使用ESP-IDF写一个ESP32检测按键输入的程序
时间: 2024-11-27 17:17:44 浏览: 99
在使用ESP-IDF(Espressif IoT Development Framework)编写ESP32的按键输入检测程序时,首先你需要安装并配置好ESP-IDF环境。这里是一个基础示例,展示如何创建一个简单的程序来读取GPIO按键的输入:
```c
#include "esp_system.h"
#include "driver/gpio.h"
// 定义按键连接的GPIO引脚
#define GPIO_KEY_PIN_NUM 0 // 根据实际硬件连接替换
static esp_event_loop_tag_t event_tag = NULL;
static bool key_pressed = false;
void app_main()
{
// 初始化ESP系统
esp_err_t err = esp系 统 init();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to initialize ESP system.");
return;
}
// 配置按键GPIO为输入模式
gpio_config_t io_conf = {0};
io_conf.pin_num = GPIO_KEY_PIN_NUM;
io_conf.mode = GPIO_MODE_INPUT_PULLUP; // 设置为上拉模式
io_conf.pull_up_down = GPIO_PULLUP_ENABLE;
if (gpio_init(&io_conf) == -1) {
ESP_LOGE(TAG, "Failed to configure button GPIO.");
return;
}
// 注册按键事件回调
event_tag = esp_event_loop_create_default();
ESP_ERROR_CHECK(esp_intr_alloc(
ESP_INTR_FLAG_IRAM, // 如果在中断上下文中运行,需要IRAM支持
ESP_INT_GPIO_HW, // 指定为GPIO中断
gpio_isr_handler, // 中断处理函数
ESP_INTR_LEVEL_RISING, // 干扰水平,当GPIO上升沿触发时调用
&GPIO_KEY_PIN_NUM, // GPIO引脚
NULL)); // 用户指针
while (true)
{
esp_event_handle_once(event_tag, portMAX_DELAY);
if (key_pressed) {
ESP_LOGI(TAG, "Button pressed");
key_pressed = false; // 清除状态
}
}
}
// GPIO中断处理函数
void gpio_isr_handler(void *arg)
{
uint32_t gpio_num = *(uint32_t *)arg;
if (gpio_num == GPIO_KEY_PIN_NUM && !gpio_get_level(gpio_num)) {
key_pressed = true; // 按键按下
}
}
```
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