AD采集正弦波输出同频同相的方波。可是有错误，谁能把我看看。在下万分感谢。
#include  <msp430g2452.h>
double pingjun=0;
long caiyangzhi;
double caiyang ();
void main (void)
{
        WDTCTL = WDTPW + WDTHOLD;
        P1DIR &=~BIT0;
        P1SEL =BIT0;
   P2DIR=BIT2;
   P2OUT=0;

   __enable_interrupt();
   caiyang();

  while(1)
{
      ADC10CTL0 |= ENC + ADC10SC;             // Sampling and conversion start
    __bis_SR_register(CPUOFF + GIE);        // LPM0 with interrupts enabled
   if(caiyangzhi<pingjun+0.05 & caiyangzhi<pingjun+0.05)
     P2OUT ^= P2OUT;
    __no_operation();
}
}

double caiyang ()
{
  unsigned char i;
  ADC10CTL1=INCH_0+ADC10DIV_3;
  ADC10CTL0 = SREF_1 + ADC10SHT_3 + REFON + ADC10ON + ADC10IE;
  __delay_cycles(1000);
  ADC10CTL0 |= ENC + ADC10SC;
  __bis_SR_register(CPUOFF + GIE);
  caiyangzhi= ADC10MEM;
  for (i=0;i<1024;i++)
{
   pingjun += ADC10MEM;
   }
  pingjun=pingjun/10 ;
  return (pingjun);
}
// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR (void)
{
  __bic_SR_register_on_exit(CPUOFF);        // Return to active mode
} 此帖出自小平头技术问答