i2c devices

Linux under the I2C-driven loading process, divided into I2C equipment layer, I2C adapter layer and I2C core layer The I2C device driver layer is the drive we write for a particular I2C device, and the following is the

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

Probe Method of I2C driver framework, i2c framework probe The Linux-based I2C driver adopts the probe method. The Linux driver for any device supporting I2C bus can be written according to the following framework. The I2C device connects to the cpu's specific

= i2cdev_detach_client,}; Struct i2c_dev {Struct list_head list;Struct i2c_adapter * ADAP;Struct device * dev;}; This file provides user-layer access to I2C devices, including common file operations such as open, read, write, ioctl, and release. We can use the open function to open I2C device files, the ioctl function is used to set the address for accessing the

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

This article begins by analyzing the kernel's I2C subsystem. Description: 1. The kernel version of the analysis is 2.6.37.1 2. Development Board for TQ2440, onboard ARM9 (s3c2440) 3.I2C equipment for AT24C02 4. The sequence of analysis is the registration order of the Kernel I2C subsystem (that is, the order in which this series of articles is published). It is

software, I don't know whether it's clear or not? --This sentence is correct. SK | fisker posted on[B] Reply [url = http://linux.chinaunix.net/bbs/redirect.php? Goto = findpost pid = 7280841 ptid = 1168450] 4 # [/url] [I] wmmy2008 [/I] [/B] I have read several articles about the embedded excellent area I2CArticleYou know what's going on.In fact, I2C driver can also bypass the client this thing, direct access to/dev/

operation of hardware I2C is: working at 50 kHz or below, and ensuring that there is no other interruption to interrupt its work. This method is only applicable to scenarios with low speed requirements, such as EEPROM reading. However, high-speed devices, such as AD chips of some models, cannot be used. If you need a high speed (400 KHz), we recommend that you use the alternative solution GD32 of STM32, w

Original article: Documentation/I2C/upgrading-clientsTranslator: Guo shaobei2010/05/10 Update I2C drivers to the new 2.6 Driver Model========================================================== ========== Note: the I2C driver here refers to the I2C client driver, for example, RTC, USBTransceiver driver and so on. Ben doo

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 s

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 mod

, including the I2C main device that the I2C attaches to the device struct I2c_adapter *adapter The I2C from the device driver struct I2c_driver *driver as a member variable that I2C from the device, such as addr, name, and so on, which is specific to the device driver, attached to

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

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 s

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 tran