Like in C test. If MAX STDDEV is lower than single clock cycle then
set it to a single clock cycle.
Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>
Fix incomplete test log capture when the external tool is used
and Twister Pytest Harness script ends without reading output
from the last test case running on the device.
Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>
Additional logging of kernel.timer.timer_behavior_external test case
statistics for timer drift, variance, etc. as JSON-formatted records
to make easier data collection and its further analysis.
These log records will be processed by the Twister Harness recording
feature which captures and parses timer statistics from the log output,
then composes it into twister.json and recording.csv files.
Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>
This patch adds a way to simplify using an external tool to measure
timer behaviour on Zephyr. It modifies the timer behaviour
jitter_drift.c tests to toggle a GPIO pin (defined via a new DTS
compatible, "test-kernel-timer-behavior-external") that can be connected
to an external tool, such as a logic analyzer, to measure timer
behaviour.
This GPIO pin toggle is behind a new CONFIG_TIMER_EXTERNAL_TEST Kconfig.
A new pytest test is added so that it can collect the statistics from
the external tool and assert some measurements. To collect statistics
from the external tool, one needs to provide a Python module which
provides a `run(seconds, config)` method, that will perform the test and
return the statistics. Check the README file for more information about
this interface.
Finally, this on twister, this new test is behind a new fixture,
"gpio-timerout".
Signed-off-by: Ederson de Souza <ederson.desouza@intel.com>
Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
