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Stereo Audio using alsa driver

Vineet
Intellectual 380 points
Other Parts Discussed in Thread: OMAP3530, OMAP-L137, TPS65930

Hi,

   I'm using the default kernel provided by TI. We are successful in enabling mono audio on omap3530 board by setting 1 for no of channels in snd_pcm_chanels. But when i try to switch to stereo using the snd_pcm_channels with 2 as no of channels, we are getting stereo but quality is very bad. How to improve the Audio quality.

 

Regards,

Vineet

  • 0
    TI__Mastermind 37340 points

    What version of the software are you using?  There were some audio quality limitations on Beta DVSDK that have been fixed in the current software release (Beta 2 DVSDK 3.00.00.29).

  • 0 in reply to Juan Gonzales
    Intellectual 280 points

    Hi All,

    I am in a need to write an Audio driver for OMAP3530.

    The OS running on OMAP3530 is my custom RTOS. I am now successfull in showing some bmp images through LCD panel. Now i wish to render an audio which will play in background when the images are shown.

    As i am very new to this field How should i begin to write an audio driver? Which chapter in technical reference manual will help me? Is there a sample code which gives all the configurations before rendering?

    Expecting help

     

    Regards

    Jack

  • 0 in reply to jack9310
    TI__Mastermind 25866 points

    I did this with OMAP-L137 Starter Kit so you might be able to do something similar. 

    Steps:

    1. Setup ALSA Sound Device Driver driver in kernal (building uImage) with menuconfig (I used /dev/dsp emulation just becase the apps for it are simpler)

    2. Found and built an audio app (wavplay) that would play out a .wav file (used /dev/dsp)

    I haven't tried on OMAP3 yet or tried actual ALSA without /dev/dsp.  But the above might get you started. 

     

  • 0 in reply to Joe G.
    Intellectual 390 points

    Hi,

     

    I am using TPS65930 PMIC for OMAP3530. Is it possible to support stereo headset out an d speaker out using Class-D ampliier  simultaneously?

     

    Regards,

    Murugan.M

  • 0 in reply to Murugan Mayileri
    TI__Expert 3400 points
    Hi, My customer has a very similiar question and I did not see it addressed directly in this post. We would like to drive an external Class D driver (stereo) as well as a headphone (mono) to 1/2W. Can the TPS69530 do this? thanks, Mark