I2c Communication Between Two Stm32

Besides, I2C can support a multi-master system. This timeout is implemented between two I2C frames in the same command. read (80, 2) with SMBus (1) as bus: bus. According HiTechnic, The Gyro Sensor can measure up to +/- 360° per second of rotation and the rotation rate can be read up to approximately 300 times per second. – Standard 20-pin ribbon cable with 2. For example, for a Write memory command, a timeout is inserted between the command-sending frame and address memory-sending frame. Is there any software (bit-banged) I2C driver for that purpose available? I've depleted both the I2C1 and I2C2 lowlevel I2C nodes as I2C-master. This library allows you to communicate with I2C / TWI devices. Today I am going to interface LCD to STM32 using an I2C device (PCF8574). Exosite: Easily interface with Exosite's device HTTP API. Communication via I 2 C is broken up into messages. The STM32 line of microcontrollers are a popular implementation of the ARM Cortex-M core from STMicroelectronics. TTL equivalent signals from the interface are available at CON3. The advantage of I2C. I have to connect 12 in Nos PCA9554 to read data on its input i/o at 400KHz SCL frequency. I2C EEPROM Code Example Project With PIC Microcontroller. How to create the communication between stm32 and esp32 via IIC (IDFGH-1206) #3511. Google "avr i2c" and there should be a TON of examples, I2C is very very popular form of communication. The I2C bus consists of three data transfer speeds such as standard, fast-mode and high-speed-mode. There are also I2C level shifters which can be used to connect to two I2C buses with different voltages. Program one STM32 board for SPI master and other is SPI slave. Take a look at the HAL API documentation for your particular board, and you’ll notice that there are lots of other I2C functions. We are coders (C, java, python. I used to work with i2c communication protocol on arduino using wire library but I cannot get. This I2C tutorial shows you how the I2C protocol or more correctly written I 2 C (sometimes written as IIC) stands for Inter IC Communication and is intended for very short distance communication between ICs on a single PCB. For example, two physical SPI interfaces are reflected with separate Access Structs for SPI0 and SPI1. Well you generally don’t but as I mentioned in my previous article that we can connect upto 128 devices on the same line of I2C and let’s say we want to connect two different LCDs on the same I2C line, than we can’t use two PCF8574 with same addresses and we need to modify one of them. Posted on March 3, 2017 by rafpe. I continued trying to get an I2C communication with the openMV but still have no luck. My configuration is as followed: 7-bit addressing mode (no dual address, only OAR1) 100khz speed. This is a fast communication protocol that can be used to exchange small messages (up to 250 bytes) between ESP32 boards. Before selecting any communication protocol. We should be aware that this is software I2C. My name is Mahmoud form Turkey, I'm trying to connect Delta Hmi with modbus protocol using RS485 connection method to STM32f103C8. I am going to use STM32CubeMx to generate necessary code and than edit the code in Keil uvision 5. A I2C Scanner for Arduino. I2C is half Duplex Communication protocol at a time transmit or receive operation will be done. I2C and SPI are mostly used for MCU to sensor communication in same board. I2C is sometimes also referred as TWI, which is short for Two Wire Interface, since it uses only 2 wires for data transmission and synchronization. Just like the previous example we need to detect the time difference between two successive capture events. UART is widely used for serial communication between two devices. I2C Protocol. Communication should and will always occur between two a Master and a Slave. communication between them. However, I'm always rather confused why people want to use I2C to communicate between two micro's, there are MUCH easier ways, a simple serial (RS232 style) connection is always my preferred method. In addition to the App Notes pityu listed read and study AN736. Hot-swapping is widely employed to keep these systems running, however today’s sensitive high-speed serial communication busses were not designed to facilitate hot-swapping. NET, C++, Java, Labview APIs for I2C communication; TCP/IP Network support (I2C via Internet) more >>> telos I2C Flasher. In MBED board has two I2C functionality support on its GPIO pins. Each device is recognized by a unique address. STM32-H405 The STM32F405RGT6 performance line family has an embedded ARM core and is therefore compatible with all ARM tools and software. * It implements a high level communication layer for read and write * from/to this memory. How I2C Communication works? I2C communication was first introduced by Phillips. For example, for a Write memory command, a timeout is inserted between the command-sending frame and address memory-sending frame. Because the data sent from the device 1 should be received in the device 2 and vice versa. So, I don't know what address to put in the mega receiving the data. A bit is like. For example between Raspberry Pi and Arduino. (I'm using hardwire library because wire library was not working with BMP085). I2C is a low-bandwidth, short distance protocol for on board communications. Some extra information: Wire Connection: I2C1: PB6 - SCL. The I2C hardware. In addition to the App Notes pityu listed read and study AN736. But this library can be used with other versions like ADS10115. First two lines used to add the library of ADS1115 and I2C communication. The Serial Peripheral Interface (SPI) bus was developed by Motorola to provide full-duplex synchronous serial communication between master and slave devices. I2C (prounouce "eye-square-see") is a two-wire bidirectional communication interface. Today I am going to interface LCD to STM32 using an I2C device (PCF8574). See full list on rafpe. We have two tracks connected to pin 55 and 56 (PD8 and PD9 respectively) for I2C communication, where the STM32 would be the I2C-slave. Start Condition(S) As seen from the timing diagram, a data transfer is initiated with the Start(S) condition. An I2C is good for slow-speed data communication with multiple devices, among multiple masters over a 2-wire bus. There is no standard communication protocol for SPI. The interface between STM32 -- Arduino is I2C and the interface between Arduino Pro Mini--ADNS3080 is SPI. Keywords: I2C, SMB, serial interface, i2c bus, 2-wire buses, smbus APPLICATION NOTE 476 Comparing the I²C Bus to the SMBus Dec 01, 2000 Abstract: The I²C bus and the SMBus™ are popular 2-wire buses that are essentially compatible with each other. I2C I2C is two-wire communication protocol between devices. read (80, 2) with SMBus (1) as bus: bus. I2C Between 2 Arduino’s. We are coders (C, java, python. The lightweight board allows connection between Evo sensors and an I2C/UART-supported device, allowing, for instance plug’n play compatibility with Pixhawk autopilots. , TarMAC [17]. There is an Analog, Digital, Serial and I2C port on the GoPiGo. The I2C bus consists of two lines: serial data line (SDA) and serial clock (SCL). A serial data line (SDA) and a serial clock line (SCL) carry the information between the devices, therefore two port pins are required. I2C