HD Audio mono microphone capture examples don't work

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Orin
1

If I run either of the mono mic capture examples from:

https://docs.nvidia.com/jetson/archives/r36.4/DeveloperGuide/SD/Communications/AudioSetupAndDevelopment.html#microphone-capture

It results in error:

arecord: pcm_read:2221: read error: Input/output error

However, I can run the stereo mic capture example without issue.

This is on a Jetson AGX Orin Developer Kit with Jetpack 6.1 installed and running Tegra:

R36 (release), REVISION: 4.0, GCID: 37537400, BOARD: generic, EABI: aarch64, DATE: Fri Sep 13 04:36:44 UTC 2024

8

Hi Andrew,

Since we are using I2S mode, the minimum clocking must be set for 2 channels due to the LRCK mode. For mono use cases, it’s necessary to adjust the clock accordingly.

Please run the following mixer control setting to ensure proper functionality:
amixer -c APE cset name='I2S1 BCLK Ratio' 2

We will also update the BSP documentation to incorporate this

9

Hi Sheetal,

Many thanks, that did the trick.

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