I am trying to get audio on the 40 pin connector of the Jetson Nano. I found the following pinout: Pin7 = AUDIO_MCLK Pin12 = DAP4_SCLK Pin35 = DAP4_FS Pin38 = DAP4_DIN Pin40 = DAP4_DOUT I tried to setup the audio routing using amixer with the following commands: amixer -c1 sset ‘ADMAIF1 Mux’…

Hello! Sorry for the delay on this but we are still in the process of completing the appropriate documentation. Typically, the process for reconfiguring the pins is … Using the provided pinmux spreadsheet, configure the pins are required and then using the spreadsheet there is a button to genera…

Hi Jon,. I have run the commands and I got the following output: $ amixer -c tegrasndt210ref sset "ADMAIF1 Mux" "I2S4" $ arecord -D hw:tegrasndt210ref,0 -r 16000 -f S16_LE -c 2 -d 10 test.wav & $ sudo grep dap4 /sys/kernel/debug/tegra_pinctrl_reg Bank: 1 Reg: 0x70003144 Val: 0x00000044 -> dap4_fs_…

Hello Kira, When arecord is not running, the I2S registered are not accessible directly and so the regmap driver will show the last known state for the registers. However, any registers that are marked as volatile will appear as XXXXXXXX. So what you are seeing when arecord is not running is expect…

Hi Kira, Just to let you know that I have tested the I2S interface on the same version of the Jetson Nano (A02) that you have and it is working fine without anything connected. In other words, I see the bitclock and frame sync toggling at the expected frequencies. I have some adafruit i2s mems mics…

Hi Jon, Thank you very much for your tips. So, very interestingly, after installing Jetson.GPIO library, the pins and so the mic, started to work! In summary, the steps that fixed the buggy configuration on my Jetson were: Flash Jetson Nano using SDK Manager (JetPack version 4.2) [host machine…

Hi Kira, Thanks for the feedback. I have received my microphones and will hopefully do some testing this week. It is odd that installing the Jetson.GPIO library helped. It should not be needed in general. I will test with L4T r32.2 and let you know my findings. Regards, Jon

Hi Jon, I have tested the command that you mentioned with JetPack 4.2.1 and, indeed, the microphone works straight away! Now, I am trying to figure out how to make the fix permanent. Unfortunately, the DTB provided by @jas-mx no longer works with JetPack 4.2.1. If you have any suggestions on how t…

I’ll create a new dtb and post it, unfortunately the pins need to be mux’d correctly for a permanent fix.

Hi jas-mx, That’s excellent - thank you very much. This is exactly what I need. I’ll wait to hear from you. Kind regards, Kira

Hello! An alternative to updating the DTB, is to rebuild the bootloader with the following change and flash the updated bootloader. [image] I2S audio output not working Hi, I’m trying to configure nano I2S audio output as below: aud_mclk I2S3_LRCK I2S3_SDATA_IN I2S3_SDATA_OUT I2S…

Audio I2S on 40 Pin Connector

Robotics & Edge Computing Jetson Systems Jetson Nano

jonathanh July 29, 2019, 10:50am 48

Hi Kira,

I have tested the Adafruit I2S MEMS mic on my Jetson Nano with rel32.2. To get the mic to work all I needed to do was force the pins to the I2S function by writing the following register using the U-Boot command line …

Tegra210 (P3450-Porg) # mw 0x6000d204 0

I am interested if this works for you with rel32.2.

Regards,
Jon

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Audio I2S on 40 Pin Connector

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