The role of the watchdog
The watchdog can solve the problem of software deadlock, but the hardware deadlock (your situation) cannot be recovered with the watchdog. Once a hardware deadlock occurs, it can only be solved by powering off. To avoid hardware Deadlock, only work hard on the hardware.
It is estimated that the communication level exceeds the limit level that can be input by the pins of the single-chip microcomputer.
Added a watchdog chip and still crashed
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Origin blog.csdn.net/weixin_44981087/article/details/130169998
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