Functions for MBED LPC1768. I'm using simulink suppport package for arduino to program two arduino megas. Serial communication on pins TX/RX uses TTL logic levels (5V or 3. Welcome to this course on embedded systems for STM32: I2C protocol masterclass. Let's see how to program it and what it can do. I2C uses only two wires: SCL (serial clock) and SDA (serial data). Serial, 8-bit oriented, bidirectional data transfers can be made at up to 100 kbit/s in the Standard-mode, up to 400 kbit/s in the Fast-mode, up to 1 Mbit/s in the Fast-mode Plus (Fm+), or up to 3. This makes the I2C bus/protocol suitable for this task. Additionally, I2C also handles the interrupt. Programming STM32 for I2C Communication. Atmegas have built-in I2C modules that enable communication of 127 or more I2C devices. The UART is good for basic, full-duplex communication between two devices with a similar clock. As we all know serial communication is a very important tool for debugging, connecting with external. Supports the telos I2C Interfaces Tracii XL, Tracii XL 2. Closed Herwey opened this issue May 21, 2019 · 3 comments Are both STM32 and ESP32 powered by 3. One benefit: the arduino has to handle only one extension, the Wii Motion Plus. By Volker Soffel MicroController Pros Corporation May 1, 2003 This paper is the first in a series about various microcontroller communication interfaces, their application, features, benefits and disadvantages. One interesting fact about the $2 price tag for the board (remember it also includes shipping) is that STM32F103C8T6 MCU itself is supposed to sell for $2. R1 works as protection resistor in case STM32 MOSI pin somehow enters into push-pull output. Initialize the pins i. One on which the data is sent (SDA Serial Data Line) and on the other the synchronization clock (SLC Serial Clock Line). The function IfxI2c_I2c_initModule() initializes and activates the I2C module with the user configuration in master mode. The situation is the stm32 couldn't get the data from the nrf52 but I can actually the data flowing through the SDA channel via the oscilloscope. The SPI bus, which operates at full duplex (means, signals carrying data can go in both directions simultaneously), is a synchronous type data link setup with a Master / Slave. This timeout is implemented between two I2C frames in the same command. I2C stands for Inter Integrated Circuits. I2C is a synchronous serial bus protocol used for serial communication between components on the same board. I2C/UART Backboard is an easy to clip-on interface board, compatible with all sensor modules of TeraRanger Evo family. However, I'm always rather confused why people want to use I2C to communicate between two micro's, there are MUCH easier ways, a simple serial (RS232 style) connection is always my preferred method. The serial port, professionally called Universal Asynchronous Receiver/Transmitter (UART) communication, is generally used to program and debug the Arduino via the USB port. It was developed in the year 1982 by Philips. I2C makes it possible to connect multiple masters and slaves to your board while maintaining a clear communication pathway. Connections. CH341A is the USB interface chip capable of I2C, SPI and serial communication. It is primarily used in the consumer and telecom market sector and as a board level communications protocol. github-actions bot changed the title How to create the communication between stm32 and esp32 via IIC How to create the communication between stm32 and esp32 via IIC (IDFGH-1206) May 21, 2019 Copy link Quote reply. I2C Arduino I2C communication can also be used between two Arduino boards ; Used only for short distance communication and uses a synchronised clock pulse. STM32F103C8 I2C Overview. Comparison between SPI and I2C Communication. I2C is a synchronous serial bus protocol used for serial communication between components on the same board. When the board was being designed, we didn't know if we were going to use SPI or I2C for communication between the two micros. So, the SPI and I2C lines were added between the two micros. It only needs two signal lines in the physical layer: SCL and SDA, which is clock and data line respectively. Posted on March 3, 2017 by rafpe. It is widely used in embedded systems to interface a microcontroller with peripherals. Hi all, I am currently building I2C communication between nrf52832 and a stm32 chip, stm32 as the master and nrf52 as the slave. NET, C++, Java, Labview APIs for I2C communication; TCP/IP Network support (I2C via Internet) more >>> telos I2C Flasher. As with most microcontrollers, almost all STM32 parts come equipped with 1 (or more!) I2C interfaces. (I2CDevice) - posted in Netduino 2 (and Netduino 1): I have two I2C devices in my project, both are of type I2CDevice, they look like this: /// /// Encapsulates communication and management of the Analog Devices ADXL345 3-axis accelerometer. My name is Mahmoud form Turkey, I'm trying to connect Delta Hmi with modbus protocol using RS485 connection method to STM32f103C8. Initialize the pins i. It requires the STM32 to embed a bootloader compliant with ST application note AN3155 or AN4221. Onboard CH340 serial port to USB chip, easy to check AD sampling result via USB port on PC. ESP-NOW is very versatile and you can have one-way or two-way communication in different arrangements. The data rate of I2C is between the serial ports and SPI. #include #include First line defines the sesnor type and address mode, we are using ADS1115. R2 is pull-up resistor as required by SPI. To generate basic USB CDC device with CubeMX, follow this previous post , but change Middleware USB profile to CDC. Serial communication is primarily intended for communication between two devices. I use stm32f103rb-nucleo examples_ll (I2C _OneBoard_Communication_IT) but it works for one byte and after that it stops working. 96" IIC I2C 128X64 OLED LCD Display Module Arduino/STM32 M45 The IIC/I2C communication, as long as the two IO ports will be able to. An Access Struct is the interface of a driver to the middleware component or the user application. Connections. So, here it is, STM32 USB CDC – communication with PC over USB, generated with STM32CubeMX on STM32L100 discovery board. The ATECC508A I2C address can be modified from default by writing a new value into the configuration zone. An SPI is good for full-duplex, high-speed data communication with two or more peripherals. A high to low transmission on SDA line while SCL is high is defined as a Start condition. Buy STM32L152QDH6 - Stmicroelectronics - ARM MCU, Ultra Low Power, STM32 Family STM32L1 Series Microcontrollers, ARM Cortex-M3, 32bit. Today I am going to interface LCD to STM32 using an I2C device (PCF8574). modbus tcp/ip stm32 c free download. Every message is between a master device, which initiates the message, and a slave device, which responds. Here one Arduino will act as Master and another one will act as Slave. Communication between devices is master and slave-based. I can see the code written for Master is somewhat different that regular I2C code we used while reading RTC or EEPROM. Raspberry PI Multiple I2C Devices: Frustrated because you can not use multiples of the same I2C devices in your project. Figure below shows the timing diagram for I²C. We use such a MASTER-SLAVE connection to decrease the work load on one Arduino, or