38 lines
2.0 KiB
Markdown
38 lines
2.0 KiB
Markdown
|
# LVGL Arduino examples
|
||
|
|
|
||
|
|
LVGL can be installed via Arduino IDE Library Manager or as an .ZIP library.
|
||
|
|
It will install [lv_exmaples](https://github.com/lvgl/lv_examples) which contains a lot of examples and demos to try LVGL.
|
||
|
|
|
||
|
|
## Example
|
||
|
|
|
||
|
|
There are simple examples which use the [TFT_eSPI](https://github.com/Bodmer/TFT_eSPI) library as a TFT driver to simplify testing.
|
||
|
|
To get all this to work you have to setup TFT_eSPI to work with your TFT display type via editing the `User_Setup.h` file in TFT_eSPI library folder, or by selecting your own configurtion in the `User_Setup_Select.h` file in TFT_eSPI library folder.
|
||
|
|
|
||
|
|
LVGL library has its own configuration file called `lv_conf.h`. When LVGL is installed to followings needs to be done to configure it:
|
||
|
|
1. Go to directory of the installed Arduno libraries
|
||
|
|
2. Go to `lvgl` and copy `lv_conf_template.h` as `lv_conf.h` next to the `src` folder.
|
||
|
|
3. Open `lv_conf.h` and change the first `#if 0` to `#if 1`
|
||
|
|
4. Set the resolution of your display in `LV_HOR_RES_MAX` and `LV_VER_RES_MAX`
|
||
|
|
5. Set the color depth of you display in `LV_COLOR_DEPTH`
|
||
|
|
6. Set `LV_TICK_CUSTOM 1`
|
||
|
|
|
||
|
|
## Debugging
|
||
|
|
|
||
|
|
In case of trouble there are debug informations inside LVGL. In the `ESP32_TFT_eSPI` example there is `my_print` method, which allow to send this debug informations to the serial interface. To enable this feature you have to edit `lv_conf.h` file and enable logging in section `log settings`:
|
||
|
|
|
||
|
|
```c
|
||
|
|
/*Log settings*/
|
||
|
|
#define USE_LV_LOG 1 /*Enable/disable the log module*/
|
||
|
|
#if LV_USE_LOG
|
||
|
|
/* How important log should be added:
|
||
|
|
* LV_LOG_LEVEL_TRACE A lot of logs to give detailed information
|
||
|
|
* LV_LOG_LEVEL_INFO Log important events
|
||
|
|
* LV_LOG_LEVEL_WARN Log if something unwanted happened but didn't cause a problem
|
||
|
|
* LV_LOG_LEVEL_ERROR Only critical issue, when the system may fail
|
||
|
|
* LV_LOG_LEVEL_NONE Do not log anything
|
||
|
|
*/
|
||
|
|
# define LV_LOG_LEVEL LV_LOG_LEVEL_WARN
|
||
|
|
```
|
||
|
|
|
||
|
|
After enabling log module and setting LV_LOG_LEVEL accordingly the output log is sent to the `Serial` port @ 115200 Bd.
|