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请教f2812的gpio的问题

我写了一个时序控制软件,用串口和gpiob来通讯和指示灯同步控制显示,问题是gpio会偶发不受控,比如时序走到t1刻,串口发出一个数,io置低点亮一个指示灯,串口数据出来了,灯却不亮,程序肯定执行了,因为发数和点灯是在一起的,这是偶发的,不知道什么问题,请指教,谢谢!