MIPI DSI LCD Panel Example

esp_lcd supports MIPI DSI interfaced LCD panel, with frame buffer(s) managed by the driver itself.

This example shows the general process of installing a MIPI DSI LCD driver, and displays a LVGL widget on the screen.

How to use the example

Hardware Required

• An ESP development board, which with MIPI DSI peripheral supported
• A general MIPI DSI LCD panel, with 2 data lanes and 1 clock lane, this example support ILI9881C and EK79007
• An USB cable for power supply and programming

Hardware Connection

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

       ESP Board                         MIPI DSI LCD Panel
+-----------------------+              +-------------------+
|                   GND +--------------+ GND               |
|                       |              |                   |
|                   3V3 +--------------+ VCC               |
|                       |              |                   |
|             DSI_CLK_P +--------------+ DSI_CLK_P         |
|             DSI_CLK_N +              + DSI_CLK_N         |
|                       |              |                   |
|            DSI_DAT0_P +--------------+ DSI_DAT0_P        |
|            DAI_DAT0_N +              + DAI_DAT0_N        |
|                       |              |                   |
|            DSI_DAT1_P +--------------+ DSI_DAT1_P        |
|            DSI_DAT1_N +              + DSI_DAT1_N        |
|                       |              |                   |
|                       |              |                   |
|              BK_LIGHT +--------------+ BLK               |
|                       |              |                   |
|                 Reset +--------------+ Reset             |
|                       |              |                   |
+-----------------------+              +-------------------+

Before testing your LCD, you also need to read your LCD spec carefully, and then adjust the values like "resolution" and "blank time" in the main file.

Configure

Run idf.py menuconfig and go to Example Configuration:

• Choose the LCD model in Select MIPI LCD model according to your board.
• Choose whether to Use DMA2D to copy draw buffer to frame buffer asynchronously. If you choose No, the draw buffer will be copied to the frame buffer synchronously by CPU.
• Choose if you want to Monitor Refresh Rate by GPIO. If you choose Yes, then you can attach an oscilloscope or logic analyzer to the GPIO pin to monitor the Refresh Rate of the display. Please note, the actual Refresh Rate should be double the square wave frequency.

Build and Flash

Run idf.py -p PORT build flash monitor to build, flash and monitor the project. A LVGL widget should 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 the ESP Component Registry into managed_components folder.

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

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Example Output

...
I (1629) example: MIPI DSI PHY Powered on
I (1629) example: Install MIPI DSI LCD control panel
I (1639) ili9881c: ID1: 0x98, ID2: 0x81, ID3: 0x5c
I (1779) example: Install MIPI DSI LCD data panel
I (1799) example: Initialize LVGL library
I (1799) example: Allocate separate LVGL draw buffers from PSRAM
I (1809) example: Use esp_timer as LVGL tick timer
I (1809) example: Create LVGL task
I (1809) example: Starting LVGL task
I (1919) example: Display LVGL Meter Widget
...

Troubleshooting

For any technical queries, please open an issue on GitHub. We will get back to you soon.