Setting up I2C on Xavier

ROVguy · August 6, 2019, 2:46am

Hello.
I have an I2C issues with Xavier. I’m having a hard time figuring out how to setup I2C(bus 8) using C++. Currently I am using rosserial to publish/subscribe with an Arduino (master) and it then communicates bidirectionally with slave controllers over I2C. I’d like to get rid of the master now that I have moved to the Xavier but I can’t find anything only that is easy to understand and implement with regards to I2C using C++ and the Xavier.

At a minimum I’m hoping I could get help setting up the bare bones for I2C communication sending a 7 digit number (1100000-1991023) to a single slave controller 0x12. The 7digit value is coming from a ros subscription.
Thanks.

ShaneCCC · August 12, 2019, 9:06am

Below may you need although it’s c code but should be no problem to integrate to for c++ project.

github.com

OnionIoT/wiki/blob/master/Documentation/Libraries/I2C-C-Library.md

# I2C C Library

The Onion I2C Library, `libonioni2c` is a dynamic C library that provides functions to easily read from and write to devices communicating with the Omega via I2C. The library can be used in C and C++ programs.

Also available is a Python module that implements an I2C object using functions from the C library. The module is called `onionI2C` and is part of the `OmegaExpansion` package.


[[_TOC_]]


[//]: # (Linux and I2C)

# Linux and I2C

I2C devices are usually controlled by a kernel driver, however, it is also possible to access devices through an adapter in the Linux filesystem. The adapter can be found at `/dev/i2c-X`, where `X` is the adapter number which can range from 0 to 255. On the Omega, `/dev/i2c-0` is available by default. This allows users to interact with I2C slaves from the Linux environment.

The Onion I2C library uses the `/dev/i2c-0` adapter, and implements read and write functions I2C devices.

This file has been truncated. show original

ROVguy · August 13, 2019, 2:08am

@ ShaneCCC
Thanks for the suggestion. Today I got something working that came from here [url]https://github.com/amaork/libi2c[/url].

In case there is another one of me with I2C issues I will add my changes soon.

Topic		Replies	Views
I2C adress Jetson AGX Xavier developer kit? Jetson AGX Xavier i2c	8	854	January 4, 2023
I2C can send data but can't receive data Jetson AGX Xavier	5	653	October 18, 2021
AGX xavier set i2c bus to slave mode Jetson AGX Xavier i2c	2	470	July 22, 2022
how to use i2c-8 on Xavier's Expansion Header? Jetson AGX Xavier	3	670	October 18, 2021
Xavier NX,About I2C Jetson Xavier NX i2c	10	1153	August 11, 2023
AGX Xavier how to set the i2c@c240000 as a i2c slave mode [2] Jetson AGX Xavier i2c	3	1190	December 24, 2021
Xavier i2c I2C_M_REV_DIR_ADDR Jetson AGX Xavier i2c	7	1393	October 18, 2021
I2C Slave Jetson Nano i2c	11	1655	October 15, 2021
How can I use NX(I2C master) to communicate with STM32(I2C slaver)? Jetson Xavier NX i2c	4	901	March 9, 2022
How to use I2C bus in my c++ code? Jetson Nano	5	11701	October 14, 2021

Setting up I2C on Xavier

Related topics