24 Feb
2012
24 Feb
'12
1:20 p.m.
On Fri, Feb 24, 2012 at 08:53:11AM +0100, javier Martin wrote:
In the piece of code I've shown to you, when someone configures (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF) he's really selecting an active high frame clock when the standard says just the opposite (wm8974 datasheet p50).
If I fixed the bug in the SSI I would break both of them, since I would be changing frame clock polarity.
No, with I2S the main effect of inverting the frame clock is to cause a left/right swap which is a relatively subtle issue, it's not obvious on an immediate listening test. It's not really active high or active low but rather indicating which channel the sample is.