[General] Undefined symbols in Keil

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uplifting_mind

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Hello,
I´m trying to build project with Rx and Tx interrupts from USART for STM32F10x. For Tx is used fifo buffer as a structure. During building this project, I obtained a following errors messages on the picture bellow. Notice that periph_init.h is included in both main.c and stdio_through_usart.c, where this symbols are using.
Where is a problem?

 

Have you defined these variables in your source file, or these are just extern declarations? I think you should define the variables in the source file to overcome the error.
 

You are right, it working. But this variables must be realy declared in both of this files? There are no directives for situation, when I want to have this declarations only in header file?
 

A variable must be defined.

You declare it as an extern variable to use it in another file.
 

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