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Questions tagged [smbus]

SMBus (System Management Bus) provides a control bus for the system to pass the messages to/from devices instead of using an individual control lines, this control helps to reduce pin count and system wires.

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smBus communication testing for fan driver IC in STM32 with C

I developed a library for fan IC which use smbus protocol. However ı have some problems and questions. 1 -) what is diff between master and slave for smbus? whether the IC should be slave or master is not specified in the datasheet. Therefore, how…
Mete Bingöl
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SMBUS undefined reference

I'm trying to make simple program in c++ to read from SMBus, but can't even build program sample. I'm building with gcc(9.4.0) on Ubuntu 20.04.5 LTS. I've installed libi2c-dev i2c-tools Code: #include extern "C" { #include…
new_linux_explorer
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How to avoid getting invalid argument when controlling joystick with smbus library

I am trying to control a 5 pin joystick with raspberry pi the code is attached however when I run this I get an error does anyone know how to resolve this issue? I expected it to show me the position of the joystick when pushed i tried checking for…
Kumaran Panchakumar
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How to perform a 256 byte block read with i2c/smbus

I've got this power monitor that I'm attempting to interface with to retrieve it's fault log LTC2977 (data sheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ltc2977.pdf) I'm new to i2c / pmbus / smbus things so forgive my…
dazed_and_confused
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How can I get i2c values from a Rapsberry with Python?

I use an ads1115 to get values from an analogic sensor to a raspberry pi 3 but I'm having a hard time figuring out how to get them from python. I use the SMBus library to get the i2c values but I can't find how to actually get the analog 0 AIN0…
Erwan Bertrand
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ImportError: no module named 'smbus2'

I'm using Pymakr on VScode to program a Pycom L01, which is connected to several sensors. i'm trying to use smbus2 library, but i can't import it. I created a python virtual enviroment and installed it using 'pip install smbus2', but when i try to…
Lorenzo_inirapmoC
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Smbus-device emulation in QEMU

I want to emulate a SMBus/I2C device in QEMU. I see that there are existing modules in QEMU which have SMBus functionality, but I don't know how to create a new one or the command to use the existing one. Can somebody please help here.
nerd
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Issue in STM32CubeMx

While using STM32 CubeMX (version 5.2.1) and selecting the i2c in SMBus-two-wire-Interface it shows as follows:- Warnings: STM32 CubeMX does not support the configuration of this mode of this IP.However,this IP can be configured manually. Anyone…
Rohith R
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Raspberry Pi 4: Python3 smbus2 prepends 0x00 to all I2C data writes

I have working C & Python3 code, based upon simple examples from the internet, where I can correctly send data from my Raspberry Pi4 to an Atmel SAM-E70 dev kit board. I've got a logic analyzer connected to look at the data being sent, and for…
PfunnyGuy
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undefined reference to `i2c_smbus_read_block_data(int, unsigned char, unsigned char*)'

I'm trying to read a block of data from an imu (mpu9250) but when building with g++ mpu.cpp -o mpu i get the following error: /tmp/cckh5V8w.o: In function 'imu::read_accel()':…
Adam El Messaoudi
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Why might `i2c_smbus_write_byte_data` be returning "Operation not permitted" on uClinux 2.4?

I am writing a C program with the aim of configuring a peripheral device (the CS5368 ADC) via the I2C interface of a Dante Brooklyn II, a board based on a Microblaze soft-core processor running uClinux 2.4. I have implemented the configuration…
mindTree
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SMBus on PCIe Slot

I have some PCIe cards, which have some PMICs on SMBus. If I connect more than one (identical) PCIe cards on different slots(on an x86), would I be able too access all PMICs (with same address)? Does all the PCIe slots share the same SMBus lines,…
Vinu Chandran
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AMD X470 SMBus specification

I've reverse engineered a windows SMBus driver in order to port the code to a Linux system. In order to interact with the SMBus, the code uses hard coded port addresses based on the system chipset. In my case I'm using an AMD X470 with a base…
Twifty
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IOError: [Errno 121] Remote I/O error

I tried to connect the LCD display and display the text, but an error occurred. The LCD driver is OK, and the smbus and I2C tools are also installed correctly. But I wonder why it does not work. help. # demo_lcd.py # Simple string program. Writes…
sungjin.park
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Python pass input string which has spaces and use for smbus

My code for ic2 is. import argparse import smbus import time bus = smbus.SMBus(1) bus.write_byte_data(0x20, 0x00, 0x00) bus.write_byte_data(0x20, 0x01, 0x00) bus.write_byte_data(0x20, 0x14, 0x01) time.sleep(0.5) bus.write_byte_data(0x20,…
Chonlathit Wanpean
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