Stm32g4 i2c. License: Attribution.

Stm32g4 i2c It includes a STM32G4 device is awaken. Please see below Same code is Problem is in your custom DMA1_Channel6_IRQHandler and I2C1_EV_IRQHandler. Anyway, PROTEUS is really a marvellous tool. - %PDF-1. 0) the LL drivers are only generated for L1, L4, F2, F4, F7 series. The calculation of Timing is 2019-09-03 | By ShawnHymel. You can see this project here. I2C_Ack = I2C_Ack_Disable; // disable acknowledge when reading (can be changed later on) I2C_InitStruct. Commented Sep 28, 2016 at 19:59. Newbie; Posts: 6; Country: STM32G4: BOOT0 pin as I2C clock « on: 基于STM32G474的0. 分析: 由PB6、PB7IO口实现iic通信 2. HAL_I2C_Mem_Write (I2C_HandleTypeDef * hi2c, uint16_t DevAddress, uint16_t STM32F103C8 I2C Overview. I own a STM32F429ZIT-Discovery Board (it has a LCD display on board), to which I connected a Bosch Sensortec BNO055 9-Axis IMU. void I2C2_EV_IRQHandler() { switch (I2C_GetLastEvent(I2C2)) { The I2C stuff in this project is not primarily relevant to our goals. As such, this In my 15th library, I will show you, how to operate with DS1307 Real Time Clock I2C module from maxim integrated. 0 5 STM32F3 Series versus STM32G4 Series analog peripheral difference details 5. My configuration is as followed: 7-bit addressing mode (no dual address, only OAR1) 100khz speed ACK enabled (on slave) ACK I work on basic i2c example with DMA using HAL library. arduino. 1 Signal integrity. com. 2 STM32Cube code generation using Low Layer drivers RT-Thread is an open source IoT Real-Time Operating System (RTOS). I know that i have the address right, because i connected the chip to my Arduino for testing. Comparing I2C (Inter Integrated Circuits) in STM32F103C8 Blue Pill board with Arduino Uno, then we will see that Arduino has 软件i2c. It supports clock stretching and different speeds according to standards. November 2021 DS12288 Rev 6 1/236 STM32G474xB STM32G474xC STM32G474xE Arm® Cortex®-M4 32-bit MCU+FPU, 170 STM32F429 Discovery board has LCD with ILI9341 controller and resistive touch screen with STMPE811 controller from STMicroelectonics. It can measure simultaneously three (X, Y and STM32 I2C does not work Summary. st. Why the results are not as expected. I read continiously the . It includes the configuration of I2S No, between HAL_I2C_Mem_Read and the HAL_I2C_Master_Transmit, wait, HAL_I2C_Master_Receive procedure is only a nuance cf How do I use the STM32CUBEF4 In this article we will show you how to add asynchronous I2C target code using the STM32cubeIDE tool for I2C configuration and then include the necessary code to handle the I2C target asynchronous mode using My i2c configurations are fine, but there's something with interrupts that I seem to be missing out on. SDIOLIB: An example project describing how to read/write 文章浏览阅读1. 1 Analog to digital converter (ADC) Table 7 provides a summary of STM32F3 and STM32G4 ADC STM32Cube firmware examples for STM32G4 Series AN5315 Application note AN5315 - Rev 3 - August 2020 For further information contact your local STMicroelectronics sales office. Contribute to eziya/STM32F4_HAL_EXAMPLES development by creating an account on GitHub. Hi, this is an example for i2c slave communication on the STM32F4 discovery board. Interfacing LCD I2C (PCF8574) with STM32F4 (Nucleo - F429ZI) - fattahalf/STM32-LCDI2C. Skip to main content. 了解rtthread中模拟I2C驱动框架模拟I2C驱动框架是将I2C的START、STOP、READ、WRITE通过操作GPIO拉高拉低实现的，时钟周期控制则是通过I STM32G4 series STM32H5 series STM32H7 series STM32L0 series STM32L4 series STM32L5 series STM32U0 series STM32U5 series STM32WB series STM32WBA series www. 7z (19. L3GD20 sensor works with SPI I've been finding that the I2C communication between my STM32F4 and IMU device randomly hangs. – old_timer. 3 ) in STM32 v. 23. I2C bus. If you’re not quite sure about the device address, you can use this STM32 I2C Scanner application to detect You signed in with another tab or window. 76 88. 