to connect more sensors to project etc. 96" IIC I2C 128X64 OLED LCD Display Module Arduino/STM32 M45 The IIC/I2C communication, as long as the two IO ports will be able to. Google "avr i2c" and there should be a TON of examples, I2C is very very popular form of communication. This timeout is implemented between two I2C frames in the same command. Many applications use the I2C serial communication protocol to connect sensors due to its simple two-wire interface. This program is a project for MCU stm32f103zet6 to achieve I2C communication. CANBus is a good selection for node to node communication. Master generates a clock signal, initiates, and terminates data transfer. Using I2C to Communicate with a Child Device. More over transmitting information over the I2C bus will improve system performance, since the transmission of digital data is much less susceptible to interference from environmental noise sources. Serial data (SDA) and serial clock (SCL) carry information between the devices connected to the bus. Pin to pin verification between pcb and firmware on stm32 micro controller POSKAST is deploying innovative technology in the retail industry. The I2C hardware. In some cases you would like to have a complete control over I2C communication. There are various ways to do such communication, and hence this series. So, I don't know what address to put in the mega receiving the data. As indicated in Table 9 above, STM32F051 supports three speed mode (frequency mode) for the I2C communication: 100kHz, 400kHz *and. github-actions bot changed the title How to create the communication between stm32 and esp32 via IIC How to create the communication between stm32 and esp32 via IIC (IDFGH-1206) May 21, 2019 Copy link Quote reply. As a quick recap I2C, or the ”Inter-Integrated Circuit Bus”, is a method of exchanging serial data between two or more devices. STM32 micros just like any other micro provide hardware for serial communication. Just like the previous example we need to detect the time difference between two successive capture events. STOP: This ends a. How I2C Communication works? I2C communication was first introduced by Phillips. I2C EEPROM Code Example Project With PIC Microcontroller. I2C protocol uses 2 wires: SCL: Serial Clock, clock for serial synchronization SDA: Serial data, bidirection line for receving and transmitting Both wires need external pull up resistor, from about 4k7 to 47k, if you don. LED Pin as OUTPUT and Button Pin as INPUT and begin the I2C Communication. For example, for a Write memory command, a timeout is inserted between the command-sending frame and address memory-sending frame. , TarMAC [17]. Welcome to this course on embedded systems for STM32: I2C protocol masterclass. It combines the high performance ARM Cortex-M3 CPU with an extensive range of peripheral functions and enhanced I/O capabilities. Program one STM32 board for SPI master and other is SPI slave. Fig: I2C Pins of MBED Board. How to Measure Digital Logic The easiest way to test your Logic Analyzer is to use it to measure digital signals, that is, voltages that transition between two discrete values, such as 0 V and 3. However there are two exceptions, which are particular signals to indicate the start and end of communications. In this tutorial we learn I2C interfacing with STM32 Microcontroller, and Configuarations for I2C control register, Data register and Status register. Synchronous Microcontroller Communication Interfaces: SPI and Microwire versus I 2 C. I want it to work repetitively. between devices. I2C is a Synchronus Tx and Rx communication. Also it can provide your communication speed requirements. The different compare to I2C module is, we need to create our own data protocol. Define the LED pin and Button Pin as PC13 and PA0. Pin to pin verification between pcb and firmware on stm32 micro controller POSKAST is deploying innovative technology in the retail industry. We should be aware that this is software I2C. This option is mandatory for I2C interface. The Cortex family also supports setting and clearing of bits within two 1Mbyte regions of memory by a method called bit banding. Some extra information: Wire Connection: I2C1: PB6 - SCL. Serial communication is primarily intended for communication between two devices. Start Condition(S) As seen from the timing diagram, a data transfer is initiated with the Start(S) condition. The SPI bus, which operates at full duplex (means, signals carrying data can go in both directions simultaneously), is a synchronous type data link setup with a Master / Slave. It has two wire communication lines 1) SDA (Data line) 2) SCL (Clock line). I want to use one mega to send a number to another mega. – Standard 20-pin ribbon cable with 2. SPI can communicate with multiple devices through two ways. Pages: [1] Topic: I2C Communication between Stm32 and. I am trying to use I2C communication but have failed at it because simulink does not allow you to set an address for the mega sending data. The signalling must adhere to a certain protocol for the devices on the bus to recognize it as valid I 2 C communications. I2C is a serial, synchronous, half-duplex communication protocol that allows co-existence of multiple masters and slaves on the same bus. I would guess that it is 8-bit. To indicate a start of I2C communication, the master would take SDA from high to low while the SCL is high. I2C Communication with PIC Microcontroller PIC16F87. A serial data line (SDA) and a serial clock line (SCL) carry the information between the devices, therefore two port pins are required. I2C two boards Advanced Communication IT/DMA : Exercise: I2C Two Boards Communication Polling : Exercise: Multiple I2C data buffer transmission/reception between two boards in interrupt mode with restart condition. I2C is a 2 line (plus common ground) communication method for one master device to control up to 112 slave devices OLED display SSD1306 in MicroPython. ” The chip, the PI6ULS5V9511A provides a bidirectional buffer between the card’s SDA and SCL signals and the system’s live busses. Hardware CS (NSS) management must be disabled and user shall manually control CS using GPIO output. When the board was being designed, we didn't know if we were going to use SPI or I2C for communication between the two micros. Sending single data between Arduino and. The I2C interface has two main functions: configure the sensor and receive measurement data. Finally, the paper states and demonstrates a solution of I2C communication between two devices as a case study. Components Required. Using I2C, I tested the OLED by turning the display on/off and switching between normal and reverse video. The lightweight board allows connection between Evo sensors and an I2C/UART-supported device, allowing, for instance plug’n play compatibility with Pixhawk autopilots. The Master generates the clock for serial communication(SCL). It consists of a falling edge on SDA while SCL is high. , cooperative navigation, predator prey, and traffic junction. I2C is a 2 wire protocol allowing for 127 devices to be connected to a single bus. Farnell offers fast quotes, same day dispatch, fast delivery, wide inventory, datasheets & technical support. I2C hardwire library communication between 2 (two) stm32 maple mini. When transferring data between two microcontroller systems, people are probably already