-
USB Bulk Stack
The USB-Bulk stack has been designed to work on any embedded system with USB client controller. A hardware abstraction layer makes it possible to easily write or modify existing hardware access routines. It can be used with USB 1.1. or USB 2.0 devices. The stack consists of an embedded side, which is shipped in source-code form, and a driver for the PC, which is typically shipped as executable (sys), but is also available as source code. The purpose of the USB stack is to allow developers to quickly and painlessly develop software for an embedded device to communicate with a PC via USB. The communication is like a single, high speed, reliable channel (very similar to a TCP connection). It basically allows the PC to send data to the embedded target, the embedded target to receive these bytes and reply with any number of bytes. The PC is the USB host, the target is the USB client. The USB standard defines 4 types of communication: Control, isochronous, interrupt and bulk. Experience shows, that for most embedded devices bulk mode is the communication mode of choice. It allows usage of the full bandwidth of the USB bus.
|
