尝试在Jetson Nano上使用I2S麦克风(inmp441) 目前没有成功 已经使用以下引脚(J40连接器的引脚编号)连接麦克风:
(J40) (inmp441) Pin1 = (3 v) Pin12 = (SCK) Pin35 = (WS) Pin38 = (SD) Pin39 = (GND = L/R)已经配置了I2S4 Jetson引脚 以使用Adafruit SPH0645LM4H硬件 执行:
（1）Sudo grep dap4 /sys/kernel/debug/tegra_pinctrl_reg
Bank: 1 Reg: 0x70003144 Val: 0x00000044 → dap4_fs_pj4 Bank: 1 Reg: 0x70003148 Val: 0x00000054 → dap4_din_pj5 Bank: 1 Reg: 0x7000314c Val: 0x00000015 → dap4_dout_pj6 Bank: 1 Reg: 0x70003150 Val: 0x00000044 → dap4_sclk_pj7（2）sudo grep “Name:|J:|BB:” /sys/kernel/debug/tegra_gpio
Name:Bank:Port CNF OE OUT IN INT_STA INT_ENB INT_LVL J: 2:1 00 00 00 00 00 00 000000 BB: 6:3 00 00 00 00 00 00 000000（3）amixer -c tegrasndt210ref cset name=‘ADMAIF1 Mux’
numid=518,iface=MIXER,name=‘ADMAIF1 Mux’ ; type=ENUMERATED,access=rw——,values=1,items=53 ; Item #0 ‘None’ ; Item #1 ‘ADMAIF1’ ; Item #2 ‘ADMAIF2’ ; Item #3 ‘ADMAIF3’ ; Item #4 ‘ADMAIF4’ ; Item #5 ‘ADMAIF5’ ; Item #6 ‘ADMAIF6’ ; Item #7 ‘ADMAIF7’ ; Item #8 ‘ADMAIF8’ ; Item #9 ‘ADMAIF9’ ; Item #10 ‘ADMAIF10’ ; Item #11 ‘I2S1’ ; Item #12 ‘I2S2’ ; Item #13 ‘I2S3’ ; Item #14 ‘I2S4’ ; Item #15 ‘I2S5’ ; Item #16 ‘SFC1’ ; Item #17 ‘SFC2’ ; Item #18 ‘SFC3’ ; Item #19 ‘SFC4’ ; Item #20 ‘MIXER1-1’ ; Item #21 ‘MIXER1-2’ ; Item #22 ‘MIXER1-3’ ; Item #23 ‘MIXER1-4’ ; Item #24 ‘MIXER1-5’ ; Item #25 ‘AMX1’ ; Item #26 ‘AMX2’ ; Item #27 ‘AFC1’ ; Item #28 ‘AFC2’ ; Item #29 ‘AFC3’ ; Item #30 ‘AFC4’ ; Item #31 ‘AFC5’ ; Item #32 ‘AFC6’ ; Item #33 ‘OPE1’ ; Item #34 ‘OPE2’ ; Item #35 ‘SPKPROT1’ ; Item #36 ‘MVC1’ ; Item #37 ‘MVC2’ ; Item #38 ‘IQC1-1’ ; Item #39 ‘IQC1-2’ ; Item #40 ‘IQC2-1’ ; Item #41 ‘IQC2-2’ ; Item #42 ‘DMIC1’ ; Item #43 ‘DMIC2’ ; Item #44 ‘DMIC3’ ; Item #45 ‘ADX1-1’ ; Item #46 ‘ADX1-2’ ; Item #47 ‘ADX1-3’ ; Item #48 ‘ADX1-4’ ; Item #49 ‘ADX2-1’ ; Item #50 ‘ADX2-2’ ; Item #51 ‘ADX2-3’ ; Item #52 ‘ADX2-4’ : values=14<
（4）amixer -c tegrasndt210ref sget “ADMAIF1 Mux”
amixer: Unable to find simple control ‘“ADMAIF1’,0 2. 查看内核&dts差异是否对内核和/或设备树做了任何更改? 不，没有
$ amixer -c tegrasndt210ref cget name=‘ADMAIF1 Mux’ amixer: Cannot find the given element from control hw:1 $ amixer scontrols amixer: Mixer attach default error: No such device除了设备树更改之外，还做了其他更改吗? 没有
