codygu
December 9, 2021, 3:53am
1
Hello!
I try to get an external codec (MAX98357A) running on the Colibri i.MX6ULL module, but until now with no success.
When I try to play something using the aplay, the program gets stuck, but listing the devices seems to work
root@colibri-imx6ull:/usr/share/sounds/alsa# ls /dev/snd/
by-path controlC0 pcmC0D0p timer
root@colibri-imx6ull:~# aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
sysdefault:CARD=max98357a
max98357a,
Default Audio Device
In the device tree,I edit the imx6ull-colibri file, I have the following settings to use SAI2 as output
// SPDX-License-Identifier: (GPL-2.0 OR MIT)
/*
* Copyright 2018 Toradex AG
*/
#include "imx6ull.dtsi"
#include "imx6ull-colibri-lcdif.dtsi"
#include <dt-bindings/pwm/pwm.h>
/ {
aliases {
ethernet0 = &fec2;
ethernet1 = &fec1;
};
memory {
reg = <0x80000000 0x10000000>;
};
......
codec_ext: max98357a@0 {
compatible = "maxim,max98357a";
#sound-dai-cells = <0>;
};
sound {
compatible = "simple-audio-card";
simple-audio-card,name = "max98357a";
simple-audio-card,format = "i2s";
simple-audio-card,bitclock-master = <&dailink_master>;
simple-audio-card,frame-master = <&dailink_master>;
simple-audio-card,codec {
sound-dai = <&codec_ext>;
//clocks = <&clks IMX6UL_CLK_SAI2>;
};
dailink_master: simple-audio-card,cpu {
sound-dai = <&sai2>;
};
};
};
&sai2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_sai2>;
assigned-clocks = <&clks IMX6UL_CLK_SAI2_SEL>,
<&clks IMX6UL_CLK_SAI2>;
assigned-clock-parents = <&clks IMX6UL_CLK_PLL4_AUDIO_DIV>;
assigned-clock-rates = <0>, <36864000>, <589824000>;
fsl,sai-mclk-direction-output;
status = "okay";
};
......
&iomuxc {
imx6ull-colibri {
pinctrl_adc1: adc1grp {
fsl,pins = <
MX6UL_PAD_GPIO1_IO00__GPIO1_IO00 0x3000 /* SODIMM 8 */
MX6UL_PAD_GPIO1_IO01__GPIO1_IO01 0x3000 /* SODIMM 6 */
MX6UL_PAD_GPIO1_IO08__GPIO1_IO08 0x3000 /* SODIMM 4 */
MX6UL_PAD_GPIO1_IO09__GPIO1_IO09 0x3000 /* SODIMM 2 */
>;
};
......
pinctrl_sai2: sai2grp {
fsl,pins = <
MX6UL_PAD_JTAG_TDI__SAI2_TX_BCLK 0x17088
MX6UL_PAD_JTAG_TDO__SAI2_TX_SYNC 0x17088
MX6UL_PAD_JTAG_TRST_B__SAI2_TX_DATA 0x11088
>;
};
pinctrl_uart1_ctrl1: uart1-ctrl1-grp { /* Additional DTR, DCD */
fsl,pins = <
//MX6UL_PAD_JTAG_TDI__GPIO1_IO13 0x70a0 /* SODIMM 31 */
MX6UL_PAD_LCD_DATA18__GPIO3_IO23 0x10b0 /* SODIMM 29 */
//MX6UL_PAD_JTAG_TDO__GPIO1_IO12 0x90b1 /* SODIMM 23 */
MX6UL_PAD_LCD_DATA19__GPIO3_IO24 0x10b0 /* SODIMM 37 */
>;
};
pinctrl_gpio1: gpio1-grp {
fsl,pins = <
MX6UL_PAD_UART3_RX_DATA__GPIO1_IO25 0x10b0 /* SODIMM 77 */
MX6UL_PAD_JTAG_TCK__GPIO1_IO14 0x70a0 /* SODIMM 99 */
MX6UL_PAD_NAND_CE1_B__GPIO4_IO14 0x10b0 /* SODIMM 133 */
MX6UL_PAD_UART3_TX_DATA__GPIO1_IO24 0x10b0 /* SODIMM 135 */
MX6UL_PAD_UART3_CTS_B__GPIO1_IO26 0x10b0 /* SODIMM 100 */
//MX6UL_PAD_JTAG_TRST_B__GPIO1_IO15 0x70a0 /* SODIMM 102 */
MX6UL_PAD_ENET1_RX_ER__GPIO2_IO07 0x10b0 /* SODIMM 104 */
MX6UL_PAD_UART3_RTS_B__GPIO1_IO27 0x10b0 /* SODIMM 186 */
>;
};
}; /* imx6ull { */
};
If I now try to play some audio, I get the following error:
root@colibri-imx6ull:/usr/share/sounds/alsa# aplay Front_Right.wav
[ 670.576389] fsl-sai 202c000.sai: failed to derive required Tx rate: 1411200
[ 670.583621] fsl-sai 202c000.sai: ASoC: can't set 202c000.sai hw params: -22
ALSA lib ../../../alsa-lib-1.2.1.2/src/pcm/pcm_direct.c:1271:(snd1_pcm_direct_initialize_slave) unable to install hw params
ALSA lib ../../../alsa-lib-1.2.1.2/src/pcm/pcm_dmix.c:1101:(snd_pcm_dmix_open) unable to initialize slave
Hi @codygu , welcome to our Community. Could you share the codec schematic design so I can understand this issue better?
