嵌入式51中volatile报错定义全局变量

Question

```c
*** ERROR L104: MULTIPLE PUBLIC DEFINITIONS
    SYMBOL:  B
    MODULE:  .\Objects\main.obj (MAIN)
   DEFINED:  .\Objects\acmp.obj (ACMP)
*** WARNING L46: SFR SYMBOL HAS DIFFERENT VALUES
    SYMBOL:  B
    MODULE:  .\Objects\main.obj (MAIN)
   DEFINED:  .\Objects\acmp.obj (ACMP)
*** WARNING L46: SFR SYMBOL HAS DIFFERENT VALUES
    SYMBOL:  B
    MODULE:  .\Objects\mygpio.obj (MYGPIO)
   DEFINED:  .\Objects\acmp.obj (ACMP)
*** WARNING L46: SFR SYMBOL HAS DIFFERENT VALUES
    SYMBOL:  B
    MODULE:  .\Objects\led.obj (LED)
   DEFINED:  .\Objects\acmp.obj (ACMP)
*** WARNING L46: SFR SYMBOL HAS DIFFERENT VALUES
    SYMBOL:  B
    MODULE:  .\Objects\delay.obj (DELAY)
   DEFINED:  .\Objects\acmp.obj (ACMP)
*** WARNING L46: SFR SYMBOL HAS DIFFERENT VALUES
    SYMBOL:  B
    MODULE:  .\Objects\myadc.obj (MYADC)
   DEFINED:  .\Objects\acmp.obj (ACMP)
*** WARNING L46: SFR SYMBOL HAS DIFFERENT VALUES
    SYMBOL:  B
    MODULE:  .\Objects\myuart.obj (MYUART)
   DEFINED:  .\Objects\acmp.obj (ACMP)
*** WARNING L46: SFR SYMBOL HAS DIFFERENT VALUES
    SYMBOL:  B
    MODULE:  .\Objects\mytimer0.obj (MYTIMER0)
   DEFINED:  .\Objects\acmp.obj (ACMP)
*** WARNING L46: SFR SYMBOL HAS DIFFERENT VALUES
    SYMBOL:  B
    MODULE:  .\Objects\exitP04.obj (EXITP04)
   DEFINED:  .\Objects\acmp.obj (ACMP)
*** WARNING L46: SFR SYMBOL HAS DIFFERENT VALUES
    SYMBOL:  B
    MODULE:  .\Objects\mypwm.obj (MYPWM)
   DEFINED:  .\Objects\acmp.obj (ACMP)
*** WARNING L26: DATA TYPES SLIGHTLY DIFFERENT
    SYMBOL:  Get_ADC
    MODULE:  .\Objects\main.obj (MAIN)
   DEFINED:  .\Objects\myadc.obj (MYADC)
Program Size: data=85.1 xdata=0 const=58 code=5015
Target not created.
Build Time Elapsed:  00:00:01

```

Answer 1

这个错误是由于在多个模块中定义了相同的全局变量导致的。为了解决这个问题，你需要检查你的代码，确保每个模块中的全局变量都是唯一的。如果需要共享全局变量，可以使用静态变量或者将它们定义为全局变量。

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