# 不工作 amixer -c tegrasndt210ref sget “ADMAIF1 Mux” # 工作正常 amixer -c tegrasndt210ref sget “ADMAIF1 Mux” 3. amixeramixer -c tegrasndt210ref controls
numid=528,iface=MIXER,name=‘I2S1 Mux’ numid=529,iface=MIXER,name=‘I2S2 Mux’ numid=492,iface=MIXER,name=‘I2S3 BCLK Ratio’ numid=494,iface=MIXER,name=‘I2S3 Capture mono to stereo conv’ numid=493,iface=MIXER,name=‘I2S3 Capture stereo to mono conv’ numid=491,iface=MIXER,name=‘I2S3 Channels’ numid=486,iface=MIXER,name=‘I2S3 Loopback’ numid=530,iface=MIXER,name=‘I2S3 Mux’ numid=497,iface=MIXER,name=‘I2S3 Playback FIFO threshold’ numid=496,iface=MIXER,name=‘I2S3 Playback mono to stereo conv’ numid=495,iface=MIXER,name=‘I2S3 Playback stereo to mono conv’ numid=490,iface=MIXER,name=‘I2S3 Sample Rate’ numid=488,iface=MIXER,name=‘I2S3 codec bit format’ numid=620,iface=MIXER,name=‘I2S3 codec frame mode’ numid=621,iface=MIXER,name=‘I2S3 codec master mode’ numid=489,iface=MIXER,name=‘I2S3 fsync width’ numid=487,iface=MIXER,name=‘I2S3 input bit format’ 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’ numid=532,iface=MIXER,name=‘I2S5 Mux’ numid=453,iface=MIXER,name=‘ADMAIF1 Capture stereo to mono conv’ numid=443,iface=MIXER,name=‘ADMAIF1 Channels’ numid=518,iface=MIXER,name=‘ADMAIF1 Mux’ numid=463,iface=MIXER,name=‘ADMAIF1 Playback mono to stereo conv’ numid=462,iface=MIXER,name=‘ADMAIF10 Capture stereo to mono conv’ numid=452,iface=MIXER,name=‘ADMAIF10 Channels’ numid=527,iface=MIXER,name=‘ADMAIF10 Mux’ numid=472,iface=MIXER,name=‘ADMAIF10 Playback mono to stereo conv’ numid=454,iface=MIXER,name=‘ADMAIF2 Capture stereo to mono conv’ numid=444,iface=MIXER,name=‘ADMAIF2 Channels’ numid=519,iface=MIXER,name=‘ADMAIF2 Mux’ numid=464,iface=MIXER,name=‘ADMAIF2 Playback mono to stereo conv’ numid=455,iface=MIXER,name=‘ADMAIF3 Capture stereo to mono conv’ numid=445,iface=MIXER,name=‘ADMAIF3 Channels’ numid=520,iface=MIXER,name=‘ADMAIF3 Mux’ numid=465,iface=MIXER,name=‘ADMAIF3 Playback mono to stereo conv’ numid=456,iface=MIXER,name=‘ADMAIF4 Capture stereo to mono conv’ numid=446,iface=MIXER,name=‘ADMAIF4 Channels’ numid=521,iface=MIXER,name=‘ADMAIF4 Mux’ numid=466,iface=MIXER,name=‘ADMAIF4 Playback mono to stereo conv’ numid=457,iface=MIXER,name=‘ADMAIF5 Capture stereo to mono conv’ numid=447,iface=MIXER,name=‘ADMAIF5 Channels’ numid=522,iface=MIXER,name=‘ADMAIF5 Mux’ …. numid=227,iface=MIXER,name=‘ADX2 Byte Map 19’ numid=210,iface=MIXER,name=‘ADX2 Byte Map 2’ numid=228,iface=MIXER,name=‘ADX2 Byte Map 20’ numid=229,iface=MIXER,name=‘ADX2 Byte Map 21’ numid=230,iface=MIXER,name=‘ADX2 Byte Map 22’ numid=231,iface=MIXER,name=‘ADX2 