【YL-KL26Z】+ADC 偏移和校准

momososo · 发表于 2015-7-20 21:32:29

本帖最后由 momososo 于 2015-7-21 20:50 编辑

修改红字部分
修改ADC与GPIO demo学习偏移与校准的部分

while (1) {       vuint16 cal_var;
      Vout = adcGetUint();                                           /* 获取adc值                   */
      printf("Vout=%d\n",Vout);
      myDelay(100);
      if(!GPIO_GET_VALUE(MKL_PORTE,20))
      {
      GPIO_TOGGLE(MKL_PORTB,19);
      myDelay(500);             //去抖
      }
      if(!GPIO_GET_VALUE(MKL_PORTA,4))  //按K4偏移
      {
      ADC0_OFS += 100;
每按一次K4偏移值加100
但是输出的值是少200
写得不好，按着比较明显
      myDelay(500);             //去抖
      }
      if(!GPIO_GET_VALUE(MKL_PORTD,6))  //按K6校准
      {
         myDelay(500);             //去抖

         ADC0_SC3 |= ADC_SC3_AVGE_MASK; //依手册启用32点平均
         ADC0_SC3 |= ADC_SC3_AVGS(3);
         ADC0_CFG1 |= ADC_CFG1_ADIV(3); //减低ADC时钟

         ADC0_SC2 &= ~ADC_SC2_ADTRG_MASK; //改为软体触发
         ADC0_SC3 |= ADC_SC3_CAL_MASK; //启用校准
         while((ADC0_SC1(0) & ADC_SC1_COCO_MASK) != ADC_SC1_COCO_MASK); /* 等待转换完成 */
         if(ADC0_SC3 & ADC_SC3_CALF_MASK)
         {
            ADC0_SC3 &= ~ADC_SC3_CALF_MASK; //清除校准失败旗帜
         }

         /*校准正侧增益*/
         cal_var = 0x00;
         cal_var = ADC0_CLP0;
         cal_var += ADC0_CLP1;
         cal_var += ADC0_CLP2;
         cal_var += ADC0_CLP3;
         cal_var += ADC0_CLP4;
         cal_var += ADC0_CLPS;
         cal_var = cal_var/2;
         cal_var += 0x8000;

         ADC0_PG = cal_var;

         /*校准负侧增益*/
         cal_var = 0x00;
         cal_var = ADC0_CLM0;
         cal_var += ADC0_CLM1;
         cal_var += ADC0_CLM2;
         cal_var += ADC0_CLM3;
         cal_var += ADC0_CLM4;
         cal_var += ADC0_CLMS;
         cal_var = cal_var/2;
         cal_var += 0x8000;

         ADC0_MG = cal_var;

         ADC0_SC3 &= ~ADC_SC3_CAL_MASK;

         /*回复平均与时钟*/
         ADC0_SC3 &= ~ADC_SC3_AVGE_MASK;
         ADC0_SC3 &= ~ADC_SC3_AVGS_MASK;
         ADC0_CFG1 &= ~ADC_CFG1_ADIV_MASK;
      }
}
}
还是有点不懂
侦错时

ADC0_SC3 |= ADC_SC3_CAL_MASK; //启用校准
命令下完
OFS值会变动
但CAL旗帜马上又变回0
不是应该等命令下完才变回0吗

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