RE: Configure GPIO Interrupt on nRF9160

kgarland789 — Mon, 09 Nov 2020 18:45:33 GMT

Thanks for the response Jay, greatly appreciate it.

RE: Configure GPIO Interrupt on nRF9160

Jan Rychter — Sat, 07 Nov 2020 13:20:27 GMT

Since I've just had to go through the same discovery process, here is what works for me:

  static struct gpio_callback button_callback;

  gpio_pin_configure(gpio0, BUTTON, GPIO_INPUT | GPIO_ACTIVE_LOW);
  gpio_init_callback(&button_callback, button_callback_handler, BIT(BUTTON));
  gpio_add_callback(gpio0, &button_callback);
  gpio_pin_interrupt_configure(gpio0, BUTTON, GPIO_INT_EDGE_BOTH);

And to get your gpio0:

#define GPIO_PORT DT_LABEL(DT_NODELABEL(gpio0))
const struct device *gpio0;
gpio0 = device_get_binding(GPIO_PORT);

Be careful with the last parameter to gpio_init_callback(), it does not take the pin number, but a bit mask. That's one hour of my life I'm not getting back.

I am still unclear what context the callback executes in, but I suspect it's the interrupt context, because trying to sleep there promptly hangs my system. I wish this was documented.