rt：我想用定时器去控制AD数据采集，但是没有达到理想结果，我首先用TB定时10ms，然后再TB的中断服务程序里面启动TA，给TA赋初值300us，TA的终端里面开启AD并给TA重新装入100us的值，到100us后关掉AD，程序编译没有问题，但是我运行的时候tbcounter和f1的数值比j的值要大4倍多，原则上应该几个值是一样的，在线等 #include <msp430x14x.h> void InitSys(void)                      //初始化系统时钟
{
 unsigned int iq0;
 _DINT();                                //关中断
 BCSCTL1 &=~XT2OFF;
   do
   {
      IFG1 &= ~OFIFG;   // 清除振荡器失效标志
      for (iq0 = 0xFF; iq0 > 0; iq0--); // 延时，等待XT2起振
   }
   while ((IFG1 & OFIFG) != 0);  // 判断XT2是否起振 
   BCSCTL2 =SELM1+SELS;                 // MCLK,SMCLK时钟为XT2,8M
  /* DCOCTL = 0XFF;
   BCSCTL1 = RSEL2 + RSEL1 + RSEL0;*/
   //BCSCTL2 = SELM0;
  
} void delay(void)
{
  int i;
  for(i=0;i<1000;i++);
}
void Init_ad(void) //初始化AD
{
  P6SEL |= 0x08;//A3
  ADC12CTL0 =  ADC12ON +SHT0_0 + REFON ;                  //+ MSC;//内核打开，采样保持定时定器， 
  ADC12CTL1 = SHP+ ADC12SSEL_2 + CSTARTADD_3+ CONSEQ_0  ; //MCLK,单通道多次转换，采样来自采样定时器，转换存储地址为mem3
  ADC12MCTL3 = SREF_1 + INCH_3;                           //Vr+=AREF+,VR-=AVSS;
  ADC12CTL0 |= ENC;                                       //使能转换
  ADC12IE = 0X08;                                         //允许a3中断
  delay();
} void Init_ta(void)                            //初始化定时器A
{
  CCTL0 = CCIE;                               //允许CCR0中断
  CCR0 = 0;//300us
  //CCTL1 = CCIE;
  //CCR1 = 5000;
  TACTL = TASSEL_2  + TACLR + ID_1 ;         //选择系统主时钟8M，2分频，定时器清零，增记数模式
 
} void Init_tb(void)                                //初始化定时器B
{
  TBCCTL0 = CCIE;
  TBCCR0 = 40000;                                  //10ms
  TBCTL = TBSSEL_2 + TBCLR   + MC_1 + ID_1;        //MCLK8M/2,clear,
 
} unsigned int result=0;
int ReadArray[400]={0};
int Aver[100]={0};
double sum=0;
unsigned int m,n; int tbcounter=0;
int ta1=0; int j=0;
int i=0;
int f1=0; int k=0;
int counter=0;
long int ADcounter=0;
int flag;
int tempkey;
void main(void)
{
   WDTCTL = WDTPW + WDTHOLD;
  
   P5DIR = BIT4 + BIT5 + BIT7;
   P5SEL = BIT4 + BIT5;
  
  
   InitSys();
   Init_ad();
   Init_ta();
   Init_tb();
  
   P5OUT =0X00;//open ad627
   //ADC12CTL0 = ADC12ON;//open ad
   _EINT(); //开总中断
   flag = 0;
 
   while(1)
   {
     if(flag==1)
     {
      // P5OUT = 0X80;
     ADC12CTL0 |= ADC12SC;
     }
      if(ADcounter==11)
  {
     ADC12CTL0 &= ~ADC12SC;
    Aver[j++]=sum/11;
    ADcounter=0;
    sum=0;
  }
   }
   //m=ADcounter&0XFFFF;
   // n=(ADcounter>>16)&0XFFFF;
   // n=m*1500/4096;
}
#pragma vector = ADC_VECTOR
__interrupt void ADC12ISR(void)
{
  sum+=ADC12MEM3;
  ADcounter++;
 
 
}
#pragma vector = TIMERA0_VECTOR
__interrupt void TIMER_A(void)
{
  counter++;
 if(counter==2)
 {
   //P5OUT = 0X80;
  //  ADC12CTL0 |= ADC12SC;
   flag = 1;
   CCR0 = 400;
   f1++;
 }
 if(counter==3)
 {
   flag=0;
   P5OUT = 0X00;
   //TBCTL ^= MC_1;
   TACTL ^=MC_1;    counter=1;
 }
 
}
 

#pragma vector = TIMERB0_VECTOR
__interrupt void Timer_B(void)
{
   P5OUT = 0X80;
      CCR0=1200;
      tbcounter++;
             TACTL += MC_1;
}
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