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why should i write somethings in Defined symbols in IAR(?)

Question asked by hossein hosseini on Oct 16, 2017
Latest reply on Oct 16, 2017 by Clive One


i have a problem in my mind , that's i cant understand why should we define somethings like "USE_STDPERIPH_DRIVER
STM32F103xE" in  the Defined symbols box?!!


and why dont we define this definition , our code give us many Error s ??

and if i want to see others Definition where can i found them??

so thanks.