USB urb (USB request block)
Kernel 2.6.29.4The USB device driver code communicates with all USB devices through urb. Urb uses the struct urb structure description (include/Linux/USB. h ).
Urb sends or receives data asynchronously from a specific endpoint of the same USB device. A USB device driver can allocate multiple URBS to one endpoint or reuse a single urb to multiple different endpoints Based on the d
~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
/** * Author:hasen * Reference: Linux device Driver Development Details * Introduction: Android Small rookie Linux * device Driver Development Learning Journey * Topic: device drivers that support polling operations * DATE:2014-11-07 */
In
Globalfifo's poll () function, the r_wait and w_wait wait queue headers in the device structure are first added to the wait list.
Then by judging
How do you complain about the driver on a drip trip?
When the user sends an order, you can see "when the vehicle information does not comply with the proposal to refuse to ride and make complaints," the prompt and remind passengers, once found that the vehicle information does not match, you can refuse to ride, and directly click on the top right corner of the page "more" to complain. When the complaint is verified, the
) Update.set () with filter modification (recommended)
Vi. Inline Array Lookup element operations (LINQ)
(i) LINQ query a record (recommended)
(ii) LINQ query paging (recommended)
Vii. Summary
First, preface本教程是入门基础教程,主要是笔者在项目中使用MongoDB .Net官方驱动对MongoDB内嵌文档的操作时遇到了很多不方便的情况,踩了很多的坑,所以单独整理出来一篇文章,来讲一讲笔者踩坑的过程。The author's level is limited, if has the mistake also please criticize correct!(i) Operating environment. NET version.Net Framwork 4.6.2 x64MongoDB data
Tomcat, unable to find the jar package SQLite, the solution is as follows:Locate the Jdk/jre directory you are using, for example: D:\C\Java\jdk1.6.0_10\jrePut the SQLite driver package, such as Sqlite-jdbc-3.8.7.jar, under the \lib\ext directory, which is below the D:\C\Java\jdk1.6.0_10\jre\lib\ext directoryIf still not, you can copy the driver package org/sqlite/native directory below the
The program error is as follows:---------------------------Microsoft Data Link Error---------------------------The test connection failed because an error occurred while initializing the provider. [Microsoft] [ODBC Driver Manager] in the specified DSN, the architecture between the driver and the application does not match---------------------------Are you sure---------------------------With 32-bit and 64-bi
Tags: javaJava database Connection (JDBC-ODBC mode) Environment: Win7 64-bit and NetBeans IDE 7.1.2 jdk1.7.0_17 (64-bit) Write the program and run the error: java.sql.SQLException: [MICROSOFT][ODBC Driver Manager] in the specified DSN, the architecture between the driver and the application does not match. Note: The Win7 64-bit configuration data source, Control Panel-administrative tool Open Data Source
This chapter is a concrete example of the complete process of developing and testing a Linux driver. Especially test Linux drivers. In this example of counting the number of words, the emphasis is on the implementation of the algorithm: the Linux driver, not how to count. What is the 6.1Linux drive?Linuxthe way the driver works and how it is accessed isLinuxone o
Basic Principles
Through framebuffer, the application uses MMAP to map the video memory to the virtual address space of the application. The data to be displayed can be displayed on the screen after being written to the memory space;
The driver allocates system memory as the memory for display; implements interfaces in the file_operations structure to serve the application; implements interfaces in the fb_ops structure to control and operate the LD
Through the first article, we already know that the whole SPI drive architecture can be divided into three parts: Protocol driver, general interface layer and controller driver. The controller driver is responsible for the data sending and receiving work at the lowest level, in order to complete the data sending and receiving work, the controller
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
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.