lm3s 把中断放在ram中，对NVIC_VTABLE赋值时错误

jomin

lm3s 把中断放在ram中，对NVIC_VTABLE赋值时错误 [复制链接]

1. void
   IntRegister(unsigned long ulInterrupt, void (*pfnHandler)(void))
   {
   unsigned long ulIdx, ulValue;
   
   //
   // Check the arguments.
   //
   ASSERT(ulInterrupt < NUM_INTERRUPTS);
   // Make sure that the RAM vector table is correctly aligned.
   //
   ASSERT(((unsigned long)g_pfnRAMVectors & 0x000003ff) == 0);
   
   //
   // See if the RAM vector table has been initialized.
   //
   if(HWREG(NVIC_VTABLE) != (unsigned long)g_pfnRAMVectors)
   {
   // Copy the vector table from the beginning of FLASH to the RAM vector
   // table.
   //
   ulValue = HWREG(NVIC_VTABLE);
   for(ulIdx = 0; ulIdx < NUM_INTERRUPTS; ulIdx++)
   {
   g_pfnRAMVectors[ulIdx] = (void (*)(void))HWREG((ulIdx * 4) +
   ulValue);
   }
   
   //
   // Point NVIC at the RAM vector table.
   //
   
   HWREG(NVIC_VTABLE) = (unsigned long )(g_pfnRAMVectors+8);
   }
   // Save the interrupt handler.
   g_pfnRAMVectors[ulInterrupt] = pfnHandler;
   }

复制代码

上面是函数 那个+8是我自己加上的，加和不加都一样，NVIC_VTABLE始终是20000380.

为什么