ARM C中中断程序和其他的c的中断程序一样,就是有中断向量表,入口地址,中断应用程序三部分组成

//中断向量表

// ISR

#define pISR_RESET     (*(unsigned *)(_ISR_STARTADDRESS+0x0)) #define pISR_UNDEF     (*(unsigned *)(_ISR_STARTADDRESS+0x4)) #define pISR       (*(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)) //中断初始话

void Isr_Init(void)

{     pISR_UNDEF=(unsigned)HaltUndef;/     pISR  =(unsigned)Hal;     pISR_PABORT=(unsigned)HaltPabort;     pISR_DABORT=(unsigned)HaltDabort;     rINTMOD=0x0;   // All=IRQ mode     rINTMSK=BIT_ALLMSK;   // All interrupt is masked.

    //pISR_URXD0=(unsigned)Uart0_RxInt;

    //rINTMSK=~(BIT_URXD0);   //enable UART0 RX Default value=0xffffffff

#if 1

    pISR_USBD =(unsigned)IsrUsbd;     pISR_DMA2 =(unsigned)IsrDma2; #else     pISR_IRQ =(unsigned)IsrUsbd;      //Why doesn't it receive the big file if use this. (???)      //It always stops when 327680 bytes are received. #endif         ClearPending(BIT_DMA2);     ClearPending(BIT_USBD);     //rINTMSK&=~(BIT_USBD);          //pISR_FIQ,pISR_IRQ must be initialized }

//具体中断函数

void HaltUndef(void) {     Uart_Printf("Undefined instruction exception!!!\n");     while(1); }

 

自己从一开始 接触arm，就听说了中断 ，同时也见到了以上类似代码，准确来说可以追溯到去年暑假，至于在本科时也在教科书上好象见过就不说了，呵呵。一直没有搞明白到底是怎么回事，直到昨天晚上看到这个例子 ，再加上前段时间看了 c epert programing 对c语言有了进一步的了解，终于搞明白了。呵呵 回首往事 ，发现关键在于，以前不明白 同一个数 在左是址，在右是值，所以上面pISR_UNDEF=(unsigned)HaltUndef;是把HaltUndef地址值 存放到(*(unsigned *)(_ISR_STARTADDRESS+0x4))这个地址中 呵呵 现在 总算拨开云雾见天日，其他相关问题便迎任而解了