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Bootstrap Yourself with Linux-USB Stack: Design, Develop, by Rajaram Regupathy

By Rajaram Regupathy

Discover ways to layout, enhance, and validate USB platforms very easily, utilizing this worthwhile source that offers a close bootstrap consultation at the Linux-USB layout and implementation. BOOTSTRAP your self WITH LINUX-USB STACK bargains a travel of the Linux-USB stack, explaining find out how to advance drivers for USB machine and host controllers on Linux. It strikes directly to discover the interfaces and knowledge buildings of a USB module with UML diagrams, concluding every one bankruptcy with a pattern implementation that applies the data simply coated. A finished examine a few of the instruments and strategies on hand on Linux to validate a USB method is additionally supplied. utilizing an easy writing type, this booklet is a robust software for an individual studying to advance a protocol stack with right structure and layout, finally resulting in greater caliber, maintainability, and testability.

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Example text

The drivers/usb/host folder contains drivers for all USB host controllers. The drivers/usb/host/Kconfig file contains the host controller driver configuration menu options, which allow you to choose the necessary host controller interface (HCI) drivers. The host controller driver configuration depends on USB support, which you enabled earlier. The following configuration from drivers/usb/host/Kconfig shows that hostcontroller drivers depend on USB configuration. 0 high-speed devices. ko kernel module.

The following configuration from drivers/usb/host/Kconfig shows the UHCI driver configuration and its dependency. 5 illustrates the menuconfig option available as part of the UHCI menu. 5 Menuconfig option displaying UHCI option. USB Class Driver Menu Another important requirement of the Linux USB host subsystem is supporting USB classes such as Mass Storage Class devices (thumb drive) or HID devices (USB mouse). Support of these functionalities makes the USB system complete and useful to a user.

A USB bulk transfer has a USB Transfers maximum transfer size of 512 bytes, is nonperiodic, and uses any available bus bandwidth. Because bulk transfers occur only on the basis of the bandwidth available, the transfers are faster when there are large amounts of free bandwidth. A bulk pipe happens on a stream pipe, and the communication flow is either into or out of the host for a given pipe. A bulk transfer provides guaranteed data transfer with no guaranteed delivery time. A bulk transfer does retry a transfer to ensure a guaranteed delivery of data in the case of occasional delivery failure due to errors on the bus.

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