7 Replies Latest reply on Apr 23, 2017 5:44 PM by yoshizu_1678311

What is rr-interval about heat_rate_monitor?

yoshizu_1678311 Apr 18, 2017 12:58 AM

HI,

I'm trying to data transfer test between heart_rate_monitor and heart_rate_collector.

Sometimes the heart_rate_collector side send NACK to the heart_rate_monitor side.

According to my investigation so far,

the retransmit ratio fluctuates according to the rr-intrval value of heart_rate_monitor side.

Please tell me the role of rr-interval?

best regards,yoshizu

1. Re: What is rr-interval about heat_rate_monitor?

e.pratt_1639216 Apr 18, 2017 11:01 AM (in response to yoshizu_1678311)

RR interval is a value associated with the Variation of beat to beat intervals. http://support.polar.com/us-en/support/Heart_Rate_Variability__HRV_
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2. Re: What is rr-interval about heat_rate_monitor?

yoshizu_1678311 Apr 18, 2017 7:35 PM (in response to yoshizu_1678311)

Thanks.

By the way,

sometimes I found that heart_rate_collector send NACK after data received   from heart_rate_monitor.

Does PSoC heart_rate_collector program involve this action?

or

Does PSoC heart_rate_collector program can't involve this action?

regards,yoshizu.
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3. Re: What is rr-interval about heat_rate_monitor?

e.pratt_1639216 Apr 20, 2017 7:48 AM (in response to yoshizu_1678311)

I haven't worked with the heart rate collector/monitor programs. That said, I would imagine the NACK is sent by the heart rate collector if it failed to get the data in some way. I would suggest looking through both projects to see the behavior it is implementing involving the NACK.
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4. Re: What is rr-interval about heat_rate_monitor?

yoshizu_1678311 Apr 20, 2017 4:17 PM (in response to yoshizu_1678311)

Thanks.

I'm investigating PSoC source program.

I am guessing whether the receive buffer size is small at heart_rate_collector side.

But I can't found where NACK send (NESN is countinues 1 ) logic.

regards,yoshizu.
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5. Re: What is rr-interval about heat_rate_monitor?

e.pratt_1639216 Apr 21, 2017 9:33 AM (in response to yoshizu_1678311)

Looking through the PSoC 4 BLE_Heart_Rate_Sensor" example, I don't see any code that would send a type of NACK back; Do you have an example of the data that is being returned on a NACK? Have you tried looking for code/text related to that data being returned? There is a UART debug console, have you tried using that to see what is going on? Is it important to not have NACKs occurring? Are you sure the NACK is being used as a NACK for data exchange, and not to signal something else?
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6. Re: What is rr-interval about heat_rate_monitor?

Madhu Lakshmipathy Apr 22, 2017 11:35 AM (in response to yoshizu_1678311)

Hi,

Are you observing the NAK using a BLE Sniffer?

The NAK is handled automatically automatically by the internal BLE Stack and cannot be viewed in the generated sources. How often do you observe this issue?

Regards,

- Madhu Sudhan
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7. Re: What is rr-interval about heat_rate_monitor?

yoshizu_1678311 Apr 23, 2017 5:44 PM (in response to yoshizu_1678311)

Dear Madhu.


This NACK transmission has occurred at high frequency.



Below is trace data by air capture tool.

Please look NESN.
                                                                         NESN SN
10,781 20 0xda14d79d 0x008c 1 Empty 1M 0 0 0 0 18 00:00:00.000351 2017/04/14 8:06:48.013065
10,782 20 0xda14d79d 0x008c 2 Start 1M 1 0 1 15 33 00:00:00.000230 2017/04/14 8:06:48.013295
10,783 20 0xda14d79d 0x008c 1 Empty 1M 1 1 0 0 18 00:00:00.000351 2017/04/14 8:06:48.013646
10,784 20 0xda14d79d 0x008c 2 Start 1M 0 1 1 15 33 00:00:00.000230 2017/04/14 8:06:48.013876
10,785 20 0xda14d79d 0x008c 1 Empty 1M 1 0 0 0 18 00:00:00.000351 2017/04/14 8:06:48.014227

This retry is not occured at between PSoC's heart_rate_monitor and android's heart_rate_collector.

regards,yoshizu.
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