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F28335串口通信问题

测试使用F28335的SCIA,SCIB分别和GPS模块ublox-M8N进行串口通信,发现只能SCIB可以使用,SCIA接收不到数据。GPS的串口和SCIA相连之后,GPS的串口发送指示灯熄灭。按理说SCIA,SCIB的内部电路不应影响GPS的工作,现在却影响了,这是因为什么原因?