familiar with I2C and SPI, which are commonly used for low (I2C, 100-400kHz) or high (SPI, 100MHz+) speed data transfer between ICs. I am going to use STM32CubeMx to generate necessary code and than edit the code in Keil uvision 5. To indicate a start of I2C communication, the master would take SDA from high to low while the SCL is high. Delivery options and delivery speeds may vary for different locations. Bi-directional open-drain hardware pins. This I2C tutorial shows you how the I2C protocol or more correctly written I 2 C (sometimes written as IIC) stands for Inter IC Communication and is intended for very short distance communication between ICs on a single PCB. Connection is established via two conductors. There are, of course, numerous communication interfaces: three I2C interfaces, three USART interfaces (two of which may even reach a speed of 10 Mbit / s), four SPI interfaces at 42 Mbit / s: all available on I/O pins that are also remapped on Morpho connectors (CN7 and CN10). I2C protocol uses 2 wires: SCL: Serial Clock, clock for serial synchronization SDA: Serial data, bidirection line for receving and transmitting Both wires need external pull up resistor, from about 4k7 to 47k, if you don. Blog Entry How to use I2C-bus on the Atmel AVR Microcontroller February 4, 2009 by rwb, under Microcontroller. I have used a pull up resistor of 10K. Alternatively I²C is spelled I2C (pronounced I-two-C) or IIC (pronounced I-I-C). The stm32 has two i2c buses would it be a better idea using that? The esp8266 bit banged i2c has been a little unstable, I have discovered Re: I2c communications between ESP-12E and STM32 #33022. It is primarily used in the consumer and telecom market sector and as a board level communications protocol. Application backgroundMaster I2C interface is used in chip communication interface,I2C is a two-wire, bidirectional serial bus that provides a simple, efficient method of data exchange between devices. The serial port, professionally called Universal Asynchronous Receiver/Transmitter (UART) communication, is generally used to program and debug the Arduino via the USB port. The situation is the stm32 couldn't get the data from the nrf52 but I can actually the data flowing through the SDA channel via the oscilloscope. Hi all, I am currently building I2C communication between nrf52832 and a stm32 chip, stm32 as the master and nrf52 as the slave. Both I2C and SPI are synchronous (there is a dedicated clock line), local (usually not reaching outside a single device or PCB), single-ended (not differential like HDMI or Ethernet), master-slave, one-to-many busses. ) Open drain output has higher power consumption during active transfers due to the pull-up resistors that are used. The ATECC508A I2C address can be modified from default by writing a new value into the configuration zone. Here one Arduino will act as Master and another one will act as Slave. It supports three communication interfaces: I2C, SPI, and UART. This series covers: the stm32 board, ftdi uart module, st-link programmer, logic analyser, spi and i2c OLED display, nokia 5110 display, simple seven segment display. I2C modules comparison. More over transmitting information over the I2C bus will improve system performance, since the transmission of digital data is much less susceptible to interference from environmental noise sources. I2C was originally invented by Philips(now NXP) in 1982 as bi-directional bus to communicate with multiple devices using just 2 wires/lines. I2C is half Duplex Communication protocol at a time transmit or receive operation will be done. This time, I tried to get the communication between the M7 and H7. Use the two analog pins, A4 and A5, as shown in the table above. STM32 half-duplex SPI connection. That standard has no encryption, and it allows a number of connected devices to directly access. I2C protocol uses 2 wires: SCL: Serial Clock, clock for serial synchronization SDA: Serial data, bidirection line for receving and transmitting Both wires need external pull up resistor, from about 4k7 to 47k, if you don. Browse other questions tagged c i2c stm32 stm32f4 hal-library or ask your own question. Hello everyone, I would like to use SPI protocol in order to communicate between two µC STM32f429. An Access Struct is the interface of a driver to the middleware component or the user application. Inter-Integrated Circuit (I2C) is a Synchronous Serial Communication Port (Protocol) Multi-Master Multi-Slave Bus. By default they will be acting as SDA and SCL. I can see the code written for Master is somewhat different that regular I2C code we used while reading RTC or EEPROM. I2C stands for Inter-Integrated Circuit. Arduino has to receive data through 2 i2c boards ( Temperature,(current,voltage)) and send data to 1 i2c board (pid controller (4-20ma)) Control the heat with pid controller (according to user requirement) Control 2 stepper motors ( steps, speed,direction,delay) the Arduino should start the heat by sending the i2c command to pid controller (4-20 ma) OUTPUT , the Arduino should check temperatur. For I2C communication, a timeout mechanism is implemented, it must be respected for bootloader commands to be executed correctly. The parity setting bits are available in the UPM1:0 bits in the UCSRC Register. STM32 Tutorial NUCLEO F103RB GPIO Pins. Personally, I would just use libraries and spend the time on writing good documentation for your thesis. For our first experiment we will hoo two Arduinos together and exchange data between them. STM32, Add MODBUS SLAVE RTU Communication for my Existing Project Through UART2, KeilC We have STM32F103RTB6 based embedded module with 3. I set the I2C_OwnAddress = 0x2F; You only set it properly when use it as slave. The GoPiGo has 4 ports on it on which various Grove Sensors can be connected. In this mode, the Wii Motion Plus handles the communication and supply sensor values (from gyroscopes and from accelerometers) in an interleaving alternate way. In MBED board has two I2C functionality support on its GPIO pins. It gives you a fully defined protocol for data transfer between multiple devices over two wires. You may be saying - "I2C is also known as the Two Wire Interface. Connections. To establish serial communication between two devices, the devices should be connected as shown below. It was developed in the year 1982 by Philips. Since October 10, 2006, no licensing fees are required to implement the I²C protocol. I am working on a project which needs data communication between two stm32 (stm32f103rb and stm32f429zg). Second example uses second of four pages. Since October 10, 2006, no licensing fees are required to implement the I 2 C protocol. STM32 boards give all kinds of modern communication and debug systems for industrial and home-based with 84MHz procession speed. PA10 - SDA. One benefit: the arduino has to handle only one extension, the Wii Motion Plus. It has two receivers and two transmitters compatible with RS232 signals. 