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Code C sintax document for programming on DM6446

Hello!

Because of my undergraduate thesis project I need to make a FPGA implantation of a Neural Network . I have to use a Lyrtech Small Form SDR platform that contains a DM6446 DSP. 

I have decided to make the exponential operation inside the DSP because I think uC are faster for float point operations than DSPs.

As I don´t have  much experience I have decided to start doing practical exercises in order to adquire the skill of programming DSPs. 

So firstly I would like to make a small and simple program which have make a operation like a multiplication or sum

For instances, something like:

output = input *2;

I supposed it should be registers to save my input value for the variable 'input' and a register to save the value for the variable 'output'. The problem is that I am not how to access this registers by writting c code.

Does anyone how?

Does anyone some code c sintax document to do this kind of things?

Thank you very much.