Help with BLE GPIOTE Interrupts with S110 on nRF51

[kilianod]

Hello

I'm having difficulty in executing an GPIOTE interrupt during a BLE connection event with the nRF51 DK. The interrupt I have works fine when the softdevice is advertising, but as soon as the it connects to another device the interrupt fails to execute. I'm using Version 8.0 of the SDK with Keil, and my code is based off the BLE UART example.

What I'm trying to do is get an LED to blink on the interrupt, and then do a soft-reset.

I first enable the GPIOTE interrupt on Pin 2 using:

nrf_gpio_cfg_sense_input(2, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_HIGH);
NRF_GPIOTE->INTENSET = GPIOTE_INTENSET_PORT_Msk;
NVIC_EnableIRQ(GPIOTE_IRQn);

The GPIOTE function is then given by :

    	void GPIOTE_IRQHandler(void)
{
    if(NRF_GPIOTE->EVENTS_PORT)
    {

			NRF_GPIOTE->EVENTS_PORT = 0; // re-enable the interrupt
			
			nrf_gpio_pin_write(28,0); // Turn on LED on Pin 28
			nrf_delay_ms(10);
			nrf_gpio_pin_write(28,1);
			
			 sd_nvic_SystemReset() // soft-reset
    	}
  }

I then setup the BLE connection with :

APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_MAX_TIMERS,   APP_TIMER_OP_QUEUE_SIZE, false); 
APP_GPIOTE_INIT(APP_GPIOTE_MAX_USERS); 
ble_stack_init(); 
uart_init();
gap_params_init();
services_init();
advertising_init();
conn_params_init();
sec_params_init();
advertising_start();

I've tried changing the priority as described here, but I have had no success. Any ideas why this isn't working? I assume its something to do with the priority of the interrupts. Also, does the soft-device use the GPIOTE_IRQHandler?

Any help would be much appreciated.

Thanks

[Susheel Nuguru]

There is one GPIOTE_IRQHandler in app_gpiote.c file, did you modify that to support your app use case?

[Krzysztof Chruscinski]

Don't see priority setting of GPIOTE interrupt. Default priority is the highest (0) so it may conflict with SoftDevice. Try calling something like:

NVIC_SetPriority(GPIOTE_IRQn, APP_IRQ_PRIORITY_LOW);

You can also try to use nrf_drv_gpiote driver (present in SDK 8.1) or app_gpiote.

[kilianod]

Hi Aryan Yes, I removed the GPIOTE_IRQHandler in the app_gpiote.c file and replaced it with my own function. Was this the correct thing to do to use GPIOTE_IRQHandler? Do I actually need app_gpiote for BLE connections? Thanks

[kilianod]

Hi Krzysztof I tried that also but it didd'nt make a difference. Should I use that command before or after I initialize the BLE? Thanks

[Susheel Nuguru]

This is not the correct way to do it. I am not sure where you are using app_gpiote here, but it wont function at all without that handler. Yo need to merge these two handlers into one if you have to use app_gpiote along with your use case

update: No, you dont need app_gpiote for BLE connections.