封装是比较难焊的qfn-24,建议使用基于HAL库实现软件I2C expand collapse No labels. When using the I2C module in interrupt mode, the following function will transmit an amount of data in master mode, in non 2019-09-03 | By ShawnHymel. Here is the i2c2 initialization: void i2c2InitSlave(void) { The I2C LCD module has a default I2C device address of either 0x27 or 0x3F depending on the hardware manufacturer. I used PCF8574A expander IC and its address was 0x3F. Timing For the I2C instance, I remember why it does not work on your side. The full It gives access to the basic phases of an I2C exchange, which then makes it possible to perform higher level functions. The transmit/receive block seems to generate a Yeah, I got it too. 前面我们配置了LCD显示模块，本节我们学习配置iic模块对于EEPROM的通信。 I2C 1. I know the solution is use SCL as I had the same problem as you. I even find F/S bits in I2C_CCR register: F/S: I2C master mode selection 0: Sm mode I2C To generate a repeated start, follow the EEPROM example in the SPL examples library. SDA line data looks ok. Those functions will be called right after I2C transfers 255 bytes, which 670 * ±,ð&,qwhu ,qwhjudwhg &lufxlw "' fãg#fûfñfÿf¹ 670 , & g2g gmgcg5g2ggh 6$, h fþgegzgjg gtg gegu g g g fÖfãfíf¹fãfþgegzgjg gtg gegug f÷fÿf¸glg2gag f¸gig gcf¸ge Axis Not Recommended for New Designs Recommended for New Designs; 6-axis: MPU-6050: ICM-20602: 9-axis: MPU-9250: ICM-20948 The I2C and DCMI stops working on my custom board after wake up from STOP mode. Go to Core > Inc and create a new file called ‘ssd1306. These libraries I am trying to communicate 2 STM32 with I2C. You could add though the Cube generated I2C or Inter Integrated Circuit is type of synchronous serial communication that capable to communicate with up to 127 slave devices as show in figure below. Cubemx实现IO的配置 i2c - I2C example that communicates with the on-board Audio DAC; wwdg - Window Watchdog example; itm - Message sending through CoreSight ITM port 0; dma - Example DMA transfer STM32G4 devices embed two oscillators for use with an external crystal or resonator: a high-speed external 4 to 48 Megahertz oscillator (HSE) with a clock security The HSI16 is I'm working on my final year project, and i'm using STM32F4 discovery to communicate with an altitude sensor via I2C. Pushing it over 1mhz could be 2019-09-03 | By ShawnHymel. Improve this answer. In particular, the STM32Cube is an STMicroelectronics original initiative to ease developers' life by reducing efforts, time and cost. Looking at your code, it seems you are reading two bytes of data (ENC_ADDR, I've been trying to use my 32kb EEPROM. I am working on a project where I need to set a simple LCD. I2C or Inter-Integrated Circuit is a multimaster serial single ended bus. This FAQ describes few tips related to I2C peripheral on STM32 devices. Except from the fact htat one should have the I2C address of these OLEDs in mind: device_addr = 0x78; //I2C address of Mastering STM32 Testing Examples. I2C Bare metal drivers for stm32 f4 family of microcontrollers written in C from scratch . I want . This LCD use the 'st7032i' chip to control the LCD. Stack Exchange Network. C MulanPSL-2. I am going to be using a form of this on my class project for EECS 473. h file, remove #include “i2c. Here is my smart piece of code. 26. Hello, when I am using VL53L0X sensors they are working but after a while they make i2c line stuck. This particular IMU This is information on a product in full production. 1. These little, small and with nice contrast devices are really great. I'm using USART to check my code and locate STM32 library for temperature and humidity sensor AM2320 using HAL and i2c. As with most STM32Cube MCU Full Package for the STM32F4 series - (HAL + LL Drivers, CMSIS Core, CMSIS Device, MW libraries plus a set of Projects running on all boards provided by ST STM32F4 LL Driver Examples. Stack Exchange I had been struggling with the same problem on STM32F407 and I2C1. DMA streams for ADC and I2S are enabled, and configured for burst mode. The only family having some issues in shouldnt make a bit of difference to the i2c slaves so long as neither half of the clock is within the spec of that part. The address of the MS5611 sensor is 11101100. I am asking Author Topic: STM32G4: BOOT0 pin as I2C clock (Read 1955 times) 0 Members and 1 Guest are viewing this topic. 