• State
  • Locked Locked
  • Replies 6 replies
  • Subscribers 99 subscribers
  • Views 963 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Noise when running mcaspPlayBk.c on LCDK C6748

Jose Fuentes
Prodigy 60 points

I compiled the mcasp example provided with StarterWare.  Then I connected an audio signal to the LCDK's input, and an amplifier to the output.  When the program is running there is a low frequency noise at the LCDK's output.  The ISRs are called correctly, and there is no error when starting a debug session.  Changing the #define lines at mcaspPlayBk.c alters the frequency of the noise.  Based on that I suppose there could be an audio buffers configuration issue.  What could be wrong?

Regards



board: LCDK C6748

emulator: XDS100v2

optimization level = 0

includes:

"C:\ti\C6748_StarterWare_1_20_03_03\include\"

"C:\ti\C6748_StarterWare_1_20_03_03\include\hw"

"C:\ti\C6748_StarterWare_1_20_03_03\include\c674x\c6748"

libraries:

"C:\ti\C6748_StarterWare_1_20_03_03\binary\c674x\cgt\c6748\system_config\Debug\system_config.lib"

"C:\ti\C6748_StarterWare_1_20_03_03\binary\c674x\cgt\c6748\lcdkC6748\platform\Debug\platform.lib"

"C:\ti\C6748_StarterWare_1_20_03_03\binary\c674x\cgt\c6748\drivers\Debug\drivers.lib"

---------------------------------------------------------------------------------------------


**** Build of configuration Debug for project starterware_passthrough ****

"C:\\ti\\ccsv5\\utils\\bin\\gmake" -k all
'Building file: ../mcaspPlayBk.c'
'Invoking: C6000 Compiler'
"C:/ti/ccsv5/tools/compiler/c6000/bin/cl6x" -mv6740 --abi=eabi -O0 -g --disable_push_pop --include_path="C:/ti/ccsv5/tools/compiler/c6000/include" --include_path="C:/ti/C6748_StarterWare_1_20_03_03/include/" --include_path="C:/ti/C6748_StarterWare_1_20_03_03/include/hw" --include_path="C:/ti/C6748_StarterWare_1_20_03_03/include/c674x/c6748" --define=c6748 --display_error_number --diag_warning=225 --preproc_with_compile --preproc_dependency="mcaspPlayBk.pp"  "../mcaspPlayBk.c"
'Finished building: ../mcaspPlayBk.c'
' '
'Building target: starterware_passthrough.out'
'Invoking: C6000 Linker'
"C:/ti/ccsv5/tools/compiler/c6000/bin/cl6x" -mv6740 --abi=eabi -O0 -g --disable_push_pop --define=c6748 --display_error_number --diag_warning=225 -z --stack_size=0x800 -m"starterware_passthrough.map" --heap_size=0x800 -i"C:/ti/ccsv5/tools/compiler/c6000/lib" -i"C:/ti/ccsv5/tools/compiler/c6000/include" --reread_libs --warn_sections --display_error_number --rom_model -o "starterware_passthrough.out"  "./mcaspPlayBk.obj" "./codecif.obj" "./aic31.obj" -l"libc.a" -l"C:\ti\C6748_StarterWare_1_20_03_03\binary\c674x\cgt\c6748\system_config\Debug\system_config.lib" -l"C:\ti\C6748_StarterWare_1_20_03_03\binary\c674x\cgt\c6748\lcdkC6748\platform\Debug\platform.lib" -l"C:\ti\C6748_StarterWare_1_20_03_03\binary\c674x\cgt\c6748\drivers\Debug\drivers.lib" "../C6748.cmd"
<Linking>
'Finished building target: starterware_passthrough.out'
' '

**** Build Finished ****

----------------------------------------------------------------------

C674X_0: Output:     Target Connected.
C674X_0: Output:     ---------------------------------------------
C674X_0: Output:     Memory Map Cleared.
C674X_0: Output:     ---------------------------------------------
C674X_0: Output:     Memory Map Setup Complete.
C674X_0: Output:     ---------------------------------------------
C674X_0: Output:     PSC Enable Complete.
C674X_0: Output:     ---------------------------------------------
C674X_0: Output:     PLL0 init done for Core:300MHz, EMIFA:25MHz
C674X_0: Output:     DDR initialization is in progress....
C674X_0: Output:     PLL1 init done for DDR:150MHz
C674X_0: Output:     Using DDR2 settings
C674X_0: Output:     DDR2 init for 150 MHz is done
C674X_0: Output:     ---------------------------------------------

  • 0
    TI__Mastermind 35645 points

    Hi Jose,

    Thanks for your post.

