EXTI->PR = EXTI_Line16;//EXTI_ClearITPendingBit(EXTI_Line16);/* 系统上电前500ms, 不认为是掉电; 若已处于系统掉电状态, 将不再处理 */if((rt_tick_get() <50) || (NULL== rtc_dev) || is_system_powerdown) {return; }/* lcd_bl_led_off(); buzzer_off(buzzer_gpio, buzzer_pin); ...