Byte Map 23’ numid=232,iface=MIXER,name=‘ADX2 Byte Map 24’ numid=233,iface=MIXER,name=‘ADX2 Byte Map 25’ numid=234,iface=MIXER,name=‘ADX2 Byte Map 26’ numid=235,iface=MIXER,name=‘ADX2 Byte Map 27’ numid=236,iface=MIXER,name=‘ADX2 Byte Map 28’ numid=237,iface=MIXER,name=‘ADX2 Byte Map 29’ …. numid=136,iface=MIXER,name=‘AMX2 Input2 Channels’ numid=137,iface=MIXER,name=‘AMX2 Input3 Channels’ numid=138,iface=MIXER,name=‘AMX2 Input4 Channels’ numid=134,iface=MIXER,name=‘AMX2 Output Channels’ numid=562,iface=MIXER,name=‘AMX2-1 Mux’ numid=563,iface=MIXER,name=‘AMX2-2 Mux’ numid=564,iface=MIXER,name=‘AMX2-3 Mux’ numid=565,iface=MIXER,name=‘AMX2-4 Mux’ numid=473,iface=MIXER,name=‘APE Reg Dump’ numid=568,iface=MIXER,name=‘Adder1 RX1’ numid=577,iface=MIXER,name=‘Adder1 RX10’ numid=569,iface=MIXER,name=‘Adder1 RX2’ numid=570,iface=MIXER,name=‘Adder1 RX3’ numid=571,iface=MIXER,name=‘Adder1 RX4’ numid=572,iface=MIXER,name=‘Adder1 RX5’ numid=573,iface=MIXER,name=‘Adder1 RX6’ numid=574,iface=MIXER,name=‘Adder1 RX7’ numid=575,iface=MIXER,name=‘Adder1 RX8’ numid=576,iface=MIXER,name=‘Adder1 RX9’ numid=578,iface=MIXER,name=‘Adder2 RX1’ numid=587,iface=MIXER,name=‘Adder2 RX10’ numid=579,iface=MIXER,name=‘Adder2 RX2’ numid=580,iface=MIXER,name=‘Adder2 RX3’ numid=581,iface=MIXER,name=‘Adder2 RX4’ numid=582,iface=MIXER,name=‘Adder2 RX5’ numid=583,iface=MIXER,name=‘Adder2 RX6’ numid=584,iface=MIXER,name=‘Adder2 RX7’ numid=585,iface=MIXER,name=‘Adder2 RX8’ numid=586,iface=MIXER,name=‘Adder2 RX9’ numid=588,iface=MIXER,name=‘Adder3 RX1’ numid=597,iface=MIXER,name=‘Adder3 RX10’ numid=589,iface=MIXER,name=‘Adder3 RX2’ numid=590,iface=MIXER,name=‘Adder3 RX3’ numid=591,iface=MIXER,name=‘Adder3 RX4’ numid=592,iface=MIXER,name=‘Adder3 RX5’ numid=593,iface=MIXER,name=‘Adder3 RX6’ numid=594,iface=MIXER,name=‘Adder3 RX7’ numid=595,iface=MIXER,name=‘Adder3 RX8’ numid=596,iface=MIXER,name=‘Adder3 RX9’ numid=598,iface=MIXER,name=‘Adder4 RX1’ numid=607,iface=MIXER,name=‘Adder4 RX10’ numid=599,iface=MIXER,name=‘Adder4 RX2’ numid=600,iface=MIXER,name=‘Adder4 RX3’ numid=601,iface=MIXER,name=‘Adder4 RX4’ numid=602,iface=MIXER,name=‘Adder4 RX5’ numid=603,iface=MIXER,name=‘Adder4 RX6’ numid=604,iface=MIXER,name=‘Adder4 RX7’ numid=605,iface=MIXER,name=‘Adder4 RX8’ numid=606,iface=MIXER,name=‘Adder4 RX9’ numid=608,iface=MIXER,name=‘Adder5 RX1’ numid=617,iface=MIXER,name=‘Adder5 