1.树立中止向量表
b ResetHandler;hereis the first instrument 0x00这是第一条履行的指令
b HandlerUndef ;handler for Undefined mode
b HandlerSWI ;handler for SWI interrupt
b HandlerPabort ;handler for PAbort
b HandlerDabort ;handler for DAbort
b . ;reserved
b HandlerIRQ ;handler for IRQ interrupt
b HandlerFIQ ;handler for FIQ interrupt
2. 设置缺省中止处理函数
;将一般中止判别程序的进口地址给HandleIRQ
ldr r0,=HandleIRQ ;This routine is needed
ldr r1,=IsrIRQ ;ifthere isnt subs pc,lr,#4 at 0x18, 0x1c
str r1,[r0]
3．IRQ的中止服务程序
IsrIRQ
sub sp,sp,#4;reserved for PC
stmfd sp!,{r8-r9}
ldr r9,=INTOFFSET ;地址为0x4a000014的空间存着中止的偏移
ldr r9,[r9]
ldr r8,=HandleEINT0
add r8,r8,r9,lsl#2
ldr r8,[r8]
str r8,[sp,#8]
ldmfd sp!,{r8-r9,pc}
;外部中止号判别，经过中止服务程序进口地址存储器的地址偏移确认
;PC=[HandleEINT0+[INTOFFSET]]
4．中止处理
HandlerFIQ HANDLER HandleFIQ
HandlerIRQ HANDLER HandleIRQ
HandlerUndef HANDLER HandleUndef
HandlerSWI HANDLER HandleSWI
HandlerDabort HANDLER HandleDabort
HandlerPabort HANDLER HandlePabort
5．将$HandleLabel地址空间中的数据给PC
MACRO
$HandlerLabel HANDLER $HandleLabel
$HandlerLabel
sub sp,sp,#4 ;decrementsp(to store jump address) sp=sp-4
stmfd sp!,{r0} ;PUSH the work register to stack(lr doest push because it return to originaladdress) r0进栈
ldr r0,=$HandleLabel;load the address ofHandleXXX to r0
ldr r0,[r0] ;load the contents(service routine start address) of HandleXXX
str r0,[sp,#4] ;store the contents(ISR) of HandleXXX tostack r0进栈，将ro中的数据写入sp+4为地址的存储器中
ldmfd sp!,{r0,pc} ;POP the work register and pc(jump to ISR) 康复r0的值，一起也将$HandleLabel地址空间中的数据给PC
MEND
;将$HandleLabel地址空间中的数据给PC，中止服务程序的进口
6 中止向量表
ALIGN
AREARamData, DATA, READWRITE
^ _ISR_STARTADDRESS ; _ISR_STARTADDRESS=0x33FF_FF00
;表定位在 RAM 高端，基地址为 _ISR_STARTADDRESS
;^是MAP的近义词，#是FIELD的近义词
HandleReset # 4
HandleUndef # 4
HandleSWI # 4
HandlePabort # 4
HandleDabort # 4
HandleReserved # 4
HandleIRQ # 4
HandleFIQ # 4
HandleEINT0 #4
HandleEINT1 #4
HandleEINT2 #4
HandleEINT3 #4
HandleEINT4_7 # 4
HandleEINT8_23 # 4
HandleCAM #4 ; Added for 2440.
HandleBATFLT # 4
HandleTICK #4
HandleWDT #4
HandleTIMER0 #4
HandleTIMER1 #4
HandleTIMER2 #4
HandleTIMER3 #4
HandleTIMER4 # 4
HandleUART2 # 4
;@0x33FF_FF60
HandleLCD #4
HandleDMA0 #4
HandleDMA1 #4
HandleDMA2 #4
HandleDMA3 #4
HandleMMC #4
HandleSPI0 #4
HandleUART1 #4
HandleNFCON #4 ; Added for 2440.
