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PCM2704C volume control

Kai Hsiao
Guru 12675 points
Other Parts Discussed in Thread: PCM2704C, PCM2704

Dear Sir

I use 3pcs of PCM2704C on my computer and it will have three sets of volume control group, but the HID can't control independently, If I control HID of "A" PCM2704C and than "C" PCM2704C will be louder but "A" PCM2704C's volume still keep original status 

How can I control each of PCM2704C's volume independently?

 

Thanks   

  • 0
    TI__Guru**** 189399 points

    Hi, Kai,

    I've asked my colleague to work with you on this next week.

    -d2

  • 0
    TI__Guru 51366 points

    Please elaborate what (and how) you are exactly doing.

    Do you use UI controls from Windows or are you actually writing your own software to control the volume of each PCM2704?

    The PCM2704's, if attached through a hub to a PC, will not be aware of each other but will be controlled by the Windows sound subsystem and the Windows USB class audio driver. If the volume changes for all of them (not just for the one that was addressed, something is wrong on the Windows side (if you wrote your own program, please make sure that you have a unique (and correct) file handle to each PCM2704C.

  • 0 in reply to Dominik Hartl11
    Guru 12675 points

    Dear Sir

    Thanks for your reply quickly 

    OK!! I will check the elaborate system structure and feedback the information on Monday

    Our OS : Windows XP

    Driver : PCM2704C TI website driver 

    If the 3pcs of PCM2704C through someone's USB Hub to control and the system OS is Window's ,this issue can't be solved ,is it right?

    Thanks 

  • 0 in reply to Dominik Hartl11
    Guru 12675 points

    Dear Sir

    The system's structure is below

    OS : Windows XP

    Without use any UI

    Just use Mediaplayer to play music and control HID directly 

    Have any solution could solve this issue ?

  • 0 in reply to Kai Hsiao
    TI__Guru 51366 points

    Each PCM2704 should enumerate with a unique file handle and the windows sound subsystem should be able to control separate volume. If you write your own software, I recommend making sure that you have unique handles to each PCM2704 and to set the volume for each separately.

  • 0 in reply to Kai Hsiao
    Expert 1720 points

    It probably doesn't have a good solution. Windows and also Linux doesn't have mechanism for pairing HID control with the volume control. You must have software which can understand individual HID controls and also individual volume controls. I don't know about any software which can do it.