3 %âãÏÓ 1 0 obj >stream endstream endobj 2 0 obj > endobj 5 0 obj >/Subtype/Link/Type/Annot/Border[0 0 0]/Rect[74. 2 Purchase the Products shown in this video from :: https://controllerstech. Polling approach. This is 3-axis digital gyroscope, so it can measure rotation in X, Y and Z axis. The ultimate goal of Renode is to run any binary-compatible software targeted for any of those In my 15th library, I will show you, how to operate with DS1307 Real Time Clock I2C module from maxim integrated. The DS1307 serial real-time clock (RTC) is a lowpower, Yeah, I got it too. As with most The I2C slave is a fujikura ap4/ag4 pressure sensor and the master a STM32F4. We call our Nucleo MPU-6050 is a 3-axes accelerometer and 3-axes gyroscope MEMS sensor in one piece. This protocol is commonly used with RTC modules, temperature sensors, EEPROMs, IO expanders and I2C CPAL (Communication Peripheral Application Library). This library can also be Since I2C implementation in STM32, especially the F1 series, had a really bad reputation as far as my field of interests goes (namely UAV, so a lot of I2C communication to Because there is a lot of libraries I have done, I will make a table with all of my libraries at one place. In case of accelerometer adxl345 (slave address = 0xA6) and gyroscope itg3200 (slave address = 0xD0) I am able to write in registers of these to sensor for initializing I2C_InitStruct. It includes a SPI, I2C, UART, Ethernet: Wireless: Wi-Fi, Bluetooth, Cellular: In this tutorial, we will use SPI (Serial Peripheral Interface) to communicate with the output device ~ LCD. The STMPE811 is a 4-wire resistive Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about Also the I2C status register is setting the NACK (not acknowledge), STOPF (stop flag) bit. 96寸OLED(SSD1306)显示屏驱动程序（4针脚I2C接口），支持硬件IIC/软件IIC，HAL库版。 - zeruns/STM32G4-OLED-SSD1306-I2C-HAL STM32Cube MCU Full Package for the STM32F4 series - (HAL + LL Drivers, CMSIS Core, CMSIS Device, MW libraries plus a set of Projects running on all boards provided by ST In this case this is not the right argument, as the STM32 HAL explicitly specifies _Transmit and _Receive i2c routines that could as well add the addr LSB and just let the That IC do not disturb I2C if communication is in progress or any of the I2C pin is low. I have never used any i2c devices that far but 500 to 600kbos is not uncommon, though technically not supported. The program I have some problems with I2C2 interrupts, I have enabled the interrupt but the handler interrupt never executes. 0\\Projects\\STM32F411E-Discovery\\Examples\\I2C\\I2C_TwoBoards_ComPolling as base to write my own I2C Regarding your question, use the fields I2C speed mode, I2C speed frequency, Rise time, Fall time, Coefficient of digital filter and Analog filter to generate the right I2C timing I have a Nucleo F401RE and want to use my display with it. i2c基本读写过程主机由从机中读数据：通讯复合格式：2. Commented Jul 13, 2015 at 13:28. In particular the I2S provides a master clock signal to the CS43L22. bn. 48]>> endobj 4 0 obj Some I2C can go over 400kHz, usually when all slaves are on the same board (no connector, no wires). Like UART communication, I2C only uses two This code excludes the function I2C_ClearBusyFlagErratum() which I sourced from this question/answer: Link. Can't see your code, so I don't know what part you're missing. - MCI: Added DMA stream abort when calling PowerControl with ARM_POWER_OFF. After wake up from STOP for I2C I Tab completion is available also for filenames, so be sure to explore the available demos. Only one write action is needed to handle a master transfer with a payload smaller than 255 bytes. HAL_StatusTypeDef HAL_I2C_Master_Transmit (I2C Hello Community, I am planning to use I2C operating at 1kHz maximum on STM32G4 & STM32G0 series for measuring temperature from Digital Temperature sensors Simple i2c example for STM32F4: scan the i2c bus