Re: [alsa-devel] USB asynchronous mode feedback format

On Fri, 2010-10-15 at 14:08 +0200, Julian Scheel wrote:

Besides my I2S/DAC troubles, I still seem to have some problem with the async mode. Actually my buffers are permanently overflowing (not slightly, but very extreme). So far I do not regulate the feedback data, but send a constant value of 48 - As I expect 48 samples per USB frame.

So my data is (48<<13):

char data[4];
data[0] = 0x00;
data[1] = 0x06;
data[2] = 0x00;
data[3] = 0x00;

AUDDSpeakerDriver_WriteFeedback(data, 4,
                (TransferCallback)FeedbackSent,
                NULL);

Whenever the feedback was sent (ie it was queried by the host), this method is called again and it sends the feedback again. Is this ok in general or is there some basic problem with this feedback style?

UAC data should be Big Endian. Send the LSB byte first.

Alex