msp430f5438a遇到TimeA-CCR0捕获无法每次都触发DMA0传输的问题

 你的DMA配置好像有些问题。能否提供完整代码？

或者你参考一下官网的例程

www.ti.com/.../slac375

代码如下，参考你发的例程，做了修改

 CCRX_NUM = 50;

unsigned int CCR0Time[CCRX_NUM];

 unsigned long dmaAddr;

ChN = 0;

  memset(&CCR0Time,0,CCRX_NUM*2); 
  dmaAddr = (unsigned long) &CCR0Time[ChN];
  DMA0SZ = CCRX_NUM;
  __data16_write_addr((unsigned short) &DMA0SA,(unsigned long)(&TA0CCR0));                                    
  __data16_write_addr((unsigned short) &DMA0DA,dmaAddr); 
  DMACTL0 = DMA0TSEL_1;                      //(Ta0CCR0.IFG)
  DMACTL4 = DMARMWDIS ; 

  TA0CCTL0 = CM_3 + CCIS_0 + SCS + CAP;    //TA0.0捕获
  TA0CCTL0 &=~(COV + CCIFG);
  P1SEL |= BIT1;

 DMA0CTL = DMAEN + DMADT_0 + DMADSTINCR_3;   

等待1M信号过后，一般有50个左右个波形，查询寄存器CCR0Time，有时候有捕获数据，有时无捕获数据

DMA0CTL &= ~(DMAEN + DMAIFG);