ESP32 Forum

Code: Select all

/* Hello World Example

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "driver/gpio.h"
#include "esp_log.h"
#include "sdkconfig.h"

#define BLINK_GPIO_GREEN 25
#define BUTTON GPIO_NUM_12
#define ESP_INTR_FLAG_DEFAULT 0

 int BUTTON_PRESSED;

void blink_task(void *pvParameter)
{
    while (1)
    { 
        vTaskDelay(1000 / portTICK_PERIOD_MS);
        BUTTON_PRESSED = gpio_get_level(BUTTON);
        ESP_LOGI("test", "BUTTON STATE : %d", BUTTON_PRESSED);
        gpio_set_level(BLINK_GPIO_GREEN, BUTTON_PRESSED);
    }
}


static void IRAM_ATTR gpio_isr_handler()
{
    BUTTON_PRESSED = gpio_get_level(BUTTON);
    ets_printf("Button state : %d\n", BUTTON_PRESSED);
}

void app_main()
{
   
    gpio_pad_select_gpio(BLINK_GPIO_GREEN);
    gpio_set_direction(BLINK_GPIO_GREEN, GPIO_MODE_OUTPUT);

    gpio_config_t btn_config;
    btn_config.intr_type = GPIO_INTR_ANYEDGE ;
    btn_config.mode = GPIO_MODE_INPUT;               //Set as Input
    btn_config.pin_bit_mask = (1ULL << BUTTON); //Bitmask
    btn_config.pull_up_en = GPIO_PULLUP_DISABLE;     //Disable pullup
    btn_config.pull_down_en = GPIO_PULLDOWN_ENABLE; //Enable pulldown
    gpio_config(&btn_config);
    BUTTON_PRESSED = gpio_get_level(BUTTON);
    //install gpio isr service
    gpio_install_isr_service(ESP_INTR_FLAG_DEFAULT);

    //hook isr handler for specific gpio pin
    gpio_isr_handler_add(BUTTON, gpio_isr_handler, NULL);
    
    xTaskCreate(&blink_task, "blink_task", 1024*4, NULL, 1, NULL);
}