When I using the Keil debuging the program with redefined printf, debugging the program always stop at BEAB BKPT 0xAB immediate. After repear several times, then, the program enter normal main().

I add the program piece in my mail.c

#pragma import(__use_no_semihosting_swi)
#pragma import(__use_no_semihosting) 

void _sys_exit(int x) { 
    x = x; 
} 

struct __FILE  { 
    int handle; 
}; 

FILE __stdout;

When I run the code, it can run normally.

Link - Stm32 debug停留在“BKPT 0xAB”或者“SWI 0xAB”的解決辦法

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