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85 lines
3.5 KiB
Markdown
85 lines
3.5 KiB
Markdown
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# Arduino
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The [LVGL library](https://github.com/lvgl/lvgl) is directly available as Arduino libraries.
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Note that you need to choose a board powerful enough to run LVGL and your GUI. See the [requirements of LVGL](https://docs.lvgl.io/master/intro/index.html#requirements).
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For example ESP32 is a good candidate to create UI's with LVGL.
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## Get the LVGL Arduino library
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LVGL can be installed via the Arduino IDE Library Manager or as a .ZIP library.
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You can [Download](https://github.com/lvgl/lvgl/archive/refs/heads/master.zip) the latest version of LVGL from GitHub and simply copy it to Arduino's library folder.
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## Set up drivers
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To get started it's recommended to use [TFT_eSPI](https://github.com/Bodmer/TFT_eSPI) library as a TFT driver to simplify testing.
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To make it work, setup `TFT_eSPI` according to your TFT display type via editing either
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- `User_Setup.h`
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- or by selecting a configuration in the `User_Setup_Select.h`
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Both files are located in `TFT_eSPI` library's folder.
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## Configure LVGL
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LVGL has its own configuration file called `lv_conf.h`. When LVGL is installed, follow these configuration steps:
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1. Go to the directory of the installed Arduino libraries
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2. Go to `lvgl` and copy `lv_conf_template.h` as `lv_conf.h` into the Arduino Libraries directory next to the `lvgl` library folder.
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3. Open `lv_conf.h` and change the first `#if 0` to `#if 1` to enable the content of the file
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4. Set the color depth of you display in `LV_COLOR_DEPTH`
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5. Set `LV_TICK_CUSTOM 1`
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Finally the layout with `lv_conf.h` should look like this:
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```
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arduino
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|-libraries
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|-lvgl
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|-other_lib_1
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|-other_lib_2
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|-lv_conf.h
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```
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## Initialize and run LVGL
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Take a look at [LVGL_Arduino.ino](https://github.com/lvgl/lvgl/blob/master/examples/arduino/LVGL_Arduino/LVGL_Arduino.ino) to see how to initialize LVGL.
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`TFT_eSPI` is used as the display driver.
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In the INO file you can see how to register a display and a touchpad for LVGL and call an example.
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## Use the examples and demos
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Note that, there is no dedicated INO file for every example. Instead, you can load an example by calling an `lv_example_...` function. For example `lv_example_btn_1()`.
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**IMPORTANT NOTE 1**
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Due to some the limitations of Arduino's build system you need to copy `lvgl/examples` to `lvgl/src/examples`. Similarly for the demos `lvgl/demos` to `lvgl/src/demos`.
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**IMPORTANT NOTE 2**
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Note that the `lv_examples` library is for LVGL v7 and you shouldn't install it for this version (since LVGL v8)
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as the examples and demos are now part of the main LVGL library.
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## Debugging and logging
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LVGL can display debug information in case of trouble.
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In the `LVGL_Arduino.ino` example there is a `my_print` method, which sends this debug information to the serial interface.
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To enable this feature you have to edit the `lv_conf.h` file and enable logging in the 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 LV_USE_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 cause a problem
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* LV_LOG_LEVEL_ERROR Only critical issue, when the system may fail
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* LV_LOG_LEVEL_NONE Do not log anything
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*/
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# define LV_LOG_LEVEL LV_LOG_LEVEL_WARN
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```
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After enabling the log module and setting LV_LOG_LEVEL accordingly, the output log is sent to the `Serial` port @ 115200 bps.
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