SPI Chip Select

[josephchen]

I'm using Kinetis MCUs. I wonder if it is possible to connect two SPI slave devices shared the same SS line. One of the SS lines contains a NOT logic gate so I can select the slave device by changing its GPIO value in callback function. Is it possible?

[jeremyzhou]

Hi Joseph，

After learned your statement, I think this scenario can work out.

But I don't consider this method is good enough, I will prefer to share SPI_MISO、SPI_MOSI、SPI_SCLK pin, then use the different GPIO as the SS pin to select the external device.
Have a great day,
Ping

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