keil下ARM9按键中断问题

2015-08-25 来源：eefocus

一直纠结于MDK自带启动文件不能中断，以为文件少了一些配置，网上讨论的也是沸沸扬扬！！！！！！！！

其实不然！！！！！！！！！！！！！！！！！！在一个好心的老师帮助及启发下，发现只要把IRQ_Handler当成中断名称就行了，现场保护都是反汇编（即把不是汇编的代码转换成汇编代码）自动保存的！

两种方法实现中断：

一：启动文件的中断向量表里，

IMPORT key_isr

ldr pc,=key_isr

LDR PC, FIQ_Addr

IF :DEF:__RTX

IMPORT SWI_Handler

IMPORT IRQ_Handler_RTX

ENDIF

ltorg

LDR PC, IRQ_Addr的IRQ_Addr直接改为中断函数名称（如上：key_isr）；

二：启动文件里附上

HandleEINT0    EQU    IntVTAddress
HandleEINT1    EQU    IntVTAddress +4
HandleEINT2    EQU    IntVTAddress +4*2
HandleEINT3    EQU    IntVTAddress +4*3
HandleEINT4_7   EQU    IntVTAddress +4*4
HandleEINT8_23    EQU    IntVTAddress +4*5
HandleCAM    EQU    IntVTAddress +4*6
HandleBATFLT   EQU    IntVTAddress +4*7
HandleTICK    EQU    IntVTAddress +4*8
HandleWDT    EQU    IntVTAddress +4*9
HandleTIMER0    EQU    IntVTAddress +4*10
HandleTIMER1    EQU    IntVTAddress +4*11
HandleTIMER2    EQU    IntVTAddress +4*12
HandleTIMER3    EQU    IntVTAddress +4*13
HandleTIMER4    EQU    IntVTAddress +4*14
HandleUART2     EQU    IntVTAddress +4*15
HandleLCD     EQU    IntVTAddress +4*16
HandleDMA0    EQU    IntVTAddress +4*17
HandleDMA1    EQU    IntVTAddress +4*18
HandleDMA2    EQU    IntVTAddress +4*19
HandleDMA3    EQU    IntVTAddress +4*20
HandleMMC    EQU    IntVTAddress +4*21
HandleSPI0    EQU    IntVTAddress +4*22
HandleUART1    EQU    IntVTAddress +4*23
HandleNFCON    EQU    IntVTAddress +4*24
HandleUSBD    EQU    IntVTAddress +4*25
HandleUSBH    EQU    IntVTAddress +4*26
HandleIIC    EQU    IntVTAddress +4*27
HandleUART0    EQU    IntVTAddress +4*28
HandleSPI1     EQU    IntVTAddress +4*39
HandleRTC     EQU    IntVTAddress +4*30
HandleADC     EQU    IntVTAddress +4*31

IRQ_Entry
                sub sp,sp,#4       ;reserved for PC
             stmfd sp!,{r8-r9}

             ldr r9,=INTOFFSET
             ldr r9,[r9]
             ldr r8,=HandleEINT0
             add r8,r8,r9,lsl #2
             ldr r8,[r8]
             str r8,[sp,#8]
             ldmfd sp!,{r8-r9,pc}