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Original question:

MSP432E401Y: Multiple adc sequencer with multiple channels

MSP432E401Y: ADCBuf_convertCancel on multiple sequencers on same ADC Module only stops conversion for one sequencer

Sean_
Intellectual 560 points
Part Number: MSP432E401Y

When using two sequencers on the same adc module, I am able to sample continuous data similar to adcBufMultiSequencer example.  However, once I call ADCBuf_convertCancel I notice that only sequencer 0 stops conversion and thus does not generate any further call backs to adcBufCallback function.  The second sequecer 1 continues to generate callbacks.

This is the code for the convertCancel function:

    //Stops all conversions in progress (stops callback also)
    if(ADCBuf_convertCancel(adcBuf)!= ADCBuf_STATUS_SUCCESS) {
            /* Did not stop conversion process correctly. */
            while(1);
        }

This takes the adcBuf handle which is the same for both sequencer 0 and sequencer 1 as they are on the same ADC module.

How do I stop conversions, and thus the adcCallBacks, from the sequencer 1?

 I can determine which sequencer is making the call back as the parameter "completedChannel" specifies the channel that is completed making the call backs.

  • 0
    TI__Mastermind 20210 points

    Hi,

    I have to reproduce this on my side. Can you send me the ADC settings you are using?

    Thanks,

  • 0 in reply to FI
    Intellectual 560 points

    Here are the settings:

        ADCBuf_Params_init(&adcBufParams);
    adcBufParams.callbackFxn = adcBufCallback;
    adcBufParams.recurrenceMode = ADCBuf_RECURRENCE_MODE_CONTINUOUS;
    adcBufParams.returnMode = ADCBuf_RETURN_MODE_CALLBACK;
    adcBufParams.samplingFrequency = 10000;
    adcBuf = ADCBuf_open(Board_ADCBUF0, &adcBufParams);

    /* Configure HW Averaging */
    ADCHardwareOversampleConfigure(ADC0_BASE,2);

    I setup the continousconversions struct (code not shown.)  Then start each sequencer as such:

        /* Start converting ADC0 sequencer 0. */
    if (ADCBuf_convert(adcBuf, continuousConversion_ADC0Seq0, 8) !=
        ADCBuf_STATUS_SUCCESS) {
        /* Did not start conversion process correctly. */
        while(1);
    }

    /* Start converting ADC0 sequencer 1. */
    if (ADCBuf_convert(adcBuf, continuousConversion_ADC0Seq1, 2) !=
        ADCBuf_STATUS_SUCCESS) {
        // Did not start conversion process correctly.
        while(1);
    }


    Then when I want to stop conversion I call this function:

        //Stops all conversions in progress (stops callback also)
    if(ADCBuf_convertCancel(adcBuf)!= ADCBuf_STATUS_SUCCESS) {
            /* Did not stop conversion process correctly. */
            while(1);
        }

    I also went back and edited my original question since I accidentally put two sequencers on same channel.  To be clear I have two sequencers on different channels but are using the same ADC Module.

    Thanks.

  • 0 in reply to Sean_
    Intellectual 560 points

    Hi,


    Were you able to duplicate this issue or do you need any additional information?

    Thanks,


    Sean

  • 0 in reply to Sean_
    TI__Mastermind 20210 points

    Hi Sean,

    I was able to replicate the issue and am looking into this.

    Thanks,

  • 0 in reply to FI
    TI__Mastermind 20210 points

    Hi Sean,

    I have asked MSP432 experts to look into this.

    Thanks

  • 0 in reply to FI
    Intellectual 560 points

    Thank you.

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