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can not insert breakpoint in .c except main.c when debugging

I have a strange problem:all the .c  can compile、build、run、download correctly, and there is no error, but when debugging, I can insert breakpoint only in main.c, cannot insert breakpoint in any other .c file.  I have checked:optimization is level 0; debug information is checked, and the related picture is follows.

    

I checked the disassemble window and found it is not normal:

when I "Step", it appears as follows, and it can not jump to subfunction:

so I want to know the reason, please help me, thank you very much!