zephyr

History

Anas Nashif 3ae52624ff license: cleanup: add SPDX Apache-2.0 license identifier Update the files which contain no license information with the 'Apache-2.0' SPDX license identifier. Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of Zephyr, which is Apache version 2. Signed-off-by: Anas Nashif <anas.nashif@intel.com>		2019-04-07 08:45:22 -04:00
..
src	all: Add 'U' suffix when using unsigned variables	2019-03-28 17:15:58 -05:00
CMakeLists.txt	license: cleanup: add SPDX Apache-2.0 license identifier	2019-04-07 08:45:22 -04:00
README.rst	samples: driver: i2c scanner	2018-12-21 10:27:53 +01:00
overlay-nrf52.conf	samples: driver: i2c scanner	2018-12-21 10:27:53 +01:00
prj.conf	samples: driver: i2c scanner	2018-12-21 10:27:53 +01:00
sample.yaml	samples: add test identifier	2019-03-29 17:44:11 -04:00

README.rst

.. _i2c_scanner:

I2C Scanner sample
##################

Overview
********
This sample sends I2C messages without any data (i.e. stop condition
after sending just the address). If there is an ACK for the
address, it prints the address as ``FOUND``.

.. warning:: As  there  is  no  standard I2C detection command, this sample
   uses arbitrary SMBus commands (namely SMBus quick write and SMBus
   receive byte) to probe for devices.  This sample program can confuse
   your I2C bus, cause data loss, and is known to corrupt
   the Atmel AT24RF08 EEPROM found on many IBM Thinkpad laptops.
   See also the `i2cdetect man page
   <http://manpages.ubuntu.com/manpages/bionic/man8/i2cdetect.8.html>`_

Building and Running
********************
.. zephyr-app-commands::
   :zephyr-app: samples/drivers/i2c_scanner
   :board: nrf52840_blip
   :conf: "prj.conf overlay-nrf52.conf"
   :goals: build flash