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September 13-16, 2022
Dublin, Ireland + Virtual
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Wednesday, September 14 • 12:10 - 12:50
Basics of I2C on Linux - Luca Ceresoli, Bootlin

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This talk is an introduction to using I²C on embedded Linux devices. I²C (or I2C) is a simple but flexible electronic bus to allow low-speed communication between the CPU and all sorts of chips: PMICs, ADC/DACs, GPIO expanders, video sensors, audio codecs, EEPROMS, RTCs and many more. It is so popular that knowing it is a must for any embedded system engineer. Luca will first give an introduction to what I2C is at the electrical level. He will then describe how I2C is implemented in the Linux kernel driver model and how that appears in sysfs, how to describe I2C devices using device tree and how to write a driver for an I2C device. Finally he will present the tools to communicate with the chips from userspace and share some debugging techniques, including inspection of the physical bus and software-level debugging.
Speakers
avatar for Luca Ceresoli

Luca Ceresoli

Embedded Linux and kernel engineer, Bootlin
Luca joined Bootlin in 2022 as an embedded Linux engineer. He gave several contributions to the Linux kernel, including the implementation of some I2C chips and improvements to the I2C documentation. He designed several embedded Linux products from the ground up, mostly hacking around... Read More →

ceresoli basics of i2c on linux pdf
Wednesday September 14, 2022 12:10 - 12:50 IST
Liffey Hall 1 (Level 1)
  Embedded Linux Conference (ELC), Linux in Devices, Embedded System Architecture, Debugging, Device drivers