i2c voltmeter

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

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

1. i2c-dev Interface I2C Dev-Interface Generally, I2C devices are controlled by a kernel driver. However, in the user space, you can also access an I2C device: you need Load the i2c-dev module. Each registered I2C adapter (Contr

============================================Author: yuanluluHttp://blog.csdn.net/yuanluluCopyright No, but reprint please retain this paragraph statement============================================ According to their own understanding, the http://lxr.linux.no/linux+v2.6.34/Documentation/i2c/instantiating-devices is translated into the document about enumerating and establishing i2c_client. Have objections or questions please refer to the original, af

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

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).

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

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

Linux i2c subsystem architecture, linuxi2c Subsystem Writing i2c Device Drivers (slave devices) can be either of the following methods: 1. You can write an independent Slave Device Driver and use it directly. 2. the Linux kernel has implemented a general device driver. The general device driver is used to write an application (User-mode driver) and a large number of interfaces provided by the device driver

Simulation of I2C bus multi-master communication research and Software Design Author:■ Zheng Xuyang, Xi'an University of electronic science and technology, Li Bingbing, Huang Xinping Abstract:This paper introduces the principle of multi-master communication simulating I2C bus, and proposes a new implementation method. This method uses delayed receiving comparison to implement arbitration, so that common Mic

The premise is that the driver of the I2C controller must have been running normally, the standard I2C tool can only read and write to 8-bit address, but the EEPROM of this 16-bit address will be powerless So this kind of 16-bit address for read and write support, in the embedded domain is still very common The main use of standard Linux I2C interface, struct i2c

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

It is important to connect the operating system with the corresponding hardware devices and write drivers that connect the hardware and software. This article mainly discusses how to design and implement the driver with I2C interface on the S3C2410 chip under the wince operating system. It introduces in detail the compiling method of the stream driver program under wince, at the same time, the driver is compiled into the operating system through platf

EmbeddedLinux Bare Metal Development (13)--i²c communication a,IIC Protocol 1. Introduction ofIIC bus i2c (Inter - integrated circuit) bus is a philips The company developed a two-wire serial bus for connecting microcontrollers and peripherals. i2c Bus is a serial data bus, only two signal lines, one is two-way cable sda and the other one is the clock line scl

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

Reproduced in front of a lot of articles on I2C, to finish a project, but also to write their own points I2C experience, I this is a pure application angle, want to see the principle, to see reprinted articles, people write a lot better. For a I2C device, the device file is the simplest and most complex, saying it's simple because it's very easy to provide code u

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