main.c

msp430的AD采样

#include  <msp430x14x.h>

void Init(void);

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  Init();
  
  P1DIR |= 0x01;                            // P1.0 output
  _EINT();
  for (;;)
  {
    ADC12CTL0 |= ADC12SC;                   // 启动第一次转换
    _BIS_SR(CPUOFF + GIE);                  // LPM0, ADC12_ISR will force exit
   }
}

// ADC12 interrupt service routine
#pragma vector=ADC_VECTOR
__interrupt void ADC12_ISR (void)
{   
   
    if (ADC12MEM0 < 0x7FF)
      P1OUT &= ~0x01;                       // Clear P1.0 
    else
      P1OUT |= 0x01;                        // Set P1.0 
    _BIC_SR_IRQ(CPUOFF);                    // Clear CPUOFF bit from 0(SR)
}                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     


//ADC12初始化
void Init(void)            
{
  ADC12CTL0&=~ENC;          //在改变设置前停止A/D转换
  P6SEL |= 0x01;         // P6.0为ADC option select
  ADC12CTL0=0x0210;
  ADC12CTL1=0x0200;      
                      //转换结果寄存器设置
  ADC12MCTL0=0x00;      //输入通道为A0
  ADC12IE=0x0001;      //A0转换结束允许中断
  ADC12CTL0|=ENC;       //允许转换
  
}