AnsweredAssumed Answered

kl25z

Question asked by Yihan Jiang on Mar 17, 2016
Latest reply on Mar 18, 2016 by Yihan Jiang

I am using FRDM-KL25Z development board. I found to read multi channel ADC, I have to read it twice to get the correct data. Seems like the result register didn't get updated for the first read. The issues cannot be exposed when reading single channel.

Here is the example,

     ADC0_SC1A = ADC_SC1_ADCH(8);

     rd1 = ADC0_RA;

     while (ADC0_SC2 & ADC_SC2_ADACT_MASK);

     while(!(ADC0_SC1A & ADC_SC1_COCO_MASK));

 

     ADC0_SC1A = ADC_SC1_ADCH(8);

     rd1 = ADC0_RA;

     while (ADC0_SC2 & ADC_SC2_ADACT_MASK);

     while(!(ADC0_SC1A & ADC_SC1_COCO_MASK));

I have to do the same algorithm twice. Anybody else got the same issue?

Did I miss anything here?

Btw, I am using Keil uVision as IDE. Thanks.

Outcomes