程序報了一個錯誤，是關于重復定義引用的，但實在找不出是哪里的問題？下面是報錯信息：
linking...
*** WARNING L15: MULTIPLE CALL TO SEGMENT
SEGMENT: ?PR?_PRINTCOM?USART
CALLER1: ?PR?EXTINT0HANDLER?MAIN
CALLER2: ?C_C51STARTUP
Program Size: data=29.0 xdata=0 code=1875
creating hex file from "1111"...
"1111" - 0 Error(s), 1 Warning(s).
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