nest farsight

the device number, the fourth parameter is the device name, and the fifth parameter is the slave device number. The following uses a simple character device driver to demonstrate how to use these functions: (Extended reading:Driver comparison between Block devices and character Devices)/** Copyright (c) 2005 farsight** This program is free software; you can redistribute it and/or modify* It under the terms of the GNU General Public License as publish

(){Int FD;Char key = 0;FD = open ("/dev/button_scan", o_rdwr); // open the deviceIf (FD =-1){Printf ("open device button errr! \ N ");Return 0;} IOCTL (FD,); // clears the keyboard buffer. The following two parameters are meaningless,While (key! = 16){If (read (FD, Key, 1)> 0) // read the keyboard to obtain the corresponding key value.{Printf ("********************* key value = % d *********** ****************** \ n ", key );}}Close (FD); // close the deviceReturn 0;} // ---------------------

); (3) Reconfigure the kernelRoot @ farsight:/source/kernel/linux-2.6.26.5 # Make menuconfigDevice Drivers ---> graphics support --->Logo configuration --->[*] Bootup logo [*] Standard black and white Linux logo [*] standard 16-colo rlinux logo [*] standard 224-color Linux logo(4) recompile the kernelReplaying Development BoardAt this time, there will be a cute little penguin logo. This indicates that your driver has been successfully transplanted.

Blog: Http://blog.csdn.net/muyang_renThis is compared with the device driver programmed into the kernel.Led.h#ifndef _head_h#define _head_h#define MAGIC ' H ' #define LED_ON _iow (magic,1,int) #define Led_off _iow (magic,0,int) struct led_device{dev_t devno;unsigned int led_major;struct Cdev *led_cdev;struct class *led_class;struct device *led_device;}; #endifPlatform EquipmentDev_led.c#include Platform-drivenLed_drv.c#include Test procedure:#include MakefileIfeq ($ (kernelrelease),) Kerneldir =

Frequently Asked Questions When Using realviewmdk (2)Author: Zhao Ming, a lecturer at Huaqing vision embedded College. Download with realviewmdkProgramHave you ever encountered an error message similar to the following? Load "D: // David // project // farsight // led_uart // OBJ // led_test.axf" No algorithm found for: 30000000 H-300041efh Erase skipped! The error dialog box "error: Flash download failed-ARM920T" is displayed. From the error

/2387040/how-to-retrieve-the-gcc-version-used-to-compile-a-given-elf-executableques: I ' d like to retrieve the GCC version used to compile a given executable. I tried but readelf didn ' t get the information. Any thoughts?ANS: To complete what others has Said:it's not stored in the object (or EXE) file, unless you compile wit H Debugging Information! (option -g ). If you compile with the debug info, you can get the it back with readelf :[email protected] test]# gcc a.c[[email protected] test]#

1. In the command Line Definition Editor commandcommand format sed options script fileSED does not modify the text file's data, he only sends the modified data to stdout.2. Use multiple editor commands on the command linePlace the command in a fileThe 3.S command uses the replacement tagThe number representing the new text will replace the place where the pattern matches the first. g, replace All. P, the original content is printed out. W file, which writes the result of the substitution to the

. It is really lost, but it is also the greatest gospel for new code beginners. The equals method in Java is similar to operater = in C ++, that is, how to compare whether two objects have the same content The clone method in Java is similar to operater = in C ++, but objects in Java are basically referenced semantics and do not have operater = semantics in C ++, therefore, the copy constructor and operater = which are very important in C ++ basically do not exist. In Java, only one object can b

Cardboard Chrome experiments: Contains a number of demo programs, as well as code examples. Myo ArmbandCool gesture arm Ring Myo armband allows the user to wear on the forearm of the arm, can control the computer through the action command, through the movement and the EEG activity detection, Myo armband can identify the user's gesture activity.JavaScript interaction Capabilities Myojs: An unofficial MYO armband Javascript framework. NestThe

/139239/201410/ 141121347942278.png "border=" 0 "/>Cool gesture arm Ring Myo armband allows the user to wear on the forearm of the arm, can control the computer through the action command, through the movement and the EEG activity detection, Myo armband can identify the user's gesture activity.JavaScript interaction Capabilities Myojs: An unofficial MYO armband Javascript framework. Nest650) this.width=650; "Width=" 539 "height=" 543 "title=" image "style=" border-width:0px;padding

ObjectiveThe nest is a node. JS framework that is compatible with typescript and JavaScript. This article uses some of the basic modules of nest to build a simple Web backend curd application. Typeorm is a relatively mature object-relational mapper, written by Typescript. Nest and Typeorm, you can view the official documentation.Project BuildingUsing the CLI to b

I have just installed fedora17 as an essential installation tool. to solve the problem of video format and Chinese input method, I changed ubuntu12.04 to fedora17 today. I like gnome3. In order to stimulate English learning, we chose English. The result is that there is no Chinese input method .... My computer is 64-bit, 32-bit... I have just installed fedora 17 and it is essential to solve the problem of video format and Chinese input method. today I changed ubuntu 12.04 to fedora 17 and liked

: qt-sdk-linux-x86-opensource-2009.04.1.bin Run the preceding file on the terminal. The installation guide dialog box is displayed. Install the file as prompted in the dialog box. (3) Compile and install from source code Download the source code of qt-x11from "ftp://ftp.qt.nokia.com/qt/source/", as shown in Download qt-x11-opensource-src-4.5.3.tar.gz; On the Ubuntu terminal, decompress, configure, compile, and install the tool. The procedure is as follows: (1) decompress the source

. : The third method is to use its own player. Specify action as action_view, data as Uri, and type as its MIME type. Common Methods for vidoeview are as follows: In addition, mediacontroller also provides some useful methods, as shown in the following table: Here is an example. First, we need to define a layout. In this layout, we need a videoview component. The file is as follows:Android: Orientation = "vertical" Android: layout_width = "fill_parent"Android: layout_height = "fill_parent">And

directory. The toolkit used is as follows (the gcc-3.4.5-glibc-2.3.6.dat has instructions, if your Linux environment can access the Internet, the installation script used later will automatically download the required package ):Gcc-3.4.5.tar.gz glibc-2.3.6.tar.gz linux-2.6.14.tar.gz crosstool-0.43.tar.gz Binutils-2.15.tar.gz glibc-linuxthreads-2.3.3.tar.gz linux-libc-headers-2.6.12.0.tar.bz2 gdb-6.5.tar.bz2Copy them to/home/farsight/downloads: (3) de

Memdev.h#ifndef _memdev_h#define _memdev_h#define mem_magic ' m ' #define Mem_restart _io (mem_magic, 0)//Use the kernel-provided macros to generate commands #define MEM _set _iow (mem_magic, 1, int)//change command to pass a shaping parameter to the kernel #endifDriver MEMDEV.C#include Application MEM_READ.C#include The device number is dynamically assigned in the driver and the device number assigned by the system to Memdev is viewed through cat/proc/devices.Use the command Mknod/dev/memde

parent device of the device, if none is specified as NULL, the third parameter is the device number, the fourth parameter is the device name, and the fifth parameter is the device number. Here's a simple character device driver to show you how to use these functions:/** Copyright (C) 2005 Farsight** This program was free software; You can redistribute it and/or modify* It under the terms of the GNU general public License as published by* The free sof

Why the importance of UML modeling If you want to build a dog nest, prepare wood, nails, and some basic tools (such as hammers, saws, and tape ), you can start working. From developing a preliminary plan to completing a dog's nest that meets the appropriate functions, it may be possible to implement it within a few hours without the help of others. As long as the dog's