esp-idf/examples/peripherals/lcd/i2c_oled/README.md
2022-01-21 11:21:38 +08:00

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# 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. For more information about porting the LVGL library, you can also refer to another [lvgl porting example](../i80_controller/README.md).
## 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
...
```
## Troubleshooting
For any technical queries, please open an [issue] (https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.