Slower DFU upload with PA/LNA?

[ftjandra]

On SDK16.0.0 + Mesh SDK 4.1.0

I've followed this to add PA/LNA support in the bootloader (Fanstel BT840X). I see the increase in RSSI and know that it is working.

But I noticed right away that a DFU upload is now much slower than before I added the PA/LNA support in the bootloader.

What would cause this?

Thanks.

[Joakim Jakobsen]

Hi.

Could you elaborate on "DFU upload is now much slower"? How much slower is the transfer after PA/LNA?

I'll create a ticket for our Mesh developers, and ask if they have seen any problems with this before.

[ftjandra]

The nRF Connect app shows the segment number that it's transferring. With the PA/LNA enabled I can see it count individually, i.e. 1/35, 2/35, 3/35 one at a time. Without the PA/LNA it jumps thought them much faster, i.e. 1/35, 4/35, 8/35 etc. So it's at least three times faster without the PA/LNA.

[Joakim Jakobsen]

Thanks.

I'll forward this to our developers and ask if they have seen anything similar. I haven't seen any issues with this before.

Br,
Joakim

[ftjandra]

The problem seems to be an out-of-spec 32.768kHz clock on the modules we are using. If I synthesize the clock from the 32MHz clock then everything works fine.

You can close this ticket.

Thanks.

[Joakim Jakobsen]

Thanks for sharing the solution.

Br,
Joakim