情况如下图示波器测得,出现在零点以下的负电压,导致led灯即使占空比最大的时候也是比较暗的,请假下是什么原因引起的?
已排除外围硬件电路,是直接示波器测的。
已排除低功耗等因素,是直接while(1),开始的裸程序。
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