[alsa-devel] how to use mcbsp for i2s?

Jarkko Nikula jhnikula at gmail.com
Sat Apr 4 16:39:37 CEST 2009

On Fri, 3 Apr 2009 10:14:45 -0600
Ernesto Torres <skullmate at gmail.com> wrote:

> Im getting this output from muxing:
> MUX: setup AF6_3430_MCBSP3_DX (0xd800216c): 0x0004 ->
> 0x0000
> MUX: setup AE6_3430_MCBSP3_DR (0xd800216e): 0x0004 ->
> 0x0000
> MUX: setup AF5_3430_MCBSP3_CLKX (0xd8002170): 0x0004 ->
> 0x0000
> MUX: setup AE5_3430_MCBSP3_FSX (0xd8002172): 0x0004 -> 0x0000
> Is this correct?
It look likes since debug output says that the muxmode for those pins
are changed from mode 4 (gpio in this case) to 0 (McBSP3 pins in
this case).

Actually all of those pins are configured as outputs in muxing module
point of view but IRCC actually McBSP HW will set the direction
depending on its configuration. At least I didn't notice any
difference what was the muxing direction when I was playing with them
shortly some time ago.


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