nrf52832 ESB tx/rx example MAX SPEED

[Ivan]

Hello.

I'm testing ESB examples with nrf52832.
Want to understand which max speed I can reach with that protocol?
Some devzone info says that 1.8mbps can be reached.

But among with my tests I can't get such speed.
What I've done.
I set max 252 byte payload, use 2mbps baudrate, 16 bit CRC and no-ackn.
On transmitter side I send packets in a loop without any extra delay.
On receiver size I set counter to report every 1000 packets arrive.
I get it reported apx. per 1 second, which seems really slower than it says in documentation.
Maybe I can set smth extra settings to enlarge the speed?

Any suggestions?

All my best.
Ivan.

[Håkon Alseth]

Hi,

 

Try setting fast ramp up, field "RU" in register MODECNF0:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/radio.html?cp=3_1_0_22_13_44#register.MODECNF0

 

Should be set on both sides, ie: the prx and ptx.

 

Cheers,

Håkon

[Ivan]

changes this:
NRF_RADIO->MODECNF0 = (NRF_RADIO->MODECNF0 & ~RADIO_MODECNF0_RU_Msk) | RADIO_MODECNF0_RU_Default<< RADIO_MODECNF0_RU_Pos;

to this:

NRF_RADIO->MODECNF0 = (NRF_RADIO->MODECNF0 & ~RADIO_MODECNF0_RU_Msk) | RADIO_MODECNF0_RU_Fast << RADIO_MODECNF0_RU_Pos;

but actually nothing changes on speed...

[Håkon Alseth]

Is that a change in nrf_esb.c? If yes; please revert that change.

Try setting the change in main, after init, but before starting the radio.

[Ivan]

set it like this, flashed to both devices, still same

[Håkon Alseth]

How many packets are you receiving per second?

Example: if you receive 500 payloads per second, of 252 bytes each, that is 252*800*8bits / 1024 = ~788 kBit/s