Jetson Nano Developper kit I2S


I’m trying to use a Sipeed microphone array with the Jetson Nano Dev kit’s 40 pin header.

If I understand the provided pin definition correctly, I would be able to use 2 channels of this array with the correct header pin configuration.

The problem is that I can’t manage to convert the GPIO pin to I2S pin.

When I use the interface and use the i2s4 pin configuration, after a reboot, pins (12,35,38,40) display the correct function but it doesn’t seem to change anything :

sudo cat /sys/kernel/debug/tegra_gpio
J: 2:1 f0 00 00 00 00 00 000000

where f0 should be 00.

I found on other topics that configuring the bootloader with U-boot can fix pin configuration, but is it the only solution ? Knowing Nvidia provided an interface to do so, maybe you can provide me with a simpler solution ?

If not, I can try to activate u-boot on the Jetson Nano, but is there any risk flashing u-boot? Knowing that I have data and board configuration that I don’t want to lose.

Thanks in advance.

Looks like duplicate topic.

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