zephyr

History

Carlo Caione 6eb48088ed samples: logger: Fix test on stack hungry platforms This test is failing on platforms requiring a bigger stack size. This issue is fixed by adding the missing CONFIG_TEST_EXTRA_STACKSIZE to tweak the thread stack size. Signed-off-by: Carlo Caione <ccaione@baylibre.com>		2019-11-20 15:59:12 +01:00
..
src	samples: logger: Fix test on stack hungry platforms	2019-11-20 15:59:12 +01:00
CMakeLists.txt	license: cleanup: add SPDX Apache-2.0 license identifier	2019-04-07 08:45:22 -04:00
Kconfig	kconfig: Clean up header comments and make them consistent	2019-11-04 17:31:27 -05:00
README.rst	doc: add how to exit from QEMU in samples	2019-09-02 12:06:08 -04:00
prj.conf	tests: Dont run coverage for select test cases.	2019-01-16 06:12:33 -05:00
sample.yaml	x86: consolidate x86_64 architecture, SoC and boards	2019-10-25 17:57:55 -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.
        [00:00:00.106,051] <inf> sample_module: log in test_module 11
        [00:00:00.106,054] <inf> sample_module: Inline function.
        Disabling logging in the sample_module module
        Function called again but with logging disabled.
        Instance level logging showcase.
        [00:00:00.106,200] <inf> sample_instance.inst1: Inline call.
        [00:00:00.106,204] <inf> sample_instance.inst1: counter_value: 0
        [00:00:00.106,209] <wrn> sample_instance.inst1: Example of hexdump:
        01 02 03 04             |....
        [00:00:00.106,214] <inf> sample_instance.inst2: Inline call.
        [00:00:00.106,218] <inf> sample_instance.inst2: counter_value: 0
        [00:00:00.106,223] <wrn> sample_instance.inst2: Example of hexdump:
        01 02 03 04             |....
        Changing filter to warning on sample_instance.inst1 instance.
        [00:00:00.106,297] <wrn> sample_instance.inst1: Example of hexdump:
        01 02 03 04             |....
        [00:00:00.106,302] <inf> sample_instance.inst2: Inline call.
        [00:00:00.106,307] <inf> sample_instance.inst2: counter_value: 1
        [00:00:00.106,311] <wrn> sample_instance.inst2: Example of hexdump:
        01 02 03 04             |....
        Disabling logging on both instances.
        Function call on both instances with logging disabled.
        String logging showcase.
        [00:00:01.122,316] <inf> main: Logging transient string:transient_string
        Severity levels showcase.
        [00:00:01.122,348] <err> main: Error message example.
        [00:00:01.122,352] <wrn> main: Warning message example.
        [00:00:01.122,355] <inf> main: Info message example.
        Logging performance showcase.
        [00:00:02.151,602] <inf> main: performance test - log message 0
        Estimated logging capabilities: 42000000 messages/second
        Logs from external logging system showcase.
        [00:00:03.165,977] <err> ext_log_system: critical level log
        [00:00:03.165,991] <err> ext_log_system: error level log, 1 arguments: 1
        [00:00:03.166,006] <wrn> ext_log_system: warning level log, 2 arguments: 12
        [00:00:03.166,025] <inf> ext_log_system: notice level log, 3 arguments: 105
        [00:00:03.166,044] <inf> ext_log_system: info level log, 4 arguments : 1 24

Exit QEMU by pressing :kbd:`CTRL+A` :kbd:`x`.