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MSPM0G3507：如何设置SPI多片选引脚

Jackson Zhang
Prodigy 40 points
Part Number: MSPM0G3507

设置SPI多个片选引脚除了config里面定义的其余引脚是否需要用GPIO虚拟，同时虚拟出来的引脚对传输速率是否有影响

  • 0
    TI__Expert 7930 points

    Hello Jackson，

    可以使用GPIO模拟，在每次SPI发送之前，对SPI的片选信号也会进行控制，所以SPI的片选信号就是在每次需要发送到某个设备的时候，将CS片选端进行拉低/拉高控制。所以可以使用GPIO进行片选信号的模拟， 在你每次发送之前，去控制GPIO的输出进而控制片选。控制GPIO的速度很快，所以理论上应该对你的传输速率没有太大影响。

    Best Regards,

    Janz Bai