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Write a Linux driver1. Build Linux driver skeletonLinux kernel requires load and unload drivers when using driversLoad driver: Set up device file, allocate memory address space, etc. module_init function processing driver initializationUninstall drive: Delete device files, free memory address space, etc. module_exit function processing exitA C program file containing the two macros of these two functions can also be seen as a Linux-powered skeleton2.

1. Add the Hello directory under the drives directory, containing hello.c kconfig MakefileHELLO.C content:#include #include Module_license ("Dual BSD/GPL"); static int hello_init (void){PRINTK (Kern_alert "Hello, world\n");return 0;}static void Hello_exit (void){ PRINTK (Kern_alert "Goodbye, cruel world\n");} Module_init (Hello_init);Module_exit (Hello_exit); Kconfig content:Config HELLOTriState "Hello Driver added by Dong"Default nHelpTest for adding driver to Menuconfig. Makefile content:obj-$

1. Overview I have read Linux Device Drivers 3 (photocopy) (ldd3 for short) and I have forgotten about it. So I want to take a note of what I have read before, and focus on the comments and understanding of the Code. I am also a beginner in Linux kernel, so I will introduce every detail in the learning-driven process step by step. It is hoped that these blogs will help others, like me, find new entry in the Linux driver and kernel learning field while

do, I have to pay 380 yuan a day, and the fuel fee is about 210 yuan. 17 hours a day, the average fixed cost of 22 yuan per hour, handed over to the company, an average of 12.5 yuan per hour oil fee. Is this 34.5 Yuan ?", I was surprised. I took a taxi for 10 years and heard a taxi driver calculate the cost for the first time. The previous drivers told me that the cost per kilometer is 0.3 yuan, and the amount of money paid every day is similar. "The

existing devices will be registered, but there are also special circumstances. For example, the kernel may need to work with an external network adapter that is not on the board, or controllers that are not attached to any bus.In general, the firmware Startup Process outputs a table of all devices on the board. If this table is not available, the only way to establish the correct device using the system startup code is to compile a kernel for a specific board. This board-specific kernel is wide

-hour drive at a cost of 34.5 yuan per hour ......" "How to calculate it ?" I asked. "You do, I have to pay 380 yuan a day, and the fuel fee is about 210 yuan. 17 hours a day, the average fixed cost of 22 yuan per hour, handed over to the company, an average of 12.5 yuan per hour oil fee. Is this 34.5 Yuan ?", I was surprised. I took a taxi for 10 years and heard a taxi driver calculate the cost for the first time. The previous drivers told me tha

In the Linux kernel, The framebuffer (POST buffer) driver is the display driver standard. framebuffer abstracts the display device as the POST buffer. After the user maps the memory to the process address space, you can directly perform read/write operations, and write operations can be immediately displayed on the screen. Related display drivers and interfaces are available in Linux kernel/Linux/Drivers/Vi

Recently read a lot of kernel programming and drive development tutorials, also refer to some of the Development Board examples. The conclusion is not as high as you can imagine. Developing a driver requires a certain understanding of the kernel, not a thorough interpretation. The drivers referred to below are for specific devices and are made to work in dynamic loading of modules. The driver framework is layered, some

Taxi drivers give me an MBA From http://blog.csdn.net/psyl/archive/2006/03/17/627496.aspx I was about to rush to the airport from Xujiahui, so I ended a meeting in a hurry and searched for a taxi in front of the mercury building. A mass found me and was very professional and straight forward to me. This stops, so I am deeply shocked by the story that follows, like a vivid MBA Case Study. To be loyal to the original intention of the taxi driver, I trie

itinerary of the for example, 4/18 to 4/25 this week to reach the" generation of the guru "group conditions require 1400 yuan of basic fares. Master Wang's fare is 1500 yuan, his "set the destination" to receive a single fare of 300, the actual group reference fare is 1500-300 = 1200 yuan, did not reach the "generation guru" group standard. Rookie group check-in reward to do two a week to join rookie group. Rookie group in the first week can be 10 yuan to sign in to encourage. This week, the r