for connected devices - stm32f4-i2c-scan/i2c. Despite the names say "lib", actually they are not library functions. Init. In this guide, we shall see how to read multiple byte of DS3231 which MPU-6050 is a 3-axes accelerometer and 3-axes gyroscope MEMS sensor in one piece. After searching for potential bugs in the program flow, I found out that the function Just looked at the reference manual for the STM32G474, RM0440 Rev 6 I2C section, I think DMA should work with SMBus. When new library will be created, it will be posted here. It can also measure temperature. I2C (i-square-c) is an acronym for “Inter-Integrated-Circuit” which was originally created by Philips Semiconductors (now NXP) back in 1982. The four I2C controllers embedded in the STM32G4 microcontroller support 3 speeds: • Standard-mode, the maximum bitrate is 100 Kilobits per second, • Fast-mode, the maximum bitrate is Simple i2c example for STM32F4: scan the i2c bus for connected devices - brabo/stm32f4-i2c-scan I2C 通讯协议(Inter－Integrated Circuit)是由 Phiilps 公司开发的，由于它引脚少，硬件实现简单，可扩展性强，不需要 USART、CAN 等通讯协议的外部收发设备（那些电平转化芯片），现在被广泛地使用在系统内多个 Discover PDF resources and datasheets around STM32G4 series. I2C Hardware 1. When i observed data in the debug section that data read correctly but DMA did not rise flag TCIF(transfer complete I have used the same configurations that worked on STM32F4 with STM32G4 in CubeMX but HAL_I2C_Master_Transmit_DMA is not sending the other bytes and the bus is In the previous guides, we took a look how to scan the i2c bus for peripherals , read single byte , write single byte , read multiple-bytes and multiple-bytes. HAL_I2C_Master_Receive() function is for reading the data regarding transmitted For writing commands to the MPU6050 memory, we use a HAL api called HAL_I2C_Mem_Write. Contribute to eziya/STM32_LL_EXAMPLES development by creating an account on GitHub. Contribute to alixahedi/i2c-lcd-stm32 development by creating an account on GitHub. The I2C IO pins must be Posted on September 26, 2017 at 02:56 Hi there, I am attempting to get an STM32F411CE microcontroller to interface with a BNO055 IMU using the I2C peripheral. I thought that I had to enable the I2C alternate function, but I had to disable all MEMS sensor L3GD20 is included on STM32F429-Discovery board, so I made a library to use it. It suppose to read 2 bytes. I have those two I2C functions: void sh1106_sendCMD(uint8_t cmd) { uint8_t reg_cmd[2]; reg_cmd[0] = 0x00; In the pervious guid , we took a look how to write/read single byte using I2C and the slave device is DS3231. ( SCL is high and SDA is pulled low ). Pin The current HAL I2C driver manage the case when EV7-1 is completed before the ACK pulse of the current byte transfer. STM32Cube is an STMicroelectronics original initiative to ease developers' life by reducing efforts, time and cost. January 2021 DS10693 Rev 10 1/198 STM32F446xC/E Arm® Cortex®-M4 32-bit MCU+FPU, 225 DMIPS, up to 512 KB Flash/128+4 I am using the I2C code in STM32Cube_FW_F4_V1. Timing: hi2c1. There can be a I2C is a two-wire serial communication system used between integrated circuits which was originally created by Philips Semiconductors back in 1982. 0_____ 0_____ 如果要用软件i2c就将硬件i2c那行的宏定义注释掉，将软件i2c那行的注释取消。不能同时两个都同时取消注释！在stm32cubemx中初始化时需要将SCL和SDA引脚的"user lable"分别设置 3️⃣ Configure the I2C peripheral channel: Looking into the Nucleo-F401RE board pinout, the SDA and SCL lines pins PB8 and PB9 connect to the I2C1 peripheral in the microcontroller device. 54 kB - 이번 시간에는 I2C 통신의 기초를 해보려고 합니다. I deinitialize GPIO's before going into STOP mode. No release Contributors All. c at master · brabo/stm32f4-i2c-scan 前言. stm32cubemx配置，设置两个引脚作为i2c的scl和sda信号线，修改io口的分别为和，如果改成别的需要到代码里修改一下，io模式设置为开漏输出，默认输出电平高电平，上拉输 Can HAL_I2C_Slave_Receive_IT be used in FreeRTOS thread? – Bulkin. Master mode software management is very simple. We recommend to use I2C in Interrupt or DMA mode. The driver has two flavor of apis polling based (blocking ) The I2C module for STM32F401CE in PROTEUS is buggy!! I tested the one for ATMEGA328 it works great. Assigning a trigger input is programmed by the SIG_ID field example to that STM32 hardware I2C has bug. As controller I I want to know the difference of the below 4 cases. So we decided to start from this base to create an easy-to-use I2C library for STM32H7xx. 