esp32-smbus

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ESP32-compatible C library for the SMBus protocol

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# esp32-smbus

## Introduction

This component provides a subset of the System Management Bus (SMBus) version 3.0 protocol, used to communicate with SMBus-compatible devices
over a 2-wire I2C bus. Only 7-bit I2C addresses are currently supported. SMBus PEC is not supported.
 
It is written and tested for the [ESP-IDF](https://github.com/espressif/esp-idf) environment, version 2.1, using the xtensa-esp32-elf toolchain (gcc version 5.2.0).

## Example

An example of this component in use can be found at [DavidAntliff/esp32-tsl2561-example](https://github.com/DavidAntliff/esp32-tsl2561-example)

## Features

Supports the following SMBus and I2C operations:

* Quick Command - send the R/W bit to the slave.
 * Send Byte - send a single byte value to the slave.
 * Receive Byte - receive a single byte value from the slave.
 * Write Byte - send a command code and byte to the slave.
 * Read Byte - receive a byte from the slave in response to a command code.
 * Write Word - send a command code and word (two bytes) to the slave.
 * Read Word - receive a word (two bytes) from the slave in response to a command code. A byte count is transferred.
 * SMBus Write Block - send a command code followed by a block of bytes to the slave. A byte count is transferred
 * SMBus Read Block - receive a block of bytes from the slave in response to a command code. No byte count is used.
 * I2C Write Block - send a command code followed by a block of bytes to the slave. No byte count is used.

In addition, the I2C timeout can be configured.

## Documentation

Automatically generated API documentation (doxygen) is available [here](https://davidantliff.github.io/esp32-smbus/index.html).

## Source Code

The source is available from [GitHub](https://www.github.com/DavidAntliff/esp32-smbus).

## License

The code in this project is licensed under the MIT license - see LICENSE for details.

## Links

* [System Management Bus (SMBus) Specification, version 3.0](http://www.smbus.org/specs/SMBus_3_0_20141220.pdf)
 * [I2C-bus Specification and User Manual](https://www.nxp.com/docs/en/user-guide/UM10204.pdf)
 
## Acknowledgements

* "I2C" is a registered trademark of Phillips Corporation.
 * "SMBus" is a trademark of Intel Corporation.

## Roadmap

The following features are anticipated but not yet implemented:

* 10-bit I2C addresses.
 * SMBus Packet Error Checking (PEC).
 * Support for Process Calls.
 * Support for Block-Write-Read Process Calls.

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