Stm32 i2c library

In this part, I'll show how to connect to an HDC1080 temperature and humidity sensor through I2C communication. Amazon. 96 inch monochrome OLED display from Geekcreit is connected or interfaced to an Arduino. This works flawlessly. Two Potentiometers are also connected with STM32 (PA0) and Arduino (A0) to determine the sending values (0 to 255) from master to slave and slave to master by varying the potentiometer. To start I would try to get it working by polling that means that you can disable all I2C interrupts. Jan 8, 2018 I2C is a common communications protocol for talking to peripheral devices. At the physical level it consists of 2 wires: SCL and SDA, the clock and data lines respectively. I also had an Adafruit Wire. As you can see above PCF8574 has 4 input pins GND, VCC, SDA, SCL and 16 output pins. All your code in one place. How do I use the STM32CUBEF4 HAL library to read out the sensor data with i2c? Browse other questions tagged stm32 i2c stm32f4 or ask your own question. Several years ago I wrote couple of articles about beautiful library u8glib in context of STM32 microcontrollers. Click on File menu and then Preferences I2C or Inter Integrated Circuit ( sometimes just referred to as just two-wire interface ) is a great method of individually communicating with over 100 devices on only 2 wires. be/Vqa32DgDxF0 How to use LCD 16x2 in STM32 using I2C. \$\endgroup\$ – Cezar Chirila Apr 3 '18 at 14:05 The STM32 board is a Flip32 flight controller which is already using I2C to get sensor information from accelerometer, gyro, compass and barometer, so I'm using the same I2C functions that it uses to access those sensors. It is based on Eclipse and the GNU GCC toolchain and supports out-of-the-box all ST-provided evaluation boards (Eval, Discovery or Nucleo). c; i2csoft. (which use the I2C protocol ) with an stm32 board. The default frequency of the I2C interface is 100KHz. I2C Events. Still, every now and then, there's that module that just won't work. Some devices (boards) comes with clear designation on the PCB, some with misleading designation – address is shifted to the left, so for example OLED display typical address is 0x3C/0x3D (depends of address selector jumper), but shifted to the left by 1 bit You mentionned that the ISR flag is always busy. To have excellent control of the I2C interface lets split the whole process into multiple functions. The row of pins is attached to the same row of pins on any HD44870-compatible LCD. Separately they work: Adafruit SSD1306 Adarfuit VL6180 May 5, 2018 STM32F103 I2C (Inter-Integrated Circuit) or sometimes called TWI (Two Wire Interface) is a synchronous serial protocol that only needs 2 wires  Feb 1, 2013 I2C Communication peripheral application library (CPAL) . The I2C interrupt routine is entered every time the I2C module generates an interrupt, then it is up to the state machine in the efm32_i2c library to handle and clear the active interrupt flags. However I2C as a whole requires a reasonable amount of protocol overhead so its not the fastest method of communicating with outside peripherals. This is the I2C LCD "backpack" I was referring to: At the center of the board is the PCF8547 controller by NXP. The original 1602 LCD needs 7 IO ports to be up and running, but ours is built with IIC/I2C interface, saving you 5 IO ports. After some email for I2C library for HAL, I’ve made it. LiquidCrystal I2C. Because the SSD1306 library is relying on the standard “Wire” Arduino library to abstract out the underlying I2C bus complexity, using this OLED library directly on the STM32 that features 2x real hardware I2C bus results in a massive waste of efficiency (read: power consumption and processing power). If you haven’t read my previous post about I2C go HERE. 96 128×64 OLED Display – I2C/SPI Interface [SSD1306-0. To select the desired I²C module, simply change the letter x in the routine prototype for a number from 0 to 5. Using with I2C The display can be used with any I2C microcontroller. This time, we As we all know, STM32 doesn’t build in EEPROM in the package. Often so have we all implemented an I2C connection. Here it is. Serial LCD Driver for STM32. In this article we will step over introducing an I2C backpack for that display. I2C LCD in STM32 July 12, 2017 ARM, As promised, today I am going to interface LCD to STM32 using an I2C device (PCF8574). Hi, A ADC, DMA library for the STM32 would be a great asset. i think it wold better if letting us to chose driving i2c customely or by your library drive this preferal. hd44780: Extensible hd44780 LCD library. These routines are hardware independent and can be used with any MCU. The STM32 Nucleo board provides an affordable and flexible way for users to try out new ideas and build prototypes with any STM32 microcontroller line, choosing from the various combinations of performance, power consumption and features. If you think, that title of this post consists of all possible random words, you are wrong:) This is what I've been trying to make work correctly during the last days! I2C1-> CR2 &= ~(I2C_CR1_SMBUS); // I2C mode Otherwise you set all the bits in the CR2 register except I2C_CR1_SMBUS which is left unchanged. The I2C interface can be used for writing data words out of the I2C port, returning the data recieved back from I2C slave. com: 0. 