51keil编译错误
51单片机KEIL编译错误*** WARNING L1: UNRESOLVED EXTERNAL SYMBOLSYMBOL:TIME_FLAG
MODULE:.\list\main.obj (MAIN)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL:TIME_FLAG
MODULE:.\list\main.obj (MAIN)
ADDRESS: 03F6H
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL:TIME_FLAG
MODULE:.\list\main.obj (MAIN)
ADDRESS: 03F9H
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL:TIME_FLAG
MODULE:.\list\interrupt.obj (INTERRUPT)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL:TIME_FLAG
MODULE:.\list\interrupt.obj (INTERRUPT)
ADDRESS: 079BH
Program Size: data=14.0 xdata=33 code=1954 FLAG_TIME是1毫秒中断标志位,check_time检测等待时间,都在头文件里定义了的,还是有警告extern bit Time_FLAG; //10ms 时间标记extern bit Time_FLAG; //10ms 时间标记
extern unsigned char aa;
//extern long temp2,temp; //10ms 时间标记
extern unsigned char Check_time; //检测时间 extern 只是声明,并未定义 lcw_swust 发表于 2014-7-24 20:41
extern 只是声明,并未定义
好的啊, lcw_swust 发表于 2014-7-24 20:41
extern 只是声明,并未定义
申明过了,应该再定义一次吗,bit Time_FLAG; //10ms 时间标记,unsigned char Check_time吗 三国小兵 发表于 2014-7-24 21:33
申明过了,应该再定义一次吗,bit Time_FLAG; //10ms 时间标记,unsigned char Check_time吗 ...
申明和定义是不一样的,在哪定义的? lcw_swust 发表于 2014-7-24 21:35
申明和定义是不一样的,在哪定义的?
在头文件了定义的, 变量的声明在头文件即.h文件,但变量的定义应在.c文件中,因此连接的时候没有找到该全局变量 好的........... 建意楼主看看 c和 指针
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