[Oberon] FPGA - nRF24L01 connection

[Jörg]

Hi Tomas

 

I was wondering why your gateway used RF_CH = 76 as default.

SCC.Mod does not know nor care whether you use 802.11 WiFi in parallel.

If there is WiFi in your area, RF_CH = 5 will interfere with WiFi channel 1.

To not interfere with WiFi you should set your RF_CH frequency to something higher to be beyond the WiFi spectrum.

In the US, RF_CH=76 is a good choice as it is beyond Wifi channel 11.

In Europe, it is possible to use up to Wifi channel 13, so RF_CH >= 85 would be a good choice.

 

If you want SCC.Mod not to interfere with WiFi, you should set your switches so that n DIV 4 MOD 10H * 10 + 5 >= 85.

 

br

Jörg

 

Von: Jörg Straube <joerg.straube at iaeth.ch>
Datum: Samstag, 7. April 2018 um 00:44
An: ETH Oberon and related systems <oberon at lists.inf.ethz.ch>
Betreff: Re: [Oberon] FPGA - nRF24L01 connection

 

Hi Tomas

 

You sure find out whats wrong, after you read

1) the nRF’s data sheet

http://www.nordicsemi.com/eng/nordic/content_download/2726/34069/file/nRF24L01P_Product_Specification_1_0.pdf

2) understand what parameters SCC.Start sets to initialize the chip

3) carefully compare these values with the chip initialization your gateway does.

 

Jörg


Am 06.04.2018 um 20:22 schrieb Tomas Kral <thomas.kral at email.cz>:

On Fri, 6 Apr 2018 14:47:20 +0200
Jörg <joerg.straube at iaeth.ch> wrote:



SCC.Start

Yes, I see, With my current SW setting I got channel `5'.
I changed RF_CH from 76 (default) to 5 and recompiled the gateway.
These parameters are now reported.

================ NRF Configuration ================
STATUS         = 0x0e RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=7
TX_FULL=0 RX_ADDR_P0-1     = 0xa8a8e1fc00 0xa8a8e1fc00
RX_ADDR_P2-5     = 0xff 0xc4 0xc5 0xc6
TX_ADDR         = 0xe7e7e7e7e7
RX_PW_P0-6     = 0x20 0x20 0x20 0x00 0x00 0x00
EN_AA         = 0x3b
EN_RXADDR     = 0x06
RF_CH         = 0x05
RF_SETUP     = 0x23
CONFIG         = 0x0e
DYNPD/FEATURE     = 0x3f 0x06
Data Rate     = 250KBPS
Model         = nRF24L01+
CRC Length     = 16 bits
PA Power     = PA_LOW

I wonder what other parameters I need to change to match Oberon SCC.Mod?

Many thanks

-- 
Tomas Kral <thomas.kral at email.cz>
--
Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
https://lists.inf.ethz.ch/mailman/listinfo/oberon

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