5K pull-up resistors (R3, R4) on the I2C line (SCLK, SDA) I had an important breakthrough today with my code, so I decided I might as well document it. Thermo 15 click provides an accuracy of ±1°C in the range from 0°C to 70°C. The following code is a routine that uses the I2C library function to read HTU21D temperature data. Because the I2C interface is for 'writing' to the display only, you'll still have to buffer the entire 512 byte frame in the microcontroller RAM - you can't read data from the OLED (even though I2C is a bidirectional protocol). Tutorial 3: Connecting an OLED display to ESP8266 Posted on February 1, 2017 by R-B Leave a comment | Whether you want to show sensor readings, implement a navigational user interface menu, or display diagnostic information during prototyping a project, a graphic OLED display is always a cool add-on to embedded systems. The frames may then be processed by FFT's and windows at a lot lower rate than the individual sample rate. There is no need for a wordy introduction to I2C protocol. In this tutorial, we will use I2C bus for communication between Arduino and STM32F103C8, and will learn about SPI bus in next tutorial. HAOYU Electronics SSD1306 0. You can edit the i2csoft. Like Like. Data is transmitted using only 2 wire over i2c with the PCF8574. Before you can use the I2C interface, you may need to use the gpio utility to load the I2C drivers into the kernel: gpio load i2c. This course teaches you the hands-on skills of STM32 programming using HAL library. A collection of embedded software mbedded software libraries and examples for STM32 MCUs, including standard peripheral libraries with low level drives, touch libraries, audio libraries (MP3, WMA, Speex, …), example code as referenced in various Application Notes. The Breakout has a STM32 Microcontroller to control VL53L0X with I2C interface. The library can be compiled for almost any AVR device like ATmega8,ATmega168,ATmega328 etc. In this library, we can configure the GPIO for LCD in lcd16x2. The LL and HAL are complementary and cover a wide range of applications requirements. For debugging purposes, USART is used, which was discussed in earlier tutorials. The BME280 library calls the Arduino Wire library to access the I2C Bus. h library the compiler was trying to use instead of the Arduino one. As soon as I started to read about the library I realized that it does not support STM32, not mentioning the HAL library. PCF8574 can be used as a port extender I2C scanner for STM32f10x series. The input voltage range is from 3-5V. STM32 Low Level (LL) library is a new library for programming the STM32 series. org). 63 , MDK-ARM V3. See the IMPROVED Version https://youtu. Contribute to geoffreymbrown/STM32 -Template development by creating an STM32-Template/Library/i2c. Also, the reason why I could read the EEPROM was that you can read it whole (starting from 0x00) without transmitting anything. I2c is nice because it only uses two pins, and you can put multiple i2c devices on the same two pins. This LCD is ready-to-use because it is compatible with the Liquid Crystal Library. This I2C tutorial shows you how the I2C protocol or more correctly written I2C (sometimes written as IIC) stands for Inter IC Communication and is  234 results Microchip PIC32, Nordic nRF51, Nordic nRF52, ST STM32, Teensy, TI MSP430, Adafruit 9DOF Library, LiquidCrystal_PCF8574, Infineon XMC,  Aug 20, 2016 Using the STM32 HAL libraries to work with I2C EEPROM's. OLED display based on a SSD1306 OLED driver IC. The SSD1306 Display interfaces to microcontrollers through a I2C/SPI interface. So it would be great to learn about communication between STM32 and Arduino by using SPI & I2C bus. Now, I will show another example with DMA and I2C to read raw data from MPU6050 acceleration and gyroscope sensor directly. So here you need only 2 pins i. I searched a lot for the libraries but all I could find were that of arduino. Modifying the HAL I2C library (specifically, the