流水灯代码错误

ID:51709 · 发表于 2013-7-11 03:13

#include<reg52.h>
#include<intrins.h>
unsigned int a,b,c;
unsigned char d;
void delay(unsigned char);
void main()
{
d=0xfe;
while(1)
{
   P1=d;
   delay(100);
  d=_crol_(d,1);
  }
}
void delay(unsigned char x)
{
for(b=500;b>0;b--)
  for(c=x;c>0;c--);
}
用KELL编译时出现这个错误
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL:  ?C_START
MODULE:  .\STARTUP.obj (?C_STARTUP)
ADDRESS: 000DH
Program Size: data=9.0 xdata=0 code=15
creating hex file from "lesson1_4"...
"lesson1_4" - 0 Error(s), 2 Warning(s).
是咋回事啊牛牛们