deep linking android

Linux drivers using Eclipse(1): Build C Project(2): Establish C Source code file link(3): Set include path(4): Compiling Linux DriversAfter installing the CDT plug-in, Eclipse can either develop Java programs or develop common C + + programs. Statistics of the number of wordsWord_countThe drive is the first complete bookLinuxDrive. AlthoughWord_countthe drive's functionality is not complex, but it's enough to make it ever contactLinuxdriver-driven developers understandLinuxthe complete develop

OST (native) C program on Android simulatorUsing the Android NDK testDirectly manipulate device file testing using Java codeTest with the s3c6410 Development BoardCompiling the driver into the Linux kernel for testingDevelop and test Linux drivers with eclipse1. Building C Project2. Establish C source code file connection3. Setting the Include path4. Compiling Linux DriversTesting Linux drivers in eclipse1

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By learning Android Deep Exploration (Volume one) HAL and Driver Development Chapter Sixth let me understand the complete process of developing and testing Linux drivers for counting the number of words.The Linux system maps each driver into a single file, which is called a device file or driver file, and is stored in the/dev directory. Since most Linux drivers have their corresponding device files, exchang

a complete Linux driver consists mainly of internal processing and interaction with hardware. The internal processing mainly refers to the Linux driver loading, unloading, and device file-related action processing (read and write device files, send I/O commands to the device file), as well as business logic. The interaction with hardware is mainly through the functions of iowrite32, IOREAD32, etc., and the registers in the hardware. In the experiment of controlling led flicker of LEDs, the reali

the secondary device number. File_operation structure weight defines the callback function pointer variable. If the device file Misc_register is successfully registered, the return value is a non-0 integer, or 0 if it fails.When writing code, it is important to note that because kernel-space programs do not have direct access to user-space data, you need to use Copy_to_user and copy_from_ separately in the Word_count_read and Word_count_write functions. The user function copies data from the ke

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 wa

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 w

Start Android 1, linearlayout layout of the nesting 2, Layout_weight Property The value of this property is used to specify the allocation scale of free space ; Match_parent Matching parent control wrap_content matching content This chapter, although deep-linearlayout layout, is the key point of nesting A pair set the orientation of each level linearlayout layout (landscape or portrait) and then put th

Android audio and video goes deep into 21 FFmpeg video cutting, androidffmpeg Video cutting I accidentally found that the code of the last video compression can run the FFmpeg video cutting command, but it cannot be used to merge videos, because you cannot read txt files that record the paths of several videos. Here I will talk about the video cutting process, not the code, but the log. After all, I don't k

Android audio and video goes deep into 18 FFmpeg to play videos with sound (source code download) and androidffmpeg Project addressHttps://github.com/979451341/AudioVideoStudyCodeTwo/tree/master/FFmpegv%E6%92%AD%E6%94%BE%E8%A7%86%E9%A2%91%E6%9C%89%E5%A3%B0%E9%9F%B3%EF%BC%8C%E6%9A%82%E5%81%9C%EF%BC%8C%E9%87%8A%E6%94%BE%E3%80%81%E5%BF% AB %E8%BF%9B%E3%80%81%E9%80%80%E5%90%8EThis project was written by the sim

Android audio and video goes deep into the 16 FFmpeg streaming mobile phone camera to achieve live broadcast (with source code download), androidffmpeg Source Code addressHttps://github.com/979451341/RtmpCamera/tree/masterAfter configuring the RMTP server, paste it here.1. Configure the RTMP Server I don't want to post two blogs on mac and windows respectively.Set up an RTMP server on MACHttps://www.jianshu

Android audio and video goes deep into FFmpeg to implement Rtmp-based streaming (with source code download) and ffmpegrtmp Source Code addressHttps://github.com/979451341/Rtmp1. Configure the RTMP Server I don't want to post two blogs on mac and windows respectively. Set up an RTMP server on MACHttps://www.jianshu.com/p/6fcec3b9d644This is on windows, and the RTMP server is set up (crtmpserver and nginx) H

modulation), the basic principle is to control the buzzer by pulse to open and stop. Implement buzzer driver Test buzzer driverThe PWM driver is similar to the principle of the LED driver, as long as an experiment is made, and the other one will understand. But the code needs to be carefully written to understand the steps involved in runningWith the I/o command to open and stop the PWM, thePWM Drive consists of 3 files: pwm.c, Pwm_fun.h,pwm_fun.c. PWM.C is the driver main program.Pwm_fun.h ref

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

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-proc-entryName: virtual file namesMode: access p

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 "

The HAL hardware abstraction layer is a set of libraries built on Linux drivers. This library is not part of the Linux kernel, but belongs to the application layer on the Linux kernel layer. Linux drivers typically have two types of code in a traditional Linux system. Google for Android to join Hal mainly for the following purposes: Unified hardware Call interface. Since HAL has a standard calling interface, HAL can be used to shield Linux drivers fro