Linux/TLV320AIC3100: arecord fails with lower bitrates like 16000hz

azeem bukhari

Part Number: TLV320AIC3100

Tool/software: Linux

Hi,

I am using the AM335x Custom Board.

I have an issue with arecord functionality.
I am able to record with higher rates, say 44100hz. but when it comes to lower rates it fails.

ie,

"arecord --device=plughw:0,0 --format S16_LE --rate 44100 -c1 --duration=5 test.wav" works fine. I have verified the playback. Other higer bitrates too.

but when it comes to
"arecord --device=plughw:0,0 --format S16_LE --rate 16000 -c1 --duration=5 test.wav", the recording finishes before even 1-second timeout and all I can hear is a noise.

What can be the issue behind recording of lower rates ? I am able to play a sample 16000hz audio. but not record.

_____________________________________________________________________________________________________________
root@azeem-:~# cat /etc/asound.conf
pcm.!default {
type plug
slave {
pcm "hw:0,0"
}
}

ctl.!default {
type hw
card 0
}
___________________________________________________________________________________________________

**** List of PLAYBACK Hardware Devices ****
card 0: PLAYERU [PLAYERU], device 0: Playback tlv320aic31xx-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
root@azeem-:~#
___________________________________________________________________________________________________

over 6 years ago

0 azeem bukhari over 6 years ago

Prodigy 180 points

If i give the record duration more i can see this.

"overrun!!! (at least 16.177 ms long)
overrun!!! (at least 39.360 ms long)"

0 Steve-Wilson over 6 years ago in reply to azeem bukhari

TI__Mastermind 30210 points

Azeem,

from the Codec side I don't see a reason why this would be the case. The TLV320AIC3100 evm allows for 16khz sample rate without issue.
Let me look in the AM335x team to help support. Im not familiar enough with this board to be able to comment much on this.

-Steve wilson

0 Pavel Botev over 6 years ago in reply to azeem bukhari

TI__Guru**** 170625 points

Azeem,

Do you use AM335x TI PSDK Linux? If yes, which version?

Regards,
Pavel

0 azeem bukhari over 6 years ago in reply to Pavel Botev

Prodigy 180 points

Yes,

version : 4.1.18+gitAUTOINC+bbe8cfc1da-r22c

Regards
Azeem

0 Pavel Botev over 6 years ago in reply to azeem bukhari

TI__Guru**** 170625 points

Azeem,

This is linux kernel version. I need the version of the PSDK that you are using. The latest version is 5.01

Regards,
Pavel

0 azeem bukhari over 6 years ago in reply to Pavel Botev

Prodigy 180 points

Pavel,

I am sorry i forgot to paste the details.

ti-processor-sdk-linux-am335x-evm-04.01.00.06

processor-sdk-linux-02.00.02

Regards,
Azeem

0 azeem bukhari over 6 years ago in reply to azeem bukhari

Prodigy 180 points

Hi Pavel Botev ,

Do you have an update on this ?

Thanks and Regards
Azeem

0 Pavel Botev over 6 years ago in reply to azeem bukhari

TI__Guru**** 170625 points

Azeem,

I tested 16KHz arecord on the AM335x StarterKit board and it works fine. I also check AM335x McASP user guide and I see that 16KHz is supported sample rate:

processors.wiki.ti.com/.../AM335x_Audio_Driver's_Guide

Can you provide me the console output you have with verbose option enabled? Below is what I have:

Fullscreen arecord_16k.txt Download

root@am335x-evm:~# arecord --device=plughw:0,0 --format S16_LE --rate 16000 -c1 --duration=20 test_16K.wav -v
Recording WAVE 'test_16K.wav' : Signed 16 bit Little Endian, Rate 16000 Hz, Mono
Plug PCM: Route conversion PCM (sformat=S16_LE)
  Transformation table:
    0 <- 0*0.5 + 1*0.5
Its setup is:
  stream       : CAPTURE
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 1
  rate         : 16000
  exact rate   : 16000 (16000/1)
  msbits       : 16
  buffer_size  : 8000
  period_size  : 2000
  period_time  : 125000
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 2000
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 8000
  silence_threshold: 0
  silence_size : 0
  boundary     : 2097152000
Slave: Hardware PCM card 0 'AM335x-EVMSK' device 0 subdevice 0
Its setup is:
  stream       : CAPTURE
  access       : MMAP_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 16000
  exact rate   : 16000 (16000/1)
  msbits       : 16
  buffer_size  : 8000
  period_size  : 2000
  period_time  : 125000
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 2000
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 8000
  silence_threshold: 0
  silence_size : 0
  boundary     : 2097152000
  appl_ptr     : 0
  hw_ptr       : 0
root@am335x-evm:~# ls -al test_16K.wav 
-rw-r--r--    1 root     root        640044 Oct  6 02:14 test_16K.wav
root@am335x-evm:~#

Can you also provide me your DTS file for review?

