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samples: boards: st: blink with low power mode management in DEBUG

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Add a precision about the CONFIG_DEBUG :
When CONFIG_DEBUG is set, the system will not enter the low power mode
The DEBUG is possible but with higher power consumption of the target.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2025-06-09 13:43:38 +02:00 committed by Daniel DeGrasse
parent 613478f189
commit 3978ca15ff
2 changed files with 13 additions and 0 deletions
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9
samples/boards/st/power_mgmt/blinky/README.rst
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@ -40,6 +40,15 @@ After flashing, the LED starts to blink with a fixed period (SLEEP_TIME_MS).
When LPTIM input clock has a prescaler, longer perdiod (up to 64 seconds)
of low power can be tested.
.. warning::
Debugging this sample may require enabling :kconfig:option:`CONFIG_DEBUG` ``=y``.
That will enable the :kconfig:option:`CONFIG_STM32_ENABLE_DEBUG_SLEEP_STOP`
and prevent the system to go to low power mode.
When enabled, entry in low-power modes will not disable power in the power domains
that should be powered off, ensuring that the debug logic remains always
available. However, low-power modes will no longer reduce the system's
power consumption in this configuration, which is the opposite of what
this sample is attempting to demonstrate.
PM configurations
*****************

4
samples/boards/st/power_mgmt/blinky/prj.conf
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@ -4,3 +4,7 @@ CONFIG_PM_DEVICE_RUNTIME=y
CONFIG_PM_DEVICE_SYSTEM_MANAGED=y
CONFIG_ASSERT=y
CONFIG_GPIO=y
# un-comment to allow debugging while in low-power mode
# (inhibits reduced power consumption from being observed)
#CONFIG_DEBUG=y