codygu
December 10, 2021, 4:49am
3
Hi @benjamin.tx ,following is the codec schematic design
Please try the following sound node in your device.
sound {
compatible = "simple-audio-card";
simple-audio-card,name = "max98357a";
simple-audio-card,format = "i2s";
simple-audio-card,bitclock-master = <&dailink_master>;
simple-audio-card,frame-master = <&dailink_master>;
simple-audio-card,cpu {
sound-dai = <&sai2>;
};
dailink_master: simple-audio-card,codec {
sound-dai = <&codec_ext>;
clocks = <&clks IMX6UL_CLK_SAI2>;
};
status = "okay";
};
codygu
December 14, 2021, 2:55am
5
Hi @benjamin.tx ,I tried the sound node.After compiling the device tree and re-burning,I get the following error:
root@colibri-imx6ull:~# aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
sysdefault:CARD=imx6ulmax98357a
imx6ul-max98357a,
Default Audio Device
root@colibri-imx6ull:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: imx6ulmax98357a [imx6ul-max98357a], device 0: 202c000.sai-HiFi HiFi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
root@colibri-imx6ull:~# aplay -vv test.wav
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Plug PCM: Rate conversion PCM (44100, sformat=S16_LE)
Converter: linear-interpolation
Protocol version: 10002
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 5760
period_size : 1920
period_time : 40000
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min : 1920
period_event : 0
start_threshold : 5760
stop_threshold : 5760
silence_threshold: 0
silence_size : 0
boundary : 1509949440
Slave: Direct Stream Mixing PCM
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 44100
exact rate : 44100 (44100/1)
msbits : 16
buffer_size : 5292
period_size : 1764
period_time : 40000
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min : 1764
period_event : 0
start_threshold : 5292
stop_threshold : 5292
silence_threshold: 0
silence_size : 0
boundary : 1387266048
Hardware PCM card 0 'imx6ul-max98357a' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 44100
exact rate : 44100 (44100/1)
msbits : 16
buffer_size : 5292
period_size : 1764
period_time : 40000
tstamp_mode : ENABLE
tstamp_type : MONOTONIC
period_step : 1
avail_min : 1764
period_event : 0
start_threshold : 1
stop_threshold : 1387266048
silence_threshold: 0
silence_size : 1387266048
boundary : 1387266048
appl_ptr : 0
hw_ptr : 0
#+ | 00%
codygu
December 14, 2021, 3:19am
6
When I enter cmd “alsamixer” ,the terminal shows “This sound device does not have any controls”
codygu
December 14, 2021, 3:25am
7
The following is boot log, I circled the error about the audio.
The reason AlsaMixer provides no control option is MAX98357 chip doesn’t come with any registry one can manipulate. Do you hear any sound when an audio file is played? Or you can even measure MAX98357’s output with an oscilloscope.
codygu
December 14, 2021, 7:30am
9
I hear no sound when an audio file is played.
root@colibri-imx6ull:~# aplay -vv test.wav
Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
.....
boundary : 1387266048
appl_ptr : 0
hw_ptr : 0
###+ | 05%^
``
The progress bar seems to be stuck there
Please post the entire system log by the command journalctl -b 0 . This command can be executed after aplay -vv test.wav. You may have to kill(ctrl+c) aplay -vv test.wav if it gets stuck.
codygu
December 14, 2021, 8:46am
11
Please view the attachment.log.txt (79.8 KB)
try to enable mclk pin for sai2 in the device tree.
codygu
December 14, 2021, 9:31am
13
Why? I did not connect this pin to Max98357a.How do I write the device tree？
codygu
December 14, 2021, 9:41am
14
Device Tree： add
MX6UL_PAD_JTAG_TMS__SAI2_MCLK 0x17088
under pinctrl_sai2: sai2grp
&iomuxc {
imx6ull-colibri {
......
pinctrl_sai2: sai2grp {
fsl,pins = <
MX6UL_PAD_JTAG_TDI__SAI2_TX_BCLK 0x17088
MX6UL_PAD_JTAG_TDO__SAI2_TX_SYNC 0x17088
MX6UL_PAD_JTAG_TRST_B__SAI2_TX_DATA 0x11088
MX6UL_PAD_JTAG_TMS__SAI2_MCLK 0x17088
>;
};
......
