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When a push-button is released and PA13/PA14 are defined as input (high-Z) the LED should not be active as the circuit is open but a small current leak through PCB or push-button close the circuit and allows a small LED bias giving erroneous level voltage. So it is recommended to activate an internal pull-up in order to clearly fix the voltage at PA13/PA14 when button is released and to wait a short delay before to read the GPIO value only when the pull-up is correctly configured. Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
see doc/board/st/stm32mp1.rst