1. Compilation
The mdk software will select the assembly file added by the user to the project file to execute (for example, startup_stm32f10x_md.s), and initialize the basic content such as stack space. This file is usually provided by the chip manufacturer, and the user can select and call it.
2. Jump to main function
After the assembly is executed and initialized, it will eventually jump to the main function at the point circled in red below.
__main can be changed to other names such as smain, and the corresponding main function name can be changed to smain, which can also complete the jump
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