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TMDSLCDK138: TMDSLCDK138

Carlos Granados
Prodigy 50 points
Part Number: TMDSLCDK138

Hi,

I purchased from the TI store  the TMDSLCDK138 board for a DSP class and after running a basic input sound  test, I could not hear that sound on the corresponding output channel. I used standard stereo jack cables and cd player. I confirmed with an stectrum analyzer that no output was comming from that channel.

Case CS0234062 

ticsc.service-now.com/csm

Thank you,

  • 0
    TI__Guru** 114410 points

    Carlos,

    Can you please indicate what code are you running on the DSP for performing the audio loopback. I would recommend using MCASP functional audio loopback to test the base loopback. 

    Please describe your software setup so we can provide appropriate guidance with your setup.

    Regards,

    Rahul 

  • 0 in reply to Rahul Prabhu
    Prodigy 50 points

    Hi,Rahul

    • SET UP 1: I run the  MCASP functional audio loopback using CSSv9 in another PC with similar setup: only pin 5 and 8 on, and XDS100v2 Jtag. However,  the results were the same, I could only hear 1 channel out of the 2 from the music player played from the stereo cd and cables. Also with no response of that channel from the spectrum analyzer.

    This is an update for the BSL function L138_initialise_intr()NOTICE_INITIALISE_INTR.pdf

    We also used Dr. Reay's code (LCDK_files_CCSv5.zip ) from his book "Digital Signal Processing and Applications with the OMAP - L138 eXperimenter". The link for his SDK is:

    ftp://ftp.wiley.com/public/sci_tech_med/signal_processing

    And we used CCSv6 with a JTAG XDS100v2. We used pins for UART2 (2 and 4 on) and the last pin on for GPIO. Every other pin is off.

    A test is located on "\LCDK\L138_chapter2\". Loop back test would be projects L138_loop_poll, and L138_loop_intr

    Here are the Dr. Reay's tests:

    I attempted to share the executables but it is restricted. 

    Thanks

  • 0 in reply to Rahul Prabhu
    Prodigy 50 points

    Hi, Rahul 

    Since both tests fails including MCASP functional audio loopback to test the base loopback and I contacted customer service regarding this issue, they want you to determined if the board is eligible for refund / replacement.

    Thank you,

    Carlos

  • 0 in reply to Carlos Granados
    TI__Mastermind 27355 points

    Hi Carlos,

    Could you please try running the McASP loopback example in Processor SDK? The BSL software that you referenced above is legacy software that is no longer being maintained. The McASP example in Processor SDK is regression tested and would help us rule out any software related issues. 

    Instructions on creating the CCS projects for the driver examples can be found here: 

    http://software-dl.ti.com/processor-sdk-rtos/esd/docs/latest/rtos/index_device_drv.html#id194

    If you have any questions please let me know.

    Regards,
    Sahin

  • 0 in reply to Sahin Okur
    Prodigy 50 points

    Hi 

    Sahin Ohur, Yes,

    I run the  MCASP functional audio loopback, and the results were the same to the legacy tests. I could only hear 1 channel out of the 2 from the music played from the stereo cd and cables. The spectrum analyzer confirms only 1 channel works.

    What could I expect?

    Regards,

    Carlos

  • 0 in reply to Carlos Granados
    TI__Guru* 78455 points

    Carlos

    Sorry for the delay , both Rahul and Sahin are out this week.

    If you feel you have done enough to ensure that there are no software issues and you have not damaged the board due to improper handling, please initiate a return request using the following web form

    https://www.ti.com/support-quality/additional-information/customer-returns.html

    Regards

    Mukul 

  • 0 in reply to Carlos Granados
    TI__Guru** 114410 points

    Please ensure that you are using Line in and not mic in for the input. Another reason it may appear to be single channel may be because the ADC is providing 16 bit data and the MCASP is configured to receive 2 -16 bit data on a single slot rather than two separate time slots for left and right channel data. the data on the scope will look like single 32 bit data or single channel because the data is packed.

    Can you please post the scope shots that makes you believe that there is only one channel. 

  • 0 in reply to Rahul Prabhu
    Prodigy 50 points

    Yes, I have used both the Line in and the loop back test is configured for the MCASP (2-16 bits) 32 bits data.


    The first picture is a snapshot of the spectrum of both channels with not test running, but it shows only noise. No program is running.

    During stereo mode. The 2nd picture is a snapshot of the spectrum of both channels during the playback loop test. Only one channel has responded during the reading of the spectrum. Similarly occurs with the speakers that only one speaker out of the two sounds with music.