i2c_oled

| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- | -------- |

# I2C OLED example

[esp_lcd](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/lcd.html) supports I2C interfaced OLED LCD, whose color depth is usually 1bpp.

This example shows how to make use of the SSD1306 panel driver from `esp_lcd` component to facilitate the porting of LVGL library. In the end, example will display a scrolling text on the OLED screen.

## LVGL Version

This example is using the **LVGL8** version. For use it with LVGL9 version, please delete file [sdkconfig.defaults](sdkconfig.defaults) and change version to `"^9"` on this line in [idf_component.yml](main/idf_component.yml) file:
```
lvgl/lvgl: "^8"
```

NOTE: When you are changing LVGL versions, please remove these files and folders before new build:
- build/
- managed_components/
- dependencies.lock
- sdkconfig

## How to use the example

### Hardware Required

* An ESP development board
* An SSD1306 OLED LCD, with I2C interface
* An USB cable for power supply and programming

### Hardware Connection

The connection between ESP Board and the LCD is as follows:

```
      ESP Board                       OLED LCD (I2C)
+------------------+              +-------------------+
|               GND+--------------+GND                |
|                  |              |                   |
|               3V3+--------------+VCC                |
|                  |              |                   |
|               SDA+--------------+SDA                |
|                  |              |                   |
|               SCL+--------------+SCL                |
+------------------+              +-------------------+
```

The GPIO number used by this example can be changed in [lvgl_example_main.c](main/i2c_oled_example_main.c). Please pay attention to the I2C hardware device address as well, you should refer to your module's spec and schematic to determine that address.

### Build and Flash

Run `idf.py -p PORT build flash monitor` to build, flash and monitor the project. A scrolling text will show up on the LCD as expected.

The first time you run `idf.py` for the example will cost extra time as the build system needs to address the component dependencies and downloads the missing components from registry into `managed_components` folder.

(To exit the serial monitor, type ``Ctrl-]``.)

See the [Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/index.html) for full steps to configure and use ESP-IDF to build projects.

### Example Output

```bash
...
I (0) cpu_start: Starting scheduler on APP CPU.
I (345) example: Initialize I2C bus
I (345) example: Install panel IO
I (345) example: Install SSD1306 panel driver
I (455) example: Initialize LVGL library
I (455) example: Register display driver to LVGL
I (455) example: Install LVGL tick timer
I (455) example: Display LVGL Scroll Text
...
```