CCS/CC2642R: ADC Buffer not Working with Breakpoints

Hi Jordan,

There is no such, known, limitations. Could I ask which SDK version and CCS version you are using?

CCS:  Version: 9.2.0.00013 

SDK: v:3.40.00.02

Thanks,

--Jordan

Hi Jordan,

I can't seem to re-produce this with the example project. Are you saying that if you put a breakpoint at the start of the "while(1)" that follows the convert call (the one with all the display logic), you never get there?

Have you done any other changes to the project, for example shifting modes or settings of the ADC?

Hi,

I reinstalled the default example and tried it on a different dev board but still was able to reproduce it every time by:

1) Running the software with no break points

2) Setting a breakpoint in adcBufCallback while the processor is running

You should see that you get output on the terminal until you hit the breakpoint.  If you hit "Resume" the breakpoint will never hit again and nothing is printed to the console.

Project I'm using

Where I put the breakpoint

The HWI it loops in

ROV when it's stuck

Hi Jordan,

This is due to the fact that you put the breakpoint down inside the callback. As a consequence of this (and general timings), the ADC could easily end up overflowing the FIFO which keeps the driver from clearing the ADC interrupt as it do not handle the overflow condition. 

I will file a bug report on this, in the mean while, try pulling in the ADCBuf driver source into the project and add the following lines inside the HWI function:

}

    /* Set activeSampleBuffer to primary as default */
    object->activeSampleBuffer = conversion->sampleBuffer;

    /* OVERFLOW WORKAROUND - We had an ADC overflow? */
    int32_t status = AUXADCGetFifoStatus();
    if (status & AUXADC_FIFO_OVERFLOW_M) {
        AUXADCFlushFifo();
    }

I tried the workaround but it did not fix the issue.  I am interested in being notified when the bug ticket is closed though.

Thanks,

--Jordan

Here is the modified file I used to test this out (it includes the additions which I made to be able to break inside the callback). Feel free to try it out.

If it does not work, try break-pointing in the Hwi function and step through it while looking at the ADCFIFO status register (it is found under AUX_ANAIF). It would be interesting to know what status it shows for you in the non working case

./cfs-file/__key/communityserver-discussions-components-files/538/ADCBufCC26X2.c