i2c bus

Bus tycoon task Audit completed, small part of the 24 hours before the completion of the audit, in fact, the actual audit faster, the task of the morning, now has received the results, show the audit through, then now can go to the present, and then the small series to experience. 1, the bus monopoly how to complete the task, we can refer to the previous experience of small series, the following figure i

1 basicIn the device driver often see and platform related fields, distributed in several corners of the driver, which is a more important mechanism in the 2.6 kernel, the principle of understanding it, for the future analysis of the driver is very helpful, the following brief introduction: In the linux2.6 device model, concerned with the bus, device, drive these three entities, the bus will be the device a

Many hardware functions require bus clock support, such as LCD and I2C. This article analyzes the bus clock of S3C2440 and the operations related to the clock frequency of S3C2440 bus in Linux. First, analyze the bus clock of the hardware S3C2440. 1. S3C2440 fclk hclk pclk:

provides the I²C bus driver and device-driven registration, logoff method, the I²c communication method ("Al2gorithm") upper layer, with the specific adapter-independent code and detection equipment, detect the device address of the upper code, etc. This part is platform-independent. This corresponds to the i2c2core in the drivers directory in the Linux kernel source code. C.i²c bus driver : The I²C

What does the bus do? Plainly, it is used to transfer data between parts of the computer. For example, my main memory stored in the data CPU to use, need a line to pass it, the CPU internal registers between, register and Alu, CU and various parts and so on, and so on many places, in short, the parts need to transfer data The transmitted data is divided into three kinds, corresponding to three kinds of functions of the

implementation of the adapter in the I²C hardware system. Contains the algorithm structure of the adapter data structure I2c_adapter and adapters primarily i2c_algorithmI2c_adapter1 structI2c_adapter2 {3 structModule *owner;/*Owning Module*/4UnsignedintId/*the type of algorithm, defined in I2c-id.h, starts with I2c_algo_*/5Unsignedint class;6 structI2c_algorithm *algo;/*Bus communication method s

5, 5, 4, platform platform bus working principle5, 5, 4, 1, what is platform bus(1) Platform bus is different from i²c, USB, SPI, PCI bus, they belong to the physical bus, platform bus is a virtual

************************************ after starting /void I2cstart () {sda=1;delay10us (); SCL=1;DELAY10US ();//setup time is SDA hold time >4.7ussda=0;delay10us ();//Hold Time is >4USSCL=0;DELAY10US ();}(2) I²c stop signalWhen the SCL line is high, the SDA line represents a stop signal from a low-level to high-level change./************************************************************************** function name : I2cStop () * Functions: Stop signal: The SDA signal produces a rising edge

In the device-driven model of the kernel, the three entities are concerned with the bus, device, and drive.When the system registers a device, the bus looks for the matching driver, and the bus will look for the matching device when the system is registered with each driver.A realistic Linux device and driver usually need to be mounted on a

in the Maemo platform, D-bus is a very important middleware (middleware) solution, primarily for communication between processes. There are already a lot of services using D-bus, and then there are different ways to implement them. D-bus is run through the Maemo platform, inseparable from the D-bus. This part of the

===============================This article is the original site, welcome to reprint!Reprint please indicate the source: http://www.cnblogs.com/gdt-a20 =============================== The kernel developer will be the bus, device, drive the three are abstracted from the software idea, cleverly established the relationship between the two, make it more visualization. Combined with the knowledge that we have learned before, in general, the relationship b

Common faults and solutions for computer bus interface once had such a statistical report: computer failure in 40% from the computer's bus interface! Since the computer is plugged together by a variety of accessories, it is difficult to ensure that each slot can work stably, such as this or that problem, although the search is cumbersome, but not surprising. Therefore, when you understand the impact of th

Springcloud (ix): Configuration Center and message bus (configuration center finalization)In Springcloud (vii): Configuration Center svn example and refresh, refresh we can use the mechanism of Webhook to flush the client each time the client gets the latest configuration information if it needs to be executed, and when clients are getting more and more , which requires each client to be executed again, this scenario is less appropriate. Using spring

I became a blog expert after finishing the original embedded Linux Series blog post, now launched to let more readers benefit."Understanding the Linux series from a demand perspective: bus, device, and drive" is a methodological article on how to learn embedded Linux systems, and the beginning of understanding Linux system software from the perspective of demand, expecting this series of articles to be the benchmark for learning Embedded Linux in the

1. the generation and development of CAN Bus Controller Local Network (CAN-Controller Area Network) is a multi-host Local Network launched by Bosch for modern automobile applications, its outstanding performance has been widely used in industrial automation, a variety of control equipment, transportation tools, medical instruments, construction, environmental control and many other departments. The local network of controllers will be popularized in C

;) V const V0, 0x7f030024 invoke-virtual {p0, v0} , Lcom/baidu/bus/activity/offlinedatamanageactivity;->setcontentview (I) V4. From 1, only one expandablelistview,id in this layout is expandlistview_all_cities, the corresponding value is 0x7f06009f, Find the place to use this value in Offlinedatamanageactivity:Const V0, 0x7f06009finvoke-virtual {p0, v0}, Lcom/baidu/bus/activity/offlinedatamanageactivi

frequency of the CPU to a multiple of the external frequency, so as to increase the frequency by increasing the frequency. Therefore, after 486We are exposed to two new concepts: External frequency and frequency doubling. The relationship between them and the clock speed is the external frequency X multiplier = the clock speed. The external frequency of a CPU and today'sDay we often say that the FSB (front side bus, Front End

D-bus three-tier architecture D-bus is a message bus system for communication between applications for communication between processes. It is a 3-tier architecture of the IPC system, including: 1, function library Libdbus, for two applications to contact and interactive messages. 2. A message bus daemon based on Libdbu

Computer composition principle-system bus and computer composition principle1. Basic concepts of Bus 1. Why should I use a bus? Von noriman divides computers into five parts: memory, memory, controller, input device, and output device. Many channels are required to connect these devices.2. Bus

Since I bought a car, I seldom take the bus. However, the perception of the bus for a long time, these daily Mercedes-Benz in the city on the road of the big guys, year after day, without a clear say to carry who on the road, but does not affect them always on schedule from the starting point, shun smooth to reach the end. Share a little bit about bus and softwar