Part Number: MSP430FR5738
P1.3 io口配置成输入模式，并且外部通过这种方式输入检测。上电后发现，会一直检测到低电平，而光耦是没有导通的。 必须光耦导通一次，输入才会判断正常。
在上电后测试输入电压，一直为高电平，但程序却判断一直为低。
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