Add new font code example needed

Micropython
1

Hello,
succeeded in writing some labels to “ESP-WROVER-KIT V4.1” which contains ili9341 display. Can set text and background colors and change text size using implemented “roboto” font. But I need a bigger font. Created font C-file (roboto_80.c) by use of online font converter and copied file to root of esp32. But what to do now? Do I have to add the C-file to lv-bindings and re-compile or ???
See down for test-program.

Thanks for response,

Peter

"""
Demo program demonstrating the capabities of LittlevGL on ESP32-WROVER-KIT_V4.1 containing ILI9341
Author: 
Date:   

"""



import lvgl as lv
import lvesp32
import espidf as esp
from ili9341 import ili9341 # Import ILI9341 driver and initialized it
import time

#Constants
MADCTL_MH = const(0x04)
MADCTL_ML = const(0x10)
MADCTL_MV = const(0x20)
MADCTL_MX = const(0x40)
MADCTL_MY = const(0x80)

PORTRAIT = MADCTL_MX
LANDSCAPE = MADCTL_MV
LV_FONT_DECLARE = "roboto_80"


#Init ESP-WROVER-KIT V4.1
lv.init()
disp = ili9341(miso=25, mosi=23, clk=19, cs=22, dc=21, rst=18, power=14, backlight=5, rot=LANDSCAPE, width=320, height=240)


#Create a style based on style_plain
mystyle = lv.style_t(lv.style_plain)
#mystyle.text.font = roboto_80 # font roboto 80 pixel
mystyle.text.font = lv.font_roboto_28
mystyle.body.main_color = lv.color_hex(0x000000) # background top color (main), 0xRRGGBB
mystyle.body.grad_color = lv.color_hex(0x000000) # background bottom color (gradient), 0xRRGGBB
mystyle.text.color = lv.color_hex(0xffffff) # text-colour, 0xRRGGBB


#Create screen and labels
scr = lv.obj()
scr.set_style(mystyle)
label1 = lv.label(scr)
label2 = lv.label(scr)


#Create content
while(1):
    label1.set_pos(20,20)
    label1.set_text("Hello World!")
    label2.set_pos(50,50)
    label2.set_text("23:59")
    # Load the screen
    lv.scr_load(scr)
    time.sleep_ms(1000)           # sleep for 1 second

    label2.set_pos(50,50)
    label2.set_text("00:00")
    # Load the screen
    lv.scr_load(scr)
    time.sleep_ms(1000)           # sleep for 1 second
2

Hi Peter!

Currently, yes.

In the future I’m going to add support for loading fonts dynamically (on runtime, without rebuilding micropython). Here is the GitHub issue for tracking this:

But don’t worry, even today adding a new font to lv_micropython is very easy:

  • Create the font (as you did) and put the font C file ( lv_font_roboto_80.c) under some lvgl dir, for example, under lvgl/src/lv_font
  • Edit lv_conf.h and add your font to LV_FONT_CUSTOM_DECLARE. You can add multiple fonts if you want to.

In your case, define it like this:

#ifndef LV_FONT_CUSTOM_DECLARE
#define LV_FONT_CUSTOM_DECLARE  LV_FONT_DECLARE(lv_font_roboto_80)
#endif
  • Build lv_micropython

If you don’t want to modify lv_conf.h, you could add the font from the make command line instead, by adding the macro to LV_CFLAGS:

LV_CFLAGS="-DLV_FONT_CUSTOM_DECLARE=LV_FONT_DECLARE(lv_font_roboto_80)"

But you don’t need both. Either change lv_conf.h or add it to the make command line.

Now you should be able to use your font on Micropython

mystyle.text.font = lv.font_roboto_80
3

Hello,
thanks for support, succeeded in implementing font and display settings (see attached picture). For arised issues i’ll make another post.

TFT_display_ESP32
TFT_display_ESP32.jpg3404×2932 684 KB

best regards,

Peter

1 Like
4

Thanks for the update. It looks very nice!
If you want, you can post more information about your project in My Projects category.

5

Done.
See: My Projects

best regards

Peter