};
Is that？
codygu
December 15, 2021, 2:03am
15
Hi @benjamin.tx ， I tried to enable mclk pin, but still stuck.
yes. MX6UL_PAD_JTAG_TMS is used by backlight node in the default device tree if lcd is enabled.
codygu
December 15, 2021, 3:26am
17
It still dosen’t work.The test result is still the same as before.
codygu
December 15, 2021, 9:22am
18
I changed dts as following,but still unwork.
#include "imx6ull.dtsi"
#include "imx6ull-colibri-lcdif.dtsi"
#include <dt-bindings/pwm/pwm.h>
/ {
aliases {
ethernet0 = &fec2;
ethernet1 = &fec1;
};
memory {
reg = <0x80000000 0x10000000>;
};
......
codec_ext: max98357a@0 {
compatible = "maxim,max98357a";
#sound-dai-cells = <0>;
};
sound {
compatible = "simple-audio-card";
simple-audio-card,name = "max98357a";
simple-audio-card,format = "i2s";
simple-audio-card,bitclock-master = <&dailink_master>;
simple-audio-card,frame-master = <&dailink_master>;
simple-audio-card,codec {
sound-dai = <&codec_ext>;
};
dailink_master: simple-audio-card,cpu {
sound-dai = <&sai2>;
clocks = <&clks IMX6UL_CLK_SAI2>;
};
};
};
&sai2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_sai2>;
assigned-clocks = <&clks IMX6UL_CLK_SAI2_SEL>,
<&clks IMX6UL_CLK_SAI2>;
assigned-clock-parents = <&clks IMX6UL_CLK_PLL4_AUDIO_DIV>;
assigned-clock-rates = <0>, <12288000>;
fsl,sai-mclk-direction-output;
status = "okay";
};
......
&backlight {
status = "disabled";
};
&iomuxc {
imx6ull-colibri {
pinctrl_adc1: adc1grp {
fsl,pins = <
MX6UL_PAD_GPIO1_IO00__GPIO1_IO00 0x3000 /* SODIMM 8 */
MX6UL_PAD_GPIO1_IO01__GPIO1_IO01 0x3000 /* SODIMM 6 */
MX6UL_PAD_GPIO1_IO08__GPIO1_IO08 0x3000 /* SODIMM 4 */
MX6UL_PAD_GPIO1_IO09__GPIO1_IO09 0x3000 /* SODIMM 2 */
>;
};
......
pinctrl_sai2: sai2grp {
fsl,pins = <
MX6UL_PAD_JTAG_TDI__SAI2_TX_BCLK 0x17088
MX6UL_PAD_JTAG_TDO__SAI2_TX_SYNC 0x17088
MX6UL_PAD_JTAG_TRST_B__SAI2_TX_DATA 0x11088
MX6UL_PAD_JTAG_TMS__SAI2_MCLK 0x17088
>;
};
pinctrl_uart1_ctrl1: uart1-ctrl1-grp { /* Additional DTR, DCD */
fsl,pins = <
//MX6UL_PAD_JTAG_TDI__GPIO1_IO13 0x70a0 /* SODIMM 31 */
MX6UL_PAD_LCD_DATA18__GPIO3_IO23 0x10b0 /* SODIMM 29 */
//MX6UL_PAD_JTAG_TDO__GPIO1_IO12 0x90b1 /* SODIMM 23 */
MX6UL_PAD_LCD_DATA19__GPIO3_IO24 0x10b0 /* SODIMM 37 */
>;
};
pinctrl_gpio1: gpio1-grp {
fsl,pins = <
MX6UL_PAD_UART3_RX_DATA__GPIO1_IO25 0x10b0 /* SODIMM 77 */
MX6UL_PAD_JTAG_TCK__GPIO1_IO14 0x70a0 /* SODIMM 99 */
MX6UL_PAD_NAND_CE1_B__GPIO4_IO14 0x10b0 /* SODIMM 133 */
MX6UL_PAD_UART3_TX_DATA__GPIO1_IO24 0x10b0 /* SODIMM 135 */
MX6UL_PAD_UART3_CTS_B__GPIO1_IO26 0x10b0 /* SODIMM 100 */
//MX6UL_PAD_JTAG_TRST_B__GPIO1_IO15 0x70a0 /* SODIMM 102 */
MX6UL_PAD_ENET1_RX_ER__GPIO2_IO07 0x10b0 /* SODIMM 104 */
MX6UL_PAD_UART3_RTS_B__GPIO1_IO27 0x10b0 /* SODIMM 186 */
>;
};
}; /* imx6ull { */
};