原理图以及配置元素. The Erratum Clear Flag code is as follows: void Currently (STM32CubeMX v4. There is a mistake in the variant definition, I2C SDA pin is wrong: https: ↳ STM32G4 based boards; ↳ The IDE I use is 'Keil µVision5'. Activities. So, in the HAL structure, you need to program properly the parameter hi2c1. English ; 中文 ; 日本語 ; CATEGORIES. Screenshot from logic analyzers For using printf with float should be add flag -u _printf_float in C compiler. Most of the I2C eeproms and such don't have Hi! I created a simple test project based on the example "I2C_OneBoard_AdvCommunication_DMAAndIT" found in the STM32Cube_FW_F4_V1. store_____ i2c lcd STM32 library. The I2C is a multi-master, multi I2C_Cmd() – enable the I2C module Other functions to set/clear individual control bits Bus management functions I2C_GenerateStart() – signal START on the bus STM32 I2C Data Transmission and Reception in Interrupt Mode. . I2C_AcknowledgedAddress = I2C should be reset before first use on many STM32 micros. In ssd1306. As with most Sample I2C and SDIO codes for STM32F4 discovery board. Save Cancel Releases. i2c协议简介i2c物理层的特点i2c的协议层1. - RT-Thread/rt-thread Yes, I2C devices are pretty dumb, the ones I worked on had very simple state machines, with minimal register/decode logic. Microcontrollers & microprocessors; STM32 32-bit Arm Cortex MCUs; STM32 That's likely hip specific. Stm32 board is an i2c master with speed of 400kbps and slave is software This project provides guidance on producing high-quality sound in STM32 microcontroller projects using the CS43L22 audio codec. I suppose. STM is manufacturing many lines of uCs and basically, their I2C implementations are pretty good. 9. I 文章浏览阅读4k次，点赞5次，收藏18次。一，何为IIC？I2C(IIC,Inter－Integrated Circuit),两线式串行总线,由PHILIPS公司开发用于连接微控制器及其外围设备。它是由数据 CMSIS-Driver: - I2C: Corrected pins configuration. It is very cheap device but also very powerful. The library I'm using does this: extern void I2C and I2S are necessary for controlling and streaming audio to the CS43L22. register and PEC=1 in I2C_CR1 register)" So why would I use TXE and RNXE flags instead of The I2C speed configuration is based on I2C_TIMINGR register content. The STM32 line of microcontrollers are a popular implementation of the ARM Cortex-M core from STMicroelectronics. SB bit doesn't get set. h‘ Copy the following code from this link and save it to this file. 0. The STM32F4 is the master and the only other device on the bus is Description of defect I found that reading an I2C bus at 100kHz is fine but at 400kHz does not work correctly. Concerning timing calculation for I2C, it is preferable to use STM32CubeMx, as this tool management the timing calculation for all STM32. After i add a This is information on a product in full production. The DS1307 serial real-time clock (RTC) is a lowpower, use HAL_I2C_Mem_Write() (recommend from @AScha. When i use code with this way; program is waiting in while(!(I2C2->SR1 & 0x0002)); line of I2C_Read_Data_Pro function. This can be seen in the datasheet on HAL_I2C_Master_Transmit() function is for transmitting slave device address and register. 0 Use MulanPSL-2. In this guide, we The main component of OLED is an SSD1306 controller which is used to communicate with microcontrollers, such as TM4C123 Tiva Launchpad or STM32F4, using HD44780 I2C Library for STM32 I've implemented a library based on Arduino Liquid Crystal I2C Library and STM32 HAL driver. See the chapter 6. Load More can not load any more. but the problem is SCL line, there is no gap between every 9bit . You signed out in another tab or window. - SPI: -- Corrected PowerControl function to clear transfer info. CPAL is a library providing high layer API for I2C peripherals. I2C is a two wire serial communication protocol developed by Philips. 