Hi Bilge kaan ugur,
The PE module just have one CS to select, if you want to add other CS, don't worry, just select one CS at first, but don't use it in the detail code.
You can use the GPIO used as the according slave CS, before you want to send the data, use code set the according pin as low, after the SPI data is sent, then pull the CS pin high.
Wish it helps you!
If you still have question, please let me know!
Have a great day,
Kerry
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