[求助] 新手不懂：中断进入很慢

绵里针 2012-11-5 09:33 楼主

我使用仿真器调试下面程序时进入中断很慢，而且需要按下全速运行后再按停止，反复几次后才能进到SD24的中断里面，不知什么原因，请大神指教。
#include "msp430afe253.h"
#define Num_of_Results 8

/* Arrays to store SD24 conversion results */
unsigned int Ch0results[Num_of_Results];
unsigned int Ch1results[Num_of_Results];
unsigned int Ch2results[Num_of_Results];

void main(void)
{
  volatile unsigned int i;                // Use volatile to prevent removal
                                          // by compiler optimization

  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  P1DIR |= BIT0+BIT1;                      // Set P1.0, P1.1 to output
  SD24CTL = SD24REFON + SD24SSEL0;       // 1.2V ref, SMCLK
  SD24CCTL0 |= SD24GRP+SD24DF;             // Group with CH1
  SD24CCTL1 |= SD24GRP+SD24DF;             // Group with CH2
  SD24CCTL2 |= SD24IE+SD24DF;             // Enable interrupt
  for (i = 0; i < 0x3600; i++);          // Delay for 1.2V ref startup

  SD24CCTL2 |= SD24SC;                   // Set bit to start conversion
  __bis_SR_register(GIE);    // Enter LPM0 w/ interrupts
  while(1);
}

#pragma vector=SD24_VECTOR
__interrupt void SD24AISR(void)
{
   static unsigned int index = 0;

   switch (SD24IV)
   {
   case 2:                                  // SD24MEM Overflow
      break;
   case 4:                                  // SD24MEM0 IFG
      break;
   case 6:                                  // SD24MEM1 IFG
      break;
   case 8:                                  // SD24MEM2 IFG
      Ch0results[index] = SD24MEM0;          // Save CH0 results (clears IFG)
      Ch1results[index] = SD24MEM1;          // Save CH1 results (clears IFG)
      Ch2results[index] = SD24MEM2;          // Save CH2 results (clears IFG)
      P1OUT ^=BIT0;
      if (++index == Num_of_Results)
      {
      index = 0;                         // SET BREAKPOINT HERE
      P1OUT ^=BIT1;
      }
      break;
   }
}
我用的是MSP430AFE253，用SBW接口传输。谢谢了。