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也就是我在InitXintf32Gpio()这个函数里可以只把需要的XD0到XD17设置成数据线,其他的XD18到XD31不设置,这样配制成的存储器接口数据总线就是18位的??
请问如果我用SPI口连接一个器件,只用到了其中三根线,没用到SOMI,那这个引脚该如何处理,下拉到地OR悬空??