1 前言

尝试使用按键控制led灯亮灭。

2 硬件

led
在这里插入图片描述
key

按键0

在这里插入图片描述

3 代码

/* 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 <stdio.h>
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "esp_spi_flash.h"
#include "driver/gpio.h"

#define GPIO_LED4 38	//指定IO口
#define GPIO_LED5 39	//指定IO口

#define GPIO_KEY1 0

void init_key(void)
{
    gpio_pad_select_gpio(GPIO_KEY1);	//指定IO口
    gpio_set_direction(GPIO_KEY1,GPIO_MODE_INPUT);
}

int get_key_value(void)
{
    int a = gpio_get_level(GPIO_KEY1);
    printf("key1 gpio07 value:%d\n",a);
    return a;
}

void init_led(void)
{
    gpio_pad_select_gpio(GPIO_LED4);	//指定IO口
	gpio_set_direction(GPIO_LED4,GPIO_MODE_OUTPUT);
    gpio_pad_select_gpio(GPIO_LED5);	//指定IO口
	gpio_set_direction(GPIO_LED5,GPIO_MODE_OUTPUT);

    gpio_set_level(GPIO_LED4, 0);
    gpio_set_level(GPIO_LED5, 0);
}

void hello_world()
{
    printf("Hello world!\n");

    /* Print chip information */
    esp_chip_info_t chip_info;
    esp_chip_info(&chip_info);
    printf("This is %s chip with %d CPU core(s), WiFi%s%s, ",
            CONFIG_IDF_TARGET,
            chip_info.cores,
            (chip_info.features & CHIP_FEATURE_BT) ? "/BT" : "",
            (chip_info.features & CHIP_FEATURE_BLE) ? "/BLE" : "");

    printf("silicon revision %d, ", chip_info.revision);

    printf("%dMB %s flash\n", spi_flash_get_chip_size() / (1024 * 1024),
            (chip_info.features & CHIP_FEATURE_EMB_FLASH) ? "embedded" : "external");

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

    for (int i = 10; i >= 0; i--) {
        printf("Restarting in %d seconds...\n", i);
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
    printf("Restarting now.\n");
    fflush(stdout);
    esp_restart();

}

void test_led()
{
	printf("Turning off the LED\n");
        gpio_set_level(GPIO_LED4, 0);	//低电平输出
        gpio_set_level(GPIO_LED5, 1);
        vTaskDelay(1000 / portTICK_PERIOD_MS);	//延时1s
	printf("Turning on the LED\n");
        gpio_set_level(GPIO_LED4, 1);	//高电平输出
        gpio_set_level(GPIO_LED5, 0);
        vTaskDelay(1000 / portTICK_PERIOD_MS);
}

void app_main(void)
{
    init_led();
    init_key();

    int temp = 0;
    int status_led =0;

    while(1) {    
        // test_led()

        temp = get_key_value();
        if (temp == 0)
        {
            printf("temp is 0\n");
            gpio_set_level(GPIO_LED4, status_led);

            status_led = 1 - status_led;
            // vTaskDelay(1000 / portTICK_PERIOD_MS);
        }
        else
        {
            printf("temp is 1\n");
            // gpio_set_level(GPIO_LED4, 1);
            // vTaskDelay(1000 / portTICK_PERIOD_MS);
        }
        // 延时
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
}