MSP430F5438 ADC12加快问题

2019-03-24 14:59发布

先描述一下情况:我在做一个ADC12的使用,原先扫描的数据为32(行)*24(列)*50(帧),采用的ADC12配置为12位精度,采样256个时钟,序列单次扫描,代码如下:  P6SEL = 0x81;                                   // Enable A/D channel A0/A7
  ADC12CTL0 = ADC12ON+ADC12MSC+ADC12SHT0_8;
  ADC12CTL1 = ADC12SHP+ADC12CONSEQ_1+ADC12SSEL1 ; // Use sampling timer, single sequence
                                                  // ADCCLK=MCLK,NO DIV 
  ADC12MCTL0 = ADC12INCH_0;                       // ref+=AVcc, channel = A0
  ADC12MCTL1 = ADC12INCH_7+ADC12EOS;              // ref+=AVcc, channel = A1
  ADC12IE = 0x02;                                 // Enable ADC12IFG.1
  ADC12CTL0 |= ADC12ENC;                          // Enable conversions; 以上代码未发现异常;   现在需要把他改成32(行)*24(列)*240(帧),因为以后实际用的是64(行)*32(列)*60(帧)的结构,以及预留;   于是我把ADC12精度改成8位,采样时钟设置成8个时钟; 配置代码如下:  P6SEL = 0x81;                                   // Enable A/D channel A0/A7
  ADC12CTL0 = ADC12ON+ADC12MSC+ADC12SHT0_1;
  ADC12CTL1 = ADC12SHP+ADC12CONSEQ_1+ADC12SSEL1 ; // Use sampling timer, single sequence
                                                  // ADCCLK=MCLK,NO DIV 
  ADC12CTL2 = ADC12RES_0;                           //选择AD分辨率,8位 
  ADC12MCTL0 = ADC12INCH_0;                       // ref+=AVcc, channel = A0
  ADC12MCTL1 = ADC12INCH_7+ADC12EOS;              // ref+=AVcc, channel = A1
  ADC12IE = 0x02;                                 // Enable ADC12IFG.1
  ADC12CTL0 |= ADC12ENC;                // Enable conversions   出现了以下现象:  当ADC12SHT0_x,即采样保持时钟,x<4时,明显观察到了干扰,即通道0的电平明显干扰到了通道1; 现在,想请教一下,是否有比较好的方法,能减少这种干扰呢?   谢谢
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shushu
2019-03-25 09:20

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