FIRST_CONN_PARAMS_UPDATE_DELAY error

Question

Hello,

I crated a custom peripheral for my application, I took the code from the Blinky example and i changed the service.

I set the FIRST_CONN_PARAMS_UPDATE_DELAY parameter like this :

#define FIRST_CONN_PARAMS_UPDATE_DELAY	APP_TIMER_TICKS(20000)					/**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (20 seconds). */

And the MIN_CONN_INTERVAL and MIN_CONN_INTERVAL like this :

#define MIN_CONN_INTERVAL				MSEC_TO_UNITS(200, UNIT_1_25_MS)			/**< Minimum acceptable connection interval (100 = 100 ms). */
#define MAX_CONN_INTERVAL				MSEC_TO_UNITS(300, UNIT_1_25_MS)		/**< Maximum acceptable connection interval (300 = 300 ms). */

After 20s i Expect the Conn interval to be around 300ms afer 20s in order to save power, unfortunately after 20s the code crash and i have no idea where, i put logs to where i belive is the crash but i don't see anything.

			case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
			{
				NRF_LOG_INFO("BLE_GAP_EVT_PHY_UPDATE_REQUEST");
				ble_gap_phys_t const phys =
				{
					.rx_phys = BLE_GAP_PHY_AUTO,
					.tx_phys = BLE_GAP_PHY_AUTO,
				};
				err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
				APP_ERROR_CHECK(err_code);
			} break;

static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
    ret_code_t err_code;

    if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
    {
				NRF_LOG_INFO("ble conn params failed");
        err_code = sd_ble_gap_disconnect(p_evt->conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
        //APP_ERROR_CHECK(err_code);
    }
		else
		{
			NRF_LOG_INFO("BLE_CONN_PARAMS_EVT_SUCCESS");
		}
}

I tried with those parameters :

#define MIN_CONN_INTERVAL				MSEC_TO_UNITS(200, UNIT_1_25_MS)			/**< Minimum acceptable connection interval (8 = 100 ms). */
#define MAX_CONN_INTERVAL				MSEC_TO_UNITS(300, UNIT_1_25_MS)		/**< Maximum acceptable connection interval (150 = 200 ms). */

And it works fine but i don't belive there is an PHY update.

On the other hand the bliky example works fine.

What did i do wrong ? For the central i used NRF connect on my phone and with the PC connected to a dev bloard.

Thank you

Vidar Berg · Accepted Answer

Thanks for uploading the project. Turns out the pointer address was set correctly, but got corrupted after the fault exception. 
 The problem was that you had increased the interrupt priority of the app timer (RTC1_IRQn) causing the SVC instruction from sd_ble_gap_conn_param_update() call to be executed from an interrupt with the same or higher priority than the SVC_IRQn, which is not permitted. 
 You should keep the default APP_TIMER_CONFIG_IRQ_PRIORITY setting (6). Also because a higher priority may lead to potential race conditions in other SDK modules which uses the same timer.

FIRST_CONN_PARAMS_UPDATE_DELAY error

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