(void *arg);
static void init_hw(void)

{
  gpio_config_t io_conf;
  io_conf.mode = GPIO_MODE_OUTPUT;
  io_conf.pin_bit_mask = GPIO_LED_PIN_SEL;
  io_conf.intr_type = GPIO_INTR_DISABLE;
  io_conf.pull_down_en=0;
  io_conf.pull_up_en=0;
  gpio_config(&io_conf);
  io_conf.mode = GPIO_MODE_INPUT;
  io_conf.pin_bit_mask = GPIO_BUTTON_PIN_SEL;
  io_conf.intr_type = GPIO_INTR_NEGEDGE;
  io_conf.pull_down_en=0;
  io_conf.pull_up_en=1;
  gpio_config(&io_conf);
  gpio_install_isr_service(ESP_INTR_FLAG_DEFAULT);
  gpio_isr_handler_add(GPIO_BUTTON,button_handler,NULL);


}

static TickType_t next = 0 ;
static bool led_state = false;
static void IRAM_ATTR button_handler(void *arg)

{
 TickType_t now = xTaskGetTickCountFromISR();
 if (now > next)
 {
  led_state = !led_state;
  gpio_set_level (GPIO_LED, led_state);
  next = now +500/ portTICK_PERIOD_MS ;
 }


}


void app_main() {
  printf("Hello, Wokwi!\n");
  init_hw();
  vTaskSuspend(NULL);
 
  }