CCS: [CC3220S/SDK4.10] How to build sl_DeviceUartSetMode function?

Tool/software: Code Composer Studio

Hi TI,

Im going to change baud rate to higher than default. I checked the programming guide and know

1. We need to add define SL_IF_TYPE_UART to user.h. May I add SL_IF_TYPE_UART into my project define in stead of user.h in SDK folder?
2. When I try to build sl_DeviceUartSetMode, learn following error. What library should I add to my project?

 
 undefined            first referenced     
  symbol                  in file          
 ---------            ----------------     
 sl_DeviceUartSetMode ./peripheral/wifi.obj
 
error #10234-D: unresolved symbols remain
error #10010: errors encountered during linking; "amba_ti_bpi_app_CC3220S_LAUNCHXL_tirtos_ccs.out" not built

Thanks a lot.