RX10’ numid=609,iface=MIXER,name=‘Adder5 RX2’ numid=610,iface=MIXER,name=‘Adder5 RX3’ numid=611,iface=MIXER,name=‘Adder5 RX4’ numid=612,iface=MIXER,name=‘Adder5 RX5’ numid=613,iface=MIXER,name=‘Adder5 RX6’ numid=614,iface=MIXER,name=‘Adder5 RX7’ numid=615,iface=MIXER,name=‘Adder5 RX8’ numid=616,iface=MIXER,name=‘Adder5 RX9’ numid=498,iface=MIXER,name=‘DMIC1 Boost Gain’ numid=500,iface=MIXER,name=‘DMIC1 Capture mono to stereo conv’ numid=501,iface=MIXER,name=‘DMIC1 Capture stereo to mono conv’ numid=504,iface=MIXER,name=‘DMIC1 Channels’ numid=499,iface=MIXER,name=‘DMIC1 Controller Channel Select’ numid=506,iface=MIXER,name=‘DMIC1 LR Select’ numid=505,iface=MIXER,name=‘DMIC1 OSR Value’ numid=503,iface=MIXER,name=‘DMIC1 Sample Rate’ numid=502,iface=MIXER,name=‘DMIC1 output bit format’ numid=507,iface=MIXER,name=‘DMIC2 Boost Gain’ numid=509,iface=MIXER,name=‘DMIC2 Capture mono to stereo conv’ numid=510,iface=MIXER,name=‘DMIC2 Capture stereo to mono conv’ numid=513,iface=MIXER,name=‘DMIC2 Channels’ numid=508,iface=MIXER,name=‘DMIC2 Controller Channel Select’ numid=515,iface=MIXER,name=‘DMIC2 LR Select’ numid=514,iface=MIXER,name=‘DMIC2 OSR Value’ numid=512,iface=MIXER,name=‘DMIC2 Sample Rate’ numid=511,iface=MIXER,name=‘DMIC2 output bit format’ numid=537,iface=MIXER,name=‘MIXER1-1 Mux’ numid=546,iface=MIXER,name=‘MIXER1-10 Mux’ numid=538,iface=MIXER,name=‘MIXER1-2 Mux’ numid=539,iface=MIXER,name=‘MIXER1-3 Mux’ numid=540,iface=MIXER,name=‘MIXER1-4 Mux’ numid=541,iface=MIXER,name=‘MIXER1-5 Mux’ numid=542,iface=MIXER,name=‘MIXER1-6 Mux’ numid=543,iface=MIXER,name=‘MIXER1-7 Mux’ numid=544,iface=MIXER,name=‘MIXER1-8 Mux’ numid=545,iface=MIXER,name=‘MIXER1-9 Mux’ numid=348,iface=MIXER,name=‘MVC1 Bits’ numid=349,iface=MIXER,name=‘MVC1 Channels’ numid=295,iface=MIXER,name=‘RX9 Gain Instant’ numid=317,iface=MIXER,name=‘SFC1 Channels’ numid=533,iface=MIXER,name=‘SFC1 Mux’ numid=318,iface=MIXER,name=‘SFC1 init’ numid=315,iface=MIXER,name=‘SFC1 input bit format’ numid=313,iface=MIXER,name=‘SFC1 input rate’ numid=319,iface=MIXER,name=‘SFC1 input stereo conv’ numid=316,iface=MIXER,name=‘SFC1 output bit format’ numid=320,iface=MIXER,name=‘SFC1 output mono conv’ numid=314,iface=MIXER,name=‘SFC1 output rate’ numid=325,iface=MIXER,name=‘SFC2 Channels’ numid=534,iface=MIXER,name=‘SFC2 Mux’ numid=326,iface=MIXER,name=‘SFC2 init’ numid=323,iface=MIXER,name=‘SFC2 