So I wanted to make my own audio cape with 4 channels (and eventually 8).
Picture: https://dl.dropboxusercontent.com/u/82765462/BBB/4channel_audioCape.jpg
Right now I am running the clocks and i2s to a multichannel USB ADC/DAC
which is working great off AXR2.
A basic first step is I wanted to change the boardzoo audio cape to using
McASP_AXR3 by changing the device tree for BB-BONE-AUDI-02-00A0.dts from
AXR2 to AXR3.
First off the comments in the dts file seem incorrect in some cases but
thats ok, I got through it.
So I changed in the default dts file:
From:
/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P9.31", /* mcasp0: mcasp0_aclkx */
"P9.29", /* mcasp0: mcasp0_fsx */
* "P9.28", /* mcasp0: mcasp0_axr2 */*
"P9.25", /* mcasp0: mcasp0_ahclkx */
/* the hardware ip uses */
"gpio1_18", "gpio1_19",
"mcasp0";
To:
/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P9.31", /* mcasp0: mcasp0_aclkx */
"P9.29", /* mcasp0: mcasp0_fsx */
* "P9.27", /* mcasp0: mcasp0_axr3 */*
"P9.25", /* mcasp0: mcasp0_ahclkx */
/* the hardware ip uses */
"gpio1_18", "gpio1_19",
"mcasp0";
And the pinmux from:
bone_audio_cape_audio_pins: pinmux_bone_audio_cape_audio_pins {
pinctrl-single,pins = <
0x1ac 0x00 /* mcasp0_ahclkx, MODE0 | INPUT */
* 0x19c 0x22 /* mcasp0_axr2, */*
0x194 0x20 /* mcasp0_fsx, MODE0 | OUTPUT */
0x190 0x20 /* mcasp0_aclkr.mcasp0_aclkx, MODE0 | OUTPUT_PULLDOWN */
0x198 0x20
>;
To:
bone_audio_cape_audio_pins: pinmux_bone_audio_cape_audio_pins {
pinctrl-single,pins = <
0x1ac 0x00 /* mcasp0_ahclkx, MODE0 | INPUT */
* 0x1a4 0x22 /* mcasp0_axr3, */*
0x194 0x20 /* mcasp0_fsx, MODE0 | OUTPUT */
0x190 0x20 /* mcasp0_aclkr.mcasp0_aclkx, MODE0 | OUTPUT_PULLDOWN */
0x198 0x20
>;
Also changed the serializer from:
op-mode = <0>; /* MCASP_IIS_MODE */
tdm-slots = <2>;
num-serializer = <16>;
serial-dir = < /* 0: INACTIVE, 1: TX, 2: RX */
* 2 0 1 0*
0 0 0 0
0 0 0 0
0 0 0 0
>;
tx-num-evt = <1>;
rx-num-evt = <1>;
};
To:
op-mode = <0>; /* MCASP_IIS_MODE */
tdm-slots = <2>;
num-serializer = <16>;
serial-dir = < /* 0: INACTIVE, 1: TX, 2: RX */
* 2 0 0 1*
0 0 0 0
0 0 0 0
0 0 0 0
>;
tx-num-evt = <1>;
rx-num-evt = <1>;
};
};
*Original
file: https://dl.dropboxusercontent.com/u/82765462/BBB/BB-BONE-AUDI-02-00A0.dts*
*AXR2 to AXR3 changes outlined
above:
https://dl.dropboxusercontent.com/u/82765462/BBB/BB-BONE-AUDI-02-00A0swap.dts*
Then I simply did:
*cd /lib/firmware*
*dtc -O dtb -o BB-BONE-AUDI-02-00A0.dtbo -b 0 -@ BB-BONE-AUDI-02-00A0swap.dts*
And reboot.
When I play audio though it still comes out the old AXR2 i2s!!!
Eventually I want both AXR2 and AXR3 so I can get 2 stereo channels output.
Then eventually 6 channels, 8 etc... what HDMI intended...
Anyways! Wondering where I went wrong in the device tree before I start
mucking with tlv320aic3x.c, davinci-mcasp.c and davinci-evm.c
Thanks in advance!
-Jesse
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