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Hi.I am writing a program and when i want to compile it there are a lot of error like this: .\camera.axf: Error: L6218E: Undefined symbol ov7670_set (referred from main.o). .\camera.axf: Error: L6218E: Undefined symbol I2CInit (referred from main.o). It is after main.c and before linking. What should i do? If you help me i will be appreciate because that is the only problem in my program and i do not know how to solve it.