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
