Loading fonts at runtime ? (bin-file already created)

Sn00zerman · September 12, 2020, 2:03pm

Hello,

While browsing the lvgl documentation, I stumbled up on some information on how to load a font at runtime:
I can’t include links in my postings,so look at docs . lvgl . io and look for lv_font_load
I already made a bin-file from the font I want to use, and uploaded it to the same directory as where my .py-files are on my device. I already had a look at some forum topics, but they didn’t make me any smarter

How can I use this functionality in MicroPython ?
A simple example would be nice

Best regards from Belgium,
Kris

amirgon · September 12, 2020, 7:43pm

Hi @Sn00zerman!

Thanks to the work of @imliubo and @mhepp, we now have a Micropython example for loading fonts dynamically!

github.com

lvgl/lv_binding_micropython/blob/master/examples/Dynamic_loading_font_example.py

#
# Command line for running this example on the unix port from examples directory:
# MICROPYPATH=./:../lib ../../../ports/unix/micropython -i Dynamic_loading_font_example.py
#

import lvgl as lv
import fs_driver

lv.init()

# display driver init...

import display_driver # Default implementation. Replace by your driver

# FS driver init.
fs_drv = lv.fs_drv_t()
fs_driver.fs_register(fs_drv, 'S')

'''
　load the font file from filesystem(For me is flash )

This file has been truncated. show original

Sn00zerman · September 13, 2020, 8:56am

Thanks for this quick response

I’m however unable to use this, I get: ‘module’ object has no attribute ‘font_load’.
I think I need a new firmware ?
(i’m running “MicroPython v1.9.4-2811-gf0cb439ba-dirty on 2020-07-23; LilyGO-TTGO-T-Watch-2020-V1 with ESP32” from https://github.com/OPHoperHPO/lilygo-ttgo-twatch-2020-micropython

I think it’s time to learn to compile my own firmware then …
(I was able to do this in the past, but whatever I do (edition the partions.csv etc …),
I always end un with a 2 MB filesystem, and 512KB Ram, and when I use the pre-compiled firmware, I have 13 MB filesystem and 3 MB Ram)

Not strictly lvgl related, but somebody is also using the TTGO T-watch 2020, and is willing to share his compiled firmware ?

best regards,
Kris
Best regards,
Kris

amirgon · September 13, 2020, 10:16am

Yes you need an updated version.
lv_micropython is based on Micropython v.13 and an up to date LVGL which supports dynamic font loading.

You could also try opening a GitHub issue on https://github.com/OPHoperHPO/lilygo-ttgo-twatch-2020-micropython and ask him to update his libraries.