新手学习msp430f5310，关于dma问题

#include <msp430.h>

unsigned int ADC_Result[512];
unsigned int i = 0;
int main(void)
{

  WDTCTL = WDTPW | WDTHOLD;                 // Stop WDT
   P6SEL = BIT1;
  // Configure ADC10 - pulse sample mode; software trigger; 
  ADC10CTL0 = ADC10SHT_2 | ADC10ON | ADC10MSC; // 16ADCclks, ADC on
  ADC10CTL1 = ADC10SHP | ADC10CONSEQ_2;     // pulse sample mode, rpt single ch
  ADC10CTL2 = ADC10RES;                     // 10-bits of re;solution
  ADC10MCTL0 = ADC10INCH_1;                 // AVCC ref, A1
  
  // Configure DMA (ADC10IFG trigger)
  DMACTL0 = DMA0TSEL_24;                    // ADC10IFG trigger
  __data16_write_addr((unsigned short) &DMA0SA,(unsigned long) &ADC10MEM0);
                                            // Source single address  
  __data16_write_addr((unsigned short) &DMA0DA,(unsigned long) &ADC_Result[0]);
                                            // Destination array address  
  DMA0SZ = 512;                              // 64 conversions 
  DMA0CTL = DMADT_4 | DMADSTINCR_3 | DMAEN | DMAIE; // Rpt, inc dest, word access, 
                                            // enable int after 64 conversions  
  while(1)
  {
    ADC10CTL0 |= ADC10ENC | ADC10SC;        // Sampling and conversion start
    __bis_SR_register(CPUOFF | GIE);        // LPM0, ADC10_ISR will force exit
    
    i++;
    
 }  
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=DMA_VECTOR
__interrupt void DMA0_ISR (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(DMA_VECTOR))) DMA0_ISR (void)
#else
#error Compiler not supported!
#endif
{
  switch(__even_in_range(DMAIV,16))
  {
    case  0: break;                         // No interrupt
    case  2: 
      // sequence of conversions complete
      __bic_SR_register_on_exit(CPUOFF);
      ADC10CTL0 &= ~ADC10ENC;               // Disable ADC conversion
      P4OUT ^= BIT3;
      break;                                // DMA0IFG
    case  4: break;                         // DMA1IFG
    case  6: break;                         // DMA2IFG
    case  8: break;                         // Reserved
    case 10: break;                         // Reserved
    case 12: break;                         // Reserved
    case 14: break;                         // Reserved
    case 16: break;                         // Reserved
    default: break; 
  }   
}

这是代码