Electrical signal linked to the push action

[Beldramma]

Hi,

I am working with the bsp.c functions. One of the actions is BSP_BUTTON_ACTION_PUSH, which the value is 1. I would like to know at which electrical signal it is related :  is it a up to down or down to up ?

I am working with SDK 15.2. 

[Turbo J]

Beldramma said:

is it a up to down or down to up

That is configurable in the board's header file: BUTTONS_ACTIVE_STATE

Edit: On the DKs, the buttons are usually active low.

[Beldramma]

Hi Turbo J, thanks for you fast answer.

My BUTTONS_ACTIVE_STATE is at 1. So that mean that my push button is active when i come from low to high ?

Do you know where i can find this information?

[Beldramma]

I think that it is that. 

From the doc : 

" The buttons are active low, meaning the input will be connected to ground when the button is activated. The buttons have no external pull-up resistor, so to use the buttons the P0.13–P0.16 pins must be configured as an input with an internal pull-up resistor. "