02-Quick_Start_Guide

This guide aims to help users quickly get started with the motherboard, covering power-on, display connection, debug serial port, ADB, SSH connections, and more.

Powering On the Board

Power Supply Methods

The K4B supports TYPE-C 5V power supply, as shown below:

image-20250520101200428

LED Status

The development board is equipped with two LEDs. By default:

• Green LED: Power indicator (remains lit when powered on).

• Blue LED: Heartbeat indicator (blinks continuously after the kernel boots).

Troubleshooting:

• If the power indicator is off, check the power supply.

• If the heartbeat indicator does not blink, the system may be malfunctioning.

Display

The motherboard supports LVDS and MIPI displays.

• The default system is configured for a 7-inch LVDS screen. To switch to other displays, burn the corresponding image by following Image Burning.

Important: Always power off the motherboard before connecting a display.

Supported MIPI Displays

Model	Size	Resolution	Touch Support
AT101DS40I	10.1-inch	800x1280	Y
MX101BA1340	10.1-inch	800x1280	Y
MX080B2140	8.0-inch	800x1280	Y
F050008M01	5.0-inch	720x1280	Y

Supported LVDS Resolutions

Resolution	Touch Support
1024x600	Y

Included 7-inch LVDS Screen:

• Model: MX070IBC

Hardware Wiring:

Debug Serial Port

Baud Rate

Set the debug serial port baud rate to 115200.

Debug Cable Description

The provided debug cable has four wires:

• Red: VCC (do not connect)

• Green: TX

• White: RX

• Black: GND

Connection: Only connect TX, RX, and GND. Ensure your debug tool supports 115200 baud rate.

Serial port cable

Debug Pins on the Board

The K4B debug pins are a separate 3-pin header (not part of the 30-pin expansion header):

Wiring Method:

Serial Terminal Software Setup (MobaXterm)

Download:

• Internal path: 5-DevelopmentTools\UART_DebugTool\MobaXterm_Portable_v20.3.zip

• Official site: https://mobaxterm.mobatek.net/

Configuration Steps:

1. Create a new session.

2. Select "Serial" as the session type.

3. Choose the COM port (check in Windows Device Manager > Ports).

4. Set baud rate to 115200.

5. Start the session.

image-20250509173628697

ADB

ADB (Android Debug Bridge) is a debugging tool for Android systems. It supports USB or network connections for app installation, file transfer, and command execution.

• For usage details, see ADB_Tutorial

SSH

SSH (Secure Shell) enables secure remote access over a network.

• To connect, obtain the board’s IP via the serial port or router admin page.

• For instructions, see SSH

image-20250411103217477

FAQ

Power Supply Issues

Symptom: The green LED dims or flickers when connecting high-power peripherals, causing system instability. Solution: Ensure the power supply meets the total power requirements of all connected peripherals.