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测试EK-TM4C1294XL上的3.3V和5V的输出，3.3V测量值大于4V，5V测量值大于6V，且在ICDI供电情况下这两个电压还在不断缓慢上升。
请问这是由什么原因导致的呢？
万用表坏了吧。3.3测量大，可以理解为LDO坏了，5v 测量6V，本来用的是USB供电，哪来这么大的电压呢？
