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zephyr/samples/subsys/logging/logger
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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 samples: Add 'U' to unsigned variable assignments 2018-12-04 22:51:56 -05:00
CMakeLists.txt license: cleanup: add SPDX Apache-2.0 license identifier 2019-04-07 08:45:22 -04:00
Kconfig Kconfig: Remove redundant $(ZEPHYR_BASE) from 'source's 2018-10-10 11:28:27 -05:00
prj_rtt.conf sample: subsys: logging: Ensure that logger RTT backend is tested 2019-03-28 08:41:28 -05:00
prj.conf tests: Dont run coverage for select test cases. 2019-01-16 06:12:33 -05:00
README.rst samples: subsys: logging: Add logger example 2018-06-29 10:16:45 +02:00
sample.yaml samples: add test identifier 2019-03-29 17:44:11 -04:00

README.rst 

.. _logger_sample:

Logging
###########

Overview
********
A simple application that demonstrates use of logging subsystem. It demonstrates
main features: severity levels, timestamping, module level filtering and
instance level filtering. It also showcases logging capabilities in terms of
performance.

Building and Running
********************

This project outputs multiple log message to the console.  It can be built and
executed on QEMU as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/subsys/logging/logger
   :host-os: unix
   :board: qemu_x86
   :goals: run
   :compact:


Sample Output
=============

.. code-block:: console

         Module logging showcase.
         [00:00:00.000,122] <info> foo: log in test_module 11
         Disabling logging in the foo module
         Function called again but with logging disabled.
         Instance level logging showcase.
         [00:00:00.000,274] <info> sample_instance.inst1: counter_value: 0
         [00:00:00.000,274] <warn> sample_instance.inst1: Example of hexdump:
         [00:00:00.000,305] <warn> sample_instance.inst1:  01 02 03 04            |....
         [00:00:00.000,305] <info> sample_instance.inst2: counter_value: 0
         [00:00:00.000,305] <warn> sample_instance.inst2: Example of hexdump:
         [00:00:00.000,305] <warn> sample_instance.inst2:  01 02 03 04            |....
         Changing filter to warning on sample_instance.inst1 instance.
         [00:00:00.000,396] <warn> sample_instance.inst1: Example of hexdump:
         [00:00:00.000,427] <warn> sample_instance.inst1:  01 02 03 04            |....
         [00:00:00.000,427] <info> sample_instance.inst2: counter_value: 1
         [00:00:00.000,427] <warn> sample_instance.inst2: Example of hexdump:
         [00:00:00.000,427] <warn> sample_instance.inst2:  01 02 03 04            |....
         Disabling logging on both instances.
         Function call on both instances with logging disabled.
         Severity levels showcase.
         [00:00:00.000,610] <err> main: Error message example.
         [00:00:00.000,610] <warn> main: Warning message example.
         [00:00:00.000,610] <info> main: Info message example.
         Logging performance showcase.
         [00:00:00.134,887] <info> main: performance test - log message 0
         [00:00:00.134,887] <info> main: performance test - log message 1
         [00:00:00.134,887] <info> main: performance test - log message 2
         [00:00:00.134,887] <info> main: performance test - log message 3
         [00:00:00.134,887] <info> main: performance test - log message 4
         [00:00:00.134,887] <info> main: performance test - log message 5
         [00:00:00.134,887] <info> main: performance test - log message 6
         [00:00:00.134,918] <info> main: performance test - log message 7
         [00:00:00.134,918] <info> main: performance test - log message 8
         [00:00:00.134,918] <info> main: performance test - log message 9
         [00:00:00.134,918] <info> main: performance test - log message 10
         [00:00:00.134,918] <info> main: performance test - log message 11
         [00:00:00.134,918] <info> main: performance test - log message 12
         [00:00:00.134,918] <info> main: performance test - log message 13
         [00:00:00.134,948] <info> main: performance test - log message 14
         Estimated logging capabilities: 245760 messages/second