Zephyr + nRF5240 DK + lvgl + SSD1306

Question

Hi,

I am developing an application with the lvgl driver. I was trying to make the example lvgl works, but I can not. I am using a 128 x 32 screen with a ssd1306 controller (in the description of the example says it is compatible). When I connect the screen to the board and flash the code nothing happens (the screen does not turn on). I dont know what part of the configuration I have to change depending on the screen type. I connect the screen to 5V and GND of the DK and the I2C to 31 and 30 pins. I did not change noting in the code. Doing debug of the code I have seen that the the functions below the "device_get_binding" does not execute.

¿Do you know if I am missing something important about the configuration?. I think the problem is the configuration of the display in the kconfig or the configuration in the I2C bus. ¿Am I in the way?. I can not see where it is exactly.

#include <device.h>
#include <drivers/display.h>
#include <lvgl.h>
#include <stdio.h>
#include <string.h>
#include <zephyr.h>

#define LOG_LEVEL CONFIG_LOG_DEFAULT_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(app);

void main(void)
{
	uint32_t count = 0U;
	char count_str[11] = {0};
	const struct device *display_dev;
	lv_obj_t *hello_world_label;
	lv_obj_t *count_label;

	display_dev = device_get_binding(CONFIG_LVGL_DISPLAY_DEV_NAME);

	if (display_dev == NULL) {
		return;
	}

	if (IS_ENABLED(CONFIG_LVGL_POINTER_KSCAN)) {
		lv_obj_t *hello_world_button;

		hello_world_button = lv_btn_create(lv_scr_act(), NULL);
		lv_obj_align(hello_world_button, NULL, LV_ALIGN_CENTER, 0, 0);
		lv_btn_set_fit(hello_world_button, LV_FIT_TIGHT);
		hello_world_label = lv_label_create(hello_world_button, NULL);
	} else {
		hello_world_label = lv_label_create(lv_scr_act(), NULL);
	}

	lv_label_set_text(hello_world_label, "Hello world!");
	lv_obj_align(hello_world_label, NULL, LV_ALIGN_CENTER, 0, 0);

	count_label = lv_label_create(lv_scr_act(), NULL);
	lv_obj_align(count_label, NULL, LV_ALIGN_IN_BOTTOM_MID, 0, 0);

	lv_task_handler();
	display_blanking_off(display_dev);

	while (1) {
		if ((count % 100) == 0U) {
			sprintf(count_str, "%d", count/100U);
			lv_label_set_text(count_label, count_str);
		}
		lv_task_handler();
		k_sleep(K_MSEC(10));
		++count;
	}
}

I have added the shield in CMakeList

# SPDX-License-Identifier: Apache-2.0

cmake_minimum_required(VERSION 3.20.0)

find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
project(lvgl)

FILE(GLOB app_sources src/*.c)
target_sources(app PRIVATE ${app_sources})
set(ssd1306_128x32)

Thanks for your time