GPIO pin configuration parameters

[beemavishnu]

Hi,

 

I am using nRF52840 S140 V7.0.1. I have few queries on GPIO configurations.

 

Below are my PULLUP/PULLDOWN macros.

#define BUTTON_PULLUP        NRF_GPIO_PIN_PULLUP
#define BUTTON_PULLDOWN      NRF_GPIO_PIN_PULLDOWN
#define BUTTON_NOPULLUP      NRF_GPIO_PIN_NOPULL

 

As per my understanding

 

1) In below settings, pin is configured as PULLDOWN. So by default pin will be in low state. If there is change in pin from Low to High then only wake-up.

    {FMD_WAKEUP_PIN, APP_BUTTON_ACTIVE_HIGH, BUTTON_PULLDOWN, button_event_handler}, // Pull-Down, Active High

 

2) In below settings, pin is configured as PULLDOWN. So by default pin will be in low state. If there is change in pin from High to Low then only wake-up.

    {FMD_WAKEUP_PIN, APP_BUTTON_ACTIVE_LOW, BUTTON_PULLDOWN, button_event_handler}, // Pull-Down, Active Low

 

I could not find much explanation about Active High/Low in app_button_cfg_t structure. Correct me if I am wrong in my understanding.

 

Thanks & Regards

Vishnu Beema

[Jared]

Hi,

1)

The pin is pulled low meaning it's pulled down to GND i.e 0. The event handler will be called when the pin is high, i.e it's active HIGH.

2)

The pin is pulled low i.e GND. The event handler will be called when the pin is low i.e it's active LOW. 

regards

Jared