Change the connection interval

Hi support,

My program's logic is about external ADC once every 4 ms mining data, after the acquisition by the interrupt tell MCU 14580, MCU open a ring buffer to store the ADC result, when there are five result start data (notify), 20 bytes data size, namely every 20 ms have a pack of packet to send, send before the arrival of the first check GATTC_CMP_EVT, connection interval is set to 10-20 ms, practical tests show that when the connection is not data connection interval for regular 18 ms (roughly), when to start the notify, connection interval of 18 for ms sometimes, sometimes to 36 ms, sometimes for 54 ms, each connection interval to send packet is also different, sometimes 1 package, sometimes 2 packs, sometimes 3, 4 package, it is not scientific, the connection interval should be not influenced by any factors, why the oscilloscope out wave type of show is this result?

The following is part of the code:

1.
Enum arch_main_loop_callback_ret user_app_on_ble_powered (void)
{
If (ptr_in!= ptr_out) / / if there is data left in the ring data buffer and then wake up the BLE to notify
{
Return KEEP_POWERED;
}

Return GOTO_SLEEP;
}
2.
Enum arch_main_loop_callback_ret user_app_on_sytem_powered (void)
{
Uint8_t tempdata [2].
Int qrsdata_in;

If (adc_int_is_set) / / adc sample is complete
{
Ads1115_get_adc_result (tempdata);

DATA_FIFO [ptr_in] [ADC_VALUE_SIZE * (1 + cycle_num)] = tempdata [0]./ / store the adc sample result in the ring data buffer
DATA_FIFO [ptr_in] [ADC_VALUE_SIZE * (1 + cycle_num) + 1) = tempdata [1]./ / store the adc sample result in the ring data buffer

Cycle_num + +;
If (cycle_num = = cycle_num) / / cycle_num = 5
{
DATA_FIFO [ptr_in] [0] = (uint8_t) (counter / 256);/ / high byte
DATA_FIFO [ptr_in] [1] = (uint8_t) (counter % 256);/ / low byte
If (counter = = 0 XFFFF)
{
Counter = 0;
Flag = true;
}
Counter++;
{if (flag) counter = 0;Flag = false;}

Cycle_num = 0;

Ptr_in + +;
If (ptr_in > = PACKET_NUMBER) ptr_in = 0;

Adc_int_is_set = false;
Return KEEP_POWERED;/ / need to notify the data
}
Adc_int_is_set = false;
}
Return GOTO_SLEEP;/ / no need to notify the data
}
3.
The static const struct arch_main_loop_callbacks user_app_main_loop_callbacks = {
App_on_init = user_app_init,
App_on_ble_powered = user_app_on_ble_powered,
App_on_sytem_powered = user_app_on_sytem_powered,
App_before_sleep = NULL,
App_validate_sleep = NULL,
App_going_to_sleep = NULL,
App_resume_from_sleep = NULL,
};
4. Send function data, first check TX_IS_COMPLETED logo
Uint8_t data_send_process (void)
{
If (!TX_IS_COMPLETED) return 0;/ / the their weight.this notification is complete

Data_to_notify (DATA_FIFO [ptr_out], PACKET_SIZE);/ / data transmitting

Ptr_out + +;

If (ptr_out > = PACKET_NUMBER) ptr_out = 0;

TX_IS_COMPLETED = false;/ / clear the TX_COMPLETE flag

Return 0;
}
5. Data_send_process () at the time of BLE on call
The static inline void schedule_while_ble_on (void)
{
/ / BLE clock is enabled
While (ble_is_powered ()) {

/ / BLE event end is set. The conditional RF calibration can run.
Uint8_t ble_evt_end_set = ke_event_get (KE_EVENT_BLE_EVT_END);

/ / the execute the messages and events
Rwip_schedule ();

/ /
If (ble_evt_end_set)
{
Uint32_t sleep_duration = 0;
Rcx20_read_freq ();

/ / if you have the enough time run a temperature calibration of the radio
If (lld_sleep_check (& sleep_duration, 4)) / / 6 slots - > 3.750 ms
/ / check the time and temperature to the run radio calibrations.
Conditionally_run_radio_cals ();
}

/ / grant control to the application, try to go to sleep
/ / if the applciation returns GOTO_SLEEP
If (!App_asynch_trm ())
Break;

/ / SDKIMPROVEMENTS Needs testing!!!!!We can add the following condition and move
/ / it out of the loop
/ / we may consider putting it in before the app_asynch_trm
/ / if (GetBits16 (CLK_CTRL_REG RUNNING_AT_XTAL16M))

/ / the execute the printf process
Arch_printf_process ();
Data_send_process ();
}
}
6. TX_IS_COMPLETED setting, when a packet of data sent on time
Void user_catch_rest_hndl (ke_msg_id_t const msgid,
Void const * param,
Ke_task_id_t const dest_id,
Ke_task_id_t const src_id)
{
The switch (msgid)
{

Case CUSTS1_VAL_NTF_CFM:
{
Struct custs1_val_ntf_cfm const * msg_param = (struct custs1_val_ntf_cfm const *) (param);

The switch (msg_param - > the handle)
{
Case ECG_IDX_DATA_VAL:

TX_IS_COMPLETED = true;/ / set the if the their weight.this packet is transmitted completely

Break;

Default:
Break;
}
} break;

Default:
Break;
}
}
Environment:
SDK5.0.3
The test phone: iphone6 and samsung s6

BR,

Young,