Connecting multiple SPI devices to Texas Instruments CC3200 LaunchPad
If you have enough GPIOs on your controller, you can wire them directly to the SS pins of the SPI devices. If your SS pin is active high, you need to add pull-down resistor, if it's active low, you need to add pull-up resistor.

If you have not enough GPIOs to give your SPI devices each a dedicated pin or you want to save some pins, you can use decoder chips.