Smbus Library

• Has ANYONE found any better documentation on smbus than that erazer wiki site? The page there is from 2006, and is very rudimentary. I'm trying to figure out, for instance, what the parameters for the commands are (esp. The 'cmd' parameter). The pydoc site is even more useless, as it has nothing on smbus.
• Earlier today I started installing ubuntu 13.04 on my virtualbox and the following error popped up! 'piix4smbus 0000:00:07.0: SMBus base address.

• Micropython Smbus Library
• Raspberry Smbus Library
• Python I2c Smbus Library
• Smbus Library C
• Python Smbus Library

Driver download page for the ATI SMBus by Video.

Micropython Smbus Library

Released:

Raspberry Smbus Library

smbus2 is a drop-in replacement for smbus-cffi/smbus-python in pure Python

Project description

A drop-in replacement for smbus-cffi/smbus-python in pure Python

smbus2 is (yet another) pure Python implementation of of the python-smbus package.

It was designed from the ground up with two goals in mind:

1. It should be a drop-in replacement of smbus. The syntax shall be the same.
2. Use the inherent i2c structs and unions to a greater extent than other pure Python implementations like pysmbus does. By doing so, it will be more feature complete and easier to extend.

Currently supported features are:

• Get i2c capabilities (I2C_FUNCS)
• SMBus Packet Error Checking (PEC) support
• read_byte
• write_byte
• read_byte_data
• write_byte_data
• read_word_data
• write_word_data
• read_i2c_block_data
• write_i2c_block_data
• write_quick
• process_call
• read_block_data
• write_block_data
• block_process_call
• i2c_rdwr - combined write/read transactions with repeated start

It is developed on Python 2.7 but works without any modifications in Python 3.X too.

More information about updates and general changes are recorded in the change log.

smbus2 installs next to smbus as the package, so it's not really a 100% replacement. You must change the module name.

Example 1a: Read a byte

Example 1b: Read a byte using 'with'

This is the very same example but safer to use since the smbus will be closed automatically when exiting the with block.

Example 1c: Read a byte with PEC enabled

Same example with Packet Error Checking enabled.

Example 2: Read a block of data

You can read up to 32 bytes at once.

Example 3: Write a byte

Example 4: Write a block of data

It is possible to write 32 bytes at the time, but I have found that error-prone. Write less and add a delay in between if you run into trouble.

Starting with v0.2, the smbus2 library also has support for combined read and write transactions. i2c_rdwr is not really a SMBus feature but comes in handy when the master needs to:

1. read or write bulks of data larger than SMBus' 32 bytes limit.
2. write some data and then read from the slave with a repeated start and no stop bit between.

Each operation is represented by a i2c_msg message object.

Example 5: Single i2c_rdwr

Example 6: Dual i2c_rdwr

To perform dual operations just add more i2c_msg instances to the bus call:

Example 7: Access i2c_msg data

All data is contained in the i2c_msg instances. Here are some data access alternatives.

From PyPi with pip:

From conda-forge using conda:

Installation from source code is straight forward:

Python I2c Smbus Library

Release historyRelease notifications | RSS feed

0.4.1

0.4.0

0.3.0

0.2.3

0.2.2

0.2.1

0.2.0

0.1.5

0.1.4

0.1.3

0.1.2

0.1.1

0.1.0

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Smbus Library C

Hashes for smbus2-0.4.1-py2.py3-none-any.whl

Hashes for smbus2-0.4.1.tar.gz

Python Smbus Library