//Listing 6.3 Interrupts example
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "esp_log.h"

void IRAM_ATTR button_isr_handler(void* arg);

#define BUTTON_PIN 4  // Button connected to GPIO4

void app_main() {
    // Configuring GPIO as input
    gpio_set_direction(BUTTON_PIN, GPIO_MODE_INPUT);
    gpio_set_pull_mode(BUTTON_PIN, GPIO_PULLUP_ONLY);

    // Setting interrupt on FALLING edge (button press)
    gpio_set_intr_type(BUTTON_PIN, GPIO_INTR_NEGEDGE);

    // Install ISR service (interrupt handling)
    gpio_install_isr_service(0);

    // Attaching ISR handler to BUTTON_PIN
    gpio_isr_handler_add(BUTTON_PIN, button_isr_handler, NULL);

    while (1) {
        printf("Main loop running...\n");
        vTaskDelay(pdMS_TO_TICKS(500));  // loop continues running
    }
}

// Interrupt Service Routine (ISR)
void IRAM_ATTR button_isr_handler(void* arg) {
    printf("Interrupt: Button Pressed!\n");
}