硬件资源
1.ESP32 开发板
2. LED灯（-接到GND, +通过10K电阻接到PIN4)
3. 触摸按键（接到PIN32,对应触摸通道9)
预期效果：
1. 点动模式：小于1s的触摸，LED交替亮灭
2. 长按模式：大于1s的触摸，LED快速闪烁(100ms)
3. 带防抖
代码如下
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "driver/touch_pad.h" // 添加触摸传感器头文件
#include "esp_log.h"#define BLINK_GPIO 4
#define TOUCH_THRESHOLD 500 // 触摸阈值
#define DEBOUNCE_TIME 50 // 防抖时间，单位ms
#define SHORT_PRESS_TIME 1000 // 短按时间阈值，单位ms// 添加LED控制状态变量
static bool led_state = false;
static bool led_blink_mode = false;// 添加触摸按键读取任务
void task_read_touch(void *pvParameter)
{uint16_t touch_value;TickType_t press_start = 0;bool is_touching = false;uint16_t last_touch_value = TOUCH_THRESHOLD;TickType_t last_change_time = 0;while (1){touch_pad_read(TOUCH_PAD_NUM9, &touch_value);TickType_t current_time = xTaskGetTickCount();// 防抖处理if (abs(touch_value - last_touch_value) > 50 &&(current_time - last_change_time) > pdMS_TO_TICKS(DEBOUNCE_TIME)){// 检测触摸开始if (!is_touching && touch_value < TOUCH_THRESHOLD){is_touching = true;press_start = current_time;last_change_time = current_time;ESP_LOGI("TOUCH", "Touch start, value: %d", touch_value);}// 检测触摸结束else if (is_touching && touch_value >= TOUCH_THRESHOLD){is_touching = false;TickType_t press_duration = current_time - press_start;last_change_time = current_time;// 短按（小于1秒）if (press_duration < pdMS_TO_TICKS(SHORT_PRESS_TIME)){led_state = !led_state;gpio_set_level(BLINK_GPIO, led_state);ESP_LOGI("TOUCH", "Short press detected! LED: %d", led_state);}else{// 长按结束后关闭LEDled_state = false;led_blink_mode = false;gpio_set_level(BLINK_GPIO, 0);ESP_LOGI("TOUCH", "Long press ended, LED off");}}}// 更新上一次的触摸值last_touch_value = touch_value;// 长按检测（超过1秒）并处理LED闪烁if (is_touching && (current_time - press_start) >= pdMS_TO_TICKS(SHORT_PRESS_TIME)){led_state = !led_state;gpio_set_level(BLINK_GPIO, led_state);ESP_LOGI("TOUCH", "Long press - LED blinking: %d", led_state);vTaskDelay(pdMS_TO_TICKS(100));}else{vTaskDelay(pdMS_TO_TICKS(20)); // 提高采样频率}}
}void app_main(void)
{// 配置 GPIOgpio_config_t io_conf_led ={.pin_bit_mask = (1ULL << BLINK_GPIO),.mode = GPIO_MODE_OUTPUT,.pull_up_en = GPIO_PULLUP_DISABLE,.pull_down_en = GPIO_PULLDOWN_DISABLE,.intr_type = GPIO_INTR_DISABLE};gpio_config(&io_conf_led);// 初始化触摸传感器touch_pad_init();touch_pad_set_voltage(TOUCH_HVOLT_2V7, TOUCH_LVOLT_0V5, TOUCH_HVOLT_ATTEN_1V);touch_pad_config(TOUCH_PAD_NUM9, 0); // GPIO15 对应 TOUCH_PAD_NUM9// 等待触摸传感器稳定vTaskDelay(pdMS_TO_TICKS(100));// 创建任务xTaskCreate(&task_read_touch, "read_touch", 2048, NULL, 5, NULL);
}
