出错是因为你当前运行的文件调用到了core_cm3.h，而core_cm3.h文件中包含了有IRQn_Type类型名，但是此类型名是在“stm32f10x.h”中定义的，所以你需要在当前文件包含#include "core_cm3.h"之前先包含#include "stm32f10x.h"
记住，两个头文件如果顺序错误也会报错
#include "stm32f10x.h" #include "core_cm3.h"
"IRQn_Type" is undefined
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