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ESP32 ESP-IDF GPIO按键中断响应

2022-07-01 06:30:00 【晨之清风】

陈拓 2022/06/19-2022/06/19

1. 概述

此示例显示了如何配置GPIO以及如何在中断时使用它。
引脚功能

开发板上只有一个按键接在GPIO0。该引脚在烧固件时需要拉低，程序运行时作为普通按钮输入。

官方例程国内镜像

https://gitee.com/EspressifSystems/esp-idf/tree/master/examples/peripherals/gpio/generic_gpio

2. 开发环境

《用乐鑫国内Gitee镜像搭建ESP32开发环境》

https://zhuanlan.zhihu.com/p/348106034

https://blog.csdn.net/chentuo2000/article/details/113424934?spm=1001.2014.3001.5501

3. 修改代码

因为我们只有一个按键接在PGIO0上，修改代码用中断方式捕捉按键按下和松开，对应下降沿和上升沿中断。

gpio_example_main.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "driver/gpio.h"

/**
 * Brief:
 * This test code shows how to configure gpio and how to use gpio interrupt.
 *
 * GPIO0:  input, pulled up, interrupt from rising edge and falling edge
 *
 */

#define GPIO_INPUT_IO_0     0
#define GPIO_INPUT_PIN_SEL  1ULL<<GPIO_INPUT_IO_0
#define ESP_INTR_FLAG_DEFAULT 0

static xQueueHandle gpio_evt_queue = NULL;

static void IRAM_ATTR gpio_isr_handler(void* arg)
{
    uint32_t gpio_num = (uint32_t) arg;
    xQueueSendFromISR(gpio_evt_queue, &gpio_num, NULL);
}

static void gpio_task_example(void* arg)
{
    uint32_t io_num;
    for(;;) {
        if(xQueueReceive(gpio_evt_queue, &io_num, portMAX_DELAY)) {
            printf("GPIO[%d] intr, val: %d\n", io_num, gpio_get_level(io_num));
        }
    }
}

void app_main(void)
{
    gpio_config_t io_conf = {}; //zero-initialize the config structure.
    //io_conf.intr_type = GPIO_INTR_POSEDGE; // 上升沿产生中断
    io_conf.intr_type = GPIO_INTR_ANYEDGE; // 上升、下降沿都产生中断
    io_conf.pin_bit_mask = GPIO_INPUT_PIN_SEL; //bit mask of the pins, use GPIO0 here
    io_conf.mode = GPIO_MODE_INPUT; //set as input mode
    io_conf.pull_up_en = 1; //enable pull-up mode
    gpio_config(&io_conf);

    //create a queue to handle gpio event from isr
    gpio_evt_queue = xQueueCreate(10, sizeof(uint32_t));
    //start gpio task
    xTaskCreate(gpio_task_example, "gpio_task_example", 2048, NULL, 10, NULL);

    //install gpio isr service
    gpio_install_isr_service(ESP_INTR_FLAG_DEFAULT);
    //hook isr handler for specific gpio pin
    gpio_isr_handler_add(GPIO_INPUT_IO_0, gpio_isr_handler, (void*) GPIO_INPUT_IO_0);

    printf("Minimum free heap size: %d bytes\n", esp_get_minimum_free_heap_size());
}