In C51, the alarm when interrupt and non-interrupt functions call the same function is RECURSIVE CALL TO FUNCTION.
The standard C language dynamically generates local variable space in the stack, so it can be recursive.
The 51 single-chip microcomputer is too weak. In order to improve operating efficiency, C51 uses the method of static allocation of local variables, so recursion is not possible.
If a function called by an interrupt and non-interrupt function runs in a non-interrupt state, after an interrupt occurs, the local variables will be destroyed, and it will be completely wrong to execute it again after the interrupt ends. This is the same principle as the non-recursive principle, so Keil also lists it as RECURSIVE CALL TO FUNCTION.
Solution: Add the reentrant modifier to this public function to make it reentrant.
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