Linux Device Drivers, 3rd Edition by Jonathan Corbet Alessandro Rubini & Greg Kroah-Hartman

Author:Jonathan Corbet, Alessandro Rubini & Greg Kroah-Hartman [Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman]
Language: eng
Format: epub
Tags: COMPUTERS / Operating Systems / Linux
ISBN: 9780596159740
Publisher: O'Reilly Media
Published: 2009-02-08T16:00:00+00:00

INTERRUPT

Interrupt endpoints transfer small amounts of data at a fixed rate every time the USB host asks the device for data. These endpoints are the primary transport method for USB keyboards and mice. They are also commonly used to send data to USB devices to control the device, but are not generally used to transfer large amounts of data. These transfers are guaranteed by the USB protocol to always have enough reserved bandwidth to make it through.

BULK

Bulk endpoints transfer large amounts of data. These endpoints are usually much larger (they can hold more characters at once) than interrupt endpoints. They are common for devices that need to transfer any data that must get through with no data loss. These transfers are not guaranteed by the USB protocol to always make it through in a specific amount of time. If there is not enough room on the bus to send the whole BULK packet, it is split up across multiple transfers to or from the device. These endpoints are common on printers, storage, and network devices.

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