iic i2c

SPI (Serial peripheral Interface: Serial Peripheral Interface ); SpiThe bus consists of three signal lines: serial clock(SCLK), serial data output(SDO), serial data input(SDI). SPIThe bus can implement multipleSPIdevices are connected to each other. ProvideSPIof the serial clockSPIdevice isSPIhost or main device(Master), other devices areSPIslave or slave device(Slave). The master-slave device can achieve full-duplex communication, and when there are multiple slave devices, you can also add a li

It took a long time to write something.Recently I am working on an IC card reader, which is not encrypted. It is actually an EEPROM. In fact, there is no technical content, as long as you have used EEPROM.Important: the IIC communication protocol is the basis of a single piece of learning and one of the required communication protocols. However, I found a very important thing.Is the originalThe IIC protocol

The driver is suitable for all Ferroelectric series I2C Fram, only the capacity, level (3V and 5V), the driver is for 51MCU, but only slightly modified for other MCU can be used. When the amount of storage data is small and the frequency of reading and writing is frequent, I2C FRAM can be selected. This CODE is designed to demonstrate how the fm24c04/fm24c04a serial FRAM couldBe interfaced to the 8051 micro

An in-depth understanding of I2C bus clock synchronization and bus arbitration Each IIC bus device has the same circuit structure of the SDA and SCL pins, and the output drive of the pins is connected with the input buffer. The output is a field effect tube with an open drain path, and the input buffer is a high-input impedance phase generator [1]. This type of circuit has two features: ① Because SDA and SC

I recently checked the Linux 2.6.21 kernel's I2C driver and checked the relevant information on the Internet. I am also right about the error. I have some experience. Let's record it. There may be many mistakes in it. please correct them.1. I2C Protocol1.1 Working Principle of I2C busThe I2C bus is a serial bus consist

terminate. • Send the internal register address you want to write, and the EEPROM responds to it; • Send data · When the EEPROM receives the stop signal, it enters into an internal writing cycle, requiring 10ms, which will not be answered by the EEPROM during this period; (This can result in a delay between two writes, which can cause failure) Description The ① main controller establishes a communication relationship with the corresponding controller by sending the address code. While the othe

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

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

}Note: When the mpu_ad0 is dangling/connected to GND, the IIC slave address of the module is: 0X68; When the mpu_ad0 is connected to VCC, the IIC slave address of the module is: 0X69.Why write more a 0x69, is because the actual test found PIN8 and PIN9 short-circuit ... So the baby's heart is bitter not to say.Need to add files.. \.. \.. \.. \.. \components\drivers_ext\mpu6050\mpu6050.c.. \.. \.. \.. \.. \c

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

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

4 bus driver 4.1 Overview The I2C bus driver is a software implementation of the I2C Adapter. It provides the ability to complete data communication between the I2C adapter and the slave device, such as the start, stop, response signal, and master_xfer implementation functions. The I2C bus driver is described by i2c_ad

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

IICVsSPIToday, in low-end digital communications applications, we are seen in IIC (inter-integrated circuit) and SPI (Serial peripheral Interface). The reason is that these two communication protocols are ideal for near- low-speed inter-chip communication. Philips (for IIC) and Motorola (for SPI) have developed both standard communication protocols for different backgrounds and market requirements.IIC was d

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

Each device on the IIC needs an address register to determine its own address. Each device on the IIC needs an address register to determine its own address: Many devices are used to determine the address by hardware.Some in the factory when the address is set up, the user can not change, some identified several, the remaining several by the hardware to determine (for example, there are three users determi

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

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

If the last byte in the read process does not send ACK to the device, the device will not send data. Otherwise, the device will automatically send the byte data of the next address! The previous modification (http://blog.csdn.net/knock/archive/2009/11/02/4758818.aspx) is incorrect. Case master_receive :..... If (g_uiic_pt = g_uiic_datalen) {g_piicreg-> iiccon = ~ (1 IIC bus, and copy it to the application's buffer2. modify the iic_ist () in the interrupt service to determine a read or wr