iic i2c

This article is based on a week CC2541 notes summarySuitable for overview and quick index of knowledge--All Links:Intermediate Tutorial-osal Operating system \osal operating system-a preliminary study of experimental osal"Insert" sourceinsight-Engineering Establishment methodIntermediate Tutorial-osal Operating System (Osal System solution basic routines)Intermediate Tutorial-osal Operating system (learn more about-oled normal keys and 5-directional buttons-interrupts!!!) This system drive laye

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

1. StartI want to drive the OLED screen on the lychee pie, but the write driver in the kernel is definitely a hassle for me, so I'm going to go back to the second, I want to operate the generic I²c interface in the application layer to implement the OLED driver.I bought the OLED is the classic model, four-pin IIC interface OLED. First I refer to Nanopi's Matrix Library, referring to his IIC application laye

Through the/dev/i2c-n node, the user can directly access the I2C peripheral registers on the userspace board, mainly through i2c_rdwr this IO control command to pass i2c_msg array to kernel to execute. The following code can complete this function: #include In android/external/new I2c-util directory, the above source code into ANDROID/EXTERNAL/

The underlying communication with yesterday's written IIC, today combined with official information successfully read all the specified register data attached to the source codeInclude.h mainly includes some stm32 IO control macro definitions, specific reference to all routines in the time Atom Sys.h header fileInc#ifndef __px4flow_h#define__px4flow_h#include"include.h"//Device Address#definePx4flow_addr 0x42//Register macro definition, if it is 2 byt

Tags: Linux arm iic i²c EEPROM Read and write operationSeveral sets of i²c buses are detected[Email protected]:~# i2cdetect-li2c-0i2c OMAP i²c adapter i²c adapteri2c-1i2c OMAP i²c Adapter I²c Adapter[email protected]:~#Check the online status of the device on each bus:-y means yes,0 represents/dev/i2c-0[emailprotected]:~#i2cdetect-y-r00 12345678 9abcdef00: -------------------- ------10:------------------ --

#ifndef __myiic_h_#define __myiic_h_#include "Common.h"#include "Delay.h"#include "debugserial.h"SDA 027 SCL 028IO direction setting#define IIC1_SDA_IN () p0dir (27) = 0#define IIC1_SDA_OUT () p0dir (27) = 1IO operation function#define IIC1_READ_SDA p0in (27)//input SDAvoid My_iic_init(void); Initializing the IO port of the IICvoid My_iic_start(void); Send IIC start signalvoid My_iic_stop(void); Send IIC St

Debugging a new hardware platform over the past two days. MCU Still yes S3C2410 . This platform adds RTC Module, the chip used is Ds1337 . This is IIC Interface clock chip. Some problems were encountered during debugging, MCU Always unable Ds1337 Communication took some detours and wasted a lot of time. Later I found that IIC Of SDA And SCL Reversed. To facilitate debugging in the future 2410 Und

Reprint: http://blog.chinaunix.net/uid-26833883-id-3823530.htmlfirst, the hardware connectionLet's take a look at the wiring on the LM75 hardware:Where i2c_sda0 is the data line, I2c_scl0 is the clock line, they are received s5pc100 GPD3 and GPD4, as shown inWhen simulating IIC, use the GPD3 pin to send data or read data, with the GPD4 pin to provide a clock signal.second, data structuredue to the large number of pins in this group of S5pc100 's GPD,

the program ......Compared with the 51 program, most of them are the same. Here I will mainly explain the differences between the two.It can only be counted as a platform transplant ....The source program will be appendedReading and Writing SDA and SCLIn fact, the implementation of IIC Bus Protocol is to control the two lines so that data can be transmitted at the specified time.Among them, the most important thing is the write operation on the SCL a

provides the I²C bus driver and device-driven registration, logoff method, the I²c communication method ("Al2gorithm") upper layer, with the specific adapter-independent code and detection equipment, detect the device address of the upper code, etc. This part is platform-independent. This corresponds to the i2c2core in the drivers directory in the Linux kernel source code. C.i²c bus driver : The I²C bus driver is the implementation of the adapter end in the hardware architecture of I²C. The I²c

I²c Bus (iii)---Understand IIC in C languageIn order to deepen the understanding of the I²c bus, using C language to simulate the IIC bus, while watching the source code side reading waveform:The sequence diagram of the write operation as shown:The reading sequence is understood in the same vein. For those who do not understand the timing, please refer to "I²c Bus (ii)---timing"The complete program is as fo

Disclaimer: This article is an original work and copyright belongs to the author of this blog. All. If you need to repost, please indicate the source Http://www.cnblogs.com/kingst/ Introduction In this section, we will talk about the iic bus experiment. In the hardware, we have applied 24lc04, a 512-byte EEPROM. The IIC interface is not integrated in the niosii. To implement this function, we

#ifndef __iic0_h_#define __iic0_h_#include "Common.h"#include "Delay.h"Specified state in the IIC communication process#define Status_sendstart 0X08//already sent starting condition#define Status_repeatstart 0X10//Duplicate start condition has been sent#define Status_sendslave_ack 0X18//sent from the machine write address, received ACK#define Status_sendslave_nack 0X20//sent from the machine write address, no ACK received#define Status_senddata_ack 0X

This period of time in the national photoelectric Design competition, the use of PX4 Px4flow optical flow sensor, using software to simulate IIC reading data will lead to Px4flow, check the source of data and optical flow, found this optical flow with the STM32 hardware IIC, So the timing requirements of the software simulation IIC may be a little higher, so in t

First, IIC IIC is a multi-master bus, IIC does not have a physical chip selection signal line, no quorum logic circuit, only use two signal lines-' serial data ' (SDA) and ' Serial Clock ' (SCL). The IIC agreement stipulates that: First, each IIC equipment has a unique seven

AT24C02 is provided by ATMEL, iic bus serial EEPROM (electronic eraser programmer read only memory). Its capacity is 2 kbit (256B) and its operating voltage is between 2.7 v "5.5v, the production process is CMOS.Generally, digital chips are GND and VCC in the lower left and upper right corner. Capacity Calculation Method: AT24Cxx: 01 "1024Capacity = xx * 1 kbit.Write process:The fixed part of the AT24C-series EEPROM chip is 1010, A2, A1, and A0 pins c

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

interrupt handlers, interrupt context processing delay, and call rules for some functions (http://blog.csdn.net/samantha_sun/article/details/6790492 of the IIC interrupt driver) 1, the interrupt handler can not use sleep function functions, such as ioremap,kmalloc,msleep, the reason is that the interruption program is not a process, no process concept, so there is no concept of sleep;2, the delay in the interrupt handler can be replaced with a busy wa

I have basically understood the basic knowledge of IIC in the previous blog. In fact, I still have a few blind spots, because after I learned 51, I got in touch with the MSP430, and then used 430 as a project, I am not very familiar with ok6410 directly, so I will first list some of my knowledge blind spots ~~ · 1. When we analyze this program, we need to print the data information in the ROM through the serial port. Therefore, the serial port Initial