Meanwhile you can check if the below pointers will be in help:

If there’s an issue:

- In case of XRUN (under or overrun)

- ALSA period size must be aligned with the FIFO depth (tx/rx numevt)

Silicon errata, Advisory 1.0.38 McASP: McASP to EDMA Synchronization Level Event Can Be Lost

Regards,
Pavel

0 azeem bukhari over 6 years ago in reply to Pavel Botev

Prodigy 180 points

Hi Pavel,

Thanks for your faster response.

Here is the information you have asked for. Before that with the above "asound.conf" file, i was facing issue with the playback of 16000hz bitrates. So, I have modified the file which is now able to play the 16000hz bitrate but still no fortune on the recording side. I have attached my latest "asound.conf".

Please see the attached files.

1. arecord output.

Fullscreen 0753.arecord_veribose.txt Download

root@azeem-:/download/home/root# arecord --device=plughw:0,0 --format S16_LE --rate 16000 -c1 --duration=20 test_16K.wav -v
Recording WAVE 'test_16K.wav' : Signed 16 bit Little Endian, Rate 16000 Hz, Mono
Plug PCM: Rate conversion PCM (11025, sformat=S16_LE)
Converter: libspeex (external)
Protocol version: 10002
Its setup is:
  stream       : CAPTURE
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 1
  rate         : 16000
  exact rate   : 16000 (16000/1)
  msbits       : 16
  buffer_size  : 7999
  period_size  : 1999
  period_time  : 124988
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 1999
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 7999
  silence_threshold: 0
  silence_size : 0
  boundary     : 2096889856
Slave: Route conversion PCM (sformat=S16_LE)
  Transformation table:
    0 <- 0*0.5 + 1*0.5
Its setup is:
  stream       : CAPTURE
  access       : MMAP_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 1
  rate         : 11025
  exact rate   : 11025 (11025/1)
  msbits       : 16
  buffer_size  : 5512
  period_size  : 1378
  period_time  : 124988
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 1378
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 5512
  silence_threshold: 0
  silence_size : 0
  boundary     : 1444937728
Slave: Hardware PCM card 0 'PLAYERU' device 0 subdevice 0
Its setup is:
  stream       : CAPTURE
  access       : MMAP_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 11025
  exact rate   : 11025 (11025/1)
  msbits       : 16
  buffer_size  : 5512
  period_size  : 1378
  period_time  : 124988
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 1378
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 5512
  silence_threshold: 0
  silence_size : 0
  boundary     : 1444937728
  appl_ptr     : 0
  hw_ptr       : 0
overrun!!! (at least 6.604 ms long)
Status:
  state       : XRUN
  trigger_time: 416.581207132
  tstamp      : 0.000000
  delay       : 2002
  avail       : 5997
  avail_max   : 7996
overrun!!! (at least 6.759 ms long)
Status:
  state       : XRUN
  trigger_time: 416.897735465
  tstamp      : 0.000000
  delay       : 2002
  avail       : 5997
  avail_max   : 7996
overrun!!! (at least 7.137 ms long)
Status:
  state       : XRUN
  trigger_time: 417.214377965
  tstamp      : 0.000000
  delay       : 2002
  avail       : 5997
  avail_max   : 7996
overrun!!! (at least 6.548 ms long)
Status:
  state       : XRUN
  trigger_time: 417.531381757
  tstamp      : 0.000000
  delay       : 2002
  avail       : 5997
  avail_max   : 7996
root@azeem-:/download/home/root

2. dts file trimmed

Fullscreen 2728.trimmed_dts_file.txt Download

..
..
..
..
sound1 {
                compatible = "ti,playeru-audio-revb";
                ti,model = "PLAYERU";
                ti,audio-codec = <&tlv320aic3100>;
                ti,mcasp-controller = <&mcasp1>;
                ti,codec-clock-rate = <24000000>;
                ti,audio-routing =
                        "Headphone Jack",       "HPL",
                        "Headphone Jack",       "HPR",
                        "MIC1RP", "Mic Jack",
                        "MIC1RP", "MICBIAS";
        };
};
..
..
playeru_audio_pins: pinmux_playeru_audio_pins {
                pinctrl-single,pins = <
                        0x10C ( PIN_OUTPUT_PULLDOWN | MUX_MODE4 )  /* gmii1_crs.mcasp1_aclkx */
                        0x110 ( PIN_OUTPUT_PULLDOWN | MUX_MODE4 )  /* gmii1_rxer.mcasp1_fsx */
                        0x128 ( PIN_OUTPUT_PULLDOWN | MUX_MODE3 ) /* gmii1_txd0.mcasp1_axr2 */
                        0x144 ( PIN_INPUT | MUX_MODE4 )           /* rmii1_refclk.mcasp1_axr3 */
                        /* Codec Interrupt and Reset pin */
                        0x150 ( PIN_INPUT | MUX_MODE7 ) /*  spi0_sclk.gpio0[2] */
                        0x154 ( PIN_INPUT_PULLDOWN | MUX_MODE7 ) /* (B18) spi0_d0.gpio0[3] */
                >;
        };
..
..
i2c1_pins_default: pinmux_i2c1_pins_default {
                pinctrl-single,pins = <
                        0x180 (PIN_INPUT_PULLUP | MUX_MODE3)    /* uart1_txd.i2c1_sda */
                        0x184 (PIN_INPUT_PULLUP | MUX_MODE3)    /* uart1_rxd.i2c1_scl */
                >;
        };
..
..