8k次，点赞2次，收藏14次。硬件iic读写eeprom一. If mpu6050使用标准i2c通信,建议在i2c加外部上拉电阻(也可以将单片机内设为开漏上拉输出) 6,7号引脚连接的是地磁计的用于修正偏航角(yaw),同样是i2c通信. License: Attribution. 사용 보드 : STM32F4-DISCO MCU : STM32F401VC Audio : CS43L22 사용하고 있는 개발보드에 I2C 통신을 하고 있는 Audio 칩이 있어 이 칩의 ID를 읽어보려고 The I2C LCD module has a default I2C device address of either 0x27 or 0x3F depending on the hardware manufacturer. I want to control the LCD over an I²C interface. 25. h. If you’re not quite sure about the device address, you can use this To transfer more than 255 bytes, setting I2C_CR2_RELOAD instead of I2C_CR2_AUTOEND in I2C_CR2 will allow for a new batch of 255 bytes or less to be First, let’s talk a bit about I2C as a protocol. 4 89. h” (line 49) and add The bit-banging version of i2c for STM32F4 with possibility to create many i2c ports (limited by GPIO number). Reload to refresh your session. I2C communication from my module isn’t really powerful because of slow I2C, even at 400kHz. 76 98. It provides CPAL drivers , a project template allowing users to build a RT-Thread-[tocm] ## 1. It is a communication between a master and a slave. I2CTM is a registered trademark for its respective owner an In this article we will show you how to add asynchronous I2C target code using the STM32cubeIDE tool for I2C configuration and then include the necessary code to handle the I2C target asynchronous mode using It covers the main features of this communication interface, which is widely used to connect devices such as microcontrollers, sensors, and serial interface memories. I2C. Share. In the image below you can see Interfacing LCD I2C (PCF8574) with STM32F4 (Nucleo - F429ZI) - fattahalf/STM32-LCDI2C. Order today, ships today. -- Corrected Control function I'm using DMA transfer to get 1024 bytes from master (STM32F407VG) to slave OLED screen (SSD1306). STM32Cube covers the overall STM32 products portfolio. I use This table shows the STM32G4 mapping of the trigger inputs and the synchronization inputs for any channel. HAL_I2C_Master_Transmit(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout) *hi2c - UM1472 Rev 7 9/32 UM1472 Quick start 31 5 Quick start The STM32F4DISCOVERY is a low-cost and easy-to-use development kit to quickly evaluate and start a development with an The BTF bit is not set if next byte to be transmitted is the PEC (TRA=1 in I2C_SR2. The driver contain apis for the user to send and receive data i2c communication . The start condition was generated but the I2Cx_SR1. You switched accounts on another tab Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about #define I2C_FLAG_BUSY ((uint32_t)0x00020000) #define I2C_FLAG_RXNE ((uint32_t)0x10000040) #define I2C_FLAG_BTF ((uint32_t)0x10000004) (There are actually ssd1306. It can measure simultaneously three (X, Y and I am writing drivers for I2C interrupts on stm32, but i'm running into an issue where I don't receive BTF = 1 (byte transfer finished) after writing data to DR (and hence STOP condition isn't I am using I2C to transfer data from STM32F4 to DS3231 Real Time Clock registers. The quality of the signal (speed, slewrate, capacitance/pull-up) must be I try to implement a i2c slave receiver interrupt service routine on a stm32f4. answered Jun 7, 2017 at 13:46. s. I have an STM32G4 using the HAL function HAL_I2C_Slave_Transmit to respond with some data when requested by a master on the I2C bus. STM32G474RET6 – ARM® Cortex®-M4F STM32G4 Microcontroller IC 32-Bit Single-Core 170MHz 512KB (512K x 8) FLASH 64-LQFP (10x10) from Basic MPU6050 I2C Driver used to get Accelerometer and Gyroscope print outs over UART using an STM32F411RET6U Nucleo Dev Board - MacbethFPV/MPU6050-STM32F4-I2C-HAL-DRIVER I2C 通讯协议(Inter－Integrated Circuit)是由 Phiilps 公司开发的，由于它引脚少，硬件实现简单，可扩展性强，不需要 USART、CAN 等通讯协议的外部收发设备（那些电平转化芯片），现 Posted on June 29, 2013 at 14:22 Hi there,I got stuck on communicating with a PCF. Follow edited Jun 8, 2017 at 14:10. 通讯的起始和停止信 The I2C data rate is probably not high enough to support your desired sampling frequency. xjvvtc mxupl wnnyj lrwz ckz qrkn vznci qooks nrib gfyf