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Original question:

BEAGL-BONE-BLACK: Enable UART5

BEAGL-BONE-BLACK: Accessing USB1_DRVVBUS to disable USB Host

Mali Kanchan
Prodigy 70 points

Part Number: BEAGL-BONE-BLACK

Tool/software:

Hello,

I want to use BeagleBone Black in low power mode. With this in mind I've been looking for ways to disable the USB host power output.

Looking at the BBB schematic there is a 'USB1_DRVVBUS' output from the am335x which controls the USB host 5V output. I tried to manipulate this pin by following command

devmem2 0x47401c60 b 0x00

After this I was expecting pin USB1_DRVVBUS will become low and USB output will get disabled. But this didn’t work. I am getting 3.3V at pin USB1_DRVVBUS. What am I missing here?

I'm using below configuration,

Debian Bullseye IoT image 2023-09-02.

Kernel version : linux beaglebone 5.10.168-ti-r71.

Debian version : 11.7

I would really appreciate your help.

Thank you,