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变量在IPC中断服务函数出现异常



在main.c文件中定义了一个全局变量,在IPC.C文件的中断服务函数IPC_ISR()中修改其值,调试时看到其值修改过了,但离开IPC_ISR()后其值又恢复为原值,这是什么情况?