    Could you please provide the details below:

    1. What are the #define lines which are modified in mcaspPlayBk.c?

    Even I suppose, there could be audio buffer configuration issue but still i need to know, what are the #define parameters you changed so that, i simulate the usecase scenario and check appropriately.

    Kindly provide me the above details for more clarity and better understanding.

    ---------------------------------------------------------------------------------
    Please click the Verify Answer     button on this post if it answers your question.
    ---------------------------------------------------------------------------------

    Thanks & regards,

    Sivaraj K

  • 0 in reply to Sivaraj Kuppuraj
    Prodigy 60 points

    Hi Sivara,

    thanks for responding, I'm currently using the mcaspPlayBk.c file without modifications, changing NUM_SAMPLES_PER_AUDIO_BUF value didn't solve the problem.

    Regards

    /*
    ** Values which are configurable
    */
    /* Slot size to send/receive data */
    #define SLOT_SIZE                             (16u)

    /* Word size to send/receive data. Word size <= Slot size */
    #define WORD_SIZE                             (16u)

    /* Sampling Rate which will be used by both transmit and receive sections */
    #define SAMPLING_RATE                         (48000u)

    /* Number of channels, L & R */
    #define NUM_I2S_CHANNELS                      (2u)

    /* Number of samples to be used per audio buffer */
    #define NUM_SAMPLES_PER_AUDIO_BUF             (2000u)

    /* Number of buffers used per tx/rx */
    #define NUM_BUF                               (3u)

    /* Number of linked parameter set used per tx/rx */
    #define NUM_PAR                               (2u)

    /* Specify where the parameter set starting is */
    #define PAR_ID_START                          (40u)

    /* Number of samples in loop buffer */
    #define NUM_SAMPLES_LOOP_BUF                  (10u)

    /* AIC3106 codec address */
    #define I2C_SLAVE_CODEC_AIC31                 (0x18u)

    /* Interrupt channels to map in AINTC */
    #define INT_CHANNEL_I2C                       (2u)
    #define INT_CHANNEL_MCASP                     (2u)
    #define INT_CHANNEL_EDMACC                    (2u)

    /* McASP Serializer for Receive */
    #define MCASP_XSER_RX                         (14u)

    /* McASP Serializer for Transmit */
    #define MCASP_XSER_TX                         (13u)

  • 0 in reply to Jose Fuentes
    TI__Mastermind 35645 points

    Hi Jose,

    Thanks for your post.

    I understand the problem still persist.

    I would recommend you to configure McASP Serializer for Transmit and Receive  "#define" parameters as shown below:

    #define MCASP_XSER_RX

    #define MCASP_XSER_TX                        

    The above would help you to optimize your low frequency noise on the audio output.

    Please try to evaluate and Kindly let me know, how it responds.

    -------------------------------------------------------------------------------------------------------

    Please click the Verify Answer button on this post if it answers your question.
    --------------------------------------------------------------------------------------------------------

    Thanks & Regards,

    Sivaraj K

  • 0 in reply to Sivaraj Kuppuraj
    Prodigy 60 points

    Hi Sivaraj,

    documentation says MCASP_XSER_RX and MCASP_XSER_TX are the serializer numbers, in LCDK they are AXR13 and AXR14.

    I think maybe the problem is related to memory configuration (all the sections are in SHRAM).


    Regards

    Jose

  • 0 in reply to Jose Fuentes
    TI__Mastermind 35645 points

    Hi Jose,

    Thanks for your post.

    I do agree with you, there are chances of memory configuration issue.

    I would recommend you to map some internal memory (L1/L2 RAM/Cache) instead of mapping all in external memory (SDRAM).

    I hope, the above would help you to solve this issue.

    -----------------------------------------------------------------------------------------------------------
    Please click the     Verify Answer button on this post if it answers your question.
    ------------------------------------------------------------------------------------------------------------

    Thanks & regards,

    Sivaraj K

  • 0
    Prodigy 10 points

    Hi Jose,

    I think I'm running in your same issue.

    Have you found any solutions?

    Regards,

    Simone