There are many functions in the STM32 firmware library, and each function represents a different meaning.
In the project, files with the suffix .s are files written in assembly language, and files with the suffix .c are files written in C language.
In the entire project, only startup_stmf10x_md.s in Startup is written in assembly language and is mainly used for microcontroller startup code. After the microcontroller is started, all running files are written in C language.
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There are too many functions and definitions in the library. I won’t go into details here. Welcome. Please download the Chinese version of the STM32 Firmware Library User Manual for study and reference.