Mity CPU Platforms » MitySOM-AM62, MitySOM-AM62A, & MitySOM-AM62P

02/23/2026

JC 04:01 PM Software Development: RE: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

Glad it worked. Thanks for closing the loop Jonathan Cormier

PS 10:44 AM Software Development: RE: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

Just a quick note to say thanks to everyone for solving this issue this quickly
We have fitted the pullups to our board and can now see the outputs toggling
Paul Paul Strutt

02/20/2026

JC 09:40 PM Software Development: RE: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

We will review and fix our datasheets to make mention of this as well. Jonathan Cormier

JC 09:39 PM Software Development: RE: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

Hi Paul,
After reviewing and trying a few things, we noticed that these pins are labelled differently in the "TI datasheet pg 52":https://www.ti.com/lit/ds/symlink/am625.pdf?ts=1661784805550
MCU_GPIO_17/18/19/20 are classified as B... Jonathan Cormier

JP 03:52 PM Software Development: RE: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

Good morning Paul,
Thank you for the information. We were able to see the same behavior on our end. Tying 3.3 V to the MCU_GPIO0_17 through MCU_GPIO0_20 pins changed the state from low to high and back when configured as inputs. Jake Pregitzer

PS 09:18 AM Software Development: RE: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

Thanks for all the updates.
It sounds like you can at least reproduce the problem which is a start
Just to answer the other questions. I believe this is a standard AM62x, and for the time being we are using a development board so w... Paul Strutt

02/19/2026

JP 08:15 PM Software Development: RE: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

Hello Paul,
We have replicated this issue on our end. I am using a 62x with our latest SDK (11.01) and found that MCU_GPIO0_17 through MCU_GPIO0_20 were not changing after a gpio set. We also noticed MCU_GPIO0_0 through MCU_GPIO0_4 we... Jake Pregitzer

JC 07:36 PM Software Development: RE: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

Also are you testing this on our devkit or on a custom design? If a custom design, would you be willing to email it to us for review? Jonathan Cormier

MW 07:19 PM Software Development: RE: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

Hi Paul,
To confirm, you are using a standard AM62x SOM, correct (not an AM62Ax or AM62Px)?
Thanks,
Mike
Michael Williamson

PS 04:19 PM Software Development: RE: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

Thanks Mike
I think I have set up the GPIO lines correctly. I followed the steps described in the following wiki
https://support.criticallink.com/redmine/projects/mitysom_am62x/wiki/Example_-_User_level_GPIO_Access
I came up with gp... Paul Strutt

MW 12:59 PM Software Development: RE: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

Hi Paul,
By default, the MCU_GPIO peripheral is controlled in the linux kernel for the devkit. (see the arch/arm64/boot/dts/k3-am62x-mitysom-devkit.dts file which enables it).
I am wondering if perhaps there is a conflict between ... Michael Williamson

PS 11:41 AM Software Development: Problems writing to MCU_GPIO0_19 and MCU_GPIO0_20

I have created an MCU application that uses the MCSPI to communicate with multiple SPI devices.
We need to talk to up to eight SPI devices so are using the MCSPI with a single chip select (MCU_SPI0_CS0), and then are using 3 GPIO lines ... Paul Strutt