nvidia nano平台麦克风I2S调试2

1.  前言
2.  查看调试节点
3. 分析录音问题
4.  I2S4编解码器主模式控件

1. 前言

承接上篇
https://www.ebaina.com/articles/140000012929

2. 查看调试节点

alsactl init tegrasnd210ref 
=> “alsactl: init:1776: Cannot find soundcard ‘tegrasnd210ref’…”

arecord -D hw:tegrasnd210ref,0 -c 1 -r 44100 -f S16_LE -d 10 cap.wav 
=> ALSA lib pcm_hw.c:1713:(_snd_pcm_hw_open) Invalid value for card
arecord: main:788: audio open error: No such device

echo 0 | sudo tee /sys/kernel/debug/tracing/trace => 0
echo 0 | sudo tee /sys/kernel/debug/tracing/events/enable => 0
echo 1 | sudo tee /sys/kernel/debug/tracing/tracing_on => 1
echo 1 | sudo tee /sys/kernel/debug/tracing/events/asoc/snd_soc_dapm_widget_power/enable => 1

arecord -D hw:tegrasnd210ref,0 -c 1 -r 44100 -f S16_LE -d 10 cap.wav 
     => ALSA lib pcm_hw.c:1713:(_snd_pcm_hw_open) Invalid value for card
arecord: main:788: audio open error: No such device

sudo cat /sys/kernel/debug/tracing/trace =>

 tracer: nop
#
# entries-in-buffer/entries-written: 0/0   #P:4
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |

之前声卡名字里漏掉了一个t

$ alsactl init tegrasndt210ref
$ arecord -D hw:tegrasndt210ref,0 -c 1 -r 44100 -f S16_LE -d 10 cap.wav

仍然得到了一些噪音
就像在Audacity的例子中一样
注意到录音的速度非常快——接近1秒，而不是正常的10秒
音频文件持续时间- 10秒
所以尝试通过直接测量来估计SCK频率-它在我的示波器上接近20MHz
(Samplerate FS = 44100hz)

命令

$arecord -D hw:tegrasndt210ref,0 -c 1 -r 8000 -f S16_LE -D 100 cap.wav 

产生Fsck = 3.3Mhz，
其他类似:

FS=11025 => Fsck = 4.5MHz, FS=22050 => Fsck = 8.9-9Mhz

认为这不是正常值

3. 分析录音问题

如果在较短的时间内捕获10秒的音频，
那么它可能是以下两种情况之一……
Jetson I2S没有配置为master
音频没有按照预期从I2S接口路由，DMA将捕获样本

（1）对于#1，默认情况下Jetson是I2S主服务器
可以通过设备树或通过适当的混频器控制进行修改
可以通过…检查混频器控制
$ amixer -c tegrasndt210ref cget name="I2S4 Codec Master Mode"

（2）对于#2，可以通过查看输出
(现在已经纠正了soundcard的名称)

$ echo 0 | sudo tee /sys/kernel/debug/tracing/trace
$ echo 0 | sudo tee /sys/kernel/debug/tracing/events/enable
$ echo 1 | sudo tee /sys/kernel/debug/tracing/tracing_on
$ echo 1 | sudo tee /sys/kernel/debug/tracing/events/asoc/snd_soc_dapm_widget_power/enable
$ arecord -D hw:tegrasnd210tref,0 -c 1 -r 44100 -f S16_LE -d 10 cap.wav
$ sudo cat /sys/kernel/debug/tracing/trace

测试结果如下:

desktop:~$ amixer -c tegrasndt210ref cget name="I2S4 Codec Master Mode"
amixer: Cannot find the given element from control hw:1

desktop:~$ echo 0 | sudo tee /sys/kernel/debug/tracing/trace
0
desktop:~$ echo 0 | sudo tee /sys/kernel/debug/tracing/events/enable
0
desktop:~$ echo 1 | sudo tee /sys/kernel/debug/tracing/tracing_on
1
desktop:~$ echo 1 | sudo tee /sys/kernel/debug/tracing/events/asoc/snd_soc_dapm_widget_power/enable
1
desktop:~$ arecord -D hw:tegrasnd210tref,0 -c 1 -r 44100 -f S16_LE -d 10 cap.wav
ALSA lib pcm_hw.c:1713:(_snd_pcm_hw_open) Invalid value for card
arecord: main:788: audio open error: No such device
desktop:~$ sudo cat /sys/kernel/debug/tracing/trace
# tracer: nop
#
# entries-in-buffer/entries-written: 0/0   #P:4
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |

4. I2S4编解码器主模式控件

以下说明了什么?

amixer -c tegrasndt210ref controls | grep I2S4

如果看到
“I2S4编解码器主模式”控件
确保引号没有再次出现问题
如果有问题的话，可以打出。
请注意这里记录了所有I2S混频器控件以供参考

$ echo 0 | sudo tee /sys/kernel/debug/tracing/trace
$ echo 0 | sudo tee /sys/kernel/debug/tracing/events/enable
$ echo 1 | sudo tee /sys/kernel/debug/tracing/tracing_on
$ echo 1 | sudo tee /sys/kernel/debug/tracing/events/asoc/snd_soc_dapm_widget_power/enable
$ arecord -D hw:tegrasndt210ref,0 -c 1 -r 44100 -f S16_LE -d 10 cap.wav
$ sudo cat /sys/kernel/debug/tracing/trace

