hal chatbot

of the virtual file in the read-write/pron directory, proc_dir_ Entry struct represents a virtual directory or file(iv) Commissioning toolsLinux systems provide a class of tools that line up the code of the program, which includes GDB, Gdbserver, and debug kernel space programs for debugging user-space Programs kgdbGDB Debug User space programGDB can track programs that debug user space and can only be tested on a PC2.gdbserver Remote Debugging User space programUse Gdbserver to test programs t

experimentThe PWM drive is similar to the LED driver implementation process and may be simpler. In this chapter it is only to demonstrate how to divide a Linux driver into multiple implementation files before using a relatively simple PWM driver.Summarize:Through the study of this chapter, we can master the common code reuse mode of Linux driver. In addition, this chapter introduces a method of forcibly uninstalling Linux drivers. This way, you can eliminate the pain of restarting the machine.h

file system (/dev). /proc is a virtual file system, which means that/proc is not a real file system, but a memory map.Debugging Tools:Debug the user space program with GDB, remotely debug the user space program with Gdbserver, and debug the kernel program remotely with KGDB.When you find that there are too many bugs in a piece of code, it is difficult to find out through the PRINTK function output information, consider using KGDB to locate the bug in step by step mode.Read "Android Deep Explora

Linux drivers is very important, is to modify the Linux driver source code, should try not to modify the Linux The driver interface. In a complete Linux Drive, mainly consists of internal processing and hardware interaction two parts. If the inter-Linux porting between different versions , the main porting of the first part, on different hardware platforms, then the main second part. Software 1308 class 31st Zhang Fan Blog Park address: http://home.cnblogs.com/u/sxauzzz/Android Deep Explore (

Drivers The first 5 steps above are the next three steps in how to write a Linux driver to make Linux drivers work correctly. 6.3 First Linux Driver: Count the number of words1. first establish The directory where the Linux driver is stored, and then create the source code file. Finally write a makefile file2. writing The skeleton of a Linux driverInstall Linux driver:insmod Word_count.koTo see if word_count is installed successfully : lsmod | grep word_countUninstall Linux driver:rmmod

I. Method of accessing device registers => access through the proc file system, access through the traditional method of device files, and access through the devfs file system. 2. Add Hal layer and JNI method implementationCode, Add helloserver service, write APK TestProgram. Note: 1. After the appfaramworks server is added, modify the framworks file. After make snod is used, the system may stay on the android boot page. You can see from lo

, including process scheduling, timers, etc., are part of the platform-related code in the Arch/*/kernel directory.Lib:Library file code. mm:Memory management code, and part of the platform-related code is placed in the ARCH/*/MM directory.Net:Network-related code, the implementation of a variety of common network protocols.Scripts:The script file used to configure the kernel files.Security:is primarily a selinux module. Sound:Drivers for commonly used audio devices.USR:Implements a cpio.Android

the host with binary image storageerase– Erase specific partitionsreboot– Restart the device for the primary operating system, the system recovers the partition or goes back to its boot loaderdevices– all devices in the display list (with serial numbers) to the hostformat– format session specific partition, partition file system must be recognized by the deviceAndroid NDKLibrary files that can be compiled into arm,mips or x86 source code in c,c++ and other languages as Android Native Developmen

This chapter focuses on the process of building Android's underlying development environment, including the Android application development environment, the ANDROIDNDK development environment, and the cross-compilation environment.1. Required Tools:JDK6 or laterEclipse3.4 or laterADT and CDTAndroid SDK Android NDKCross-compilation environmentLinux Kernel source codeAndroid Source codeSerial tool for debugging the Development Board: minicom2. Steps to install the JDK:JDK, set the PATH environment

