Focusing on practical applications, this guide covers programming and interfacing with various serial ports, including PC COM ports and USB virtual COM ports. It explores using .NET's SerialPort class for communication and offers insights on upgrading RS-232 designs to USB or wireless networks. The book features example circuits and code for quick project initiation, while also providing installation and maintenance tips to ensure reliable operation and effective problem tracking for staff.
This developer’s guide for designers and programmers of mass-storage devices that use the Universal Serial Bus (USB) interface provides developers with information on how to choose storage media, interface the media to a microcontroller or other CPU, and write device firmware to access the media and perform USB communications. Comparisons of popular storage-media options to help users choose a media type for a project are included, and the types described cover hard drives and flash-memory cards such as the MultiMediaCard (MMC), Secure Digital (SD) card, and CompactFlash card. Helpful tips on developing an embedded host that can access USB mass-storage devices are also covered.
Developers who want to access USB devices from their embedded systems will find a helpful resource in USB Embedded Hosts: The Developer’s Guide. This new book from the author of USB Complete shows how small systems can take advantage of the same wealth of USB devices available to conventional PCs. The book begins with a review of USB host communication protocols. Readers then learn which USB host requirements are relaxed for embedded systems and what new requirements some embedded systems must meet. To help in selecting a development platform, the book explores available hardware and software for USB host communications in small systems. The heart of the book focuses on communicating with USB devices. The topics (with example code) include USB drives, keyboards, virtual serial ports, network bridges, mics, speakers, video cameras, and printers, plus devices that don’t fit defined USB classes. Also discussed are systems that support both USB host and device functions. The example code is written for the BeagleBoard-xM open development board using a distribution of Linux targeted to small systems. Also covered is how to use Linux commands and utilities to learn about, monitor, and debug communications with USB devices.
Der Universal Serial Bus bietet eine einfache und effiziente Schnittstelle für alle Arten von Peripheriegeräten. Aber die Einfachheit für die Anwender wird zur Herausforderung für die Entwickler von USB-Geräten. Jan Axelson erläutert in USB 2.0. Handbuch für Entwickler ausführlich das Design und die Programmierung von USB-Geräten. Zunächst beschreibt sie das notwendige Hintergrundwissen: Datenübertragung, Transfertypen und Enumerierung. Im Hauptteil des Buches werden dann Themen wie Controller-Chips, Firmware, Host- und Hub-Kommunikation, sowie Energieverwaltung und Stromversorgung praxisnah erläutert. Die Erklärungen zur Kommunikation von Visual Basic- und Visual C++-Anwendungen mit USB-Geräten machen dieses Buch für Entwickler besonders wertvoll. Die Neuauflage ist vollständig aktualisiert und behandelt auch die aktuellen Windows-Versionen und neue Controller-Chips.
