Nano Matter as SPI slave

Official Hardware Nano Family Nano Matter
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I want to use Nano Matter as an SPI Slave, but I cannot find any reference material anywhere. I cannot use the SPI library since it doesn't support the slave mode.

I want to have a setup where a bunch of Arduinos are connected via SPI to a master, which is Raspberry PI. I already did it using Uno and it works fine, I based my code on an example found here, but that won't compile on Nano matter.

Where can I find some reference material or examples for using Nano Matter as SPI Slave?

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