input bit format’ numid=321,iface=MIXER,name=‘SFC2 input rate’ numid=327,iface=MIXER,name=‘SFC2 input stereo conv’ numid=324,iface=MIXER,name=‘SFC2 output bit format’ numid=328,iface=MIXER,name=‘SFC2 output mono conv’ numid=322,iface=MIXER,name=‘SFC2 output rate’ numid=333,iface=MIXER,name=‘SFC3 Channels’ numid=535,iface=MIXER,name=‘SFC3 Mux’ numid=334,iface=MIXER,name=‘SFC3 init’ numid=331,iface=MIXER,name=‘SFC3 input bit format’ numid=329,iface=MIXER,name=‘SFC3 input rate’ numid=335,iface=MIXER,name=‘SFC3 input stereo conv’ numid=332,iface=MIXER,name=‘SFC3 output bit format’ numid=336,iface=MIXER,name=‘SFC3 output mono conv’ numid=330,iface=MIXER,name=‘SFC3 output rate’ numid=341,iface=MIXER,name=‘SFC4 Channels’ numid=536,iface=MIXER,name=‘SFC4 Mux’ numid=342,iface=MIXER,name=‘SFC4 init’ numid=339,iface=MIXER,name=‘SFC4 input bit format’ numid=337,iface=MIXER,name=‘SFC4 input rate’ numid=343,iface=MIXER,name=‘SFC4 input stereo conv’ numid=340,iface=MIXER,name=‘SFC4 output bit format’ numid=344,iface=MIXER,name=‘SFC4 output mono conv’ numid=338,iface=MIXER,name=‘SFC4 output rate’ numid=555,iface=MIXER,name=‘SPKPROT1 Mux’ numid=307,iface=MIXER,name=‘TX1 Channels’ numid=308,iface=MIXER,name=‘TX2 Channels’ numid=309,iface=MIXER,name=‘TX3 Channels’ numid=310,iface=MIXER,name=‘TX4 Channels’ numid=311,iface=MIXER,name=‘TX5 Channels’ numid=517,iface=MIXER,name=‘codec-x format’ numid=516,iface=MIXER,name=‘codec-x rate’<
amixer -c tegrasndt210ref sget “ADMAIF1 Mux”
Simple mixer control ‘ADMAIF1 Mux’,0 Capabilities: enum Items: ‘None’ ‘ADMAIF1’ ‘ADMAIF2’ ‘ADMAIF3’ ‘ADMAIF4’ ‘ADMAIF5’ ‘ADMAIF6’ ‘ADMAIF7’ ‘ADMAIF8’ ‘ADMAIF9’ ‘ADMAIF10’ ‘I2S1’ ‘I2S2’ ‘I2S3’ ‘I2S4’ ‘I2S5’ ‘SFC1’ ‘SFC2’ ‘SFC3’ ‘SFC4’ ‘MIXER1-1’ ‘MIXER1-2’ ‘MIXER1-3’ ‘MIXER1-4’ ‘MIXER1-5’ ‘AMX1’ ‘AMX2’ ‘AFC1’ ‘AFC2’ ‘AFC3’ ‘AFC4’ ‘AFC5’ ‘AFC6’ ‘OPE1’ ‘OPE2’ ‘SPKPROT1’ ‘MVC1’ ‘MVC2’ ‘IQC1-1’ ‘IQC1-2’ ‘IQC2-1’ ‘IQC2-2’ ‘DMIC1’ ‘DMIC2’ ‘DMIC3’ ‘ADX1-1’ ‘ADX1-2’ ‘ADX1-3’ ‘ADX1-4’ ‘ADX2-1’ ‘ADX2-2’ ‘ADX2-3’ ‘ADX2-4’ Item0: ‘I2S4’ 4. 采集音频 arecord -D hw:tegrasnd210ref,0 -c <num-channels> -r <sample-rate> -f <sample-size> -d 10 cap.wav示例：
arecord -D hw:tegrasnd210ref,0 -c 1 -r 44100 -f S16_LE -D 10 cap.wav得到如下
ALSA lib pcm_hw.c:1713:(_snd_pcm_hw_open) Invalid value for card arecord: main:788: audio open error: No such device当尝试通过Audacity (Recording device = default)记录时 得到的结果是噪音
