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i need the steps to write simple code in C or C++ example : sum of matrix element
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It is unclear what your goal is. Are you looking to write C/C++ code that runs on a processor subsystem instantiated in an FPGA (like NIOS or SOC), or are you expecting to write C/C++ code that is compiled directly to FPGA logic cells / hardware?
If the former, there are NIOS soft core processors available for the Cyclone II FPGA (and development boards which I suspect you would be using). However, this is not really using an FPGA to be an FPGA; what you would be doing is just running C code on a processor. You could do that on an Arduino board for much less cost, and a much simpler environment.
Otherwise, if you want to run something that looks like C/C++ on an FPGA, then you might explore the OpenCL environment that is available for some FPGA boards (however not Cyclone II I believe, but I could be wrong). Google 'altera opencl' to get lots of links to doing this.
Here's the first link I come up with:
https://www.altera.com/products/design-software/embedded-software-developers/opencl/overview.html so you might want to start there.
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