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SPI1 interface SPI0_CS1都被占用了，请问AM3352 SPI0 CS0#能否扩展成4个CS#（需外接4个外设），如可能，如何扩展
或者普通GPIO是否可以当作CS信号来用
用GPIO吧，想扩几个扩几个
GPIO当片选信号时可取的方法，但驱动估计要费点事情
