Today when I was debugging a program, I found that when a function return value was assigned to a variable, the variable value always displayed "not in scope" and I could not see the value assigned to the variable.
The reason for this is that the local variable is not allocated to memory, or the variable is optimized by the compiler.
When the compiler optimization level is high, the compiler may not assemble the code we want to execute for optimization.
Solution: Reduce Keil's compilation optimization options, as shown in the figure below, and change the optimization level to 0 (the default is 3).
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