430f5418内部ad12采样不稳定，怎么办

只看该作者 · 2013-7-23 23:14

用430内部ad12采样信号，如果在输入短路感觉挺好的，为什么有信号输入就不稳定呢？我只能通过使用很多的采集做平均来弥补，速度太慢了。请求高手解答。

只看该作者 · 2013-7-23 23:14

P6SEL |= 0xFF;                         // Enable A/D channel A0
  P6DIR &= 0x00;

  REFCTL0 |= REFMSTR + REFVSEL_2 + REFON;
  /* Initialize ADC12_A */
  ADC12CTL0 = ADC12ON+ADC12MSC+ADC12SHT0_2; // Turn on ADC12, set sampling time
  ADC12CTL1 = ADC12SHP+ADC12CONSEQ_1;    // Use sampling timer, single sequence

  ADC12MCTL0 = ADC12SREF_1+ADC12INCH_0;                // ref+=AVcc, channel = A0
  ADC12MCTL1 = ADC12SREF_1+ADC12INCH_1;                // ref+=AVcc, channel = A1
  ADC12MCTL2 = ADC12SREF_1+ADC12INCH_2;                // ref+=AVcc, channel = A1
  ADC12MCTL3 = ADC12SREF_1+ADC12INCH_3;                // ref+=AVcc, channel = A1
  ADC12MCTL4 = ADC12SREF_1+ADC12INCH_4;                // ref+=AVcc, channel = A1
  ADC12MCTL5 = ADC12SREF_1+ADC12INCH_5;                // ref+=AVcc, channel = A1
  ADC12MCTL6 = ADC12SREF_1+ADC12INCH_6;                // ref+=AVcc, channel = A1
  ADC12MCTL7 = ADC12SREF_1+ADC12INCH_7+ADC12EOS;                // ref+=AVcc, channel = A1

  ADC12CTL0 |= ADC12ENC;                   // Enable conversions
  delay_us(100);