arm techcon

, the power that needs to be multiplied or divided by 2 can be done by moving left or right n bits. In fact, multiplication can be replaced by any integer by shift and addition. The method of adding and shifting in ARM 7 can be completed by one command, and the execution time is less than the multiplication command. For example, I = I × 5 can be replaced by I = (I Multiplication is used to replace multiplication: A 32 × 8 Multiplier is built in the

Transferred from CNBETA, original address: http://www.cnbeta.com/articles/167883.htmarmand x86are not comparable. The performance gap may be several thousand times higher. Here we will not care about the details. Let's just talk about why ARM and X86 are not comparable. To clarify this question, first of all, we need to understand what architecture is. Many people have mentioned that the architecture is different, but what does the architecture mean?

Part 1 arm assembly syntax in Linux Although it is convenient to use C or C ++ to write programs in Linux, the assembler source program is used for the most basic initialization of the system, such as initializing the stack pointer, setting the page table, and operating the arm coprocessor. After initialization, you can jump to C code execution. Note that the GNU assembler follows att's Assembly syntax and

Document directory PHP version 4.4.8 PHP and sqlite3 After several days of efforts, we finally built the Apache + SQLite + PHP platform on the arm-Linux platform. Apche and SQLite have a lot of information on the Internet, but PHP for ARM-Linux is rare. it took a lot of time to install PHP on the ARM platform. so I will post the building process here, hopin

Article Title: create a cross-compiling environment for arm-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. Cross-compilation environment Cross-compilation is an important technology in the embedded development process. Its main feature is that the program code executed on a machine is not compiled and gener

Reprint Please specify source: http://blog.csdn.net/mybelief321/article/details/9076583Installation EnvironmentLinux version: Ubuntu 12.04 kernel version: Linux 3.5.0 cross compiler version: arm-linux-gcc-4.4.3 This version of the cross-compiler I have uploaded to the resources, can download freely, click here to downloadPre-Installation rambleFirst, a simple introduction, the so-called cross-compilation environment, that is, the installation, configu

This article reprinted from: Ubuntu 12.04 Embedded Cross-compilation environment ARM-LINUX-GCC construction process diagramPre-Installation rambleFirst, a simple introduction, the so-called cross-compilation environment, that is, the installation, configuration cross-compilation tool chain. In this environment, the embedded Linux system needs to compile the operating system, applications, etc., and then uploaded to the target machine.The cross-compila

Learning In Arm assembly language , it is necessary to debug Arm assembly instructions. As a debugger that supports multiple languages,gdb is naturally a better choice. When the debugger works, it usually constructs the trap soft interrupt instruction by modifying the content of the code snippet , realizes the program's pause and the program execution state monitoring. In order to execute

The first part is the arm assembly syntax in Linux. Although it is very convenient to use C or C ++ to write programs in Linux, the Assembly source program is used for the most basic initialization of the system, such as initializing the stack pointer, setting the page table, and operating the arm coprocessor. After initialization, you can jump to C code execution. Note that the GNU assembler follows att's

Refer:Http://www.arm9home.net/read.php? Tid-5161.htmlHttp://www.arm9home.net/read.php? Tid-5182.html Http://blog.sina.com.cn/s/blog_6541e78f0100ihoy.html? Retcode = 0 Http://blog.sina.com.cn/s/blog_6541e78f0100ihp3.html? Retcode = 0 Http://hi.baidu.com/jiyeqian/blog/item/f46d26a2ff3f7da6caefd0d6.html Http://hi.baidu.com/clear water flow /blog/item/9b9ac64bb8b4aaf383025ce0.html Http://blog.ednchina.com/gurongjiang/352778/Message.aspx (1) install the corresponding library files before compiling Q

Opencv is an open-source computer vision Library Supported by Intel. It consists of a series of C functions and a small number of C ++ classes, implementing many common algorithms for image processing and computer vision. It does not rely on other external libraries-although some external libraries can also be used. Opencv uses BSD license, which is free for non-commercial and commercial applications. The main application environments of opencv are Windows and Linux. For embedded systems such

/downloads/qt-creator-binary-for-linux-x11-32-bit) for Linux/X11 32-bit) Qt 4.6.2packet qt-everywhere-opensource-src-4.6.2.tar.gz (http://qt.nokia.com/downloads/embedded-linux-cpp) for Embedded Linux) To arm-linux-gcc-4.1.2 (that is, http://qtextended.org/downloads/toolchains/arm920t-eabi.tgz) Download root_qtopia. I use the root_qtopia-20100108.tar.gz file in the youshanguang disk, and download tslib1.4 and tslib1.4 to FTP Server 1 of the Linux commu

ARM Assembly command debugging methodWhen learning ARM assembly, you must debug ARM Assembly commands. As a multi-language debugger, gdb is naturally a good choice. When the debugger is working, it generally constructs the trap Soft Interrupt command by modifying the content of the Code segment to monitor the program pause and program execution status. To execute

Arm-linux-ld command-T option is an important option in the ld command. It can be used to directly specify the code segment, data segment, doctoral student, www.2cto.com segment. For complex connections, you can write a script specifically to tell the compiler how to connect. -Ttext addr-Tdata addr-Tbss addr arm-elf-ld-Ttext 0x00000000-g led_On.o-o led_on_elf, the running address is 0x00000000, because ther

Directory0 Preface1 Installing arm-linux-gcc-4.3.22 Configuring Server for NFS 0 PrefacePreviously, cross-compiling was established on Fedora 64bit, but since the 4.4.3 version required another GDB tool for Gdb-server debugging, and it took a long time, multiple GDB versions were error-filled. or a 32bit system.The arm-linux-gcc4.4.2 of the friendly arm has

ARM Linux boot sequenceThe following traces the Linux boot sequence for ARM-based systems in the 2.6.18 kernel. it looks at just the earliest stages of the boot process, until the generic non-processor-specific start_kernel function is called. the line numbers of each statement are in parenthese at the end of the line; the kernel source itself can be conveniently browsed on the Linux cross-reference website