HandleUSBD #4
HandleUSBH #4
HandleIIC #4
HandleUART0 #4
HandleSPI1 #4
HandleRTC #4
HandleADC # 4
7映射（界说一个指针的指针）
/ Exception vector
#define pISR_RESET (*(unsigned *)(_ISR_STARTADDRESS+0x0))
#define pISR_UNDEF (*(unsigned *)(_ISR_STARTADDRESS+0x4))
#define pISR_SWI (*(unsigned *)(_ISR_STARTADDRESS+0x8))
#define pISR_PABORT (*(unsigned *)(_ISR_STARTADDRESS+0xc))
#define pISR_DABORT (*(unsigned *)(_ISR_STARTADDRESS+0x10))
#define pISR_RESERVED (*(unsigned *)(_ISR_STARTADDRESS+0x14))
#define pISR_IRQ (*(unsigned *)(_ISR_STARTADDRESS+0x18))
#define pISR_FIQ (*(unsigned *)(_ISR_STARTADDRESS+0x1c))
// Interrupt vector
#define pISR_EINT0 (*(unsigned *)(_ISR_STARTADDRESS+0x20))
#define pISR_EINT1 (*(unsigned *)(_ISR_STARTADDRESS+0x24))
#define pISR_EINT2 (*(unsigned *)(_ISR_STARTADDRESS+0x28))
#define pISR_EINT3 (*(unsigned *)(_ISR_STARTADDRESS+0x2c))
#define pISR_EINT4_7 (*(unsigned *)(_ISR_STARTADDRESS+0x30))
#define pISR_EINT8_23 (*(unsigned *)(_ISR_STARTADDRESS+0x34))
#define pISR_CAM (*(unsigned *)(_ISR_STARTADDRESS+0x38)) // Added for 2440.
#define pISR_BAT_FLT (*(unsigned *)(_ISR_STARTADDRESS+0x3c))
#define pISR_TICK (*(unsigned *)(_ISR_STARTADDRESS+0x40))
#define pISR_WDT_AC97 (*(unsigned*)(_ISR_STARTADDRESS+0x44)) //Changedto pISR_WDT_AC97 for 2440A
#define pISR_TIMER0 (*(unsigned*)(_ISR_STARTADDRESS+0x48))
#define pISR_TIMER1 (*(unsigned*)(_ISR_STARTADDRESS+0x4c))
#define pISR_TIMER2 (*(unsigned *)(_ISR_STARTADDRESS+0x50))
#define pISR_TIMER3 (*(unsigned *)(_ISR_STARTADDRESS+0x54))
#define pISR_TIMER4 (*(unsigned *)(_ISR_STARTADDRESS+0x58))
#define pISR_UART2 (*(unsigned *)(_ISR_STARTADDRESS+0x5c))
#define pISR_LCD (*(unsigned *)(_ISR_STARTADDRESS+0x60))
#define pISR_DMA0 (*(unsigned *)(_ISR_STARTADDRESS+0x64))
#define pISR_DMA1 (*(unsigned *)(_ISR_STARTADDRESS+0x68))
#define pISR_DMA2 (*(unsigned *)(_ISR_STARTADDRESS+0x6c))
#define pISR_DMA3 (*(unsigned *)(_ISR_STARTADDRESS+0x70))
#define pISR_SDI (*(unsigned *)(_ISR_STARTADDRESS+0x74))
#define pISR_SPI0 (*(unsigned *)(_ISR_STARTADDRESS+0x78))
#define pISR_UART1 (*(unsigned *)(_ISR_STARTADDRESS+0x7c))
#define pISR_NFCON (*(unsigned *)(_ISR_STARTADDRESS+0x80)) // Added for 2440.
#define pISR_USBD (*(unsigned *)(_ISR_STARTADDRESS+0x84))
#define pISR_USBH (*(unsigned *)(_ISR_STARTADDRESS+0x88))
#define pISR_IIC (*(unsigned *)(_ISR_STARTADDRESS+0x8c))
#define pISR_UART0 (*(unsigned *)(_ISR_STARTADDRESS+0x90))
#define pISR_SPI1 (*(unsigned *)(_ISR_STARTADDRESS+0x94))
#define pISR_RTC (*(unsigned *)(_ISR_STARTADDRESS+0x98))
#define pISR_ADC (*(unsigned *)(_ISR_STARTADDRESS+0x9c))
8．一个中止实例
Main()
{
KeyScan_Test;
}
void KeyScan_Test(void)
{
pISR_EINT0 =pISR_EINT2 = pISR_EINT8_23 = (U32)Key_ISR;
}
static void __irq Key_ISR(void)
{
}
