问 用keil的RV编译程序无法进入FIQ中断，我看RV_cc上说用__irq标注FIQ函数可实现FIQ中断可是我用__irq还是不能正确进入FIQ，那位大侠能指点下或者各个示例看看，小弟不胜感谢 答 1: 看看keil的帮助：The following C code implements an empty FIQ_Handler:

__irq void FIQ_Handler (void) {
  ;
}

In the Startup Code the following modification is required to call this FIQ_Handler:

Vectors          LDR     PC, Reset_Addr         
                 :
                 LDR     PC, FIQ_Addr        ; Instruction at FIQ Vector location
                 :

                 PRESERVE8                   ; tell linker: stack alignment is 8-byte
                 IMPORT  FIQ_Handler         ; use external FIQ_Handler
FIQ_Addr         DCD     FIQ_Handler         ; FIQ Entry point

答 2: 谢谢computer00谢谢computer00，我一直以为改为RV后我没有用正确的函数头标示，也没往启动文件考虑。原来Keil的RV启动文件根本没考虑FIQ的功能，让俺好找呀！严重鄙视一下keil.