install device driver

SPI is "Serial peripheral Interface" abbreviation, is a four-wire synchronous serial communication interface, used to connect microcontrollers, sensors, storage devices, SPI device sub-primary device and two from the device, for communication and control of the four lines are: CS Chip Selection Signal SCK Clock Signal Miso the data input from the

Character-driven programming model:1. Device Description Structure Cdev 1.1 structure definition1.2 Device number1.3 Device Operation SetIn the Linux system, the types of devices are very diverse, such as: Character devices, block devices, network interface devices, USB devices, PCI devices, platform equipment, hybrid devices ..., and the

be read or written, and any error messages. The control register is written by the host.To start a command or change the device's (working) mode. The data input register is used to obtain the input, and the data output register is sent to the host.Sending result. Therefore, the basic interface between the processor and the device is the control and Status Register. When the processor executes the program and encounters

20150225 IMX257 Device Driver Model Sysfs file system knowledge Point integration (II.)2012-02-25 Li Hai alongThe day before yesterday we realized a simple Sysfs kobject driver, but did not find a lot of things do not understand, the reason is that in our work on SYSFS and Kobject do not understand, although I have been not advocating all day contact with those b

First, we know that the driver is part of the kernel, so what role does the driver play in the kernel?The role of the device driver in the kernel: they are separate "black boxes" that enable a particular hardware to respond to a well-defined internal programming interface that completely hides the work details of the

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

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

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

Linux systems integrate devices and drivers into device-driven models to manageDevice driver Features:1, initialization and release of hardware devices2, manage the device, including the parameter setting, and provide the unified operation interface to the device.3. Read the data that the application passes to the

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

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

does not support random access or request buffers.In Linux, a network device can also be called a network interface, it does not have the same device number as the character device and the block device, only a unique name such as eth0, eth1, etc., the name does not need to correspond to the

1. Exception DescriptionIn front of Muzi already talked about the graphics driver and CPU microcode patch update, today the wood to talk about the adaptation of Bluetooth and wireless card device driver problem, it is not only suitable for the new driver installation, but also suitable for driving abnormal repair. By d

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

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