Hi,
On 7/9/21 9:53 AM, Patrick Delaunay wrote:
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
arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi | 4 ++-- arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi | 4 ++-- board/st/stm32mp1/stm32mp1.c | 2 ++ 3 files changed, 6 insertions(+), 4 deletions(-)
Applied to u-boot-stm/master, thanks!
Regards Patrick