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DSKDA830 audio board error (INT0)

George Mastrogiannis
Prodigy 10 points
Other Parts Discussed in Thread: OMAP-L137

We are using the OMAP-L137/DSKDA830 Multichannel Audio Board add-on for the OMAP-L137 Evaluation kit. We have previously tested this board and successfully passed audio in and out, but now the board is hanging during software tests.

The first observed change is that upon powering up the board after connecting the USB, the red LED labeled INT0/DS4 remains lit.

When running the dc_audio test code as provided on the Spectrum Digital DSKDA830 Support page (http://support.spectrumdigital.com/boards/dskda830/revf/) using Code Composer Studio v4.2, the run freezes during the initialization/ready phase of dc_audio_tone.c, lines 108-115, at the first "dummy write" MCASP check (commented "check for Tx ready"). The test was repeated on multiple computers with the same results.

When repeating the audio test with the audio board disconnected from the evaluation board, the test program works normally with the DSP board's integrated audio. No significant issues are encountered when the audio board is disconnected.

Furthermore, when the audio board is connected, the onboard audio test code (aic3106) hangs at the equivalent instruction, despite working when the audio board is disconnected.

We have been unable to find documentation concerning the purpose of the error light or troubleshooting for this issue, and have been unable to diagnose any possible causes for these problems.

Thank you,

George Mastrogiannis

Team SIGMA // Rice University ECE

  • 0
    TI__Genius 14545 points

    George,

     

    George Mastrogiannis said:
    We have previously tested this board and successfully passed audio in and out, but now the board is hanging during software tests.

           So did the audio card work with the same test before? or are these a different set of tests you are running all together. The Audio card is pretty robust, and I can assure you that audio signals from the Multi Channel Board will not be the root cause of the code hanging up.

     

    George Mastrogiannis said:
    When repeating the audio test with the audio board disconnected from the evaluation board, the test program works normally with the DSP board's integrated audio. No significant issues are encountered when the audio board is disconnected.

    Furthermore, when the audio board is connected, the onboard audio test code (aic3106) hangs at the equivalent instruction, despite working when the audio board is disconnected.

       I'm not familiar with the Spectrum Digital test code, however I would recommend that you check to make sure the audio card doesn't throw any of the mux's on the OMAP-L137 board. When the audio card is connected, I believe it will trigger some of the Mux IC's on the board to switch to a different input.  Typically the AIC test code was written given the default electrical connections on the OMAPL137 board (as a stand alone board), and doesn't make provisions for if another board, such as the UI board or the Audio Card is plugged in.

     

    George Mastrogiannis said:
    We have been unable to find documentation concerning the purpose of the error light or troubleshooting for this issue, and have been unable to diagnose any possible causes for these problems.


       These types of questions are typically answer by looking at the schematics. Since it's and LED, you should be able to determine what signals turn it on and off, and from there trace back to find what is causing the signal to turn the LED on.