Hi:

Using C51 Lib in Creator 1.0, printf() works as putchar() re-defined in main file.

But when re-define getchar() to implement scanf(), error happened:

*** ERROR L104: MULTIPLE PUBLIC DEFINITIONS
    SYMBOL:  GETCHAR
    MODULE:  C:\PROGRAM FILES\CYPRESS\PSOC CREATOR\1.0\PSOC CREATOR\IMPORT\KEIL\PK51\8.16\C51\LIB\C51L.LIB (GETCHAR)
    DEFINED:  E:\1_WaveDAC8_SimpleSine.cydsn\DP8051_Keil_816\Debug\main.OBJ (MAIN)

   Any idea about that ?

  Thanks very much.

Any reason why need to change name of libray function?

I don't think it is a good thing to rename library function. If I need to, I will do something like

char myPutChar(char ip)

{

    return putchar(ip);

}

then call myPutchar() later on.

Could you tell us why you are trying to do this ?

Thanks very much for your reply. 

Sure, it can be done by retargeting to a function named differently.  What puzzled me is the difference for retartgeting functions in Creator. In KEIL, both functions can be redefined directly.

Thanks.

For your question about my senario: getchar() can't be redefined in creator. So I can't use scanf() directly in Creator now.