Previous versions of nrfx_spis.h:nrfx_spis_config_t had a "csn_pullup" field but the latest version does not.
The nRF52840 Product Specification is not very clear about how the CSN pin configuration is handled. Does the GPIO pin need to be configured using the GPIO PIN_CNF registers or does the SPIS take control over the PSEL.CSN pin? Will SPIS override GPIO configurations for this pin?
Thank you!