ESP-IDF tutorial series: GPIO get started - Part 2 · Developer Portal

[giscus[bot]]

ESP-IDF tutorial series: GPIO get started - Part 2 · Developer Portal

In this article, we explore how to configure GPIO pins as inputs in ESP-IDF and discuss the importance of pull-up/pull-down resistors. We will try two approaches for reading GPIO values: polling and event-driven interrupts, showing how to implement each method effectively.

https://developer.espressif.com/blog/2026/02/esp-idf-tutorial-gpio-get-started-2/

[bertielicious]

gpio_install_isr_service(ESP_INTR_FLAG_DEFAULT); causes an error in ESP-IDF 5.5.2, use instead gpio_install_isr_service(0);

[bertielicious]

#include "esp_log.h"
#include "driver/gpio.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"

#define BUTTON_GPIO 18
static const char *TAG = "BUTTON_INTERRUPT";

static void IRAM_ATTR button_isr_handler(void *arg)
{
ESP_DRAM_LOGI(TAG, "Button pressed");
}

void app_main(void)
{

gpio_set_direction(BUTTON_GPIO, GPIO_MODE_INPUT); 
gpio_set_pull_mode(BUTTON_GPIO, GPIO_PULLUP_ONLY);   
gpio_set_intr_type(BUTTON_GPIO, GPIO_INTR_NEGEDGE);  
gpio_install_isr_service(0);         
gpio_isr_handler_add(BUTTON_GPIO, button_isr_handler, NULL);
while(1)
{
    vTaskDelay(pdMS_TO_TICKS(1000)); 
}

}