Cannot get button/gpio interrupt on NET CPU using nRF5340DK

[jyi]

Using just the nRF Connect SDK, I cannot get a push button to interrupt the NET CPU on the nRF5340DK.

I have the following code on the APP CPU:

  nrf_gpio_pin_mcu_select(23, NRF_GPIO_PIN_MCUSEL_NETWORK);

The following code runs on the NET CPU:

  nrfx_gpiote_init(NRFX_GPIOTE_DEFAULT_CONFIG_IRQ_PRIORITY);
  nrfx_gpiote_in_config_t cfg = NRFX_GPIOTE_CONFIG_IN_SENSE_TOGGLE(false);
  cfg.pull = NRF_GPIO_PIN_PULLUP;
  nrfx_gpiote_in_init(NRF_GPIO_PIN_MAP(0, 23), &cfg, MyEventHandler);
  nrfx_gpiote_in_event_enable(NRF_GPIO_PIN_MAP(0, 23), true);

Please help identify what I'm missing. Thank you in advance!

[Sigurd]

Hi,

jyi said:

I cannot get a push button to interrupt the NET CPU on the nRF5340DK.

By default, all pins are assigned to the application core. The application core's MCUSEL bitfield in register PIN_CNF[n] (n=0..31) (Retained) controls the allocation of the pins into cores, peripherals and the TaD subsystem. See this page.

In order to enable the network domain to have control of the GPIO,set the GPIO's MCUSEL to NetworkMCU. You can add this to the remoteproc_mgr_config() function, similar to how it's done for the UART pins in that function.

NRF_P0->PIN_CNF[MY_PIN_NUMBER] =
	GPIO_PIN_CNF_MCUSEL_NetworkMCU << GPIO_PIN_CNF_MCUSEL_Pos;