Introduction of character device driver The app uses open, read, write, and other functions to operate the underlying hardware. The driver also has corresponding functions such as Xxx_open. How to find a driver in a function depends on the driver framework.II. Building a Driver
This digest from my my book fixing "embedded Linux driver template explaining and project practice"Initially it seems that Linux device driver development involves a lot of content, and the devices that need to be driven vary widely. Actually doing a time-driven look back looks mostly like the following points:(1) classify the drive. Which type of drive to generalize first. Collation properly re-use the ker
The computer installs the new system to install the drive is the essential process, although the system can automatically identify solves some driver installment problem, but wants to completely solve the drive problem or needs to install each kind of corresponding drive, now the driver software Ling Lang everywhere lets the person not know chooses which section is good. Small series is commonly used to dri
Knowledge Point Analysis:
User no host number, Web page also monitor the user's machine host number, only with the Driver wizard and Driver Life Update sound card driver is not successful, prompted:
Operation Steps:
The main reason is that the Windows XP system has completed its own sound card driver installa
1, download the Driver Wizard, and then install, installation completed, open the Drive Wizard.
2, into the Driver wizard interface, click on the "Driver" above, into the "Driver" interface.
3, in the "Driver" interface, we click on the "Standard mode" of thi
~IOCTL Method
Overview
Objective: To implement various types of hardware control through the device driver
User space call prototype: int IOCTL (int fd, unsigned long cmd ,...);
FD refers to the file descriptor.
"... "Represents an optional parameter, use "... "You can disable the logic check during compilation.
Used to use char * argp;
Optional parameters can be null, integer, or pointer. When a pointer is used, an
My blog: http://blog.csdn.net/muyang_ren
Function: The Development Board dynamically loads the LED driver module and passes the test program.
System: Ubuntu 14.04
Driver cross-compilation kernel: linux-2.6.32.2 // build cross-Compilation
Development Board: mini2440 (128 M nandflash) // for how to download Linux to the Development Board, click. For Linux rootfs, select rootfs_rtm_2440.img (Disk Directory: i
Today, we will go to Chapter 6 advanced character driver operations in Linux Device Drivers (version 3rd.
I. IOCTL
In addition to reading and writing capabilities, most devices can perform operations beyond simple data transmission. Therefore, device drivers must also be able to perform various hardware control operations. these operations are often supported by the ioctl method, which has a prototype different from the user space version:
int (*ioc
NVIDIA has released Nvidia Driver 334.21, a graphics card Driver for Linux users. This new Driver supports GeForce GTX 750 Ti, GeForce GTX 750, GeForce GTX 745, and GeForce gtx titan. In addition, NVIDIA 334.21 has brought a lot of bug fixes. View the release log for details.
Note: It is risky to install the video card dri
Summary previous we analyzed a virtual hardware network driver sample. From here we see some of the interfaces of the network devices. In fact, the function of network device driver and block device driver is similar, both sending and receiving packets (data request).Of course they are actually very different.1. IntroductionFirst, the block device has a device no
One, what does the main device number and the secondary device number mean? Linu kernel is if the main device number to find the driver, the secondary device number to find the device.A: Usually a main device number represents a driver, for example, in a block device, a master device number represents a EMMC device, the different secondary device number represents a different partitionThe Linux kernel allow
Article title: describes the driver framework and driver loading in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
This section describes the Linux device driver framework, driver
.
B)You can either directly send a keyboard, mouse, or other message to the game process by determining that obstacles, monsters, and other things on the map have crossed the map. Of course, killing monsters is done by simulating buttons.
However, with the destructive impact of plug-ins on the game, anti-plug-ins and plug-ins have been entangled in the kernel layer, such:
1,To prevent external callsWindowsA series of key systemsAPI(For exampleOpenProcess,Read/writevirtualmemoryAnd so on)
The wince application was started two years ago. However, due to division of labor, there has never been a chance to gain a deep understanding of the development of the wince Driver (including Pb-related system customization ). If it weren't for the fakegps development work that was scheduled by Ma Ning some time ago, I really don't know when to understand the wince driver development.
Fakegps is a disguise
In the previous article, we introduced the framework of the character device driver. In this article, we will operate on the real hardware-led.
Author: canghai hunter Source: http://blog.csdn.net/embedded_hunter reproduced please indicate the source of embedded technology exchange QQ group: 179012822
I. experiment environment
Development machine environment
Operating System: Ubuntu 9.10
Cross-compiling environment: Arm-Linux-GCC 4.2.2, installation l
MongoDB samus Driver (2), mongodbsamus driver
The driver connection method mentioned in the previous article. This article provides the complete link code and instance
Complete database link
1 static IMongo _ mongo = null; 2 public writable drive () // This class integrates the IDisposable Interface 3 {4 if (_ mongo = null) 5 {6 var connectionString = new mongoon
Update the NIC Driver and fix the blue screen netr28x. sys Driver file error when the win7 Ralink RT3290 Nic is sleeping on the computer and when the NIC is started.
Update the NIC Driver and fix the blue screen netr28x. sys driver error when the win7 Ralink RT3290 Nic is sleeping on the computer and when the NIC is
Linux Device Driver Article 4: Driver debugging methods, linux Article 4
In the previous article, we probably talked about how to write a simple character device driver. We are not a god, but there will certainly be a problem when writing code. We need to continuously debug it during the code writing process. In common c applications, we often use printf to outpu
Continue to drive learning based on the progress of the previous article .......
Main references: http://blog.csdn.net/dg1683wen/article/details/6861044
First, build the kernel source code tree. I am using the friendly arm comes with Linux source code: linux-2.6.35.7-20120912.tgz
First copy the kernel source code linux-2.6.35.7-20120912.tgz to the Ubuntu system directory/home/liuhui8989/linuxshare
Unzip: Tar zxvf linux-2.6.35.7-20120912.tgz to get the linux-2.6.35.7 folder.
Start to build the so
If the system needs to be re-installed in case of a computer failure, if the random drive disk is lost, such as the motherboard driver, NIC driver, and graphics card driver.
In particular, some old machines, motherboard integrated Nic, graphics card. Even if Win2000/WINXP is installed, some devices cannot be automatically driven.
In this case, we can consider u
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