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STemWin AN4323 clock enable issue

Question asked by Assaf on Nov 5, 2015
Latest reply on Nov 7, 2015 by Assaf
as required in the STemwin manual i have to enable RCC AHB1 CRC clock.
 "The CRC module (in RCC peripheral clock enable register) should be enabled before using the library"
trying to use 
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_CRC, ENABLE);
as it apears at AN4323,
i get error "identifier undefined" and "function declared implicitly"
how i enable that?