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| 楼主用keil编译出了好多错 ** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
 SYMBOL:  NUM_USART
 MODULE:  Smart_Usart.obj (SMART_USART)
 ADDRESS: 0BB4H
 ** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
 SYMBOL:  USRTLEN
 MODULE:  Smart_Usart.obj (SMART_USART)
 ADDRESS: 0BBBH
 ** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
 SYMBOL:  USARTBUF
 MODULE:  Smart_Usart.obj (SMART_USART)
 ADDRESS: 0BC2H
 ** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
 SYMBOL:  USARTBUF
 MODULE:  Smart_Usart.obj (SMART_USART)
 ADDRESS: 0BC8H
 ** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
 SYMBOL:  USRTLEN
 MODULE:  Smart_Usart.obj (SMART_USART)
 ADDRESS: 0BCFH
 ** ERROR L118: REFERENCE MADE TO ERRONEOUS EXTERNAL
 SYMBOL:  USARTBUF
 好多这个错,是怎么回事
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