u2f device

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0915-----Linux Device-driven learning note----------A simple character device driver

0. Preface  Graduate life all are on the right track, I also started a new study, because really do not want to make storage, so decided to study with the elder brother device driver, read the book two weeks, finally a little clue, began to record it!1. Preparatory workA) View the kernel versionUname-rb) Install kernel source tree (http://www.cnblogs.com/Jezze/archive/2011/12/23/2299871.html)  Download the source code in www.linux.org, here is the. xz

The difference between a Linux character device and a block device

Devices in the system that can randomly (and do not need to sequentially) access fixed-size data slices (chunks) are called block devices, which are called blocks. The most common block devices are hard disks, and in addition, there are many other block devices, such as floppy drives, CD-ROM drives, flash memory, and so on. Note that they are all used in a way that installs the file system-this is also the general way to access the block device.Another basic

Device object ------ device name

Device object (device_object) --------------- main Member I. device object (device_object) Kd> dt _ device_objectNtdll! _ Device_object+ 0x000 type: int2b+ 0x002 size: uint2b+ 0x004 referencecount: int4b+ 0x008 driverobject: ptr32 _ driver_object; driver object of the device+ 0x00c nextdevice: ptr32 _ device_object; points to the next

Linux terminal device: System Terminal Device

The tty core code tty_io.c contains the following lines of code: /* * Ok, now we can initialize the rest of the tty devices and can count * on memory allocations, interrupts etc.. */static int __init tty_init(void){ cdev_init(tty_cdev, tty_fops); if (cdev_add(tty_cdev, MKDEV(TTYAUX_MAJOR, 0), 1) || register_chrdev_region(MKDEV(TTYAUX_MAJOR, 0), 1, "/dev/tty") Several system-level terminal devices are created here. They are not real physical devices. Each of them creates these

Linux Device Driver-character Device Driver

The biggest feature of Linux devices is that device operations are like file operations. In the application layer, a hardware device is just a device file. Applications can operate hardware devices like operating files, such as open (), close (), read (), and write. Below is a simple implementation of the character device

Azure IoT technology research series 3-device-to-cloud, cloud-to-device communications, azureiot

Azure IoT technology research series 3-device-to-cloud, cloud-to-device communications, azureiot In the previous blog, we registered the simulated device to Azure IoT Hub: We got the unique identifier of the device. Azure IoT technology research series 2-device registration

Linux Device Driver Programming-complex Device Driver

Linux Device Driver Programming-Linux general technology-Linux programming and kernel information-complex device driver-the following is a detailed description. The complex device drivers mentioned here involve PCI, USB, network devices, Block devices, and so on (strictly speaking, these devices are not in the same concept, for example, they are tied with Block d

Rt-thread device driver Component pin device

In the Rt-thread 2.0.0 formal version of the introduction of PIN devices as miscellaneous devices, its device driver files pin.c in Rt-thread-2.0.1\components\drivers\misc, mainly for the operation of Chip Gpio, such as light led, Keys and so on. At the same time for the corresponding chip platform, you need to write the underlying GPIO driver, such as GPIO.C.One, in PIN.C defines a static PIN device object

IOCTL is a function used by the device driver to manage the device's I/O channels.

I. What is IOCTL?IOCTL is a function used by the device driver to manage the device's I/O channels. The management of the I/O channel is to control some features of the device, such as the Serial Transmission baud rate and the motor speed. The number of calls is as follows: Int IOCTL (int fd, IND cmd ,...); FD is the File Identifier returned by the open function when the user program opens the

Device number and device file "Go" in Linux

This article was reproduced from: http://blog.csdn.net/ymangu666/article/details/39292651Primary, secondary device numberThe application can access the actual device by reading and writing to the device files in the/dev directory.1) Each device file corresponds to two device

Oracle rac ocr device: PROC-26: Error [Device or resource busy] [16]

