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【IAR警告】Warning[Pa082]
Warning[Pa082]: undefined behavior: the order of volatile accesses is undefined in this statement运算符两边都是volatile变量的警告这警告有意义.用volatile修饰的变量一般不直接参与运算，volatile就以为着这
Warning[Pa082]: undefined behavior: the order of volatile accesses is undefined in this statement运算符两边都是volatile变量的警告这警告有意义.用volatile修饰的变量一般不直接参与运算，volatile就以为着这
