RE: Printing to an I2C OLED display / error: '__device_dts_ord_DT_CHOSEN_zephyr_display_ORD' undeclared (first use in this function)

Raoul — Thu, 13 Apr 2023 14:17:03 GMT

Hi,

Thanks for adding your build log!

The warning at line 41 of the log has revealed the issue. In step 4 of the guide (I'm assuming you're at part 1), you are asked to edit CMakeLists.txt to add a "shield" to the configuration. This has to be done before the "find_package" CMake command, otherwise it won't work. Unfortunately I don't understand CMake well enough to explain why.

So, as stated in the tutorial, the line

set(SHIELD ssd1306_128x32)

should be added right after the line

cmake_minimum_required(VERSION 3.20.0)

and no later. If I follow that on my machine, this fixes the issue.

By the way, the tutorial has an associated GitHub repo that you could use to check if you did things correctly: https://github.com/hx91/oled-ssd1306-lvgl/tree/main/part-1

Best regards,

Raoul