DMA传输时可以在中断中更改地址吗？？？？？

可以啊，但是不会实时生效。

DMA工作的时候会先把size ,source address, dest address 先load到DMA内部缓存中去，实际运行时按缓存运行的。

所以你修改DMAxSA，DMAxDA 并不会影响到已经在进行的DMA动作中。会在下一次启动DMA的时候生效。

PS：DMA一般5个MCLK周期就完成了，很难通过中断正好卡到DMA周期内吧，你这样的应用的目的介绍一下呢？

建议提供下程序。

另外，你的实时性要求最大多少延迟？

程序是这样的    

#include "msp430f5529.h"

#include "HAL_PMM.h"

#include "variable.h"

#include "user.h"

unsigned int voice_data[256];

volatile int DMAdone=0;

void main()

{

    WDTCTL = WDTPW + WDTHOLD;

    P6SEL |= BIT4;

    P5SEL |= BIT2+BIT3;                       //P5.2 P5.3 选择XT2晶振功能

    P5SEL |= BIT7;                            //P5.7设定为TB1定时器输

    P5DIR |= BIT7;                            //P5.7设为输出

    P2DIR |= BIT2;                             //SMCLK 从P2.2输出

    P2SEL |= BIT2;

    P7DIR |= BIT7;                             //MCLK 从P7.7输出

    P7SEL |= BIT7;

    P7SEL |= BIT6;                            //定时器输出

    P7DIR |= BIT6;

    UCSCTL6 &= ~(XT2OFF);

    SetVCore(3);

    __bis_SR_register(SCG0);

    UCSCTL0 = DCO1+DCO2+DCO3+DCO4;

    UCSCTL1 = DCORSEL_5;

    UCSCTL2 = FLLD_3 + 5;

    UCSCTL3 = SELREF_5 + FLLREFDIV_3;

    UCSCTL4 = SELA_4 + SELS_3 + SELM_3;

    UCSCTL5 = DIVA_5 + DIVS_1;

    __bic_SR_register(SCG0);

    __delay_cycles(8192);

    do

    {

         UCSCTL7 &= ~XT1LFOFFG;

    }while (UCSCTL7&XT1LFOFFG);

    ADC12CTL0 = ADC12ON;

    ADC12MCTL0 = ADC12INCH_4;

    ADC12IFG = 0;

    ADC12CTL0 |= ADC12SHT0_6;

    ADC12CTL1 = ADC12SHS_3 + ADC12CONSEQ_2 + ADC12CSTARTADD_0 + ADC12SHP + ADC12SSEL_2 + ADC12DIV_5;

    ADC12CTL0 |= ADC12ENC;

    TBCCR0 = 1200;

    TBCCR1 = 200;

    TBCCTL1 = OUTMOD_7;

    TBCTL = TBSSEL_2 + MC_1 + TBCLR + ID_0;

    DMACTL0 = DMA0TSEL_24;

    DMACTL4 = DMARMWDIS;

    DMA0CTL &= ~DMAIFG;

    DMA0CTL = DMADT_4+DMAEN+DMADSTINCR_3+DMAIE;

    DMA0SZ = 256;

    __data16_write_addr((unsigned short) &DMA0SA,(unsigned long) &ADC12MEM0);

    __data16_write_addr((unsigned short) &DMA0DA,(unsigned long) buffer);

    __bis_SR_register(GIE); //使能全局中断

    __delay_cycles(380000);

    while(1)

    {

        __delay_cycles(374400);

    }

}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)

#pragma vector=DMA_VECTOR

__interrupt void DMA_ISR(void)

#elif defined(__GNUC__)

void __attribute__ ((interrupt(DMA_VECTOR))) DMA_ISR (void)

#else

#error Compiler not supported!

#endif

{

  switch(__even_in_range(DMAIV,16))

  {

    case 0: break;

    case 2:     // DMA0IFG = DMA Channel 0

     //__delay_cycles(2048);

     if(DMAnum%2==1)

     {

     __no_operation();

        __data16_write_addr((unsigned short) &DMA0DA,(unsigned long) &buffer);

        __no_operation();

     }

     if(DMAnum%2==0)

        {

     __no_operation();

         __data16_write_addr((unsigned short) &DMA0DA,(unsigned long) &voice);

         __no_operation();

     }

    DMAnum=DMAnum+1;

       __no_operation();

      break;

    case 4: break;                          // DMA1IFG = DMA Channel 1

    case 6: break;                          // DMA2IFG = DMA Channel 2

    case 8: break;                          // DMA3IFG = DMA Channel 3

    case 10: break;                         // DMA4IFG = DMA Channel 4

    case 12: break;                         // DMA5IFG = DMA Channel 5

    case 14: break;                         // DMA6IFG = DMA Channel 6

    case 16: break;                         // DMA7IFG = DMA Channel 7

    default: break;

  }

}

如果我将buffer作为目的地址   数据就会存储在voic数组中     情况就是这样    数据不会存储到设置的目的地址中