emUSB-Web

SEGGER's software library to access web servers on embedded devices via USB bulk communication.

1.Key features
2.Use cases
1. 2.1.Direct connection via USB
2. 2.2.USB headsets
3. 2.3.Printers
3.How emUSB-Web works
4.Resource Usage
5.Requirements
6.Try it now

Overview

emUSB-Web is a specialized software library designed to provide web server access on embedded devices via USB bulk communication. This solution eliminates the need for traditional network stacks, making it ideal for systems that require secure and light-weight connectivity without relying on Ethernet or Wi-Fi connections.

Devices can be accessed easily from host PCs running Linux, macOS, or Windows, with no need for additional hardware like displays or keys.

Key features

A white USB symbol is centered within a teal circle. The symbol features three lines: one vertical arrow pointing up, one branching to the right, and a circular end at the bottom, representing the connection points of a USB interface.

Web server access via USB bulk without a network stack

emUSB-Web enables secure access to the embedded device's web server using USB bulk communication. This method avoids the need for a network stack, simplifying the system and reducing memory and processing requirements.

An icon representing a computer screen displaying a USB symbol. The screen is enclosed in a circular teal background, emphasizing connectivity through USB technology.

Compatibility with existing web pages

emUSB-Web allows the use of the same web pages that are typically used in Ethernet-based products. This means developers can integrate web pages with USB-connected devices without needing to redesign or customize the web interface.

Icon of a computer chip with a puzzle piece design, set against a turquoise circular background. The image symbolizes technology and problem-solving, highlighting the concept of integration and innovation in computing.

Easy integration and minimal resource usage

emUSB-Web is designed for easy integration into existing embedded systems with minimal setup. It also uses minimal resources, which helps optimize system performance and allows it to run efficiently on devices with limited memory and processing capabilities.

Use cases

Flasher Hub-4 connected to laptop via USB cable

Direct connection via USB

Using emUB-Web, devices such as the Flasher Hub-4 can be connected to a laptop via USB, allowing users to access and configure the device through a web browser. This eliminates the need for Ethernet connectivity and provides a simple, secure, and cost-effective solution. With emUSB-Web, users can easily manage device settings and firmware updates with minimal system resources.

USB headsets

Modern noise-canceling Bluetooth headphones often feature a rechargeable lithium battery and a Micro-USB charging port. However, setup can be tricky due to limited controls and the lack of a display. Pairing and managing settings like volume limits can also be difficult.

With emUSB-Web, these settings can be easily adjusted via a web page, providing a simple, user-friendly experience without the need for a manual.

Printers

Web browsers provide an easy way to access important printer information, such as errors, page counts, and toner levels. They also make printer setup more convenient, allowing users to adjust settings like paper type, print quality, and color.

With emUSB-Web, all these configurations can be managed quickly and easily through a web page, offering a simple, intuitive experience without the need for additional software.

How emUSB-Web works

emUSB-Web enables communication between an embedded device and a host PC’s web browser through USB bulk communication. When the emUSB-Web PC application is launched and the embedded device is connected, the browser automatically opens and displays the web content provided by the device.

The image displays a web interface titled "emUSB-Web," indicating it is waiting for a USB web server device. The message shows a progress status of "(100)" and notes that it is powered by emWeb, associated with SEGGER Microcontroller GmbH. — Launch of emUSB-Web PC application

The image displays a web server interface showing system information for an RTOS. It includes details about two tasks, their IDs, priorities, context switches, task stacks, and CPU load percentages, indicating minimal usage for both tasks. The footer credits SEGGER Microcontroller GmbH. — Browser displays web content

The emUSB-Web PC application acts as a crucial intermediary by providing the necessary socket interface for data transfer between the browser and the USB device. Since current operating systems (Windows, Linux, macOS) do not support this type of direct data transfer, the emUSB-Web tool is essential for facilitating communication and ensuring smooth operation.

By using USB bulk communication and bypassing the need for a network stack, emUSB-Web offers an efficient, low-resource solution for embedded systems with limited memory and processing capabilities.

Resource Usage

The ROM usage depends on the compiler options, the compiler version, and the CPU used. The memory requirements of the emUSB-Web add-on shown in the tables below have been measured on a Cortex-M7 system.

Add-on	ROM
emUSB-Web	Approximately 500 bytes

Add-on	RAM
emUSB-Web	Approximately 100 bytes

Additionally, the resource usage of the emUSB-Device Bulk component, the resource usage of emWeb, and the resource usage of the used real time operating system should be considered.

Requirements

Name	Purpose	Purchasing
emUSB-Web	The emUSB-Web application.	emUSB-Device pricing
emUSB-Device BASE + driver	The emUSB-Device base package providing basic USB functionality.	emUSB-Device pricing
emUSB-Device BULK	Bulk communication for the target and PC.	emUSB-Device pricing
emWeb	Webserver software.	emWeb pricing