An MBA for taxi drivers One day, I rushed to the airport from Xujiahui and searched for a taxi in front of the mercury building. A "public" found me and ended up in front of me very professionally and directly. This pause gave me a story that shocked me deeply, like a vivid MBA Case Study."Where to go ...... Okay, airport. I like to do the business of the Miluo building in Xujiahui. Here I only do two places: the Miluo building and the Junyao building

Linux is a variant of the UNIX operating system, and the principle and idea of writing a driver in Linux is similar to that of other Unix systems, but it is very different for drivers in DOS or window environments. Design the driver in the Linux environment, the thought is concise, the operation is convenient, the function is also very formidable, but the support function is few, can only depend on the function in the kernel, some commonly used operat

One key to developing the Microsoft Hyper-V platform is to increase the performance of virtual machines by interacting with hardware. However, many system administrators are frustrated by the performance levels directly carried by Hyper-V. In fact, these performance ultimately involves understanding the I/O stack of the Virtual Machine and how it interacts with the Hyper-V hypervisor. The management program provides a fully integrated driver, called the synthesis driver, which includes 80% of th

. Specifically: Fill in a fbinfo Structure Use reigster_framebuffer (fbinfo *) to register the fbinfo structure to the kernel For the fbinfo structure, the most important thing is its fs_ops member. You need to implement interfaces in fs_ops for specific devices. Whether to use interrupt handling Memory Access If the video card does not have its own video memory, the system memory is allocated as the video memory. The graphics card comes with a vide

Http://www.driverdevelop.com/ Subtitle: Author: Yang Jun Article Source: site original hits:10975 updated on: Editor's note: The content of this article is mainly translated by DriverStudio's random documents. We recommend that you use the following software: DriverStudio2.5, Visual Studio6.0, and Windows 2000 DDK. This document assumes that you have installed these software. DriverStudio2.5 can be downloaded to the test version from the driver deve

unknown device and right-click access properties.In the Properties window, click the Details tab and select a device instance id from the drop-down list. A letter or digit string, similarPCI/ven_1217 dev_7130 subsys_012f1025 rev_01/4 6b16d5b 0 33f0 is the identification mark of the device. We only need to extract vendor ID (prefix is VEN) and DeviceID (prefix: Dev ). In this example, the supplier ID is 1217 and the device ID is 7130. Using the identified numbers, you can use some resourc

version When the device driver needs to support different kernel versions at the same time, in the compilation phase, the kernel module needs to know the version of the currently used kernel source code to use the corresponding kernel API. In the 2.4 and 2.6 kernels, the source code header file Linux/version. H is defined as follows: Linux_version_code: the binary representation of the kernel version. Each of the primary, slave, and revision versions corresponds to one byte; Kernel_version (Maj

Address: http://blog.csdn.net/gaoling179/article/details/6284770 In the process of developing a DSP using Visual DSP ++, you can quickly develop applications by applying the device drivers and system service programs that come with the system software without writing the underlying drivers. (1) Adi has constructed all the drivers and services related to DSP Chi

the Linux structure for continued use.Overall analysis-ReconstructionIf your project does not have a tight schedule, and you can use the portability code repeatedly for future projects, you will analyze the current RTOS application structure based on the time, and how to map them to the Linux structure. For RTOS application code, you need to consider ing RTOS tasks one by one to the viability of Linux Process-based threads, and whether to re-allocate RTOS applications to multiple Linux processe

In this Linux-driven development, a network approach is introduced to introduce two ways to drive development:I. Driver compilation to the kernel1. First select a location to place the driver code, for example: DRIVERS/CHAR/XXX.C2. Add the following to the Drivers/char/kconfig file:Menu "XXX Support"Config xxxTriState "XXX Support"---help---XXX use GPIO as IR input.If you want XXX support, you should say Y