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How can i set the DSP registers?

Hi

I have a custom board with 6678 and I want to send a data from DSP to FPGA with GPIO pins but i don't know how i must set the GPIO registers. I read  GPIO User Guide (SPRUGH7) and i know that i must set registers like "DIR", "SET_DATA" or "CLR_DATA" but i don't know what libraries are important and what instruction must be used?! 

If you have any document which can help me, please share with me