Hi, im using NRF52832 whit SDK 12.3.0, when i compile this error appear, "undefined reference to `nrf_drv_spi_init", i included the "nrf_drv_spi.h" file.
also try to include the "nrf_drv_spi.c" file and move the files to the project folder.
the structures defined in "nrf_drv_spi.h" dont cause problems in the compilation.
this is how i write the functoin
nrf_drv_spi_init(&Spi_Soc,&configuracionSPI,spi_event_handler,NULL);
regards.