bus x11

Four drive units: the D-bus bus and S-bus bus for the CONTEXT-M3 core, the Universal DMA1, and the general purpose DMA2. Four driven units: internal Flash (internal Mountain village memory), internal SRAM, FSMC, AHB to APB Bridge Ahp2apbx. The Icode bus is the

Forwarded from: http://blog.sina.com.cn/s/blog_4af327e10101irie.htmladvantages and disadvantages of D-busLinux does not have a good IPC mechanism. Windows, Mac OS, Android also has "binder" subsystem. Linux has sockets, FIFO, shared memory and other mechanisms, which are not very good for the application layer. Kdbus attempts to create a mechanism that is similar to other systems for Linux.D-bus is the closest approach to this standard on Linux. Pros:

Label: style blog HTTP color ar use SP strong data Reprinted please indicate the source: http://blog.csdn.net/lg2lh/article/details/8042008 The basic protocol of PCI is not introduced here. Because the General chip protocols are well integrated, I only need to know about them. I don't need to know the protocol too much because I don't have to do chips. The explanation here is based on the PLX 9054 (9052) chip. I am only a beginner and hope to criticize and correct it. I. Address in

About I2C and SPI bus protocols Iicvs SPI Currently, in the low-end digital communication application field, we can see IIC (Inter-Integrated Circuit) and SPI (serial peripheral interface) everywhere. The reason is that these two communication protocols are very suitable for close-range and low-speed chip communication. Philips (for IIC) and Motorola (for Spi) have developed these two standard communication protocols for different backgrounds and mark

Time: 2016-12-12 huaqing Vision1. PrefaceThe CAN (Controller area Network) bus, which is a control LAN bus, is an effective serial communication network that supports distributed control or real-time control. It is widely used in industrial field control, intelligent buildings, medical devices, transportation and sensors due to its high performance, high reliability, unique design and suitable price, and ha

I²C transmits data between devices connected to the bus using only two lines (SDA and SCL). Each device is identified by a unique address (whether it is a microprocessor, LCD driver, memory, or keyboard interface) and can be used as a transmitter or receiver depending on the function of the device. The LCD driver may be just a receiver, and the memory can send and receive data. In addition to transmitters and receivers, the device can be used as a hos

1. Bus system structureThe system consists of a matrix consisting of multiple interconnected 32-bit AHB buses 8 Main bus –CORTEX-M4 with FPU core I-bus, D-bus and S-bus –dma1 memory bus –dma2 memory

Even after four years of study in Wuhan, I feel that Wuhan is incomparable with Beijing in many aspects, such as city construction and quality. However, there is one aspect that Beijing envy, that's the speed of public transportation in Wuhan! Even when I see traffic congestion in Beijing, I miss it even more ......Take the bus 521 and catch up with another 521. At that time, some people reminded us to pay attention to safety. As a result, the driver

Nowadays, there is no uniformity in the naming of the same thing on the Internet. It seems like there are many types of things, so it is necessary to clarify the clues first, find out the equivalence relationships between different names: 1. CPU external frequency = External frequency 2. CPU frequency = clock speed 3. Frontend bus frequency 4. System bus frequency 5. MultiplierRelationships: The externa

Loaded from http://blog.csdn.net/sjwangjinbao/article/details/6077225When writing a bus device driver, it was found that the struct device in the 2.6.33.2 kernel had no members of BUS_ID, and the const char *init_name member was found. However, this member cannot be used directly to set and read the device name.The method for kernel operation is dev_name and Dev_set_name. The definition in the kernel is:1) dev_nameStatic inline const char *dev_name (c

transmitted from inside the computer to the output serial data stream. A serial that is external to the computerThe data is converted to bytes for use by devices inside the computer that use parallel data. In the output serial data stream, add theParity bit and parity with the data stream received from the outside. Add a start-stop flag to the output data stream,And remove the start-stop flag from the receiving data stream. Handles interrupt signals issued by the keyboard or mouse (keyboard and

From: http://blog.csdn.net/flowingflying/article/details/5411124 The D-bus method is very important in mobile phone operating systems, including Linux-based operating systems such as maemo and moblin. It is estimated that andriod is also widely used. For more information about D-bus, see:Http://www.freedesktop.org/wiki/Software/dbusThere is also a large amount of learning materials on the Internet.Http://

widely heard. for programming in Linux or windows, the addresses operated by the program are all virtual addresses. Virtual Address is a combination of hardware MMU and Software Memory Management to facilitate more efficient use of RAM. Memory Management is a big article. I will not talk about details here. For details, refer to the memory addressing chapter of utlk. Logical Address virtual address can be operated by software developers Based on System Programming and bare coding. 3. physical

The message bus and activity system penetrate into the Linux desktop-general Linux technology-Linux programming and kernel information. The following is a detailed description. D-BUS is a promising message bus and activity system that is starting to penetrate into Linux®Desktop. Understand the reason for creating it, its purpose, and development prospects. 　　 D-

The overall solution of a recent project was designed as a distributed system, so it struggled with the CAN bus or RS485 communication. Therefore, I searched some documents about RS485 and CAN bus on the Internet. In addition to further understanding of RS485 communication characteristics, I also learned the characteristics of CAN bus and its comparison with RS48

1 basic In the device driver often see and platform related fields, distributed in many corners of the driver, this is also the 2.6 kernel of a more important mechanism, the principle of its understanding, for later analysis of the driver is very helpful, the following brief introduction: In the linux2.6 device model, care about the bus, the device, drive the three entities, the bus will be device and drive

I2C (Inter integrated circuit, internal integrated circuit) bus is a very inexpensive and efficient network for interconnecting peripherals in small, embedded systems. The I2C bus is sometimes called IIC, which has a history of more than more than 20 years. The I2C interface and the SPI interface work the same, but the two methods are different. 　　 The I2C bus us

Last night, I started to check the LCD and found that the front bus was not very well mastered. Later I summarized the reasons: First, I understood the bus principle very early, and second, there was no big routine during bus learning, third, it was just returned from the Dragon Boat Festival holiday and it was not in the status. Forget it. If you don't have a re

Need to rent a house in a new place or buy a house, an important consideration is whether the traffic is convenient, I rent the house when I would like to know from the bus station around me, can not transfer to where, I had this demand after the Internet search, and did not find similar features, and the trouble is, Baidu map the most basic API also does not show the interface of multiple lines at the same time, so only with the help of Baidu map ove

1) Overview Bus is a simple system that uses its own threading mechanism to distribute messages from a pipe thread to an application. The advantage of the bus is that when GStreamer is used, the application does not require thread recognition, even if GStreamer has been loaded with multiple threads. Each pipeline contains a bus by default, so the application does