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Why IAR can't add source file of StdPeriph_Drive

Question asked by gao.shenghan on Nov 26, 2013
I have uncommend all the Periph_Drive, but the compiler still do not compile their source file. 
Why there are some source file are gray? I want to use TIM1, but the compiler keeps tell me the function inside it have being defined. 

I have been tortured by this for almost all day? Can anyone help me? Thank you.