[Oberon] FPGA - nRF24L01 `RPI Net' server

Tomas Kral thomas.kral at email.cz
Wed May 30 09:29:49 CEST 2018

On Wed, 30 May 2018 07:24:39 +0200
Jörg <joerg.straube at iaeth.ch> wrote:

> In ideal conditions without any retransmits Net.SendFiles would need
> 1.5 seconds to transmit your NRF.Mod (6158 bytes)

Good, this is an ideal target, I may one day get close to.

> As you need about four times as long, there must be many retransmits
> going on under the hood. Did you move the channel out of the way of
> possible Wifi in your environment? Try setting the channel to
> something bigger than 86 —> WriteReg1(RFCH, 86);

True, I have quite a few retransmits, with or without decoupling caps.
Also tried various other power supplies. Will try to play with channels
once again.

> rPi and your Oberon board is roughly 1 meter, try set the power level
> to -18 dBm. —> WriteReg1(RFSETUP, 0);

In fact 10cm, that was my first discovery, with full power, 0dBm, 30%
ping was the usual standard, now I get 98-99%. Also `SCC.SubSnd()'
delay has some influence on it.

I have added these lines to `SCC.Start()', 

WriteReg1(4, 0*010H + 15); (*SETUP_RETR delay + retry count*)
WriteReg1(6, 03H); (*RF_SETUP <= 1Mb rate, 0dBm wide range, -12dBm
short reach*)

Will try -18dBm again, last time noticeable improvement was the
stepdown from 0dBm to -12dBm. 

Tomas Kral <thomas.kral at email.cz>

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