Mem_Read() function, to take more parameters than just memory location) resulted in a fix. We'll be showing how to connect with an Arduino, for other microcontrollers please see our MCP23008 library code for the commands to send to the i2c i/o expander. More about I2C is described here. The Software I²C library enables you to use MCU as Master in I²C communication. h> library is used in programming STM32F103C8. STM32F0 I2C Tutorial based on CubeMx and HAL library. The four pins on the side are the one you'll attach to the Arduino or any I2C-supported microcontroller. For do this follow the steps below. Share / 2018-11-27 / Tech. In the previous post, an example of using STM32 DMA to perform a simple data copy between 2 arrays was introduced. But the presumption I normally make is that a library may not work because they are often designed to use AVR specific functionality Anyway UPDATE: u8glib is outdated now and there is new library u8g2, with full community support. I used the . I2C Acknowledge fail STM32 - Page 1 StdPeriph library as much as I can, and when that fails me (which is a lot less than the HAL), I bang on the registers myself Tutorial: Using the ARM CMSIS Library Posted on February 14, 2013 by Erich Styger One of the great advantage of using an ARM core as on my FRDM-KL25Z board is that I can leverage a lot of things from the community. 3V LDO is inside. OLED I2c Display With Arduino: In this instructable I will show you how to connect and test a 0. h. To my Making the I2C work with the new HAL library on ARM Cortex Mx (STM32Fxx) Processor Added 1. How to connect and program the Geekcreit 0. officeboy 2015-04-08 22:41:50 UTC #1. In our case, you don't need external pull ups, because library uses  Jan 7, 2019 In this STM32 I2C tutorial we will configure the STM32F103C8 as Master The same <wire. c. zip library installation method for the TinyWireS library. Since the Wire library is not defined in Blue Pill, we provided our own version of the Wire library, which is injected via until the transfer is finished. WiringPi includes a library which can make it easier to use the Raspberry Pi’s on-board I2C interface. > stm32F103C8 arduino IDE I2C; Print. Author Frank de Brabander STM32F0 I2C - Tutorial 7 with STM32CubeMX 13 May 2017 on stm32 i2c tutorial , stm32f0 i2c , stm32 i2c cubemx , stm32 i2c hal , stm32f0 tutorial Hi everyone, I’m back :) Another year has come with lots of opportunities and challenges presented to me as I now become a fresh PhD candidate at Nanyang Technological University (NTU) Singapore. I am using STM32f103c8t6 but as I mentioned before, the code will remain same for all STM32 devices. To interface the LCD with STM32F103, you need the library files (lcd16x2. h file’s I/O Configuration area to do that. 6 but is now atorgue (kernel. PCF8574 can be used as a port extender, to which we will connect LCD. This library allows you to communicate with I2C and Two Wire Interface devices, and control each step of any I2C transaction. I'm working with EasyMX PRO v7 STM32 and trying to communicate with the EEPROM on it. Another problem is that you try to set CR2 using CR1 bit definitions. A lot of DSP is frame based where the ADC gets a set of data a frame at a time using DMA. For exemple if I just need to generate a write condition bit may I use it even if txbuffer is a uint8 type? #sensor #i2c #i2c #hal Important : I²C library routines require you to specify the module you want to use. I am trying to get I2C (with interrupts) on an F411RE to work. The LL library offering a fast light-weight expert-oriented layer which is closer to hardware than the Hardware Abstraction Layer (HAL) library. Using the u8glib on the STM32. If you search 4-wire SPI support, you can find it in the afiskon/stm32-ssd1306 fork. When thats working move on to interrupt. 40 This I2C tutorial shows you how the I2C protocol works at the physical bit level discussing single master mode (a single controlling device) which is the most common use for I2C in a small system. Driver API for I2C Bus Peripheral (Driver_I2C. h contain the GPIO configuration for the LCD. Also if you have many peripherals working with interrupts remember that you may run out of stack. your STM32 board from the Tools > Board menu first to be sure that the examples for that board's specific Wire library are Thermo 15 Click is a Click board™ equipped with the sensor IC, which can digitize temperature measurements between -55°C and +125°C so that the temperature measurement data can be processed by the host MCU. 24 , RL-ARM V3. After playing with some example retrieved from the Internet, I have decided to start playing with one of my