Using GPIO as button

RE: Using GPIO as button

Amanda Hsieh — Fri, 07 Feb 2020 14:12:06 GMT

Hi,

I tested with the changes he posted in DevZone, it is working fine. I get a BSP_EVENT_KEY_4 event when I connect P1.06 to GND (We tested in this way because we don't have an external button). I did not use nrf_gpio_cfg_input(newPin, NRF_GPIO_PIN_PULLUP); in main. I do not see what good that should do, but he BSP library will configure the buttons correctly.

-Amanda H

RE: Using GPIO as button

matan — Wed, 22 Jan 2020 09:48:15 GMT

I now have a different problem. I can replace one of the existing buttons with my external button but I don't succeed to use it in addition to the existing ones.
Here are the changes I made.

In pca10056.h:
==============
modified:
   #define BUTTONS_NUMBER 5
added:
   #define BUTTON_5       NRF_GPIO_PIN_MAP(1,6)
   #define BUTTONS_LIST { BUTTON_1, BUTTON_2, BUTTON_3, BUTTON_4, BUTTON_5 }
   #define BSP_BUTTON_4   BUTTON_5

In sdk_config.h:
================
modified:
#define GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS 5

In main.c:

========
Added:
   #define newPin NRF_GPIO_PIN_MAP(1, 6)
   inside bsp_evt_handler():
      case BSP_EVENT_KEY_4
   in main():
      nrf_gpio_cfg_input(newPin, NRF_GPIO_PIN_PULLUP);

RE: Using GPIO as button

matan — Tue, 21 Jan 2020 08:37:40 GMT

I used the VDD from the board instead of the 5V. It works fine now, thanks for the help

RE: Using GPIO as button

Turbo J — Mon, 20 Jan 2020 18:11:12 GMT

[quote userid="85770" url="~/f/nordic-q-a/56770/using-gpio-as-button"]I expected that whenever I connect the 5V on the board to pin 1.3[/quote]

I expect the µC to blow up..

SCNR

NRF5x chips do not allow 5V on GPIO pins - see absolute maximum ratings in the PS.

Also, a button that is configured with a pullup enabled will be active low.