7KHz in the 2190m amateur radio longwave band. I have tested the communication between the STM32 and the Arduino Pro Mini, and between the Arduino Pro Mini and the ADNS3080 sensor. So, the SPI and I2C lines were added between the two micros. This I2C tutorial shows you how the I2C protocol or more correctly written I 2 C (sometimes written as IIC) stands for Inter IC Communication and is intended for very short distance communication between ICs on a single PCB. Only one conversation may occur at a time. Synchronous Microcontroller Communication Interfaces: SPI and Microwire versus I 2 C. I2C/UART Backboard is an easy to clip-on interface board, compatible with all sensor modules of TeraRanger Evo family. I2C EEPROM Code Example Project With PIC Microcontroller. Read And Write I2C Serial EEPROM. Pages: [1] Topic: I2C Communication between Stm32 and. The I2C bus consists of three data transfer speeds such as standard, fast-mode and high-speed-mode. I2C stands for Inter Integrated Circuits. However, both of these protocols are really intended for operation over a short distance, ideally on the same board. I2C communication program between esp8266 and EEPROM Data Storage Module For Arduino. I2C and SPI are mostly used for MCU to sensor communication in same board. Interfacing Serial EEPROM With PIC. In our previous tutorials, we have learned about SPI and I2C communication between two Arduino boards. Personally, I would just use libraries and spend the time on writing good documentation for your thesis. I2C is a Two-wire interface (TWI). Serial communication is primarily intended for communication between two devices. Wholesale Trader of Converter Board - I2C Logic Level Converter 4 Channel Bi- Directional Module, Micro:Bit Board, Mcp2515 Can Bus Module and STM32 STM32VLDISCOVERY Discovery Kit offered by Rajguru Electronics (I) Private Limited, Mumbai, Maharashtra. Note that the Arduino Due actually has two I2C ports. I2C communication between 2 arduinos. R1 and R2 are already soldered on the board with a 0402 footprint. The advantage of I2C. It would be possible to retrieve directly data fro a WMP and a NK with the same I2C bus. 56MHz frequency range. Also, be aware that there are some incorrect hookup diagrams on the internet for the Pro Mini. Project from Richie with 24 I2C Encoder V2 connected to Teesy 3. The lightweight board allows connection between Evo sensors and an I2C/UART-supported device, allowing, for instance plug’n play compatibility with Pixhawk autopilots. Yes, very feasible. I2C/UART Backboard is an easy to clip-on interface board, compatible with all sensor modules of TeraRanger Evo family. This is a fast communication protocol that can be used to exchange small messages (up to 250 bytes) between ESP32 boards. GitHub Gist: instantly share code, notes, and snippets. So it would be great to learn about communication between STM32 and Arduino by using SPI & I2C bus. STM32 has more features than Arduino. STM32F103 I2C (Inter-Integrated Circuit) or sometimes called TWI (Two Wire Interface) is a synchronous serial protocol that only needs 2 wires for communication. The signalling must adhere to a certain protocol for the devices on the bus to recognize it as valid I 2 C communications. Interfacing Serial EEPROM With PIC. I2C is an interesting protocol. modbus tcp/ip stm32 c free download. It is less susceptible to noise than analog communication, and it usually only requires two lines to communicate to hundreds of devices. It requires the STM32 to embed a bootloader compliant with ST application note AN3155 or AN4221. 3 V, although systems with other voltages are permitted. SPI master transmits string to the slave, slave read SPI data and toggle. The bus uses four connections: SDA – the serial data line,. Stm32 timer example code. NFC (Near Field Communication) is a wireless technology allows contactless point-to-point data communication between devices within a short distance of 10 cm. USB62 SPI/I2C Bus Analyzer can analyze and monitor the device communiction on the SPI/I2C Bus. To establish serial communication between two devices, the devices should be connected as shown below. Sending single data between Arduino and. You would need to use a logic level convertor in-between. For I2C communication, a timeout mechanism is implemented, it must be respected for bootloader commands to be executed correctly. This makes the I2C bus/protocol suitable for this task. The OpenCores I2C Master Core provides an interface between a Wishbone Master and an I2C bus. Transform your product pages with embeddable schematic, simulation, and 3D content modules while providing interactive user experiences for your customers. Stm32 spi pull up. I'm using simulink suppport package for arduino to program two arduino megas. This I2C tutorial shows you how the I2C protocol or more correctly written I 2 C (sometimes written as IIC) stands for Inter IC Communication and is intended for very short distance communication between ICs on a single PCB. It was developed in the year 1982 by Philips. Note that during a data transfer, SDA is only allowed to change levels while SCL is low. I2C EEPROM Code Example Project With PIC Microcontroller. The article Using I2C in AVR ATmega32 shows the communication between two ATmega32 controllers single master mode. STM32F410RBT6 ARM Microcontrollers - MCU STM32 Dynamic Efficiency MCU with BAM, High-performance and DSP with FPU, ARM Cortex-M4 MCU with 128 Kbytes Flash, 100 MHz CPU, Art Accelerator NEWICSHOP service the golbal buyer with Fast deliver & Higher quality components! provide STM32F410RBT6 quality, STM32F410RBT6 parameter, STM32F410RBT6 price. I2C is a serial, synchronous, half-duplex communication protocol that allows co-existence of multiple masters and slaves on the same bus. Two pins, Serial Data (SDA) and Serial Clock (SCL), are required. Give it a shot!. The driver chip SSD1306, communicates via I2C only. Welcome to this course on embedded systems for STM32: I2C protocol masterclass. Transform your product pages with embeddable schematic, simulation, and 3D content modules while providing interactive user experiences for your customers. it supports interprocess communication between local tasks but also between local and remote tasks ! in other words this is a true distributed processing system. How crowded is the is the I2C bus loadwise?. Options for remote connection using two STM32-MEMS demonstration boards. _1 means use 128 bytes for display, _2 means use 256, _f means store all pixels. Most common are EEPROMs, RTC, Port Expanders etc. I2C Communication between Stm32 and Atmega 328 now working. I2C Functions for MBED LPC1768. I2C Protocol. Actually it is okay if put the I2C_OwnAddress,it does not affect the STM32 as master in I2C communication. Alternatively, I 2 C is spelled I2C (pronounced I-two-C) or IIC (pronounced I-I-C). That standard has no encryption, and it allows a number of connected devices to directly access. Besides, I2C can support a multi-master system. I2C (read as I Squared C) bus first introduced by Philips in 1980, because of its simplicity and flexibility the I2C bus has become one of the most important microcontroller bus system used for interfacing various IC-devices with the microcontroller. There shall be a new port appears; if that is the case, the new name is the port name of your Arduino. GitHub Gist: instantly share code, notes, and snippets. Then connects the two devices with your USB cable, and type in the command above again. Inter-integrated circuit (I2C) is a system for serial data exchange between the microcontrollers and specialized integrated circuits of a new generation. Learn the Serial communication between two Arduino. 