&i2c1 {
        pinctrl-names = "default", "sleep";
        pinctrl-0 = <&i2c1_pins_default>;
        pinctrl-1 = <&i2c1_pins_sleep>;

        status = "okay";
        clock-frequency = <100000>;

        tlv320aic3100: tlv320aic3100@18 {
                compatible = "ti,tlv320aic310x";
                reg = <0x18>;
                status = "okay";
                gpio-reset= <&gpio0 3 GPIO_ACTIVE_LOW>;
                ai31xx-micbias-vg = <0x2>;
                /* Regulators */
                HPVDD-supply = <&ldo4_reg>;
                SPRVDD-supply = <&ldo4_reg>;
                SPLVDD-supply = <&ldo4_reg>;
                AVDD-supply = <&ldo4_reg>;
                IOVDD-supply = <&ldo4_reg>;
                DVDD-supply = <&ldo4_reg>;
        };
};
..
..
..
&mcasp1 {
                pinctrl-names = "default", "sleep";
                pinctrl-0 = <&playeru_audio_pins>;
                pinctrl-1 = <&playeru_audio_pins_sleep>;

                status = "okay";

                op-mode = <0>;          /* MCASP_IIS_MODE */
                tdm-slots = <2>;
                /* 4 serializers */
                serial-dir = <  /* 0: INACTIVE, 1: TX, 2: RX */
                        0 0 1 2
                >;
                tx-num-evt = <32>;
                rx-num-evt = <32>;
};

3. asound.conf file

Fullscreen 7610.asound.conf.txt Download

pcm.!default {
        type plug
        slave.pcm "dmixer"
}

pcm.dmixer  {
        type dmix
        ipc_key 1024
        slave {
                pcm "hw:0,0"
                period_time 0
                period_size 1024
                buffer_size 4096
                rate 44100
        }
        bindings {
                0 0
                1 1
        }
}

ctl.dmixer {
        type hw
        card 0
}

Thanks and Regards

Azeem

0 Pavel Botev over 6 years ago in reply to azeem bukhari

TI__Guru**** 170625 points

Azeem,

You stated that you are using ti-processor-sdk-linux-am335x-evm-04.01.00.06. This PSDK version comes with kernel 4.9.41. Can you double check the version of the PSDK you are using? Because kernel 4.1.18 comes with PSDK 2.00.02

Also in your arecord_veribode.txt file I see that sample rate change from 16000 to 11025, which is not supported by the McASP audio driver. You should measure with scope what frequency exactly you have on the mcasp1_fsx pin during the 16KHz arecord usecase.

Regards,
Pavel

0 azeem bukhari over 6 years ago in reply to Pavel Botev

Prodigy 180 points

Pavel,

Sorry about the confusion again.
Yes, we are using processor-sdk-linux-02.00.02.

Thanks and Regards
Azeem

0 Pavel Botev over 6 years ago in reply to azeem bukhari

TI__Guru**** 170625 points

Azeem,

I check asound.conf file in processor-sdk-linux-02.00.02, and it is empty file. Asoundrc (or asound.conf) is a configuration file that is not technically needed for audio to work in linux, but it is a powerful tool to tailor to the audio needs of a specific system. Routing and sample-rate conversion are examples of properties that can be configured through Asoundrc.
AM335x EVM and StarterKit audio works fine with an empty asound.conf file. What differences between your board and TI boards need to be hadles in asound.conf file? For more info regarding this file check below pointers:

processors.wiki.ti.com/.../Sitara_SDK_Linux_Audio_ALSA_User_Space
www.alsa-project.org/.../Asoundrc

Also in your DTS file I see below line:

compatible = "ti,playeru-audio-revb";

While on AM335x TI boards we have:

compatible = "ti,da830-evm-audio";

This "ti,da830-evm-audio" points to linux-kernel/sound/soc/davinci/davinci-evm.c file, where AIC3x (AIC3106) codec is handled. Make sure you have modified your davinci-evm.c for your AIC3100 codec. See also below wiki page:

processors.wiki.ti.com/.../Sitara_Linux_Audio_Porting_Guide
processors.wiki.ti.com/.../Sitara_Linux_Audio_DAC_Example

I would also suggest you to measure frame sync and bit clock pins and verify your have the correct and expected clock frequencies on these pins.

Regards,
Pavel

0 Pavel Botev over 6 years ago in reply to Pavel Botev

TI__Guru**** 170625 points

If you have no more questions related to the subject of the e2e thread, please close/verify/resolve this thread.

Regards,
Pavel

Audio

Audio forum

Linux/TLV320AIC3100: arecord fails with lower bitrates like 16000hz