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Compile the JNI method for the hardware abstraction layer (HAL) module of Android in Ubuntu to provide the Java access hardware service interface (Lao Luo study note 4), androidjni 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 p

Embedded Linux debugging technology, for the complex Linux driver and Hal and other libraries, need to use a variety of methods for debugging, such as setting breakpoints, gradually tracking code, output debugging information. This chapter focuses on how to debug embedded Linux kernel modules, executables, and shared libraries using the Development Board, Android emulator, and some functions and tools.The use of the PRINTK function is similar to the p

This chapter mainly studies The call technology of Embedded Linux, which needs to be tested by various methods for complex Linux drivers and HAL libraries. Here are two things to know when writing a macro:1. Variable-parameter macros2.do{...} while (0)After that, we learned the parameter definitions of 4 functions:Proc-makedirName: virtual directory namesParent: proc-dir-entry struct pointer for the parent directory of the virtual directoryCreat-pro

Android Deep Explore HAL with driver developmentChapter IIBuild an Android Development EnvironmentReading notesA. the tools needed for Android bottom-up development1, JDK6 or above version2, Eclipse3.4 or above version3. ADT(for Android applications)4. CDT(used to develop Android NDK program)5. Android SDK6. Android NDK7. Cross-compilation environment8. Linux Kernel source code9. Android Source Code10. Serial Tool for debugging Development Board:minic

Android Deep Exploration ( volume 1) HAL with Drive Development Chapter I Android system porting and driving development Overview reading notesThis chapter isAndroidsystem porting and Driver development Overview of the specific explanation. First,Androidis divided into four layers of architecture. At the bottom of it isLinuxkernel. And then, respectively,C + +code Base,Android SDK Aand applications. andAndroidtransplantation is also divided into syste

Android Deep Exploration ( volume 1) HAL and drive development Chapter II Build the Android development environment reading notesThis chapter focuses on setting up an Android development environment under Ubuntu Linux.1, JDK: Download the compressed package from the official website, and unzip it.Gedit Etc/profile and set the PATH environment variable, remember path.2, build the Android application development environment.Installing the Android SDKIns

1th. Android system porting and driving development Overview1.1 Android System ArchitectureAndroid is a very good embedded operating system. After several years of development and evolution, Android has evolved to form a very well-developed forest system architecture.Android's system architecture is divided into 4 tiers: The Linux kernel, the C + + code base, the Android SDK API, the application.1.2 The main work of Android system portingAndroid system porting can be divided into two parts: appl

By learning Android Deep Exploration (Volume one) HAL and driver development in the seventh chapter let me know how to control the light emitting diode through the driver, realize the driver directly interacts with the hardware.A complete Linux driver mainly consists of internal processing and hardware interaction, in which the internal processing mainly refers to the Linux driver loading, unloading, device file-related action processing and business

future compilation process)3. Move the directory 4.2.2-eabi/below the/usr/local/arm/4. Set Environment variables:Edit the/etc/profile file, add: Path= "$PATH:/usr/local/arm/4.2.2-eabi/usr/bin" At the end of the fileExport PATHTo make an environment variable effective: In Terminal input command: source/etc/profileTest environment variable is set successfully: in Terminal input: Echo $PATHIf the output path contains/usr/local/arm/4.2.2-eabi/usr/bin, the environment variable setting is successful5

Android Deep Explore ( vol. 1) HAL with Driver Development Learning notes (7)The seventh chapter controls the light emitting diode LED Driver Implementation principle 2. writing LED Drivers* Create LED -driven device files• Initialize cdev with the cdev_init function• Specify the device number• Use the cdev_add function to add a character device to a character device group in the kernel•

Article reprinted to CSDN community Luo Shenyang's Android tour, original address: http://blog.csdn.net/luoshengyang/article/details/6573809In the Android Hardware Abstraction Layer (HAL) Overview and Learning Plan article, we briefly describe the ways in which Android systems write drivers for hardware. In short, hardware drivers are distributed on the Linux kernel, and on the other hand, in the hardware abstraction layer of user space. Next, writing

In Class I studied Android Deep Exploration (Volume one) of this book. The first section of the textbook details how to build and use the Ubuntn Linux12.04 LTS, Android Simulator and s3c6410 Development Board.First of all, I learned that Android is a very good embedded operating system. Android's system architecture is divided into four tiers: the Linux kernel, the C + + code base, the Android SDK API, and the application.Second, it is the porting of the Android system. Android migration is divi

it has been referenced once. Scenario Two: The Unload function is blocked rmmod command uninstall linux when driven, the system calls the Unload function (ran over module_exit macro specified function), only the Unload function successfully returns to the elbow, linux rmmod The command will also be blocked. That is, never execute to uninstall linux rmmod In either case, an unavoidable problem is to get the module struct pointer that represents the Linux driver module to unlo

required by the abstraction layer. [1]?Characteristics* Hardware abstraction layer has close correlation with hardware* Hardware abstraction layer with OS agnostic* The features defined by the interface should contain all the features required by hardware or system hardware support* Interface definition is straightforward, too many interface functions add complexity to software simulations* Measurable interface design facilitates system hardware and software testing and integrationWorking modeT

at the moment, I think the biggest convenience of Stm32cube is that you can use STM32CUBEMX software to graphically configure peripherals. First posted on the official website of the PDF,Getting started with the STM32CUBEF4 firmware package for STM32F4 Series "UM1730 User Manual".From the document of a picture, clear introduction of the cube firmware level, I think for our efficient and rapid development, the temptation is quite big, but the introduction of the official website and online resour

Because the optimization system has disabled some services, the rhel6 system cannot be used with the mouse or keyboard in the graphic interface, and a prompt is displayed.Starting Hal daemon: [failed] Haldaemon: After receiving messages passed by udev via D-BUS, call fstab-sync to modify the fstab document and dynamically create subdirectories under the/media directory as Mount Points After troubleshooting, it is found that messagebus is not enabled

Android deep exploration and HAL-driven development (Volume 1)-Chapter 7, android-driven developmentRelationship between applications, libraries, kernels, and drivers From top to bottom, a software system can be divided into applications, libraries, operating systems (kernels), and drivers. Developers can focus on what they are familiar with. For adjacent layers, they only need to understand their interfaces, without paying attention to its implementa

Android deep exploration and HAL-driven development (Volume 1)-Chapter 8: android-driven developmentBuzzer type and working principle The buzzer also becomes PWM (Pulse Width Modulation). The basic principle is to control the opening and stopping of the buzzer through the pulse. It is a very effective technology that uses the digital output of a microcontroller to control analog circuits. It is widely used in many fields such as measurement, communic

, dynamic reuse is a module dependency, and one driver uses symbols derived from another driver module.Restart the Development Board or emulator. ko files will automatically disappear. Use exception Condition Uninstall: 1. Initialize function unload. 2. The Unload function is blockedTo unload a driver, you need to enter a bunch of commands to query the first address of the module struct, install and download the Force_kill_driver driver.The driving principle of the buzzer is basically the same a

debug user space. Quit is used to exit the GDB debugging interface; list is used to list the code in the program. Remote debugging of the user space program with Gdbserver is a service-side program that can run on an arm architecture. First enter the Android emulator terminal and then enter the Data/local directory. The Android emulator can only use the Gdbserver debugger through port mapping.Using KGDB to debug kernel programs remotely, KGDB provides a log output function similar to Prink func