arduino esp32-c3定时器在按下开关键后才开始计数代码

可以使用esp_timer_create()函数创建定时器，然后使用gpio_set_intr_type()函数监听按键状态，当按键按下时，启动定时器进行计数。以下是示例代码：

#include "driver/gpio.h"
#include "driver/timer.h"

#define TIMER_DIVIDER         16  // 定时器分频系数
#define TIMER_SCALE           (TIMER_BASE_CLK / TIMER_DIVIDER)  // 定时器计数器分辨率
#define TIMER_INTERVAL_SEC    1   // 定时器触发时间间隔

static void IRAM_ATTR gpio_isr_handler(void* arg)
{
    // 按键按下时触发，启动定时器计数
    timer_start(TIMER_GROUP_0, TIMER_0);
}

static void timer_isr(void* arg)
{
    // 定时器触发时执行的回调函数
    static int count = 0;
    count++;
    printf("Count: %d\n", count);
}

void app_main()
{
    // 初始化GPIO
    gpio_config_t gpio_cfg = {
        .pin_bit_mask = 1 << GPIO_NUM_0,
        .mode         = GPIO_MODE_INPUT,
        .pull_up_en   = GPIO_PULLUP_ENABLE,
        .intr_type    = GPIO_INTR_NEGEDGE,
    };
    gpio_config(&gpio_cfg);

    // 安装GPIO中断处理函数
    gpio_install_isr_service(0);
    gpio_isr_handler_add(GPIO_NUM_0, gpio_isr_handler, NULL);

    // 创建定时器
    timer_config_t timer_cfg = {
        .alarm_en    = TIMER_ALARM_EN,
        .counter_en  = TIMER_PAUSE,
        .intr_type   = TIMER_INTR_LEVEL,
        .counter_dir = TIMER_COUNT_UP,
        .auto_reload = TIMER_AUTORELOAD_EN,
        .divider     = TIMER_DIVIDER,
    };
    timer_init(TIMER_GROUP_0, TIMER_0, &timer_cfg);
    timer_set_counter_value(TIMER_GROUP_0, TIMER_0, 0);
    timer_set_alarm_value(TIMER_GROUP_0, TIMER_0, TIMER_INTERVAL_SEC * TIMER_SCALE);
    timer_enable_intr(TIMER_GROUP_0, TIMER_0);
    timer_isr_register(TIMER_GROUP_0, TIMER_0, timer_isr, NULL, 0, NULL);

    while (1) {
        // 主任务循环中不需要做任何事情
        vTaskDelay(portMAX_DELAY);
    }
}