M452/453 USB 虚拟串口代码

谢谢楼主指点。装了芯唐的 Nu_Link Keil Driver 就没有弹出错误了，可是我在编译时却出现下述错误，不知道应该如何处理。请楼主给予指点。
*** Using Compiler 'V5.06 update 1 (build 61)', folder: 'C:\Keil_v5\ARM\ARMCC\Bin'
Rebuild target 'USBD_VCOM'
assembling startup_M451Series.s...
creating preprocessor file for IP_Initial_Fun.c...
..\Library\Device\Nuvoton\M451Series\Include\M451Series.h(215): error:  #5: cannot open source input file "core_cm4.h": No such file or directory
  #include "core_cm4.h"                       
* Cortex-M4 processor and core peripherals           */
App_Source\IP_Initial_Fun.c: 0 warnings, 1 error
creating preprocessor file for USB_Descriptor.c...
compiling IP_Initial_Fun.c...
..\Library\Device\Nuvoton\M451Series\Include\M451Series.h(215): error:  #5: cannot open source input file "core_cm4.h": No such file or directory
  #include "core_cm4.h"                       
* Cortex-M4 processor and core peripherals           */
App_Source\IP_Initial_Fun.c: 0 warnings, 1 error
creating preprocessor file for USB_Basic.c...
..\Library\Device\Nuvoton\M451Series\Include\M451Series.h(215): error:  #5: cannot open source input file "core_cm4.h": No such file or directory
  #include "core_cm4.h"                       
* Cortex-M4 processor and core peripherals           */
App_Source\USB_Basic.c: 0 warnings, 1 error
compiling USB_Descriptor.c...
creating preprocessor file for USB_EP_M453.c...
..\Library\Device\Nuvoton\M451Series\Include\M451Series.h(215): error:  #5: cannot open source input file "core_cm4.h": No such file or directory
  #include "core_cm4.h"                       
* Cortex-M4 processor and core peripherals           */
App_Source\USB_EP_M453.c: 0 warnings, 1 error
compiling USB_Basic.c...
..\Library\Device\Nuvoton\M451Series\Include\M451Series.h(215): error:  #5: cannot open source input file "core_cm4.h": No such file or directory
  #include "core_cm4.h"                       
* Cortex-M4 processor and core peripherals           */
App_Source\USB_Basic.c: 0 warnings, 1 error
creating preprocessor file for main.c...
..\Library\Device\Nuvoton\M451Series\Include\M451Series.h(215): error:  #5: cannot open source input file "core_cm4.h": No such file or directory
  #include "core_cm4.h"                       
* Cortex-M4 processor and core peripherals           */
App_Source\main.c: 0 warnings, 1 error
compiling USB_EP_M453.c...
..\Library\Device\Nuvoton\M451Series\Include\M451Series.h(215): error:  #5: cannot open source input file "core_cm4.h": No such file or directory
  #include "core_cm4.h"                       
* Cortex-M4 processor and core peripherals           */
App_Source\USB_EP_M453.c: 0 warnings, 1 error
compiling main.c...
..\Library\Device\Nuvoton\M451Series\Include\M451Series.h(215): error:  #5: cannot open source input file "core_cm4.h": No such file or directory
  #include "core_cm4.h"                       
* Cortex-M4 processor and core peripherals           */
App_Source\main.c: 0 warnings, 1 error
".\obj\USBD_VCOM.axf" - 8 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed:  00:00:00

找到原因了，是路径设置有误，在Project\Options for Target ‘USBD_VCOM’\C/C++\Include Paths\ 中添加
..\Library\CMSIS\Include
即可编译成功。看来是原文路径设置有误。

下载看看。。。

谢谢分享。。。