helo device

On mobile devices, the need for virtualization is growing. One is that mobile device configuration is getting higher, and some high-end configurations are close to desktop devices, which lays the groundwork for virtualization and, second, a growing diversity of user scenarios for mobile devices. Mobile devices are now not only used for entertainment, but also for work; third, security and privacy issues are increasingly prominent. There are more priva

about how to write a misc device, in the previous article has introduced the approximate process, now let us implement a simplest Misc device driver. http://blog.csdn.net/morixinguan/article/details/52700146The following four articles about the preceding character device can be used as a reference:http://blog.csdn.net/morixinguan/article/details/55002774http://bl

Linux Device driver inductive summary (eight): 3. The layering and object-oriented thought of equipment management Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx The previous section describes the relationships and operations of the bus, device, and driver functions. Starting from this section, we introduce the layered thinking and object-oriented thinking in equipme

Tags: important contex ICA mod options map kernel variable EALLinux network devices are different from character devices and block devices, and no files correspond to network devices. The application operates the network device through the socket.The network device driver belongs to the data link layer, communicates with the IP/ARP protocol, and directly operates the physical layer chip (NIC Chip). The thre

Linux is a variant of the UNIX operating system. The principle and idea of writing a driver in Linux is similar to that of other Unix systems, but the drivers in the DoS or window environment are very different. In a Linux environment, the driver is designed with simple ideas, convenient operations, and powerful functions. However, it only supports a small number of functions and can only rely on functions in the kernel. Some common operations should be compiled by yourself, debu

Linux is a variant of the UNIX operating system, and the principle and idea of writing a driver in Linux is similar to that of other Unix systems, but it is very different for drivers in DOS or window environments. Design the driver in the Linux environment, the thought is concise, the operation is convenient, the function is also very formidable, but the support function is few, can only depend on the function in the kernel, some commonly used operation to write by oneself, and debugging also i

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

Memory mapping is one of the most interesting features of modern Unix systems. As for drivers, memory mappings can be implemented to provide direct access to device memory by user programs. A clear example of a mmap usage can be seen from a subset of the virtual memory areas that are viewed to the X Windows system server: Cat/proc/731/maps 000a0000-000c0000 rwxs 000a0000 03:01 282652/dev/mem 000f0000-00100000 r-xs 000f0000 03:01 282652/dev/mem 004000