Radio Pulses per transmit interval

RE: Radio Pulses per transmit interval

ovrebekk — Thu, 14 Jan 2021 11:10:41 GMT

Hi Joseph

Apparently the 6 packet limit is not an absolute maximum, it is just the maximum that the stack can guarantee.

If you process the events fast enough on the peripheral side it is possible to start reading out the data during the connection event, which will free up more buffers in the stack immediately. When this happens it is possible to receive more than 6 packets in one connection event.

Best regards
Torbjørn

RE: Radio Pulses per transmit interval

josephwinnDJ — Wed, 13 Jan 2021 21:33:52 GMT

Hi Torbjørn:

As a followup, we measured the VDD current consumption into the micro via a series resistor in attempt to isolate transmit activity from receive.

With our board connect to our app and firmware invoked to stream data to the app, we observe 8? power current pulses. Considering that in this state we should be saturating the 6 transmit buffers, can you help explain the additional 2 pulses?

Thanks,
Joseph

RE: Radio Pulses per transmit interval

ovrebekk — Fri, 08 Jan 2021 08:40:39 GMT

You welcome 🙂

I will consider the case closed then, unless you have more questions.

RE: Radio Pulses per transmit interval

josephwinnDJ — Thu, 07 Jan 2021 17:06:24 GMT

Thanks Torbjørn!

RE: Radio Pulses per transmit interval

ovrebekk — Wed, 06 Jan 2021 14:16:03 GMT

Hi Joseph

Keep in mind that the receive and transmit will show up as separate pulses. If you see 9 pulses this probably corresponds to the peripheral receiving 4 packets from the central, responding to each of them with it's own packet, and then turning on the receiver for the fifth time without receiving anything from the central.

The time between packets in Bluetooth should be 150us, which you can probably verify by enlarging the plot in the time axis.

Best regards
Torbjørn