Entering this infinite loop is actually because a certain interrupt is configured in your program. When the conditions are met, the interrupt occurs, but your program does not have a service function for this interrupt.
__iar_unhandled_exception:
0084DA 9D NOP
0084DB 20FD JRA __iar_unhandled_exception
Solution:
1. Find out which interrupt is configured in the program. If the interrupt is not needed, turn off its interrupt enable directly.
2. If this interrupt is what you need, implement its corresponding interrupt service function correctly. I did not implement the corresponding interrupt service function correctly, which led to this infinite loop.
3. Directly turn off the general interrupt disableInterrupts(), which can also temporarily solve this problem, but it will affect the use of the interrupt.
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