3 volts power on Can be externally powered by 5 volts or 3 volts Can power supply external application with 5 volts and 3 volts. STM32F103C8T6 MCU based STM32 Blue Pill Board. SPI master transmits string to the slave, slave read SPI data and toggle. These values are sent via I2C communication bus. I2C communication is the short form for inter-integrated circuits. An SPI is good for full-duplex, high-speed data communication with two or more peripherals. To perform dual operations just add more i2c_msg instances to the bus call: from smbus2 import SMBus, ic_msg # Single transaction writing two bytes then read two at address 80 write = i2c_msg. Because of its widespread adoption, learning to use I2C communication with MSP MCUs has become essential for helping engineers. When you start the application attached by connecting to the USB port of this product, you can analyze the SPI/I2C communication with a PC. STM32 has more features than Arduino board. To establish serial communication between two devices, the devices should be connected as shown below. Then starts the loop. _1 means use 128 bytes for display, _2 means use 256, _f means store all pixels. I want it to work repetitively. You may be saying - "I2C is also known as the Two Wire Interface. _1 means use 128 bytes for display, _2 means use 256, _f means store all pixels. At the same as SPI, analyzed in a previous article, the I2C (Inter-Integrated Circuit) is a synchronous communication bus used to connect and exchange data between a microprocessor and external devices; it was developed by Philips, now NXP, today it is "de. The I2C communication supports almost unlimited device to communication but the adress value can be 7-bit value. How Serial read and write works. I can't be bothered to lookup the STM32 HAL docs. I am trying to communicate 2 STM32 with I2C. This I2C tutorial shows you how the I2C protocol or more correctly written I 2 C (sometimes written as IIC) stands for Inter IC Communication and is intended for very short distance communication between ICs on a single PCB. The I2C interface has two main functions: configure the sensor and receive measurement data. We’re using the ESP32 default I2C pins (GPIO 21 and GPIO 22). Pin to pin verification between pcb and firmware on stm32 micro controller POSKAST is deploying innovative technology in the retail industry. I2C protocol uses 2 wires: SCL: Serial Clock, clock for serial synchronization SDA: Serial data, bidirection line for receving and transmitting Both wires need external pull up resistor, from about 4k7 to 47k, if you don. For example between Raspberry Pi and Arduino. If the address matches the address internally stored in one of the slaves, it responds and further communicates. Arduino Forum > Using Arduino > Programming Questions > I2C Communication between. I also connected a pull-up resistor on the SCL and SDA lines. between devices. Included: 1 X STM32 AD Sampling Data Acquisition ADC Module. This time, I tried to get the communication between the M7 and H7. Supports a wide range of I2C voltage levels from 1,2 V up to 5,5 V. I set the I2C_OwnAddress = 0x2F; You only set it properly when use it as slave. A jumper here would have made it better. Parallel Communication. I2C communication is the short form for inter-integrated circuits. Synchronous Microcontroller Communication Interfaces: SPI and Microwire versus I 2 C. In this mode, the Wii Motion Plus handles the communication and supply sensor values (from gyroscopes and from accelerometers) in an interleaving alternate way. In order to improve my experience with STM32 I'm curretly trying to start a communication between two STM32 NUCLEO board. 2 Arduino LCD & Touchscreen Tutorial - Duration:. I2C/UART Backboard is an easy to clip-on interface board, compatible with all sensor modules of TeraRanger Evo family. This approach uses four, that is no better than SPI!". SPI master transmits string to the slave, slave read SPI data and toggle. If your professor wants you to re-invent wheels, you take your working Master app and write your equivalent i2c_start() etc. I2C Between 2 Arduino's. STM32 F0 Entry Cortex-M0 48 MHz 1. It uses two bidirectional open-drain lines, Serial Data Line (SDA) and Serial Clock Line (SCL), pulled up with resistors. I2C Communication with PIC Microcontroller PIC16F87. It is a communication protocol developed by Philips Semiconductors for the transfer of data between a central processor and multiple ICs on the same circuit board using just two common wires. GitHub Gist: instantly share code, notes, and snippets. I would guess that it is 8-bit. It only needs two signal lines in the physical layer: SCL and SDA, which is clock and data line respectively. Electronic devices talk to each other by sending bits of data through wires physically connected between devices. We should be aware that this is software I2C. On the Arduino boards with the R3 layout (1. Each device is built to make use of the generic i2cdev code, which abstracts the I2C bit-level and byte-level communication away from each specific device class, making it easy to. I2C2: PA9 - SCL. Document Created by Simon Burkhardt This tutorial is very basic and might not show the best way to use the STM32 environment. SPI master transmits string to the slave, slave read SPI data and toggle. 08w when full-screen lighting, 0. The lightweight board allows connection between Evo sensors and an I2C/UART-supported device, allowing, for instance plug’n play compatibility with Pixhawk autopilots. Finally, the paper states and demonstrates a solution of I2C communication between two devices as a case study. Furthermore, when multiple slaves are present, SPI requires no addressing to differentiate between these. STM32_Software_I2C_Master Thans a lot for the contribution of my classmate Yuqiu Huang(黄宇秋) from the school of Mechanical Engineering in Shanghai Jiao Tong University. (I'm using hardwire library because wire library was not working with BMP085). These micro-controller are specially designed for DC Motor speed and position control application. The advantage of I2C. To perform dual operations just add more i2c_msg instances to the bus call: from smbus2 import SMBus, ic_msg # Single transaction writing two bytes then read two at address 80 write = i2c_msg. Speaking of I2C in Arduino, Pins A4 and A5 are I2C Communication Pins in Arduino UNO where A4 is the SDA Pin while A5 is SCL Pin. it supports interprocess communication between local tasks but also between local and remote tasks ! in other words this is a true distributed processing system. When you start the application attached by connecting to the USB port of this product, you can analyze the SPI/I2C communication with a PC. The master initiates the communication by sending a Start condition on the SDA and SCL line. SPI communication between 2 STM32. It was first introduced by the Philips semiconductors in 1982. Because the data sent from the device 1 should be received in the device 2 and vice versa. Programming STM32 for I2C Communication. As we all know serial communication is a very important tool for debugging, connecting with external. Many applications use the I2C serial communication protocol to connect sensors due to its simple two-wire interface. 