https://twitter.com/m5stack/status/1300757391152087041

M5GFX and LovyanGFX are the same.
The basic usage of LovyanGFX is as follows.
https://github.com/lovyan03/LovyanGFX

Thank you @GoT , This is a great program.

Thank you for publishing to github.

problem

1. not able to change the label text.
2. The right side cannot be drawn.

Change DrawingBoard.cpp.

static lv_style_t style_color_label;
static lv_style_t style_size_label;
static lv_style_t style_clear_label;
static lv_style_t style_label;

void DrawingBoard::setup() {
//lv_obj_t* _size_label = lv_label_create(lv_scr_act());
_size_label = lv_label_create(lv_scr_act());

//lv_obj_add_style(_size_label, &style_label, 0);
lv_obj_add_style(_size_label, &style_size_label, 0);

//lv_obj_add_style(_clear_label, &style_label, 0);
lv_obj_add_style(_clear_label, &style_clear_label, 0);

void DrawingBoard::drawPoint(int32_t x, int32_t y) {
//_tft.drawCircle(x, y, _size, getColor());
//_tft.fillCircle(x, y, _size, getColor());
M5.Lcd.drawCircle(x, y, _size, getColor());
M5.Lcd.fillCircle(x, y, _size, getColor());

void DrawingBoard::changeSize() {
//lv_label_set_text_fmt(_size_label, "Size: %d", _size);
lv_label_set_text_fmt(_size_label, "Size: %d", _size);

void DrawingBoard::clear() {
//_tft.fillScreen(TFT_BLACK);
M5.Lcd.fillScreen(TFT_WHITE);

postscript:
All 'tft's are possible with 'M5.Lcd'.
It is possible with M5.Lcd without using TFT_eSPI.
Development environment: LVGL 8.1.0 + Arduino IDE 1.8.19

I will omit the details,
Currently, M5Stack Core2 is working with LVGL v8.1.0 and Arduino IDE.

About lv_conf.h
The following three settings are required.

lvgl-master v8.1.0 / src / lv_conf.h

1. /* clang-format off */
   #if 1 /Set it to "1" to enable content/

2. #define LV_COLOR_DEPTH 16

3. #define LV_TICK_CUSTOM 1
   #if LV_TICK_CUSTOM
   #define LV_TICK_CUSTOM_INCLUDE "Arduino.h"

Add the following to void loop ().

void loop() {
M5.update();
if(M5.BtnA.wasPressed()){M5.Lcd.setRotation(3);M5.Lcd.fillScreen(TFT_BLACK);analogMeter();}
if(M5.BtnC.wasPressed()){M5.Lcd.setRotation(1);M5.Lcd.fillScreen(TFT_BLACK);analogMeter();}

The library has been released!
It is a library that can be used in common with M5Stack / Core2 / Tough / CoreInk / Paper / StickC, CPlus.
Buttons, touch panel, IMU, 5V output on / off to external port, etc. are available. It can also be used with ESP-IDF.

https://github.com/m5stack/M5Unified

https://twitter.com/lovyan03/status/1447194068866404356

@plusulli
Mac can Downoad.
It seems to be the download method for PC or Windows.

1. DownLoad : lv_ccs811_m5stack.zip_-1.pdf

2. Delete _-1.pdf

3. Unzip the .zip
   lv_ccs811_m5stack.zip

How to run LVGL on M5Stack
https://forum.m5stack.com/topic/3613/how-to-run-lvgl-on-m5stack/1

LVGL ( Light and Versatile Graphics Library )
https://lvgl.io/

How to run LVGL on M5Stack ( ESP32 ) : 2021.06.18
https://macsbug.wordpress.com/2021/06/18/how-to-run-lvgl-on-m5stack-esp32/
( Demo of M5Stack and M5Core2 )

LVGL with M5Stack Part 2 : 2021.07.03
https://macsbug.wordpress.com/2021/07/03/lvgl-with-m5stack-part-2/

CO2 monitor with M5Stack and LVGL : 2021.07.05
https://macsbug.wordpress.com/2021/07/05/co2-monitor-with-m5stack-and-lvgl/