how to increse the ble rate between the 52840 centarl and 52840 device ?

RE: how to increse the ble rate between the 52840 centarl and 52840 device ?

Karl Ylvisaker — Wed, 27 May 2020 08:45:07 GMT

No problem at all, I am just trying to understand you issue so that I may help with resolving the issue :)
If you could elaborate on what behavior you are seeing, and how it is different from what you would have expected - along with the things I asked about in my previous comment - that would be highly beneficial.

Looking forward to resolving this issue together,

Best regards,
Karl

RE: how to increse the ble rate between the 52840 centarl and 52840 device ?

pipixia_8_8 — Wed, 27 May 2020 08:34:54 GMT

yes,im sorry for my bad expression.

RE: how to increse the ble rate between the 52840 centarl and 52840 device ?

Karl Ylvisaker — Wed, 27 May 2020 08:30:30 GMT

Hello,

[quote user="pipixia_8_8"]thank for your reply[/quote]

No problem at all, I am happy to help!

[quote user="pipixia_8_8"][/quote]

,i try to change the min intercal and max interval,the value is 7.5ms，the rate is really improved.and

400KB data tranfer takes 6s. it also is low compare to theoretical value.

I am glad to hear that you were able to increase your throughput.

[quote user="pipixia_8_8"]But the ble_central's demo cant transfer data as this speed.[/quote]

What do you mean by this?
Are you able to transfer the 400 KB between your phone and the peripheral, but unable to achieve the same throughput between the Nordic UART central example and peripheral example - is this what you are saying?

Best regards,
Karl

RE: how to increse the ble rate between the 52840 centarl and 52840 device ?

pipixia_8_8 — Wed, 27 May 2020 07:48:22 GMT

Hi,

thank for your reply,i try to change the min intercal and max interval,the value is 7.5ms，the rate is really improved.and

400KB data tranfer takes 6s. it also is low compare to theoretical value. i chek my phone,the connect interval is 7.5ms by

the log of nrfconnect.But the ble_central's demo cant transfer data as this speed.

RE: how to increse the ble rate between the 52840 centarl and 52840 device ?

Karl Ylvisaker — Wed, 27 May 2020 07:13:31 GMT

Hello,

The smallest code-changes you can make for the biggest gain in throughput speed that you can make is to reduce your connection interval.
Your current connection interval is set from 30 ms to 75 ms, which is a lot higher than the 7.5 minimum connection interval.
If you are only going to be connected to a single peripheral, you could set it to the minimum 7.5 ms, to maximize how often your devices will be communicating with each other. You can implement this change by setting both MIN_ and MAX_CONN_INTERVAL to 7.5 ms on your central device, configured in the sdk_file of the Nordic UART example. If you do this, then you also need to make sure that your peripheral device supports 7.5 ms connection interval.
Bear in mind that decreasing the connection interval increases the active radio time, leading to increased power consumption.

If you would like to have a look at a maximum-throughput example using the new 2Mbps limit of BLE 5.0, you should take a look at this image transfer demo. It will require a higher effort to familiarize with than the Nordic UART example, but in return it demonstrates the highest speeds you may obtain using BLE.

Best regards,
Karl