没有采集到数据

2万 · 2015-4-17 22:14

void main(void)
{

      WDTCTL = WDTPW + WDTHOLD;
      // Stop watchdog timer to prevent time out reset
      if (CALBC1_8MHZ == 0xFF || CALDCO_8MHZ == 0xFF)
      {
         while(1); // If calibration constants erased, trap CPU!!
      }
      // Configure Basic Clock
      BCSCTL1 = CALBC1_8MHZ;    // Set range
      DCOCTL = CALDCO_8MHZ; // Set DCO step + modulation*/

      ADC10CTL0= ADC10ON+REFON+ADC10SHT_3+MSC+ADC10IE+SREF_1;
      ADC10CTL1= CONSEQ_3+INCH_10;
      ADC10CTL0&=~ADC10IFG;

      _EINT();//打开中断
      __delay_cycles(10);
      while(1)
      {
      while (ADC10CTL1 & BUSY);// Wait if ADC10 core is active
      ADC10SA = 0x200;       // Data buffer start
   ADC10CTL0 |= ENC+ADC10SC;//使能转换并且开始转换
   __delay_cycles(1);
   display();
      }
}
#pragma vector=ADC10_VECTOR
__interrupt void ADC10ISR(void)
{
      char index=0;
      int i;
      results[index++]=ADC10MEM;
      if(index==NUM)
      {
            unsigned long sum,real;
            index=0;
            for(i=0;i<NUM;i++)
            {
                     sum+=results[i];
            }
            sum>>=5;       //除以32求平均值
            real=((1.5*sum/1023)-0.986)/0.00355;//扩大1000倍
            data_temp[3]=real/1000;                                     //千位
            data_temp[2]=(real%1000)/1000;                      //百位
            data_temp[1]=real%100/10;                               //十位
            data_temp[0]=real%10;                                     //个位
            __delay_cycles(10);
            //display();

      }
      ADC10CTL0&=~ADC10IFG;//清除中断标志
}

2万 · 2015-4-17 22:15

while (ADC10CTL1 & BUSY);// Wait if ADC10 core is active
当把这一栏注释掉时
数码管都显示0，没有采集到数据，不知道为什么挂死在这里

只看该作者 · 2015-4-17 22:15

可以参考如下例程：

//******************************************************************************
//  MSP430F20x2 Demo - ADC10, Sample A1, AVcc Ref, Set P1.0 if > 0.5*AVcc
//
//  Description: A single sample is made on A1 with reference to AVcc.
//  Software sets ADC10SC to start sample and conversion - ADC10SC
//  automatically cleared at EOC. ADC10 internal oscillator times sample (16x)
//  and conversion. In Mainloop MSP430 waits in LPM0 to save power until ADC10
//  conversion complete, ADC10_ISR will force exit from LPM0 in Mainloop on
//  reti. If A1 > 0.5*AVcc, P1.0 set, else reset.
//
//             MSP430F20x2
//          -----------------
//       /|\|             XIN|-
//       | |                |
//       --|RST       XOUT|-
//          |                |
//       >---|P1.1/A1    P1.0|-->LED
//
//  L. Westlund
//  Texas Instruments Inc.
//  May 2006
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include "msp430x20x2.h"

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  ADC10CTL0 = ADC10SHT_2 + ADC10ON + ADC10IE; // ADC10ON, interrupt enabled
  ADC10CTL1 = INCH_1;                      // input A1
  ADC10AE0 |= 0x02;                      // PA.1 ADC option select
  P1DIR |= 0x01;                         // Set P1.0 to output direction

  for (;;)
  {
ADC10CTL0 |= ENC + ADC10SC;          // Sampling and conversion start
__bis_SR_register(CPUOFF + GIE);       // LPM0, ADC10_ISR will force exit
if (ADC10MEM < 0x1FF)
   P1OUT &= ~0x01;                      // Clear P1.0 LED off
else
   P1OUT |= 0x01;                      // Set P1.0 LED on
  }
}

// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
  __bic_SR_register_on_exit(CPUOFF);       // Clear CPUOFF bit from 0(SR)
}