3com drivers

Http://21cnbao.blog.51cto.com/109393/336263 1.1 Device Driver core layer and examples in the object-oriented programming, you can define a base class for a similar thing, specific things can inherit the functions in this base class. If the implementation of a function of the inherited object is the same as that of the base class, it can directly inherit the functions of the base class. On the contrary, it can be overloaded. This object-oriented design method greatly improves the code reusable ab

From one point of view, the role of a device driver is to provide a mechanism, not a policy. When writing drivers, programmers should pay particular attention to the following basic concept: When writing kernel code to access hardware, do not impose any specific policy on the user. Because different users have different needs, the driver should handle the problem of how to make the hardware available, and how to use the hardware problem left to the up

reached 66MHz or even 133MHz Equipped with a 32-bit data bus, and the specification already includes 64-bit extensions Platform independence as much as possible simplifies the task of adding and removing peripherals to the system PCI device is a jumper-free device that can be configured automatically during the boot phase PCI Addressing each PCI peripheral is identified by a bus number, a device number,

Excerpt from: http://blog.chinaunix.net/uid-20799298-id-99675.htmlThe original text is writing device driver in linux:a Brief tutorial.This article focuses on three examples to explain the Linux driver, so that novice quickly, from the code layer to understand what is the Linux device driver.This article is a note, in general translation of the first two parts of the article, namely the first two examples, these two examples can be successfully run correctly. File: Writing device

is the error may instead be Reported As-eproto Or-eilseq. From this we can judge that this error is related to the timeout of the USB device. Reporting this error in the Hub_port_init part of the DRIVERS/USB/CORE/HUB.C, a timeout occurred due to Usb_get_device_descriptor acquiring USB device information. This can basically determine three kinds of cases, 1, USB devices and interface problems, 2, USB core has problems, 3, USB driver have problems. W

Tags: exception TCO declaration program trace MySQL database connection URL jdkUnderstand:When a Java application connects to a database, the driver communicates with the database vendor through JDBC (jdbc is the JDK ) and the driver communicates with the database.Drivers provided by the database vendor:There are various types of databases, such as MySQL, Oracle, etc., and different databases have different drivers. So before you do anything else, fir

Under Windows 9x, drivers can be divided into sound card drivers, graphics drivers, mouse drivers, motherboard drivers, network device drivers, printer drivers, scanner

The audio system in Android is using the ALSA system architecture. Asoc--alsa System on Chip, is built on the standard ALSA drive layer, in order to better supportA software system for audio codec in embedded processors and mobile devices, ASOC is divided into three parts: machine, platform and codec in audio device drivers.Codec part: Responsible for audio decoding, this part of the code is completely non-platform-independent (the device is provided by the original), it contains some audio cont

To understand the Linux PCI device driver, first understand that the so-called Linux PCI device driver actually includesLinux PCI device drivers and Device Drivers. I do not know whether the reader understands this sentence. I think this sentence is very important. For drivers like PCI and USB, we must understand this concept, in order to understand how to look a

How to compile a Linux Device Driver 2006-12-10 16:52:36 LinuxIs a variant of the UNIX operating system. The principle and idea of writing a driver in Linux is similar to that in other UNIX systems, however, the drivers in the DoS or window environment differ greatly. In a Linux environment, the driver is designed with simple ideas, convenient operations, and powerful functions. However, it only supports a small number of functions and can only rely o

Development of uClinux drivers Basic knowledge: Kernel space ------- user space (memory application data exchange, etc) Device ---- Device Driver ----- device No. Driver category: character device block device network device Interrupt handling Driver development for uClinux and Linux is the same, but the debugging method is different. Learning driver development for uClinux is the process of learning the driver development for Linux. Linux driver debu

I have been learning device-driven programming for some time and have written several drivers. So I have a new understanding and understanding of the device driver. I have been learning device-driven programming for some time and have written several drivers. So I have a new understanding and understanding of the device driver.★What is a driver? When I first started learning the device driver, there were a

Linux device driversOne, the role of device-drivenThe most popular explanation for device drivers is " Drive hardware Device Actions ". Drive and the underlying hardware directly to deal with, according to the specific work of the hardware device, read and write device registers, the completion of the device polling (polling (Polling) is a CPU decision how to provide peripheral equipment services, also known as "programmed output in" (programmed I/O).

The function of counting the number of words is encapsulated in the Linux driver. The Linux system maps each driver into a single file. These files are called device files or drive files and are stored in the/dev directory. The steps for writing a Linux driver are as follows:1. Build Linux drive skeleton (load and unload Linux drivers);2, registration and cancellation of equipment documents;3, specify the information related to the drive;4, specify th

Brief introduction The name of the TTY device is abbreviated from the previous telex, originally referred to as a physical or virtual terminal connected to a UNIX system The core of the Linux TTY driver is immediately below the standard character device driver layer and provides a range of functions that are used as interfaces by terminal type devices There are three types of TTY drivers: console, serial, and Pty /proc/tty

Hardware vendors usually update the device's drivers regularly, to modify bugs in older drivers, improve driver compatibility, and so on, in general, newer drivers often mean better performance and more reliable stability, which is what many friends see when a vendor publishes a new driver The main reason for the system driver to be updated immediately within the

learn how to add executable programs written in C in the Android system.I. Refer to the article on writing Linux kernel drivers for Android systems on Ubuntu, and prepare the Linux drivers. Use the Android emulator to load the kernel file that contains this Linux driver, and use the ADB shell command to connect to the simulation to verify that the device file Hello exists in the/dev directory.Two. Enter th

In the Android Hardware Abstraction Layer (HAL) Overview and Learning Plan article, we briefly describe the ways in which Android systems write drivers for hardware. In short, hardware drivers are distributed on the Linux kernel, and on the other hand, in the hardware abstraction layer of user space. Next, writing a Linux kernel driver for Android on Ubuntu cited example shows how to write a driver in the L