Question

单片机c编程：*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL

程序：
#include<reg52.h>
void mian()
{
while(1)
{
while(!RI); //检测是否收到数据 若收到则RI=1
RI=0; //清零
P1=0xfe;// 点亮P1口第一个发光二级管
}
}

Build target 'Target 1'
assembling STARTUP.A51...
compiling lesson7----.c...
linking...
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
SEGMENT: ?PR?MIAN?LESSON7____
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: MAIN
MODULE: E:\KEIL\C51\LIB\C51S.LIB (?C_INIT)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: MAIN
MODULE: E:\KEIL\C51\LIB\C51S.LIB (?C_INIT)
ADDRESS: 0010H
Program Size: data=9.0 xdata=0 code=154
"lesson7----" - 0 Error(s), 3 Warning(s).

Answer 1

你的 void mian() 写错了，应该是void main() 改正后就没错了，希望能悄腊兆局手帮到你。启租

Answer 2

#include<reg52.h>吵祥
void main()
{
while(1)
{
while(!RI); //检测是旦碰弯否收到数据 若收到则RI=1
RI=0; //清零
P1=0xfe;// 点亮P1口模闷第一个发光二级管
}
}

是main，你写的mian!!!