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am3359 spi问题



在做spi0的驱动,不知道为什么接受数据一直为0xFF,自发自收可以,但是不能跟伺服之间通信,寄存器配置之后spi0_clk管脚为低电平,但是我配置的是高,POL设置为1,请问怎样配置寄存器?