Data Rate Measurment

[trk]

Hello all. while trying to calculate the data rate from bluetooth low energy , i have two questions

1. Is there a possibility to measure the data rate by using nrf sniffer? I tried using sniffer but in wireshark i found only advertisement packets.
2. Then i tried master control pannel for calculating data rate., From the tests i have done these are the results For connection interval of 100 ms (i did min rate and max rate are same) i get 92 packets in the first trial and 100 packets in the second trail For connection interval of 50 ms (Min rate = Max rate ), i got 30 packets in first trail 25 packets in second trail 12 packets in third trail 31 packets in fourth trail 25 packets in fifth trail

Then i changed Min connection interval to ((X/2) * 1.25 ) and max connection interval to (x/2) * 2 here x is macro value when x=80 ; and writing interval is 10ms(writing interval is time interval where data is written to ble buffers in nordic) data rate is 60 packets , for x=80 and writing interval is 1ms then data rate is 300 packets for x= 40 and writing interval is 10 data rate is 120 packets, and for writing interval is 1 ms data rate is 250 packets.

There is no consistency when ever we are taking the reading. From this i want to know how many buffers are present in nordic ble and is there any way to calculate the data rate because in master control pannel the resolution is 100 ms. Thank you

[Stefan Birnir Sverrisson]

Hi trk. To unblock the CPU during radio event you need S110 7.1. S110 7.0 does not have this capability, i.e. you can not unblock the CPU with S110 7.0. If you however use S110 8.0 then the CPU is unblocked by default. You also need third revision of the nRF51 hardware

[trk]

hello stefan, i want to use s110 v 7.1.0. I was trying to replace .h files from new s110 v 7.1.0 to location in older .h files location in pc. I want to confirm that is that correct method to replace .h files from new s110 soft device and is there any changes to do in .h files? Also i have trouble finding the version of hardware that i am using. How can i find out which version i am using?

[Stefan Birnir Sverrisson]

Yes, if you want to use a more recent softdevice, then you need to copy the .h files given with the softdevice you want to use into e.g. \nrf51_sdk_v6_1_0_b2ec2e6\nrf51822\Include\s110 folder, if you are using SDK 6.1. However, any application that runs with S110 7.0.0 should also work fine with S110 7.1.0, since it is a minor softdevice update, so no reason to update header files unless you intend to use additional features available in S110 7.1.0. However, when going from i.e. S110 6.0.0 to S110 7.1.0, that is a major softdevice update and then it may be easier to simply copy your custom code into a SDK that is directly compatible with S110 7.1.0, i.e. SDK 6.x or SDK 7.x, see the nRF51 compatibility matrix for further information on what is compatible.

[Stefan Birnir Sverrisson]

Look at the chip markings on the nRF51 chip you have on your kit and compare that with the information in the nRF51 compatibility matrix to find out what chip revision you have. The matrix also maps development kits to chip revision directly

[trk]

Hello stefan, i ordered version 3 nrf51822, and when i used s110 v8.0 header files for radio unblocking. when i attach those header files to the keil environment and when i was trying to compile there are many errors shown up because some of the soft device functions i used there are modified in new s110 v 8.0. so how can i use the new s110 along with v3 hardware.? with s110 v7.0 and version 3 hardware my code is working fine, but still radio is blocked.