Reference an FPGA Array of Controls

I am developing a cRIO application that has an array of 23 controls in the FPGA.  The FPGA Interface C API Generator defined them as a name and size.

typedef enum
{
   NiFpga_ControlArrayU32_Setpoints = 0x8118,
} NiFpga_ControlArrayU32;

typedef enum
{
   NiFpga_ControlArrayU32Size_Setpoints = 24,
} NiFpga_ControlArrayU32Size;

How would I reference the 15th setpoint, as NiFpga_ControlArrayU32[15] or as an offest to 0x8118?