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the "Latent" State until there is a system call)3. When a device is operated, that is, when a system call is made, various service functions provided by the driver module are called.4. Uninstall the driver module
I. Driver Loading
The Linux driver can be directly compiled i
important thing is its fs_ops member. You need to implement interfaces in fs_ops for specific devices.
Whether to use interrupt handling
Memory Access
If the video card does not have its own video memory, the system memory is allocated as the video memory.
The graphics card comes with a video memory and is accessed using the I/O memory interface (request_mem_region/ioremap ),
For more information about how to write drivers, see "Linux
size of all device descriptors behind 4, know the remaining device descriptor size, you can read the remaining device descriptors 5. Then put the device into the Usb_bus_type's dev link list 6. Remove the Usb_bus_type from the driver list Usb_driver 7, the Usb_interface and usb_driver of the id_table comparison (for the USB mouse is the ultimate comparison of the interface descriptor under the Binterfaceclass;binterfacesubclass; Binterfaceprotocol; t
chapterThe first driver counts the number of words. In addition to introducing a lot of theoretical knowledge of Android porting and Linux Driver Development, this book allows you to enter Another world of Linux. There is no ess
", 0x50)
. Platform_data = AT24C08,
}
;Because there may be multiple I2C devices, keep them in an array.
Then use the I2c_register_board_info function to register the array of our defined I2C devices into the Linux kernel:
I2c_register_board_info (0, Mini2440_i2c_devices, array_size (mini2440_i2_devices));
So where to register this I2C device. Typically in the system initialization of the Developm
This article is done original, reproduced please specify the source, respect for the original.Writing this article, I refer to some blogs on the Internet:Http://bbs.chinaunix.net/thread-3634524-1-1.htmlHttp://www.bkjia.com/gjrj/800182.htmlAlso refer to the "Linux driver development in detail" 3.4 chapters, to achieve the establishment of their own drive directory
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In the previous article, we introduced the framework of the character device driver. In this article, we will operate on the real hardware-led.
Author: canghai hunter Source: http://blog.csdn.net/embedded_hunter reproduced please indicate the source of embedded technology exchange QQ group: 179012822
I. experiment environment
Development machine environment
Operating System: Ubuntu 9.10
Cross-compiling env
Linux drivers using multiple methods6.4.1 using Ubuntu Linux to test Linux driversTest Linux Driver code: Book P886.4.2 testing Linux drivers on the Android emulator via native (Native
example of this book. This book mainly introduces the Development Board debugging environment and how to install the Android system on the Development Board. The Linux driver examples in this
★ Overall IntroductionLED driver mainly realizes the hardware drive of 4 LED lights on the TQ2440 Development Board, realizes the Pin GPIOB5, GPIOB6, GPIOB7, The high and low level setting of the GPIOB8 (the configuration of the PIN is already implemented in the COMMON-SMDK.C), the driver is called by the test program, and the LED light is illuminated by command.
ZZ from http://blog.csdn.net/fudan_abc/archive/2007/06/23/1662739.aspx
By the way, record this blog: the Linux USB driver development of Mingyue may be available in the future.
The three important concepts of the Linux device model are bus, device, and driver. that is
★ General IntroductionLED driver mainly realizes the hardware drive of 4 LED lights on the TQ2440 Development Board, realizes the Pin GPIOB5, GPIOB6, GPIOB7, The high and low level setting of the GPIOB8 (the configuration of the PIN is already implemented in the COMMON-SMDK.C), the driver is called with the test program, and the LED light is illuminated by comman
During this time, I have been working on Android drivers. The underlying Android driver is exactly the same as that of Linux. So I am going to make a special topic here. I will summarize the Linux driver and lay a solid foundation for the next driver
Android system transplantation and driver development-Chapter 5-Build a test environment for the Development Board and android-based development
The embedded system installed on the Development Board is much simpler than that on the mobile phone, and there are many extended
other than sound, please decide on your own) Please install your personal situation and select the corresponding hardware configuration, save and exit, and then execute: make dep
Make dep // compile this step.
The above is for the same core and core source code. If the source code you downloaded is different from the core version you are using, go to the Internet to view the related core compilation articles and recompile the core, however, those who do not have a deep understanding of
Board. Android NDK Test Linux DriverTest Linux drivers on the development Board using Java code6. Compile the driver into the Linux kernel for testing1th step: Put the source file file into the Linux kernel source code2nd Step: M
Recommended for Android development books: From Getting started to mastering the series Learning Route book IntroductionTransferred from: http://blog.csdn.net/findsafety/article/details/52317506Many times we will continue to receive questions from beginners, "What are the classic introductory materials and learning routes for Android?" "," What are the recommendations for the Android
When compiling the scull program of ldd3, the compilation fails, and the problems encountered are the same as those encountered by the following buddies,
Follow the steps below to solve the problem and record it here.
/*************************************** **************************************** **************************************** ********************/
Recently, I was reading the character device driver scull in
Android has become one of the most popular operating systems in the world. Thousands of smartphones and tablets are running Android. Android based Linux system architecture, developed by Android company. The company was acquired by Google in 2005. The best part about Android is that it's an operating system that allows users to tailor their needs. If you're an Android developer, you don't have to worry about Google suing you for modifying the system.
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