Pitaya go board ATWINC1500-nRF52840 firmware

I’m working on a project that is quite similar to the Pitaya Go board.
In brief, I’m trying to interface an ATWINC1500 wifi module with a nRF52840 board.

Because Pitaya Go is an open-source project, it may be possible to get access to the .C or .CPP files that were used to establish the SPI interface between the WiFi module and the microcontroller. As Nordic currently has no support for WiFi, I was wondering if I could take a look at how the WiFi module was interfaced with the microcontroller in the project.