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68 lines
3.1 KiB
Markdown
68 lines
3.1 KiB
Markdown
| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
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| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- | -------- |
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# I2C OLED example
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[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.
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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).
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## How to use the example
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### Hardware Required
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* An ESP development board
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* An SSD1306 OLED LCD, with I2C interface
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* An USB cable for power supply and programming
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### Hardware Connection
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The connection between ESP Board and the LCD is as follows:
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```text
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ESP Board OLED LCD (I2C)
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+------------------+ +-------------------+
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| GND+--------------+GND |
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| | | |
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| 3V3+--------------+VCC |
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| | | |
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| SDA+--------------+SDA |
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| SCL+--------------+SCL |
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+------------------+ +-------------------+
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```
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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.
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### Build and Flash
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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.
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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.
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(To exit the serial monitor, type ``Ctrl-]``.)
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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.
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### Example Output
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```bash
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...
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I (308) main_task: Started on CPU0
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I (318) main_task: Calling app_main()
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I (318) example: Initialize I2C bus
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I (318) gpio: GPIO[3]| InputEn: 1| OutputEn: 1| OpenDrain: 1| Pullup: 1| Pulldown: 0| Intr:0
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I (328) gpio: GPIO[4]| InputEn: 1| OutputEn: 1| OpenDrain: 1| Pullup: 1| Pulldown: 0| Intr:0
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I (338) example: Install panel IO
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I (338) example: Install SSD1306 panel driver
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I (448) example: Initialize LVGL
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I (448) LVGL: Starting LVGL task
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I (448) example: Display LVGL Scroll Text
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I (448) main_task: Returned from app_main()
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...
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```
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## Troubleshooting
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For any technical queries, please open an [issue](https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.
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