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CCS/TMS320F28388D: How the .c and .h files linked with each other in enet_lwip example project?

Part Number: TMS320F28388D
Other Parts Discussed in Thread: C2000WARE

Tool/software: Code Composer Studio

Dear Sir or Madam,

I am digging into the enet_lwip example project for F28388D.

There is an important function Ethernet_initInterface called in enet_lwip.c file. 

When I put my mouse on the text "Ethernet_initInterface", then press F3, then I can find the function declaration as follows,

But I can not find the original Ethernet_initInterface function.

Actually the Ethernet_initInterface function is in the ethernet.c file, which is in the \C2000Ware_3_03_00_00\driverlib\f2838x\driverlib_cm directory.

But the ethernet.c file is not added in the project.

How does the CCS know this ethernet.c file and complete the compilation successfully??

Thanks!

zhou ping