I am interfacing with a dsp that we have programmed and there are only options for slot widths of 16 or 32 bits but we are using a 24 bit data format. When I record using
arecord -v -f S32_LE -r 48000 -t wav -c4 /home/nyquist/test.wav
I get valid audio recording but the lower 8bits is 0 as would be expected. When I record using :
arecord -v -f S24_LE -r 48000 -t wav -c4 /home/nyquist/test.wav
I get garbage as it appears to be using 24bit wide tdm slots. My overlay is below and I have set what I believe are the correct slot configurations for the device. We have 4 channel input and one channel output 32bit slot width.
Any help would be greatly appreciated as I am sure I am missing something.
/dts-v1/;
/plugin/;
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/pinctrl/am33xx.h>
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/input/linux-event-codes.h>
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black", "ti,beaglebone-green";
/* identification */
part-number = "NQ-ASB-01";
version = "00A0", "A0";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
bone_audio_cape_audio_pins: pinmux_bone_audio_cape_audio_pins {
pinctrl-single,pins = <
0x190 (PIN_INPUT_PULLDOWN | MUX_MODE0) /* mcasp0_aclkx.mcasp0_aclkx */
0x194 (PIN_INPUT_PULLDOWN | MUX_MODE0) /* mcasp0_fsx.mcasp0_fsx, INPUT */
0x198 (PIN_INPUT_PULLDOWN | MUX_MODE0) /* mcasp0_axr0.mcasp0_axr0 */
0x19c (PIN_INPUT_PULLDOWN | MUX_MODE2) /* mcasp0_ahclkr.mcasp0_axr2 */
0x1ac (PIN_INPUT_PULLDOWN | MUX_MODE0) /* MCASP0_AHCLKX -> MCASP0_AHCLKX (I2S_MCLK_OUT)- in */
0x06c ( PIN_OUTPUT_PULLUP | MUX_MODE7 ) /* mcasp0_axr1 GPIO1_27 | OUTPUT | PULLUP */
>;
};
/* dsp SPI Pins */
bb_spi0_pins: pinmux_bb_spi0_pins {
pinctrl-single,pins = <
0x150 0x30 /* p84 spi0_sclk.spi0_sclk, INPUT_PULLUP | MODE0 */
0x154 0x30 /* p85 spi0_d0.spi0_d0, INPUT_PULLUP | MODE0 */
0x158 0x10 /* p86 spi0_d1.spi0_d1, OUTPUT_PULLUP | MODE0 */
0x15c 0x10 /* p87 spi0_cs0.spi0_cs0, OUTPUT_PULLUP | MODE0 */
>;
};
};
};
/* Relay Spi Interface */
fragment@1 {
target = <&spi0>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&bb_spi0_pins>;
ti,pio-mode; /* disable dma when used as an overlay, dma gets stuck at 160 bits... */
ti,pindir-d0-out-d1-in = <1>;
dspspi: channel@0 {
#address-cells = <1>;
#size-cells = <0>;
#sound-dai-cells = <0>;
compatible = "nq,dsp";
reg = <0>;
spi-max-frequency = <16000000>;
spi-cpha;
};
};
};
/* MCASP Interface */
fragment@2 {
target = <&mcasp0>;
__overlay__ {
#sound-dai-cells = <0>;
compatible = "ti,am33xx-mcasp-audio";
pinctrl-names = "default";
pinctrl-0 = <&bone_audio_cape_audio_pins>;
status = "okay";
op-mode = <0>; /* MCASP_IIS_MODE */
tdm-slots = <4>;
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>;
};
};
/*Sound Interface Config */
fragment@3 {
target-path="/";
__overlay__ {
sound {
compatible = "simple-audio-card";
simple-audio-card,name = "Nyquist Mixer DSP";
simple-audio-card,format = "dsp_a";
simple-audio-card,bitclock-master = <&sound_master>;
simple-audio-card,frame-master = <&sound_master>;
simple-audio-card,widgets =
"Line", "Line In";
simple-audio-card,cpu {
sound-dai = <&mcasp0>;
dai-tdm-slot-num = <4>;
dai-tdm-slot-width = <32>;
dai-tdm-slot-tx-mask = <1 0 0 0>;
dai-tdm-slot-rx-mask = <1 1 1 1>;
};
sound_master: simple-audio-card,codec {
sound-dai = <&dspspi>;
dai-tdm-slot-num = <4>;
dai-tdm-slot-width = <32>;
dai-tdm-slot-tx-mask = <1 0 0 0>;
dai-tdm-slot-rx-mask = <1 1 1 1>;
};
};
};
};
};
Ed McNicholas
Sr Embedded Engineer
[Bogen Signature Logo]<http://www.bogen.com/>
Bogen Communications, Inc.
3862 Quadrangle Blvd
Suite 150
Orlando, FL 32817
Direct: (201) 995-2087
Cell: (321) 217-5518
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