How do I include a C file in my Nios II C software project? - How do I include a C file in my Nios II C software project? Description C2H doesn’t support generating accelerators from C files. There is a work-around which will enable you to call your accelerator(s) from a C program which involves moving the functions you wish to accelerate from a C source file to a C source file. Once your functions are in a C source file, the C2H compiler can effectively “see them” and convert them into hardware accelerators. There are some additional steps necessary for mixing C and C functions (and files). The GNU tool-chain supports the calling of C functions from C programs (and vice versa) through a well defined methodology of explicit assertion. The way this works is that, from your C program you tell the compiler which functions should be call as C functions- instead of C . This operation is done through the use of the extern “C” syntax within the C source file. Some examples of the extern “C” syntax in action are as follows: Calling C function from C program Setup: You have a function void bar(void) , which lives in C source file “bar.c” that you want to call from the C source file “foo.cpp”. Solution: Add this to the top of “foo.cpp”- extern “C”void foo(void); Calling C functions from C program Setup: A collection of functions which lives in C source file “bar.c” that you want to call from the C source file “foo.cpp”. Solution: Simply add braces around the group of functions at the top of the extern statement in “foo.cpp”- extern “C” { void foo(void); int foo2(int number); int foo3(int number1, int number2); } Calling a C header from a C program Setup: You have a whole collection of C functions (or a library) in a file called “bar.c” that you want to call from your C program “foo.c”, and you really don’t want to list them individually through procedure #2 (above). You do have a header file for “bar.c” called “bar.h” which declares the interface to the functions. Solution: The extern statement also works for header files… In the file “foo.cpp”, use the extern statement to add the header file- extern “C” { #include “bar.h” } Which methodology is best to use with C2H? W hen using the C2H compiler, it is recommended that a user “isolate” the function for acceleration into its own file, so using the first example is the best approach for accelerating functions with the C2H compiler. Custom Fields values: ['novalue'] Troubleshooting novalue False ['Nios® II Processor'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']