biometric driver

Call other driver functions in the driver (fastcall) Author: Lai yuping (auly) aulyp@163.com In embedded systems, some communication ports are public, such as IIC ports and serial ports. Drivers of these ports are usually written by the OEM manufacturer and tested, relatively stable. We do not need to write an IIC driver when developing drivers for other devices

This kind of driver mainly presents streaming function interfaces, including XXX_Init, XXX_Deinit, XXX_Open, XXX_Close, XXX_Read, XXX_Write, XXX_Seek, XXX_IOControl, XXX_PowerUp, XXX_PowerDown, etc, note that the preceding interfaces must be output, and XXX must contain three characters. Otherwise, an error occurs. You can manually call the RegisterDevice () and DeregisterDevice () functions to load and uninstall the

Kernel 2.6.29.4 USB devices are actually complicated, but the Linux Kernel provides a subsystem called USB core to handle most of the complicated work. Therefore, the interface between the driver and USB core is described here.In the USB device organization structure, there are four layers: device, config, interface, and endpoint.A brief description of these four layers is as follows:A device usually has one or more configurations.Configuration often

Linux Device Driver Article 2: How to implement a simple hello world Driver The previous article introduced the concept of the linux driver and the basic category of the device driver in linux and the basis and differences of each category, this article describes how to write a simple test

During hardware power-on initialization, the BIOS checks all PCI devices and assigns a physical address to each device. The address is obtained and written to the configuration space of the device through the bios, And the CPU cannot be accessed directly, the driver can map this configuration space to common memory through ioremap for CPU access. When the operating system is initialized, each PCI device is assigned a pci_dev structure and the previous

After explaining the framework of the dm9000 NIC Driver in the first blog in this series, we should analyze this "giant thing" for beginners by module. This article first explains the. Driver and. Remove branches. What? I don't know what the two things are? Please first look at the younger brother this series of first blog (http://blog.csdn.net/jarvis_xian/archive/2011/06/10/6537446.aspx ). Before introduc

★ Overall IntroductionLED driver mainly realizes the hardware drive of 4 LED lights on the TQ2440 Development Board, realizes the Pin GPIOB5, GPIOB6, GPIOB7, The high and low level setting of the GPIOB8 (the configuration of the PIN is already implemented in the COMMON-SMDK.C), the driver is called by the test program, and the LED light is illuminated by command.★ Specific Introduction 1,

Video:Driver Registration: Http://pan.baidu.com/s/1i34HcDBDevice registration: Http://pan.baidu.com/s/1kTlGkcRBus _ Device _ driver registration process? Registration flowchart? Devices generally need to be registered before they can register the driver– Now more and more hot-pluggable devices, in turn. Register the driver first, the device is registered againEqu

From: http://blog.chinaunix.net/uid-22917448-id-1765508.html ASoC Machine Driver ASoC machine driver============================== The ASoC machine (or board) driver is the code that glues together the platformAnd codec drivers.ASoC machines or board-level drivers are code that binds the platform and decoder drivers together. The machine

Before we loaded the driver is the use of instdrv this application, the principle is to write the corresponding fields in the registry, this section we manually write code to load the driver, the principle is similar:The dynamic loading of a device driver is primarily done by the Service Control Manager (MANAGER,SCM) system component . Loading and unloading NT dr

If prompted as shown in the installation650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/80/E8/wKioL1dEV62wy0KDAADDzdag63w006.jpg "/>After the installation cannot be completed, the network adapter is not detected, such as.650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/80/EA/wKiom1dEVruTsLvsAACJJb8syHA886.jpg "/>the NIC driver needs to be loaded into the ISO to identify the NIC driver a

[Video] development secrets of Embedded Linux/Android drivers (3) camera driver development and android driver development Secrets of Embedded Linux/Android driver development (3) camera driver development Topic introduction:This topic provides an in-depth analysis of the Android mobile phone camera components, so tha

1. What is Framebuffer?(1) framebuffer frame buffer (one screen data) (FB) is a virtual device in the Linux kernel, Framebuffer provides a unified standard interface display device to the application layer. Frame buffer (framebuffer)is an interface provided by Linux for display devices, a device that abstracts the graphics memory, allowing the upper-level application to read and write directly to the display buffer in graphical mode. This operation is abstract and uniform. UseYou don't have to w

The previous article introduced the concept of Linux drive, and the basic classification of device drivers under Linux and the basis and difference of each classification, this article describes how to write a simple test driver like Hello World. and the only function of this driver is to output Hello world.Before writing a specific instance, let's take a look at an important function of the debug program u

We often delete the computer does not use software, the network card driver accidentally deleted. Delete the network card driver can not be downloaded on the Internet drive but your computer does not have a backup drive, there is no system disk, can not restore the system, now how to restore the network card driver? 1 If you are manually uninstalling the NIC

After installing the system does not have the network card to drive cannot connect the net, then how installs the network card to drive? The following small series for everyone to bring Win7 network card driver installation method Introduction, have the need of friends to go to see it. Win7 Network card driver installation method: 　　Method One: Directly with the motherboard drive CD installation. Put the

All the configurations have been completed, and the server under eclipse can run. When the *. War package is output, it cannot run. Jdbcexceptionreporter cannot load JDBC Driver Class ...... Error After checking online, we can see that a similar error is successfully solved. The content is as follows: Standardwrapper. throwableOrg. springframework. JDBC. cannotgetjdbcconnectionexception: cocould not get JDBC connection; Nested exception is Org. apa

Linux driver development-I/O memory access process, driver development-I A device usually provides a set of registers to control the device, read/write devices, and obtain the device status, including the control registers, data registers, and status registers, which may be in the I/O space, it may also be in the memory space. When it is in the I/O space, it is usually called the I/O port. When it is in the

★ General IntroductionLED driver mainly realizes the hardware drive of 4 LED lights on the TQ2440 Development Board, realizes the Pin GPIOB5, GPIOB6, GPIOB7, The high and low level setting of the GPIOB8 (the configuration of the PIN is already implemented in the COMMON-SMDK.C), the driver is called with the test program, and the LED light is illuminated by command.★ Detailed INTRODUCTION 1,

1, the following is the sample code:[CPP]View Plaincopy #include #include #include #include #include Module_license ("Dual BSD/GPL"); static char *version = "2.0.1"; static int My_match (struct device *dev, struct device_driver *driver) { return!strncmp (Dev->kobj.name, Driver->name, strlen (driver->name)); } static void my_