usb serial controller driver

software can call this function through the deviceiocontrol () function. Xxx_read When the USB device driver is enabled, the application calls it through the readfile () function. Xxx_seek The Data Pointer of the USB device is called by the application through the setfilepointer () function. Xxx_write When a

, the serial number of the device, and so on. Its contents are given in Unicode and can be read by the client software. String descriptors are optional for USB devices.6. PipelineIn the structure of the USB system, it can be considered that the data transfer occurs directly between the USB host software and the various

, there are also some chips on the market that convert USB interfaces to serial ports. One of these chips is a serial port and the other is a USB interface, and the conversion from the serial port to the USB protocol is completed

file (Development Board---> PC)The files on the Development Board will be transferred to the/home/crliu directory on the PC.(2) B-upload read the uploaded file from here (PC---> Development Board)The PC sends files to the Development Board and needs to send the files in the/tmp directory (the directory on the PC). With this configuration, each time you send a file to the board, you only need to enter the filename, without having to enter the absolute path to the directory where the file resides

and USB core, and then does the appropriate processing.Driver Catalog drivers/usb/*Usb/serial USB Serial device driver (e.g. USB 3G card, B

Although serial communication is a common standard and widely known, some of the content involved in the driver may not be very commonly used in common applications, here, we will give a brief introduction to the Code which will be coherent later.The serial communication interface is one of the most popular communication interfaces. The simplicity of its electric

Author:Liu Hongtao, a lecturer at Huaqing vision embedded College. A Linux USB driver consists of two parts. Some are USB device controller (UDC) drivers and others are hardware-independent function drivers (such as mouse, USB flash drive,

1. Linux USB Architecture USB communication is initiated by the host. The USB device driver allocates and initializes an urb and sends it to the USB core. The USB core is changed and sent to the

(which can be supported by OTG), this driver can enable us to implement a USB port on this USB channel; it's like having PL2303 or HM340 hard Supported by USB. Of course, our device is in the presence of USB slave, the driver sup

-Upload---> Development Board)The PC sends a file to the Development Board. The file to be sent is in the/tmp directory (the directory on the PC ). After this configuration, each time you send a file to the Development BoardYou only need to enter the file name, without entering the absolute path of the directory where the file is located. Iii. LinuxHow to use USB to serial port Devices For notebook holders

Http://www.linuxjournal.com/article/7466June 1st, 2004 by Greg kroah-Harman In Software NowYou can control USB hardware without touching the kernel and even makeYour driver run on BSD-based OSes with no code changes. Greg showsWorking Example for using the cross-platform USB library, libusb. Last time we discussed how to create a simple

to building a high-level coordination mechanism on the basis of the implementation of chapter 1 Device Manager design and Chapter 4 serial port and network I/O design, and implement the matching and different communication mechanisms between devices and IO. No matter how the serial communication controller and network communication

Transferred from: http://blog.csdn.net/zkami/article/details/2496770Usb_hcd_omap_probe (const struct hc_driver *driver) (DEV/OHCI/OHCI-OMAP.C)Called by Platform_driver_register () during module initialization to initialize and Ohci_hcd_omap_driverMatch the USB host controller.-GT;USB_CREATE_HCD (driver); Create a data

of the USB driver framework in wince6.0, contains three roles. 3. the USB directory structure in wince6.0 has good support for USB. Let's take a look at what Microsoft has done. From the preceding directory structure, we can see that the USB

/ Step2, sudo modprobe pl2303 Step3, Sudo/etc/init.d/nfs-kernel-server restart STEP4, reseat USB switch serial device Step5,sudo minicom Ok. Below is For the notebook holder without serial port, do hardware development is often not a serial port and worry,

Linux supports the connection of various USB slave devices while also supporting itself as a device into other hosts. The most typical example is the Android OS phone, which plugs into a computer that can be identified as a USB stick device. For the SOC, this part directly corresponds to the operation of the USB device section. To avoid confusion with the word "d

AT91 USB Composite Driver Implementation1. Introduction The USB Composite device is a general-to-integrate, or more functions-to-one single Device.It is defined in the USB Specification Revision 2.0, as "A device which has multiple interfaces controlled independently of Each of the other ".This document introduces basi

Summary: Taking the serial port driver of the b0x Chip Based on the ARM7TDMI kernel as an example, this paper analyzes the hierarchy and mechanism of the VxWorks serial port driver, and studies the working principle of the TTY driver and the underlying SCC

. Endpoint descriptor: the endpoint address, direction, and type. It supports the maximum package size. If it is an end point of the interrupt type, it also includes the round inquiry frequency rate. In Linux kernel, USB end points are described using the usb_host_endpoint structure. The USB end point description is defined as the usb_endpoint_descriptor structure. String descriptor: other descriptors p

Intel motherboard USB 3.0 XHCI controller port configuration, 3.0 xhci Generally, Intel has two EHCI and one XHCI on the motherboard that supports USB 3.0 host controllers. This type of motherboard generally has 14 ports, and port 0-3 is shared by EHCI and XHCI, that is, port 0-3 has four switches, and the control registers of these four switches are located in t