7KHz in the 2190m amateur radio longwave band. It aims at enhancing shopper experience in large store via displays broadcasting content that matches shoppers' profiles. Though touted as “32 cents 32-bit micro”, it is not that inexpensive from DigiKey in one-off quantity ($1. It is used when the distance between them is short (receiver and transmitter are usually on the same printed board). A free online environment where users can create, edit, and share electrical schematics, or convert between popular file formats like Eagle, Altium, and OrCAD. STM32 has more features than Arduino board. I2C Functions for MBED LPC1768. In this video, Shawn Hymel used the I2C protocol to connects a NUCLEO_L476RG development board to a TMP102 temp sensor. The signalling must adhere to a certain protocol for the devices on the bus to recognize it as valid I 2 C communications. I2C protocol allows up to 128 devices connected to those two lines where each of them has a unique address. 4 Mbit/s in the High-speed mode. Also it can provide your communication speed requirements. It combines the high performance ARM Cortex-M3 CPU with an extensive range of peripheral functions and enhanced I/O capabilities. › pins –a structure to set the port pins used for the communication. Furthermore, when multiple slaves are present, SPI requires no addressing to differentiate between these. However, both of these protocols are really intended for operation over a short distance, ideally on the same board. The picture on the right is a demo of what should be like. Besides controlling I2C modules, like display and sensors, I2C communication also can be implemented between 2 controllers. The AVR uses 10bit A/D converter to get Gyro Sensor data. Half-Duplex Communication. No need to use slow multiplexers. The lightweight board allows connection between Evo sensors and an I2C/UART-supported device, allowing, for instance plug’n play compatibility with Pixhawk autopilots. 3 V, although systems with other voltages are permitted. It is widely used in embedded systems to interface a microcontroller with peripherals. Using it to control I2C devices is easy with the C/C++ API. Pin to pin verification between pcb and firmware on stm32 micro controller POSKAST is deploying innovative technology in the retail industry. The STM32 line of microcontrollers are a popular implementation of the ARM Cortex-M core from STMicroelectronics. i2c communication with ADXL345 accelerometer Good evening everybody, I'm trying to read data from an ADXL345 accelerometer Brief description of the situation: first the pic sets up the registers writing 3 bytes: devide address+write bit, register address, data. Normally devices, both masters and slaves, are freely interchangeable between both buses. Serial communication is primarily intended for communication between two devices. telos I2C Framework – APIs for I2C communication. I2C hardwire library communication between 2 (two) stm32 maple mini. NFC (Near Field Communication) is a wireless technology allows contactless point-to-point data communication between devices within a short distance of 10 cm. Switching between Arduino cores¶ There are two different Arduino cores for STM32 microcontrollers: STM32Duino and Arduino STM32 (maple). Hi all, I am currently building I2C communication between nrf52832 and a stm32 chip, stm32 as the master and nrf52 as the slave. So this tutorial will show you how to communicate between Raspberry Pi and Arduino Using I2C. Discover the world's research 17+ million members. write (80, [40, 50]) read = i2c_msg. The eighth bit after the start, read/not-write (), specifies whether the slave is now to receive (0) or to transmit (1). Onboard CH340 serial port to USB chip, easy to check AD sampling result via USB port on PC. Communication Protocols –The two devices must also have clocks that are close to // I2C own address registers // Before the STM32 sends its start sequence. Let's see how to program it and what it can do. Slaves are addressed using 7-bit addresses (up to 127 unique devices); 10-bit addressing is also possible. 08w when full-screen lighting, 0. Master device do not need to an adress. Each device is recognized by a unique address. I²C (pronounced I-squared-C) created by Philips Semiconductors for use in communication of peripheral devices within a TV-set and commonly written as ‘I2C’ stands for Inter-Integrated Circuit and allows communication of data between I2C devices over two wires. It was developed in the year 1982 by Philips. Using it to control I2C devices is easy with the C/C++ API. A I2C Scanner for Arduino. It covers the main features of this communication interface, which is widely used to connect devices such as microcontrollers, sensors, and serial interface memories. Furthermore, when multiple slaves are present, SPI requires no addressing to differentiate between these. Hello, and welcome to this presentation of the STM32 I²C interface. You can connect motors and sensors to the GoPiGo. I2C or “Inter-Integrated Circuit” is a simple way to establish two-way communication between microcontrollers and peripherals. I2C communication between 2 arduinos. I2C Interface 4I2C Interface The TLV493D-A1B6 uses Inter-Integrated Circuit (I2C) as communication interface with the microcontroller. Digital communication has numerous advantages. 2020 - Просмотрите доску «I2C-bus on the Atmel AVR» в Pinterest пользователя Dimitrij, на которую подписаны 277 человек. Date: 30-12-16 Online course on Embedded Systems MODULE -11: I2C Bus interface. I2C (read as I Squared C) bus first introduced by Philips in 1980, because of its simplicity and flexibility the I2C bus has become one of the most important microcontroller bus system used for interfacing various IC-devices with the microcontroller. The Ultra Fast-mode is a. During normal operation this clock stretch timeout can be too small, for example when the I2C-HAT is requested to save a parameter in on-board flash, like DigitalOutputs Safety Value, PowerOn Value or the Communication Watchdog Period Value, the flash saving operation may imply a mass erase operation which has the longest duration of the flash. By default they will be acting as SDA and SCL. SCL (Serial Clock) : Shares the clock signal between the master and the slave, where the master always controls the clock signal. Sending single data between Arduino and. In this tutorial we will replace one Arduino board with the Blue Pill board that is STM32F103C8 and will communicate with the Arduino board using I2C bus. How it arrived: Almost 25 years ago, in the early 1980's Philips designed & developed a new bus standard namely I²C bus, for easy communication between Integrated Circuits (especially in TV circuits), which reside on the same circuit board. @d82k The I/O lines used for I2C communication on the Core aren’t 5V tolerant. Both lines require pull-up resistors. STM32 Peripherials–I2C of the two bus wires to VCC (typically 3. In MBED board has two I2C functionality support on its GPIO pins. * It implements a high level communication layer for read and write * from/to this memory. Communication. We have a custom board that uses a STM32 micro and nRF51822 at the same time. For I2C communication, a timeout mechanism is implemented, it must be respected for bootloader commands to be executed correctly. Sure enough, the datasheet does not specify whether 0xC0 is a 7-bit or 8-bit address. This protocol was designed by Phillips Semiconductors around 1992 to allow easy communication between components on the same circuit board and can achieve transfer rates of up to 400 kbit/sec. It would be possible to retrieve directly data fro a WMP and a NK with the same I2C bus. Master generates a clock signal, initiates, and terminates data transfer. 