# ------------------------------
# LED配置
# ------------------------------

from maix import camera, display, image, nn, app, sys
from maix import uart, pinmap, time, err, gpio
import traceback

LED_PIN_NAME = "A14"
LED_GPIO_NAME = "GPIOA14"
BLINK_INTERVAL = 500  # LED闪烁间隔(ms)


# ------------------------------
# 全局业务状态变量
# ------------------------------
led = None                       # LED实例
serial_dev = None                # 舵机串口全局变量
previous_millis = 0              # LED闪烁计时

# ------------------------------
# LED控制
# ------------------------------
def init_led():
    """初始化LED引脚"""
    global led
    try:
        err.check_raise(
            pinmap.set_pin_function(LED_PIN_NAME, LED_GPIO_NAME),
            f"设置LED引脚{LED_PIN_NAME}功能失败"
        )
        led = gpio.GPIO(LED_GPIO_NAME, gpio.Mode.OUT)
        led.value(0)  # 初始熄灭
        print(f"LED初始化完成：引脚{LED_PIN_NAME}（{LED_GPIO_NAME}）")
    except Exception as e:
        print(f"LED初始化失败: {e}")
        led = None

def update_led():
    """更新LED状态：改为固定闪烁模式"""
    global previous_millis
    if led is None:
        return
    
    current_millis = time.time_ms()
    if current_millis - previous_millis >= BLINK_INTERVAL:
        previous_millis = current_millis
        led.toggle()