CC3230SF: About control from MCUinCC3230SF to NWP

if you are using an external host and want to communicate with the NWP through SPI - you can use CC3130 which is an NWP only device (without the M4 MCU).

CC3130 support both UART  and SPI as the host interface. You can start by checking SIMPLELINK-SDK-WIFI-PLUGIN that demonstrates the architecture using MSP432 as the host. The plugin's documentation provides guidance for porting to other host platforms. 

When using the CC32xx - you can check the AT-Commands example in the SDK.

In this example (running on the M4 MCU) the CC32xx enables an AT-Commands interface over UART toward an external controller. You should be able to replace the UART with SPI in the example code or you can write your own code on the CC32xx MCU and use the provided examples as references (e.g. you can find examples for using the SPI driver code and examples that uses wi-fi in different use-cases).

If you don't really need the external controller you may be able to replace it with M4 MCU on the CC3230 to simplify the system solution.