[Oracle @ node1 crsd] $ crs_stat-t CRS-0184: Cannot communicate with the CRS daemon. [Oracle @ node1 crsd] $ crsctl check crs Failure 1 contacting CSS daemon Cannot communicate with CRS Cannot communicate with EVM [Root @ node1 crs] # ps-ef | grep crs Root 3926 1 0 :46? 00:00:00/bin/sh/etc/init. d/init. crsd run Root 29408 25855 0 00:00:00 pts/1 grep crs [Root @ node1 bin] #./racgvip There is no VIP name [Root @ node1 crsd] #/etc/init. d/init. crs stop Shutting down Oracle Cluster Ready Ser

Eclipse Debug Android App if you choose "Use same device for future launches", you will never be able to select another device.

After the crazy batch of a vendor's multimedia control app how rotten, bombast himself to do a minute thing. Of course, to do a very easy, more than their rotten software is still confident. The process encountered various pits, one of which was as followsJust start with a tablet to debug, always pop up the window to select the device, so tick "Use same device for the future launches", so eclipse by default

Linux character device-simple character device model

Linux character device-simple character device model Linux character Devices I. Use the character Device Driver 1. Compile/install the driverIn Linux, drivers generally use the program structure of the kernel module for encoding. Therefore, the essence of compiling/installing a driver is to compile/install a kernel module. 2. Character

Linux device-Driven development paradigm, Linux driver example, Linux device driver Detailed example example Song Baohua version of the CD-ROM driver source code, test compilation through the introduction of learning to use __php

/*====================================================================== A Globalmem Driver As an example of char device drivers There are two same globalmems in this driver This example was to introduce the function of File->private_data The initial developer of the original code is Baohua Song ======================================================================*/ #include #include #include #include #include #include #include #include #include #in

can display the Android device selection list and enter the shell script for the specified Android device console

If you have multiple Android devices (including Android emulators) connected to your PC, you will need to use the Adb-s DeviceID shell when you enter the console. More trouble, this article has written a shell script file (need to be used under Linux or OS X, Windows needs to be newly written with bat or cmd).The basic idea is to use the ADB devices command to scan how many Android devices are connected to the PC, then intercept the device name from t

Device security and device testing for IP network routers

the unprecedented security threat. There are two security threats to IP network, one is the security of host (including user host and application server), and the other is the security of network itself (mainly network equipment, including routers, switches, etc.). The security threat perceived by a user host is primarily an attack on a particular operating system (primarily a Windows system), known as a virus. Network devices are mainly faced with the attack based on TCP/IP protocol. This pap

Dib (device-independent Bitmap) device-independent bitmap

Bitmap has two types: Device-related Bitmap (DDB) and device-independent Bitmap (DIB ). DDB bitmap is common in earlier Windows systems (before Windows 3.0). In fact, it is unique. However, with the development of the display manufacturing technology and the diversity of display devices, some inherent problems of DDB bitmap began to emerge. functions such as bitblt () are based on DDB bitmap. For example, i

Capture USB packets and control USB device ---- Relay Device

During the project development, we need a USB-to-relay device to control the wireless transmitter device when the switch is enabled. When purchasing the device, the sourcing department buys a batch of devices without knowing the operating environment of the relay device, later, we found that the

How do I uninstall a device in Device Manager in Windows 8?

1, the system under the same time hold down the keyboard "Windows" and "X" key to open the System menu, select "Device Manager." See figure below 2, Device Manager to select the device to uninstall the double-click, pop-up Drop-down menu will appear to uninstall the driver. Right-click "Uninstall" on the selected

How to uninstall a device in Device Manager in WINDOWS8

1, the system under the same time hold down the keyboard "Windows" and "X" key to open the System menu, select "Device Manager." See figure below 2, Device Manager to select the device to uninstall the double-click, pop-up Drop-down menu will appear to uninstall the driver. Right-click "Uninstall" on the selected

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