结果如下

desktop:~$ amixer -c tegrasndt210ref controls | grep I2S4
numid=480,iface=MIXER,name='I2S4 BCLK Ratio'
numid=482,iface=MIXER,name='I2S4 Capture mono to stereo conv'
numid=481,iface=MIXER,name='I2S4 Capture stereo to mono conv'
numid=479,iface=MIXER,name='I2S4 Channels'
numid=474,iface=MIXER,name='I2S4 Loopback'
numid=531,iface=MIXER,name='I2S4 Mux'
numid=485,iface=MIXER,name='I2S4 Playback FIFO threshold'
numid=484,iface=MIXER,name='I2S4 Playback mono to stereo conv'
numid=483,iface=MIXER,name='I2S4 Playback stereo to mono conv'
numid=478,iface=MIXER,name='I2S4 Sample Rate'
numid=476,iface=MIXER,name='I2S4 codec bit format'
numid=618,iface=MIXER,name='I2S4 codec frame mode'
numid=619,iface=MIXER,name='I2S4 codec master mode'
numid=477,iface=MIXER,name='I2S4 fsync width'
numid=475,iface=MIXER,name='I2S4 input bit format'
desktop:~$ echo 0 | sudo tee /sys/kernel/debug/tracing/trace
[sudo] password for dim: 
0
desktop:~$ echo 0 | sudo tee /sys/kernel/debug/tracing/events/enable
0
desktop:~$ echo 1 | sudo tee /sys/kernel/debug/tracing/tracing_on
1
desktop:~$ echo 1 | sudo tee /sys/kernel/debug/tracing/events/asoc/snd_soc_dapm_widget_power/enable
1
desktop:~$ arecord -D hw:tegrasndt210ref,0 -c 1 -r 44100 -f S16_LE -d 10 cap.wav
Recording WAVE 'cap.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Mono
desktop:~$ sudo cat /sys/kernel/debug/tracing/trace
# tracer: nop
#
# entries-in-buffer/entries-written: 30/30   #P:4
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |
         arecord-8310  [003] ....   200.128923: snd_soc_dapm_widget_power: widget=Capture 1 val=1
         arecord-8310  [003] ....   200.128928: snd_soc_dapm_widget_power: widget=ADMAIF1 Transmit val=1
         arecord-8310  [003] ....   200.128930: snd_soc_dapm_widget_power: widget=ADMAIF1 TX val=1
         arecord-8310  [003] ....   200.128931: snd_soc_dapm_widget_power: widget=ADMAIF1 Mux val=1
         arecord-8310  [003] ....   200.128943: snd_soc_dapm_widget_power: widget=I2S4 RX val=1
         arecord-8310  [003] ....   200.128945: snd_soc_dapm_widget_power: widget=I2S4 Receive val=1
         arecord-8310  [003] ....   200.128946: snd_soc_dapm_widget_power: widget=I2S4 CIF Transmit-I2S4 Receive val=1
         arecord-8310  [003] ....   200.128947: snd_soc_dapm_widget_power: widget=I2S4 CIF Transmit val=1
         arecord-8310  [003] ....   200.128948: snd_soc_dapm_widget_power: widget=I2S4 CIF TX val=1
         arecord-8310  [003] ....   200.128950: snd_soc_dapm_widget_power: widget=I2S4 DAP RX val=1
         arecord-8310  [003] ....   200.128951: snd_soc_dapm_widget_power: widget=I2S4 DAP Receive val=1
         arecord-8310  [003] ....   200.128952: snd_soc_dapm_widget_power: widget=x Capture-I2S4 DAP Receive val=1
         arecord-8310  [003] ....   200.128954: snd_soc_dapm_widget_power: widget=x Capture val=1
         arecord-8310  [003] ....   200.128955: snd_soc_dapm_widget_power: widget=x IN val=1
         arecord-8310  [003] ....   200.128956: snd_soc_dapm_widget_power: widget=x Mic val=1
         arecord-8310  [000] ....   200.557074: snd_soc_dapm_widget_power: widget=Capture 1 val=0
         arecord-8310  [000] ....   200.557107: snd_soc_dapm_widget_power: widget=ADMAIF1 Transmit val=0
         arecord-8310  [000] ....   200.557121: snd_soc_dapm_widget_power: widget=ADMAIF1 TX val=0
         arecord-8310  [000] ....   200.557134: snd_soc_dapm_widget_power: widget=ADMAIF1 Mux val=0
         arecord-8310  [000] ....   200.557187: snd_soc_dapm_widget_power: widget=I2S4 RX val=0
         arecord-8310  [000] ....   200.557204: snd_soc_dapm_widget_power: widget=I2S4 Receive val=0
         arecord-8310  [000] ....   200.557217: snd_soc_dapm_widget_power: widget=I2S4 CIF Transmit-I2S4 Receive val=0
         arecord-8310  [000] ....   200.557230: snd_soc_dapm_widget_power: widget=I2S4 CIF Transmit val=0
         arecord-8310  [000] ....   200.557242: snd_soc_dapm_widget_power: widget=I2S4 CIF TX val=0
         arecord-8310  [000] ....   200.557253: snd_soc_dapm_widget_power: widget=I2S4 DAP RX val=0
         arecord-8310  [000] ....   200.557265: snd_soc_dapm_widget_power: widget=I2S4 DAP Receive val=0
         arecord-8310  [000] ....   200.557277: snd_soc_dapm_widget_power: widget=x Capture-I2S4 DAP Receive val=0
         arecord-8310  [000] ....   200.557289: snd_soc_dapm_widget_power: widget=x Capture val=0
         arecord-8310  [000] ....   200.557301: snd_soc_dapm_widget_power: widget=x IN val=0
         arecord-8310  [000] ....   200.557311: snd_soc_dapm_widget_power: widget=x Mic val=0