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MSPM0G3507: ADC Sample time never changes total ADC conversion time

Philip Neaves
Prodigy 130 points
Part Number: MSPM0G3507

Tool/software:

Hello.

Setting up ADC conversion with sys cfg.

No matter what time I put in the desired sample time, the  total ADC  conversion time  - sample window + conversion window -  never changes.

The way I am testing (approximate conversion) time is:

DL_ADC12_enableConversions(ADC12_0_INST);

DL_ADC12_startConversion(ADC12_0_INST);
if((adc_status=DL_ADC12_getStatus(ADC12_0_INST)==0x01)) // test for busy bit
         count++;

Even with sample time of 100 us, count only ever gets to one.

Note from manual:

10.2.13 Status Register

The ADC status register, STATUS, contains two bits – REFBUFRDY and BUSY.

• •

REFBUFRDY is set when the ADC receives the ready signal from the internal reference buffer (VREF/ REFBUF) after asserting the enable request
BUSY equaling ‘1’ indicates that the ADC is busy performing a sample or convert operation

Two snips from sys cfg attached.

Thanks.

Phil

adc1.tiffadc2.tiff

  • +1
    TI__Mastermind 39685 points

    Hi,

    Can you share the configuration of ADC module on your project?

    I tried on my side. I modified the sample time and the total conversion frequency changes accordingly as expected. 

    Best regards,

    Cash Hao