Reference an FPGA Array of Controls

[Paul_Knight_Lockheed_Mart]

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?

[USBarnes · Accepted solution]

Hi Paul_Knight,

When the C headers are generated, there should be one called NiFPGA.h.

There is a function within this header for reading a U32 array. The function is called NiFpga_ReadArrayU32. Here is some documentation on the various read array functions.

http://zone.ni.com/reference/en-XX/help/372928G-01/capi/functions_readarray/

You should be able to read the array values and store them into an array in C. Then you can access them as you would normally within your C program. Hope this helps!

[Paul_Knight_Lockheed_Mart]

Thanks, I should have looked there first.