This article introduces that many software in Linux is not provided as binary installation package, but rather provides source code directly.Reasons for not providing installation packages: If you provide an installation package, you will need to provide a binary installation package for each version of Linux. Linux has a very large kernel version, so in order to reduce the size of the distribution package, the source code is provided directly for the user to compile and run directly.Git is a so

installation:Download the offline installation package first, then install it Configuring ADT WINDOW>PREFERENCES>ANDROID>SDK location-> Enter the android SDK installation directory, save it Create AVD New in Android Virtual Device ManagerL Install Android NDK development environment Download Android NDK, unzip, generate Ndk-build script file to compile NDK program and add its installation directory to environment variables Install CDT, download the offli

tasks of Android porting are: Porting Linux drivers, porting HAL.To view the kernel version of the method:1.uname–a2.cat/proc/versionLinux divides memory and peripherals into 3 categories: Character devices (devices that are accessed in serial order, such as touch screens, tape drives, mice, keyboards, etc.), block devices (System-fast buffering), network devices (designed to receive and send packets), and do not correspond to file system nodes.The Linux kernel version number consists of a majo

–cC. Verify that the cross-compiler is successfully installed#ls/usr/local/arm–lD. Installing Libncurses5-dev Configuring and compiling the Linux kernel #export Path=/root/cmpilers/arm-none-linux-qnuabi/bin: $PATH#cd ~/linux_kernel#make Clean#makeAndroid porting is primarily the porting of the Linux kernel, and the Linux kernel porting is primarily a Linux-powered migration, so in order to develop and test Linux drivers, two sets of development environments are required under Ubunt

environment configuration, first need to install Android SDK and configuration, then install Eclipse, configure ADT in the installation, and finally build the AVD.You will also need to install the Android NDK development environment to run as an Android operating program, but you will also need to install the Android SDK first. First you need to download the Android NDK, then install the CDT, command line to compile the Android NDK, import the Android Ndk example, and finally configure the Andr

/*/kernel directory.LIB: library file code.MM: Memory management code, and part of the platform-related code is placed in the ARCH/*/MM directory.NET: Network-related code, the realization of a variety of common network protocols.Scripts: The script file used to configure the kernel.5, Android Transplant is mainly the Linux kernel transplant, the Linux kernel transplant is mainly Linux4-Driven porting. So we need to build two sets of environments for Android application development environment a

configure the linux modules in the kernel. config linux driver is hosipital in three ways: compiling the driver module, writing the near-core, and from the linux kernel removal. Fconig: This file is available for each module directory that you want to connect to the Linux kernel. This file is primarily used to define the menu displayed by the Makemenuconfig command, and in addition totheKconfig file, you can import Kconfig in other directories file. Makeconfig: General and kconfig

sending, receiving. The s5pv210 has four UART baud rate divisor buffers. The DMA-210XP has two serial ports: UART0 and UART3. The UART's dedicated registers are: line control, UART control, receive, and transmit status registers. The Linux serial interface also uses open, close, read, write, IOCTL, and so on.ZigBee is a short-distance, high-reliability wireless communication technology. ZigBee interface design: UI upper Layer design, edit program code, Main.java file, serial port data interacti

Location Service (Getsystemservice () method), 2) simulation test, 3) GPS and Google map location. Case Reconstruction: Map display mode: Refactor the "Locate query" locate () method, add a thread to handle the function of the query location, and refactor the "Query method": Refactor the "Query Around" find () method, adding a thread that handles the function of the query location in that thread. The "query around" method is basically the same as the "locate query" method, where you need to imp

to understand the complete development of Linux drivers. This chapter not only introduces an example, but also describes how to test Linux drivers using different methods. These methods are mainly differentiated by platform. For example, you can test Linux drivers directly using Ubuntulinux. There are many drivers that can be installed directly on Android, Linux and other embedded systems once they are compiled again with the appropriate Linux kernel. Of course, you can also test Linux drivers

program7. Test the system.img file with the simulatorThe second part we learn to download and compile the Linux kernel source code1. Download the linux kernel source codedirectory structure of 2.Linux kernel source code3. Install the Android Kernel's build environmentStep one: Prepare for the second step: Unzip the compiler step three: Verify that the Cross compiler is installed successfully fourth step: Install libncurses54. Configuring and compiling the linux kernelThe content of this chapter