Samg55 SPI slave w/o NSS

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Dear Community,


I would like to use the aforementioned samg55 MCU Flexcom in SPI mode, or Flexcom in USART/SPI mode in slave configuration. I would like to use custom framing, so the NSS signals are futile. Do I have to tie the NSS signal to GND nevertheless? Or is there any way to prevent wasting these pins?


Thanks in advance,