0 pinout), the SDA (data line) and SCL (clock line) are on the pin headers close to the AREF pin. At the same as SPI, analyzed in a previous article, the I2C (Inter-Integrated Circuit) is a synchronous communication bus used to connect and exchange data between a microprocessor and external devices; it was developed by Philips, now NXP, today it is "de. Circuit design Two Arduino Communication Using I2C with one LCD created by Masum Billah with Tinkercad. Today I am going to interface LCD to STM32 using an I2C device (PCF8574). Every message is between a master device, which initiates the message, and a slave device, which responds. However, I'm always rather confused why people want to use I2C to communicate between two micro's, there are MUCH easier ways, a simple serial (RS232 style) connection is always my preferred method. The I2C bus uses two bidirectional signals, one as the serial clock (SCL) line and one as the serial data (SDA) line. 2 Arduino LCD & Touchscreen Tutorial - Duration:. Here i am configuring one STM32 as master & the other as Slave. During normal operation this clock stretch timeout can be too small, for example when the I2C-HAT is requested to save a parameter in on-board flash, like DigitalOutputs Safety Value, PowerOn Value or the Communication Watchdog Period Value, the flash saving operation may imply a mass erase operation which has the longest duration of the flash. Start Condition(S) As seen from the timing diagram, a data transfer is initiated with the Start(S) condition. I2C Arduino I2C communication can also be used between two Arduino boards ; Used only for short distance communication and uses a synchronised clock pulse. Alternatively I²C is spelled I2C (pronounced I-two-C) or IIC (pronounced I-I-C). The AVR uses 10bit A/D converter to get Gyro Sensor data. TTL equivalent signals from the interface are available at CON3. , TarMAC [17]. If the address matches the address internally stored in one of the slaves, it responds and further communicates. Wire your LCD to the ESP32 by following the next schematic diagram. To establish serial communication between two devices, the devices should be connected as shown below. An I2C is good for slow-speed data communication with multiple devices, among multiple masters over a 2-wire bus. Just set any number will do. You would need to use a logic level convertor in-between. Powered by USB cable between PC and STM32 Value line Discovery Embedded debugger ST-Link, JTAG SWD debug support USB interface for programming and debugging Red LED for USB communication, red LED for 3. I2C Interface 4I2C Interface The TLV493D-A1B6 uses Inter-Integrated Circuit (I2C) as communication interface with the microcontroller. Here one Arduino will act as Master and another one will act as Slave. Both the PI and Arduino support two additional types of communication for talking to peripheral devices. I2C is a 2 line (plus common ground) communication method for one master device to control up to 112 slave devices OLED display SSD1306 in MicroPython. Serial communication on pins TX/RX uses TTL logic levels (5V or 3. Also it can provide your communication speed requirements. The needed STM32 hardware resources (I2C and * GPIO) are defined in stm32xx. Wholesale Trader of Converter Board - I2C Logic Level Converter 4 Channel Bi- Directional Module, Micro:Bit Board, Mcp2515 Can Bus Module and STM32 STM32VLDISCOVERY Discovery Kit offered by Rajguru Electronics (I) Private Limited, Mumbai, Maharashtra. Follow these steps to connect two Arduino UNOs. I2C Between 2 Arduino’s. Miele French Door Refrigerators; Bottom Freezer Refrigerators; Integrated Columns – Refrigerator and Freezers. At the same as SPI, analyzed in a previous article, the I2C (Inter-Integrated Circuit) is a synchronous communication bus used to connect and exchange data between a microprocessor and external devices; it was developed by Philips, now NXP, today it is "de. In this Arduino I2C tutorial we will use I2C communication between two arduino boards and send (0 to 127) values to each other by using potentiometer. With these interfaces, there is a provision to connect a device which can communicate using I2C, SPI and UART. Comparison between SPI and I2C Communication. An Access Struct is the interface of a driver to the middleware component or the user application. I2C and Serial can be combined, for example I2C_S_100KHZ (0x40) + SERIAL (0x01) = 0x41. between devices. Communication Protocols –The two devices must also have clocks that are close to // I2C own address registers // Before the STM32 sends its start sequence. The Cortex family also supports setting and clearing of bits within two 1Mbyte regions of memory by a method called bit banding. So this tutorial will show you how to communicate between Raspberry Pi and Arduino Using I2C. STM32 boards give all kinds of modern communication and debug systems for industrial and home-based with 84MHz procession speed. How Serial read and write works. The GoPiGo2 is stacked on top of the Raspberry Pi without the need for any other connections. Some extra information: Wire Connection: I2C1: PB6 - SCL. STM32F103C8T6 MCU based STM32 Blue Pill Board. The Ultra Fast-mode is a. Two pins, Serial Data (SDA) and Serial Clock (SCL), are required. Define the LED pin and Button Pin as PC13 and PA0. 6V 8- /16-bit application STM32 F3 Extended Cortex-M4 72 MHz 1. The advantage of I2C. However, fees are required to obtain I 2 C slave addresses allocated by NXP. I2C or “Inter-Integrated Circuit” is a simple way to establish two-way communication between microcontrollers and peripherals. It combines the high performance ARM Cortex-M3 CPU with an extensive range of peripheral functions and enhanced I/O capabilities. I2C was specifically designed to interconnect multiple IC's on PCB's, in order to reduce the number of required connections between them all - not. I2C is a serial, synchronous, half-duplex communication protocol that allows co-existence of multiple masters and slaves on the same bus. Программирование STM32: Работа с датчиком MPU6050. I2C Protocol. We use such a MASTER-SLAVE connection to decrease the work load on one Arduino, or to connect more sensors to project etc. You can also use the following table as a reference. Using two simple integrated circuits the I2C bus can be extended over tens of meters. In this video, I used STM32 standard peripheral library. I2C is a Synchronus Tx and Rx communication. If your HAL function expects 8-bit you would say: HAL_I2C_Master_Transmit(&hi2c1, 0xC0 << 0, 0x00, 1, 1000); Hey-ho. I2C Between 2 Arduino’s. you replace the library functions using the same API. In SPL if you would like to generate START signal on I2C bus you would use. For example, two physical SPI interfaces are reflected with separate Access Structs for SPI0 and SPI1. Using multiple I2C devices. STM32_Software_I2C_Master Thans a lot for the contribution of my classmate Yuqiu Huang(黄宇秋) from the school of Mechanical Engineering in Shanghai Jiao Tong University. Actually it is okay if put the I2C_OwnAddress,it does not affect the STM32 as master in I2C communication.