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DS90UB948-Q1: GPIO5-GPIO9作为输入,但读6f和6e寄存器一直为0

Part Number: DS90UB948-Q1


用ub948的gpio5-9想读取外部电平状态,根据手册将其配置为input模式,写对应寄存器为3

例,gpio6 reg20 -> 30

gpio6已外部拉高

但读0x6e,一直为0;

请问是否还需配置其他地方?