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28035 ADC issue

thomas colinet
Prodigy 60 points

Hello everybody,

 

I'm sorry for my bad english. I'm actually  using a TMDXDOCK28035 and I'd like to to 3 ADC conversion on 3 different input. The code looks like this : 

Conv1 = AdcResult.ADCRESULT1 ;

Conv2 = AdcResult.ADCRESULT2;

Conv3 = AdcResult.ADCRESULT3;

 

The code seems to be good but when I use debug on TMDXDOCK28035 only one of the ADC input (A1) give me a good value for input between 0-3.3V this input give me 10-4095 so it's ok but the two other one give me value between 1400-1600. The result is never less than 1400 even if the input is 0V and never more than 1600 even if the input is 3.3V. 

 

I've also tried to change de input by for example AdcResult.ADCRESULT4, 5, 6.... but only A1(AdcResult.ADCRESULT2) give me a good value.

 

I wonder if i miss something in the configuration? Someone all ready had this problem?

 

Thanks a lot fort the help.

  • 0
    Prodigy 220 points

    It is not sufficient to simply read the result registers - you have to setup the ADC SOC registers to perform the conversions.

    At a minimum you'll need to set the ADCSOCxCTL CHSEL bits to the channel, the TRIGSEL bits to the trigger, and the ACQPS bits to the sample and hold windows size. 

    Each of the SOC's will store the conversion from whatever channel you program to the corresponding ADCRESULTx register.

    Consult spruge5a.pdf for details.