照着原子的视频自己写了跑马灯的寄存器程序，把SYSTEM文件夹搬过来后，编译不成功。
compiling delay.c...
..SYSTEMsysstm32f4xx.h(102): error:  #35: #error directive: "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)"
   #error "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)"
..SYSTEMdelaydelay.c: 0 warnings, 1 error
compiling usart.c...
..SYSTEMsysstm32f4xx.h(102): error:  #35: #error directive: "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)"
   #error "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)"
..SYSTEMusartusart.c: 0 warnings, 1 error
compiling sys.c...
..SYSTEMsysstm32f4xx.h(102): error:  #35: #error directive: "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)"
   #error "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)"
..SYSTEMsyssys.c: 0 warnings, 1 error
compiling main.c...
..SYSTEMsysstm32f4xx.h(102): error:  #35: #error directive: "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)"
   #error "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)"
..USERmain.c: 0 warnings, 1 error
compiling LED.C...
..SYSTEMsysstm32f4xx.h(102): error:  #35: #error directive: "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)"
   #error "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)"
..HARDWARELEDLED.C: 0 warnings, 1 error
"..OBJLED_light.axf" - 5 Error(s), 0 Warning(s).
Target not created.