zephyr

History

Anas Nashif 9ab2a56751 cleanup: include/: move misc/printk.h to sys/printk.h move misc/printk.h to sys/printk.h and create a shim for backward-compatibility. No functional changes to the headers. A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES. Related to #16539 Signed-off-by: Anas Nashif <anas.nashif@intel.com>		2019-06-27 22:55:49 -04:00
..
src	cleanup: include/: move misc/printk.h to sys/printk.h	2019-06-27 22:55:49 -04:00
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