Hey,
I just want to make sure I'm reading this right. Did you just delete the
two mcasp sections in the .dtb file entirely? These two?
<http://imgur.com/U2MQK82>
On Tuesday, July 1, 2014 at 5:05:07 PM UTC-7, Spaced Cowboy wrote:
>
> Well, following up on my own post in case anyone finds this useful...
>
> I just tried deleting all references to mcasp{0,1} in
> /boot/am335x-boneblack.dts and on reboot, the pins that I wanted free are
> indeed free. This gives me
>
> P8:
>
> name pin mode 6 mode 5
>
>
> P8_11 13 out:0:r30:15
>
> P8_12 12 out:0:r30:14
>
> P8_15 15 in:0:r31:15
>
> P8_16 14 in:0:r31:14
>
>
> P9:
>
> P9_24 97 in:0:r31:16
>
> P9_26 96 in:1:r31:16
>
> P9_27 105 in:0:r31:5 out:0:r30:5
>
> P9_30 102 in:0:r31:2 out:0:r30:2
>
> P9_41 106 in:0:r31:6 out:0:r30:6
>
>
> P9_25 107 in:0:r31:7 out:0:r30:7
>
> P9_28 103 in:0:r31:3 out:0:r30:3
>
> P9_29 101 in:0:r31:1 out:0:r30:1
>
> P9_31 100 in:0:r31:0 out:0:r30:0
>
> P9_42 104 in:0:r31:4 out:0:r30:4
>
> giving the following pin configuration:
>
> in: PRU0: 0,1,2,3,4,5,6,7,14,15,16
>
> PRU1: 16
>
> out: PRU0: 14,15
>
> ... with the latter set of P9 pins being the ones released by not using
> mcasp. I can therefore set up two synchronous-data channels, one dedicated
> output (2-pin, clock and data) and one dedicated input (9-pin, clock and
> byte-wide data). If I can clock the input pins at ~20MHz, I have my 20
> MBytes/sec. I even have a couple of input pins left over spare :)
>
> My data needs are highly asymmetric (massive input, small output) so this
> suits me, and it stops me from needing to switch over the input/output
> configuration to get bi-directionality.
>
> Hope this helps someone. I'm sure there's a better way to disable the
> mcasp device, but I couldn't find it...
>
> Simon
>
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