TQMa64xxL - YOCTO Linux BSP documentation

Overview
Quickstart BSP
Deployment
How-To
Known Issues

GPIO Buttons

The MBaX4XxL features one user button which is handled by the gpio-keys driver.

Please note that most GPIOs can't be set or read from U-Boot, as they are disabled in default pinmuxing, which effects the GPIO button as well. In Linux, the button works as expected

GPIO Button Overview

Reference	Button
S8	BTN0

GPIO Button Location

The buttons are accessible via the input device interface. You can identify the correct event node and test the buttons using the evtest tool:

evtest

Select the number corresponding to the “gpio-keys” device. Alternatively, if the event node is known (e.g. /dev/input/event1), you can run it directly:

evtest /dev/input/event0