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I was using the NanoVNA-D-v1.2.29 source code, and found that there is a bug in exti_v1.c.
Because I added PA8 as an external interrupt, but when I enable the relevant code, I found that after triggering the PA8 interrupt, the program would go into an endless loop, and when I checked the code, I found that this piece of code is missing: EXTI->PR = pr;

The problem was fixed with the addition of this piece of code