I2C component, a RTC from Dallas, the DS1307. We cannot afford to lose code support for our libraries, time to move to newer library! STM32 Tutorial NUCLEO F103RB GPIO Pins I’m going to show you how to output I2C with the HAL library using a PCA-9685 16-channel 12-Bit LED driver. This course is divided into 3 parts. Trying to write value 0x98 into memory position 0x11. HL1606 LED Strip: Code to control HL1606-based LED strips: HL1606 LED Strip PWM In this STM32 SPI Example, we will use Arduino UNO as Slave and STM32F103C8 as Master with Two 16X2 LCD display attached to each other separately. The following sample code shows how to access the HTS221 humidity and temperature sensor and the LPS25H pressure sensor on a Raspberry Pi Sense HAT. STM32 LL Library. I2C LCD Backpack. STM32F4 has up to 3 I2Cs, every of them has (as always) at least 2 pins pack for each I2C. Currently this has only been tested with a Raspberry Pi 2. んでそれにならって書くとこんな感じ stm32. The I2C protocol support upto 127 devices per bus. We all know it's main parts - 2 wires, multiple slaves, sometimes multiple masters, up to 5MHz of speed. Few libraries from AVR will work as-is with the STM32 board. But it was soon solved. STM32 has more features than Arduino board. We have already use it providing a source code to use a 16×2 LCD with a STM32. It is well-conceived and easy to use. You can get the library files and from here. I have come across the U8glib which is a graphic library, quite popular among Arduino users. First of all, we need to initialize TWI (I2C): May 1, 2014 I2C or Inter-Integrated Circuit is a multimaster serial single ended bus. I want to use HAL_I2C_Master_Transmit and HAL_I2C_Master_Receive. My code is just like below. Same is with the enable bit - wrong register. A spinoff of the Wire. I2C is a two-wire protocol for communicating between devices. This library is written in C++0x, and addresses some issues I run into when I used other free peripheral C libraries. However, there was an issue regarding the screen controller. Software I²C Library. Multi-master mode is not supported. Today we will take a step forward and interface OLED display using I2C with STM32. I2C EEPROM Interfacing with STM32F4 Discovery. Parts: Breadboard and hookup wires Arduino (using a nano v3 5v 16mhz clone in this case) External power supply (regulated 5v) The OLE The DS3231 RTC module has its 90 degree pins straightened out, so the battery is facing up, and the pins are aligned to the I2C pins of the STM32. Well, a lot of libraries work fine. STM32 and their HAL library - Page 1 The two very obvious examples that comes to mind is implementing an i2c slave (as in, the stm32 acts as a slave). Possible Future Improvements in this Library. In this tutorial a 0. Pins used for each I2C are described in table below: ssd1306-stm32HAL. The effort . I2C Tutorial - Open drain connections. Since I need all my analog inputs and i2c is on the digital pins I need a way to get a cheap oled Browse the vast library of free Altium design content including components, templates and reference designs. 96 inch 4 pin white I2C OLED module with Arduino. After finishing the first part, you will be able to write codes for basic peripherals like Clock Control, GPIO, Interrupt, and DMA. I ported my old for F4 to HAL based libraries for F0/F4/F7 series. Coding I2C interface functions. This is convenient to maintain up to date the documentation but is not easy find the topics inside the documentation and to understand the way to use the library. I’ve been trying all week to find a working example of I2C communication between an Uno and a Trinket. I can't really make my master to send data into the bus. I2C should be reset before first use on many STM32 micros. 96 Inch I2C IIC Serial 128x64 OLED Module LCD Display 4 Pin Font Color White for Raspberry Pi Zero, Zero W, 3B, 3B+, STM32, Arduino, Beaglebone Black and any Microcontroller with IIC interface: Computers & Accessories keyestudio 1602 I2C module is a 16 character by 2 line LCD display with Blue background and White backlight. 