Whow,
Many thanks Pete.
Will do that. Will let you updated. Because of holidays, it might take 1…3 weeks.
Greetings from the Netherlands
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To go this way with this very little effort, Thank you a lot. 
It works great, including touch. On 16MHz and no glitching.
I’ll start analyzing what I have here.
The picture is the project with a changed ‘chart size’ to 600x400 px. Just to use the screen size. (This however, leads to using all cpu power. But thats ok.)
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Hello @pete-pjb
Using the demo, and getting acquainted with LVGL I have a few questions.
Overwriting a folder content might introduce some problems I have, you might recognize. Thats why I ask you these questions.
I want to introduce a different font on the screen in “rgb_lcd_example_main.c”. After the following things:
-
Create a lv_conf.h file ‘next’ to the lvgl directory. (That is for me a confusing description in the documentation.)
-
Enable another font in lv_conf.h, in my example: “#define LV_FONT_MONTSERRAT_20 1”
-
Add following rather non-fancy code at the end in “lvgl_demo_ui.c”:
lv_style_init(&styleScrolltext);
lv_style_set_text_color(&styleScrolltext, lv_color_make(255, 255, 0));
lv_style_set_text_font(&styleScrolltext, &lv_font_montserrat_20);lv_obj_t *label = lv_label_create(scr);
lv_obj_add_style(label, &styleScrolltext, LV_PART_MAIN);
lv_label_set_long_mode(label, LV_LABEL_LONG_SCROLL_CIRCULAR);
lv_obj_set_style_text_color(label, lv_color_make(255, 255, 0), LV_STATE_DEFAULT); // by EL
lv_label_set_text(label, "This is a looong scrolling text. ");
lv_obj_align(label, LV_ALIGN_TOP_MID, 0, 0);
lv_obj_set_width(label, 100);
After this, the compiler can compile, but the linker can’t link. The message is "undefined reference to `lv_font_montserrat_20’ "
The not understood thing is that using the default font ‘lv_font_montserrat_14’ in the code above is working fine.
Any ideas?
Hi @Ernst ,
If you are using VSCode I believe you need to use the SDK Configuration Editor instead of editing lv_conf.h. From the command palette select ESP-IDF:SDK Configuration editor (menuconfig) and go to the LVGL Configuration->font usage->Enable Built-in fonts:
I hope that helps.
Kind Regards,
Pete
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Hi Pete,
Thnx again. It worked. The editor is confused as it does not recognize the new enabled fonts. But, I will find that issue.Still a lot to discover comparing this IDE with Arduino IDE.
Tip for others: Also here it is the place to switch off the performance indicator 'CPU usage and FPS count.
Greetings
Ernst
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After days of struggling with VS Code it is somehow impossible for me to understand the project setup, to reproduce the project or to create a new project. Is there a step by step manual for what you did?