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40 lines
2.1 KiB
Markdown
40 lines
2.1 KiB
Markdown
# LittlevGL Arduino library
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This library allows to use LittlevGL (v6.x) as an Arduino library. Library can be installed via Arduino IDE Library Manager or as an .ZIP library.
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## Example
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There is simple example which uses https://github.com/Bodmer/TFT_eSPI library as an 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.
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LittlevGL library has its own configuration file in `lv_conf.h` file, which is locatd in LittlevGL library folder. Please get in mind to check that corresponding resolutions in LVGL configuration match the ones in TFT_eSPI and with physical resolution of your display.
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Example result should look like this:
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Tested with:
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* My own ESP32 board, module ESP32 Wroom
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* PC OS: Linux, Ubuntu 18.04 LTS
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* IDE: Arduino IDE 1.8.9
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* ESP32 Core: 1.0.2
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## Debugging
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In case of trouble there are debug information inside LVGL. In the `ESP32_TFT_eSPI` example there is `my_print` method, which allow to send this debug information to the serial interface. To enable this feature you have to edit `lv_conf.h` file and enable logging in section `log settings`:
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```c
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/*Log settings*/
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#define USE_LV_LOG 1 /*Enable/disable the log module*/
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#if USE_LV_LOG
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/* How important log should be added:
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* LV_LOG_LEVEL_TRACE A lot of logs to give detailed information
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* LV_LOG_LEVEL_INFO Log important events
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* LV_LOG_LEVEL_WARN Log if something unwanted happened but didn't caused problem
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* LV_LOG_LEVEL_ERROR Only critical issue, when the system may fail
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*/
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# define LV_LOG_LEVEL LV_LOG_LEVEL_TRACE
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```
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After enabling log module and setting LV_LOG_LEVEL accordingly the output log is sent to he `Serial` port @ 115200 Bd. After each line sent there is 100ms delay to allow the serial transfer to finish. This delay can be commented out in `my_print` method.
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