Hello
We have a product where the central can connect almost every slave. It works fine, but when connecting client slave it connects fine and finds service fine but always disconnects after 4s with reason BLE_HCI_CONNECTION_TIMEOUT.
SDK:16.0
Base Project:ble_central_and_peripheral
Crystal Oscillator
NRF_CLOCK_LF_SRC_XTAL
NRF_SDH_CLOCK_LF_RC_CTIV
NRF_SDH_CLOCK_LF_RC_TEMP_CTIV
NRF_CLOCK_LF_ACCURACY_20_PPM
Connect Pamans
conn_params.min_conn_interval = MSEC_TO_UNITS(20, UNIT_1_25_MS);
conn_params.max_conn_interval = MSEC_TO_UNITS(40, UNIT_1_25_MS);
conn_params.slave_latency = 0;
conn_params.conn_sup_timeout = MSEC_TO_UNITS(4000, UNIT_10_MS);
static void conn_params_init(void)
{
ble_conn_params_init_t cp_init;
memset(&cp_init, 0, sizeof(cp_init));
cp_init.p_conn_params = NULL;
cp_init.first_conn_params_update_delay = APP_TIMER_TICKS(100);
cp_init.next_conn_params_update_delay = APP_TIMER_TICKS(5000);
cp_init.max_conn_params_update_count = 3;
cp_init.start_on_notify_cccd_handle = BLE_GATT_HANDLE_INVALID;
cp_init.disconnect_on_fail = false;
cp_init.evt_handler = on_conn_params_evt;
cp_init.error_handler = conn_params_error_handler;
APP_ERROR_CHECK(ble_conn_params_init(&cp_init));
}
static void ble_evt_handler(ble_evt_t const *p_ble_evt, void *p_context)
{
...
case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
APP_ERROR_CHECK(sd_ble_gap_conn_param_update(
p_ble_evt->evt.gap_evt.conn_handle,
&p_gap_evt->params.conn_param_update_request.conn_params));
break;
...
}
Personally I think external 32khz crystal oscillator may cause this problem,so I change to use the internal crystal oscillator, It works well.
#define LF_CLK_SRC_RC \
{ \
.source = NRF_CLOCK_LF_SRC_RC, \
.rc_ctiv = 16, \
.rc_temp_ctiv = 2, \
.accuracy = NRF_CLOCK_LF_ACCURACY_500_PPM \
}
I'm confused about this, our 32khz crystal is ±20 ppm and it works fine in our other products.
Can you give me some advice,thanks.
Can you give me some advice,thanks.
