reinstall device driver

and frame synchronization respectively. Xres and Yres are the horizontal and vertical resolution of the screen respectively, and the LCD resolution of common embedded devices is mainly 320*240, 640*480 and so on.Second, frame buffer2.1 Concept of frame bufferingFrame buffering (Framebutter) is an interface provided by the Linux system for display devices, which shows buffer abstraction, shielding the underlying differences in the image hardware, allowing the upper-level application to read and

Platform device driver full dialysis Http://blog.donews.com/21cnbao/archive/2010/07/14/1581997.aspx Th, 2010 by Song Baohua 1.1 platform bus, devices and drivers In the device driver model of Linux 2.6, the bus binds the device and the

file is successfully opened, the file descriptor is returned. If the file fails, the value-1 is returned. If all permissions to be verified have passed the check 0 is returned, indicating that the operation is successful. If one permission is disabled,-1 is returned. When you get the-1 value, you can refer to errno to determine the value returned by the actual device driver. Error code:-The enxio file is a

Article Title: compile a Linux device driver for the system processor. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Introduction Writing Linux device drivers is undoubtedly a complicated task. This article will focus on wri

has an I/O request operationBh_uptodate_lock,Bh_mapped, which is the available buffer for mapped disk blocksBh_new, the buffer is just mapped by Get_block (0) and cannot be accessedBh_async_read, the buffer is being used by the asynchronous I/O read operation through End_buffer_async_read ()Bh_async_write, the buffer is being used by the asynchronous I/O write operation through End_buffer_async_write ()Bh_delay, the buffer has not been associated with a disk blockBh_boundary, the buffer is at t

Author:Liu Hongtao, a lecturer at Huaqing vision embedded College. A Linux USB driver consists of two parts. Some are USB device controller (UDC) drivers and others are hardware-independent function drivers (such as mouse, USB flash drive, USB serial port, USB network, etc ); it can also be divided into three layers: controller drivers, Gadget drivers, and upper layers. I. Controller (USB

Original URL: http://www.cnblogs.com/biglucky/p/4059576.htmlIn the Linux drive, the following members are mainly included in the I²C system:I2C adapter 即I2C适配器I2C driver 某个I2C设备的设备驱动，可以以driver理解。I2C client 某个I2C设备的设备声明，可以以device理解。I²C Adapteris a CPU integrated or external I²C adapter, used to control a variety of i²c slave devices, the

level of the bus is added, and eventually all the connected PCI devices will be detected, the detailed probe process, which we analyze behind. Each PCI device is uniquely identified by a set of parameters, which are stored in the pci_device_id of the struct body, defined in include/linux/mod_devicetable.h: struct PCI_DEVICE_ID { __u32 vendor, device; /* Vendor and

In struct bus_type, two linked lists are prepared for devices and drivers. The struct device represents two members, struct bus_type * bus and struct device_driver * driver. Similarly, the struct device_driver that represents the driver also has two members: struct bus_type * bus and struct list_head devices. The definition of struct

that the effect is not obvious. The reason is: lack of practice. Learning programming is the same as learning swimming, but it is impossible to learn it on paper. Without learning in practice, I soon forgot what I learned. In the end I learned only a rough idea. Starting from today, I will follow the path of "Linux Device Driver (version 3rd)", learn and program, and write this record at the same time to c

Brief introduction The name of the TTY device is abbreviated from the previous telex, originally referred to as a physical or virtual terminal connected to a UNIX system The core of the Linux TTY driver is immediately below the standard character device driver layer and provides a range of functions th

Mac module receives data from the network; (4) The Mac module notifies the DMA module to fetch data; (5) The DMA module extracts the appropriate BD from the BD table; (6) The Mac module sends data to the cache corresponding to the current BD; (7) the network device notifies the processor to start receiving data (in interrupted or polling mode ); (8) The protocol layer removes data from the current BD cache. Step (3 )~ (6) The hardware is automaticall

Relationship between applications and library functions, kernels, and drivers Applications, libraries, kernels, and drivers: the application calls the application function library to complete the function, the application accesses various resources in the form of files, the application function library, some functions directly complete the function, and some functions are called through the system. The kernel calls the kernel processing system. Call the devi