96" i2c OLED display module to an arduino. MadeForSTM32™ is offered to members of the ST Partner Program who want to go one step further in our collaboration, with the overall objective of contributing to a high-quality STM32 ecosystem. SDA and SCL from the microcontroller and the VCC and GND. Interrupts are generated every time the I2C-peripheral is finished with an autonomous task, or when it Thread 14389: HiWhen I use I2C library without Keil RTX to communicate with I2CEEPROM the program works fine, but when I start the RTX the programstuck at:while(!Status) Status=I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED); // Test on EV6 and clear itSomebody know how to fix this?Ps: uVision3 V3. In our case, you don’t need external pull ups, because library uses internal in STM32F4. I2C backpack advantages. Unfortunately there has been no port for STM32 microcontrollers so I tried to do this. This platform includes the STM32 Cube Library , ensuring easy portability across STM32 portfolio, plus a consistent set of middleware components (RTOS, USB The first option we'll show is how to use the i2c interface on the backpack. STM32 has program to measure the distance so that user will receive actual distance(Up to 2M)with USART. The Soft I2C Library for AVR. A Build Template for the STM32 Processor. e. Usage. This definitions (in source code below) in lcd16x2. Download and install the Arduino IDE; Launch Arduino IDE. System Workbench for STM32 can be used to develop on any STM32 using any ST-LINK/V2 type of device via JTAG or SWD debug bus protocols. [STM32]: Making a custom i2c slave device using STM32F103 Jan 7, 2018 I2C is a serial protocol and its greatest advantage over other protocol is that it requires constant two wires irrespective of number of devices connected. STM32 Primer - Use the Standard Peripheral Library. A library for I2C LCD displays. org) until 4. MCCI Catena Arduino Platform: Arduino library for MCCI Catena 44xx, 45xx, 46xx and 48xx systems The Wire (I2C) library is part of the Arduino STM32 files download, as it is almost a core part of the Arduino suite of libraries The version of Wire that is currently used, is software / "big banged", and doesn't use the hardware I2C features of the STM32 As promised, today I am going to interface LCD to STM32 using an I2C device (PCF8574). 96] - Description Tiny 128×64 is a OLED Display based on SSD1306 Display controller chip. h) I 2 C (Inter-Integrated Circuit, referred to as I-squared-C, I-two-C, or IIC) is a multi-master serial single-ended bus and is mostly used on single boards, but can also connect to components which are linked via cable. LCD16x2 Library. ssd1306 library for stm32 using stm32-hal library's. May 13, 2017 13 May 2017 on stm32 i2c tutorial, stm32f0 i2c, stm32 i2c cubemx, stm32 In HAL library, there are several functions that provide us an easy  Dec 13, 2017 Hi, I am having troubles with multiple I2C libraries in one sketch on stm32f103. As I mentioned in the last section we need to do a bit more work to the infrastructure to make it more suitable for more realistic application development. c). Tutorial: Using the ARM CMSIS Library Posted on February 14, 2013 by Erich Styger One of the great advantage of using an ARM core as on my FRDM-KL25Z board is that I can leverage a lot of things from the community. I2C scanner is fairly simple, yet fast and effective way to find whatever device you put onto I2C bus. 96″ 128×64 oled display with black and blue colors. The I2C HAL driver can be used as follows: (#) Declare a I2C_HandleTypeDef handle structure, for example: I2C_HandleTypeDef hi2c; (#)Initialize the I2C low level resources by implement the HAL_I2C_MspInit() API: (##) Enable the I2Cx interface clock (##) I2C pins configuration (+++) Enable the clock for the I2C GPIOs class I2C – a two-wire serial protocol¶. h and lcd16x2. The mikroC PRO for ARM provides routines for implementing Software I²C communication. i2csoft. PCF8574 is used as an I2C extender. SH1106 i2c Library. This display uses the I2C protocol to communicate to the microcontroller. I dived into the HAL library code and found this tid bit static HAL_StatusTypeDef I2C_SlaveTransmit_TXE(I2C_HandleTypeDef *hi2c) { Description. The CP2102 USB module also has its pins straightened out, and component side is up. i2c library API docs, for the Dart programming language. Display Library for SPI e-paper panels from Dalian Good Display and boards from Waveshare. In general you can't expect a AVR library to work on the STM32. any chance you would make some code for I2C for OLED displays?. The HD44780 is a de-facto standard controller for display. The u8glib is a really nice library to use when you don't want to mess around with different diplay protocols or drawing routines. h; The configuration section lets you choose the I/O lines used for SDA and SCL. I2C is a two wire serial protocol that allows an I2C Master exchange data with an I2C Slave. GxEPD2: Arduino Display Library for SPI E-Paper displays from Dalian Good Display and Waveshare. Note: You can find Master mode soft I2C routines in the DS1307 RTC project. Unfortunately, the EEPROM library from ST is too complected for me to use, so I have to give up on using external EEPROM that my mouse had. It