How to use gtk & device file together

[stomo.1]

bord: STM32MP157-EV1

I want the LCD to display messages received by UART communication.

However, when I run GTK with the command below, I get an error because I can't access the device file.

su -l weston -c "/usr/local/xxxx"

What should I do?

[Kevin HUBER]

Hello @stomo.1​ ,

Please can you share with us the complete error log.

Best Regards,

Kevin

[stomo.1]

command: su -l weston -c "/usr/local/gtk_hello_world2"

stop program

command: /usr/local/gtk_hello_world2

error "Gtk-WARNING"

Best Regrds,

stomo.1

[stomo.1]

This is c.file

[stomo.1]

Makefile