i2c header

Revision historyDate issue description authorDirectory1. Summary 32. Introduction 33. I2C architecture 34. I2C bus initialization 45. I2C Adapter Driver 56. I2C Device Driver 97. user space drive support 128. Data Transmission framework 169. References 16 1. SummaryThis article mainly introduces the

is normal. According to the Development Board instructions that the device mounted on the/dev/i2c-1, the existence of the device is detected, the general device drive is normal. The EEPROM device is of the at24c ** series. According to the instruction, the device address is 0x50. The preparation is complete. 1. Compile the IIC. h header file of the Hal interface module. Go to the hardware/libhardware/inclu

should be able to know how to configure the device's registers to make it work better and complete its mission. Haha, is to the device to send commands to control this device. Haha, a sense of achievement .... Note: 1. Regarding the I2C resistance problem, the GT recommendation is 4.7k~10k, but the 2.2K on the board can also. I2C resistance can be roughly used: 1.5k,2.2k,4.7k. Too small can consume too mu

What is an I2C adapter?I read an article about the Linux I2C system, saying that there are two main hardware: one client, one adapter, and the I2C architecture centered around them.But what is adapter? Is it an I2C controller? If so, isn't the I2C controller having a few reg

1. Overview 2. Data Structure 3. Adapter 4. I2c-core 5. Slave Device 1. Overview 1.1 Definition I2C inter-integrated circuit SMBUS System Management Bus, the I2C subset 1.2 Characteristics The amount of data exchanged is small. The required data transfer rate is low. 1.3 Speed Fast speed Kbps Full speed Kbps 1.4 Topology 2 Data Structure Understanding the da

││││ ││││ ││││││││ ││││ ││││││ │││││└─────────────────────────────── ─────────────────────────────────────────┘│├────────────────────────────────────────────────────────────────── ──────────┤││└────────────────────────────────────────────────────────────────────────────┘2. AT24

I. Overview Speaking of writing I2C drivers in Linux, there are currently two main methods: one is to treat I2C devices as a common character device, the other is to use the Linux I2C driver architecture. The two drivers are compared below. The advantages of the first method (corresponding to the disadvantages of the second method) include:● The idea is straightf

I2C (Inter-IntegratedCircuit1 bus is a 2-line serial bus developed by Philips, used to connect 1 Introduction I2C (Inter-Integrated Circuit1 bus is a two-line serial bus developed by Philips to connect the microcontroller and its peripheral devices. It is a special form of synchronous communication. it has the advantages of few interface lines, simple control mode, small encapsulation form, and high communi

I. Overview Speaking of writing I2C drivers in Linux, there are currently two main methods: one is to treat I2C devices as a common character device, the other is to use the Linux I2C driver architecture. The two drivers are compared below. The advantages of the first method (corresponding to the disadvantages of the second method) include:● The idea is straightf

DirectoryFirst, LINUXI2C Drive--Overview 1.1 Written in front 1.2 I2C 1.3 Hardware 1.4 Software 1.5 reference two, LINUXI2C drive--I2C bus 2.1 I2C Bus Physical structure 2.2 I2C Bus Features 2.3 Start and stop conditions 2.4 Data transmission Format 2.5 response 2.6 Bus arbitration three, LINUXI2C drive--analysis of EE

Recently, I am working on a capacitive touch screen driver and using I2C bus interfaces to transmit data. So let's take a look at the I2C bus principles. The I2C bus is a character transmission bus between chips launched by Philips. It adopts two-wire system, which consists of the serial clock line SCL and serial data line SDA. In the circuit design, the

1 I2C communication protocol and S3C2410 chip Introduction I2C (Inter Integrated Circuit) bus was launched by Philips in 1980. The I2C bus transmits information between the bus and the device using two wires (SDA and SCL), serial communication between the microcontroller and external devices, or bidirectional data transmission between the master device and the sl

Port Environment (Bold font in redIs the modified content,Blue bold ChineseFor special attention) 1. host environment: centos 5.5 and 1 GB memory in vmare. 2. Integrated Development Environment: Elipse ide 3. compiling environment: Arm-Linux-GCC v4.4.3 and arm-None-Linux-gnueabi-GCC v4.5.1. 4. Development Board: mini2440, 2 m nor flash, 128 m nand Flash. 5, U-boot version: u-boot-2009.08 6, Linux: linux-2.6.32.2 7. References: Complete embedded Linux application development manual, edited by Wei

This part is prepared for analysis and summarization in several partsBecause I2C communication must have at least two chips, the driver consists of two parts: I2C driver of the main chip I2C driver from the chip Note: What if none of the options are supported ??? (Unfortunately, only two chips can be driven, but the process is similar) (1).

This time I will study the Code with the I2C driver in the kernel. Before going into the code, I will first briefly understand the relationship between the I2C core data structure. From this, we may be able to have a better understanding of the driver code. The design of the software data structure and the relationship between the data structures should at least describe the Organizational Relationship of t

Forward the blog about I2C by Mr. Netease DP, which is easy to find during learning.Recently, it was found that the primary device reset may cause an I2C deadlock when accessing the I2C device. The result is high in the SCL and low in the SDA. After that, it is found that the I2C bus is pulled from the device. After th

I recently encountered some problems when debugging I2C. I hope you can help me with similar problems. Keywords: I2C sub-steady state low speed signal dejitter [Prelude]In the system, the I2C slave function must be implemented in the CPLD to communicate with the I2C interface of the CPU, so as to expand the gpio port

http://blog.csdn.net/cmm20071020/article/details/7179958 upgrade a I2C drive from 2.6.21 to 2.6.39 On the internet to find a post, said the drive is divided into I2C bus, I2C equipment, bus driver to do the actual bus read and write operations, device-driven implementation for different equipment operations. First look at a post to see the overall structure, an

I2C bus is widely used in all embedded systems and is an industrial-level bus. However, because stm32 is a 32-bit MCU, it is doomed that its I2C hardware interface will be powerful, but it will also be difficult to control, unlike 8-bit machines, such as avr8-bit Twi (actually fully compliant with I2C standards) so easy to use. the following are some of my experi

serial monitor, and press ENTER} // when the host notifies the slave to upload data, execute this event void requestEvent () {// send the last byte of the packet sent by the receiving host to the host Wire. send (x); // sends a byte data to the host in response to the notification from the host} I2C is mainly dependent on the wire. h library. Arduino itoa is mainly used for int to char, that is, converting text into characters. > Itoa is a widely use