keil编译时出现reference made to unresolved external,

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keil编译时出现referencemadetounresolvedexternal,keil编译时出现referencemadetounresolvedexternal,keil编译时出现refer

keil编译时出现reference made to unresolved external,
keil编译时出现reference made to unresolved external,

keil编译时出现reference made to unresolved external,
某个 tempdelay的external函数声明了没有申明或者没有实体