Note

This is the documentation for the latest development branch and may refer to features that are not available in released versions. If you are looking for the documentation for a specific release, use the drop-down menu on the left and select the desired version.

Display Demo

Overview

The VO (Video Output) module reads video and graphics data from memory and sends them to the selected display device. The chip supports multiple display and write-back paths, video layers, and graphics layers. The VO demos are intended to verify these interfaces and features.

Functional Description

VO Functions

This sample demonstrates the following VO capabilities:

• multi-output support for HDMI, LCD, and similar display devices

• layered composition of video and graphics

• OSD (On-Screen Display) text and graphics overlay

• configurable output resolution

• configurable refresh rate

Supported Output Devices

• HDMI, including common high-resolution outputs such as 1080p

• LCD panels supported by the board configuration

• MIPI output where applicable

Video Layers and Graphic Layers

• video layers for video streams

• graphic layers for OSD and UI-style content

• mixed-layer display modes

Source Location

The display-related demos available in the current SDK are:

• src/rtsmart/examples/mpp/sample_vo_video

• src/rtsmart/examples/mpp/sample_vo_osd

• src/rtsmart/examples/mpp/sample_vo_mix_order

Usage

Build Method

From the K230 RTOS SDK root, run make menuconfig. It is recommended to complete at least these two sets of configuration before rebuilding the firmware:

1. Enable the target display driver, configure pins, and select the target panel driver under MPP Configuration -> Display Configuration.

2. Enable the display-related samples under RT-Smart UserSpace Examples Configuration.

If you are adding a new panel driver, first follow how_to_add_display.md to finish the menuconfig setup and panel integration, then return to this page to run the sample.

Run Example

./sample_vo_video.elf <connector_type> [options]

Parameter Description

Parameter	Description	Range
connector_type	connector type	use the output of list_connector on the target board

Expected Result

After the program starts, it will:

1. initialize the VO module

2. configure the output device

3. create the required video and graphics layers

4. enable OSD display

5. start video output

Representative output:

Display Demo
=============

Initializing VO module...
VO initialized successfully

Configuring output device...
Connector type: 101 (HDMI)
Output resolution: 1920x1080 @ 60Hz

Creating video layers...
Layer 0: Created
Layer 1: Created

Setting up OSD...
OSD configured successfully

Starting video output...
Video output started!
Press Ctrl+C to stop.

Tip

Use list_connector to view the connector types and enum values actually supported by the current firmware. When adding a new panel, make sure it has been enabled in menuconfig and built into the image before validating it with the sample. For detailed VO interfaces, refer to the Display API documentation.