helps engineers identify third party solutions with the highest level of integration and quality for the STM32 microcontrollers' ecosystem. STM32 CUBE or more precisely CUBE-MX is a graphical tool that allows configuring the STM32 microcontrollers very easily and generate a complete C project for: IAR , KEIL , AC6 and ATOLLIC . The documentation file is generated in automatic by using DOXYGEN. How STM32 I2C HAL Library to Read HTU21D. I got stuck while building a I2C library. h) More Content. The STM32 maintainer Git repository was mcoquelin (kernel. We will connect our LCD to these 16 pins. When I was designing my current mouse, I added a external I2C interface EEPROM to save explored maze to prevent crash. Read rendered documentation, see the history of any file, and collaborate with contributors on projects across GitHub. 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 An AVR Atmega library for HD44780 based lcd connected through i2c This library implements a driver for HD44780 lcd connected through PCF8574 port expander. While still making the same LED flashing, in this section I'll: make the linker script more complete; use a startup file The default configuration file for STM32 is stm32_defconfig. Today I'm releasing a library that I developed for the STM32 microcontrollers (currently there is support for the F1, F2 and F4 families). You can increase the stack either in project->settings if If the I2C scanner finds the device, then its wired up OK So the issue is in the library, or your use of it. The display I will be using is a 0. Hi, I though I might point out that the SPI example has a race condition. I use the u8g2 library and most of the other code is STMCube  I2C tutorial. h file. Provide a device abstraction layer: CPAL library supports all STM32 device  Jan 7, 2018 I2C is a serial protocol and its greatest advantage over other protocol is I shall be using libopencm3 library but this code can be easily ported  HardWire. The I2C Device Library is a collection of uniform and well-documented classes to provide simple and intuitive interfaces to an ever-growing collection of I2C devices. The display is mounted on an easy to solder PCB. Its not serious in the example (worse case it will not report an IRQ), but if used as a template for smth more elaborate, the race condition may bite. You can see this display on the image above. Since a few month I played around with an Arduino board and some nice I2C components, then I was interested in programming Cortex M3 cpu, and I bought a STM32 discovery card. u8glib is officially deprecated and not developed anymore. The soft I2C library for AVR comes in two files. To download the code, go to I need to make my STM32F072 communicate with a HIH sensor through I2C. . The I2C driver generates call back events that are notified via the function  When I use I2C library without Keil RTX to communicate with I2C EEPROM the program works fine, but when I start the Im using the STM32 in the MCBSTR32. If you need a baud rate other than the default 100Kbps, then you can supply this on the command-line: gpio Подключение oled дисплея с контроллером SSD1306 к STM32 по I2C; ssd1306 library for stm32 using hal library; Driver for the SSD1306 and SH1106 based 128x64 pixel OLED display running on the Arduino/ESP8266 platform HAL_I2C_Master_Transmit(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout) が送信APIなのでそれを使って書いていく。 ここで注意するのがAddressをシフトして引数に入れることだ. So we are going to set it to 9600 baud and use as library usart. Reply. This library works with i2c. I added method to read single byte, multi bytes, write single byte, write multi bytes, write/read single byte from/to register which has 16-bit address size. Now is possible use some STM32 in the ARDUINO IDE. Here you can find tutorial about usage u8g2 library with stm32 MCU. Time moves on and author of this library released newer one, u8g2. The sensor is sponsored by Arduino library for the Flysky/Turnigy RC iBUS protocol - servo (receive) and sensors/telemetry (send) using hardware UART (AVR, ESP32 and STM32 architectures) KONNEKTING Device Library: A library that enables creating KNX devices powered by Arduino. Libraries. There are device tree (DTS) for stm32429i-eval, stm32746g-eval, stm32f429-disco, stm32f469-disco, stm32f746-disco, stm32f769-disco, stm32h743i-disco and stm32h743i-eval. The I2C problem on STM32 (can't generate a start) try to run some simple example from the ST library at least to check with the debugger the order of the I2C support for Linux. GitHub makes it easy to scale back on context switching. An output 3. stm32 i2c library

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