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Android Deep Explore HAL with driver developmentFourth ChapterDownload and compile the source codeReading notesFirst, download compile and test the Android Source code1. Configure the Android Source code Download EnvironmentCreate a directory to hold the download script file (you can put the file in any directory where you use -/bin)# mkdir ~/bin# Path=~/bin:$PATH2. Download repo script file (for download Android source code)# Curl Htttps://dl-ssl.goo

Android Deep Explore HAL with driver developmentChapter IIIGetting started with GitReading notesGit is the software that manages the source code. First, install Git# apt-get Install git# apt-get Install Git-doc git-emall Git-gui GITKUse the following command to control Git:# Apt-get Install Git-core# apt-get Install Git-doc git-svn git-email Git-gui gitkSecond, view Git documentationTo view the git-checkout command Documentation:# git Help git-checkou

Andorid system. and the HAL source code, so from the Andorid the number of source code, Andorid source is still very complex. Two sets of development environments to build, Linux kernel development environment and Android application development. Ultimately, better understanding of Android porting is primarily about porting the Linux kernel. The best way to learn new technologies is not to read technical books or to view articles written by cattle on

Git is a complex feature that makes your development faster and more manageable, especially with friendly interactions and feedback on open source projects.Familiarity with some of the GIT instructions can help developers avoid being interrupted by external factors or even delaying the project's check date. The submission of the specified code base requires RSA authentication, and the public key is required to determine that the device can submit the management code base.If the source code is th

Android Deep Exploration ( volume 1) HAL with the Driver Development Section three Chapters git Getting started with reading notesThis chapter is an overview of Git. linux is an open-source system. In fact, in linux Many software is related to the underlying program and the kernel driver. , however linux The kernel has a lot of versions, If each version of the software is in the form of an installation package, matching so many versions of the

The 2nd chapter builds the Android development environment2.1 What tools are needed for Android bottom-up developmentWhat tools are needed to develop, test, and debug Linux drivers, HAL libraries:JDK6 or above version;Eclipse3.4 or above version;ADT;CDT;Android SDK;Android NDK;Cross-compiling environment;Linux kernel source code;Android source code;For debugging development boards and serial tools: Minicom.2.2 Installing the JDKConfigure them directly

1.1 Android has a very complete system architecture that can be divided into four layers:First layer: Linux kernel. Includes drivers and programs that manage memory, process, power, and other resourcesThe second layer: C + + code base. Mainly includes the Linux. So file and the NDK code embedded in the APK programLayer Three: Android SDK API Direct application-oriented Java APKLayer Fourth: Application. Java applications that target end users directly1.2 The main work of Android system portingAn

Android Deep Explore ( vol. 1) HAL with Driver Development Learning notes (6)Sixth. The first Linux driver counts the number of words the Linux system maps each driver into a single file. These files are called device files or drive files and are saved in the/ dev directory. This design concept makes interacting with Linux drivers as easy as interacting with ordinary files. Although there is no concept of events in C, there are concepts similar to eve

For complex Linux drivers and libraries such as HAL, you need to test them in a variety of ways. such as setting breakpoints, gradually tracking code, output debugging information and so on. This chapter focuses on how to debug embedded Linux kernel modules, executable programs, and shared libraries using the Development Board, Android emulator, and some functions and tools.1. Print kernel debug information: PRINTKThe function is similar to the printf

Android is an open system rather than an open source system.Aside from these arguments, learning about the Android hardware abstraction layer is extremely useful for understanding the entire Android system, as it involves the hardware drive layer of the Android system, the hardware abstraction layer, the runtime library, the application framework layer, and so on. The following diagram illustrates the location of the hardware abstraction layer in the Android system and its relationship to other

The 10th chapter: the Debugging technology of embedded LinuxFor complex Linux drivers and libraries such as HAL, you need to debug them using a variety of methods. For example, setting breakpoints, stepping through code, outputting debugging information, and so on.First, print kernel debug information: PRINTKThe PRINTK function has been used many times in the previous chapters. The function is similar to the printf function, except that the PRINTK fun

By learning Android Deep Exploration (Volume one) HAL and Driver Development eighth chapter Let me know how to make the Development Board sound, how to write a buzzer driver. Understand the code reuse of Linux drive, code reuse is divided into static and dynamic two kinds.Linux-driven code reuse there are many ways, you can use the standard C program, the code of the important code in other files, if you want to use some features, include the correspo

By learning Android Deep Exploration (Volume one) HAL and Driver Development chapter Tenth let me know the debugging technology and debugging tools for embedded Linux.PRINTK can print kernel debugging information, the function is similar to the printf function, except that the PRINTK function runs in kernel space, and the printf function runs in user space. The PRINTK file is a simple four-digit text file with a default value of: 6: Output The message

Why does the error message "windowsroot \ system32 \ hal. dll" appear corrupted or lost when fadora8 is installed? -- Linux general technology-Linux technology and application information. For details, refer to the following section. For example, during installation, the boot is modified. INI file, added a sentence C: \ grld = "grub start". After restarting, the system prompts whether to go to windows or grub and select grub. After searching on the in

[Turn] Android Hal layer GPS research summary 2011-09-22 A fast run may not win, a competitive battle may not win, a smart one may not win food, or a wise one may not win money, or a flexible one may not be excited. What came to the world was the opportunity. In my life, if the twilight grass. /Eclair/hardware/libhardware_legacy/include/hardware_legacy/GPS. h Typedef struct {? ? /** Contains gpslocationflags bits .*/? ? Uint16_t? ? ? ? Flags;? ? /**

accelerometer ","Kionix ",1, sensors_acceleration_handle,Sensor_type_accelerometer, (gravity_earth * 4.0f ),(Gravity_earth)/1024366f, 0.145f, 10000 ,{}},// Added by YUE 20130319 // added later# If 0{"Ak8975 orientation sensor ","Asahi kasei Microdevices ",1, sensors_orientation_handle,Sensor_type_orientation, 360.0f,Convert_o, 0.495f, 10000 ,{}},# Endif# Endif.....} [Summary]The root cause of this is the typical case where removing msensor code from the sensor

In the last two articles, we introduced how to write drivers for Android hardware, including how to implement kernel drivers in Linux kernel space and Hardware Abstraction Layer interfaces in user space. The purpose of both is to provide a hardware access interface to the previous layer, that is, to provide hardware services for the Android Application Frameworks layer. We know that android applications are written in Java and hardware drivers are implemented in C. How can we access the C interf

. Porting Linux Drivers is a very important one. is to modify the Linux driver source code, you should try not to modify the Linux driver interface. This chapter focuses on LED drivers, a Linux driver that really deals with hardware. Although the LED driver is not complicated, it only controls a few LEDs, but the LED driver already includes all the necessary parts of the Linux drive. A complete Linux driver consists of two parts: internal processing and hardware interaction. The internal process

value for console log level.Prevent PRINTK functions from reducing Linux drive performanceThe PRINTK function displays messages in the console through the/dev/console device file. The device file only works under the console of the character interface, so the PRINTK function is only used on the console of the character interface to output messages normally.If you do not want to use the PRINTK output message, simply change the 1 in #if1 to 0.Data interaction through a virtual file system (/PROC)

character device array in the kernel;(4) Create struct classwith class_creat macro;(5) Create a device file using the device_create function;2.uninstalling the Led driver's device files3. Set register and initialize led driver4, control led lights:(1) control LED via string (2) control via I/o command5 . Module parameters of LED driver6. Test LED driver(1) A general program for writing test I/O control commands;(2) using NDK to test LED driver;(3) using Java test LED driver;7,Led Drive transp