NCS: ESB how much are max ptx speed and what can i do to increase the speed

RE: NCS: ESB how much are max ptx speed and what can i do to increase the speed

Håkon Alseth — Thu, 30 Dec 2021 09:58:46 GMT

Hi,

[quote user="spring.liu"]up to 1700kbit/s I think that's the limit[/quote]

Yes, this is the very maximum, but please note that this is without any packet loss. As mentioned, you can get packet loss in a wireless connection.

Kind regards,

Håkon

RE: NCS: ESB how much are max ptx speed and what can i do to increase the speed

spring.liu — Thu, 30 Dec 2021 08:59:40 GMT

up to 1700kbit/s I think that's the limit

RE: NCS: ESB how much are max ptx speed and what can i do to increase the speed

Håkon Alseth — Thu, 30 Dec 2021 08:46:08 GMT

Hi,

[quote user="spring.liu"]

You can change this by manually setting the MODECNF0 register, field "RU" to 1:

https://infocenter.nordicsemi.com/topic/ps_nrf52840/radio.html?cp=4_0_0_5_19_13_69#register.MODECNF0

it is the same with 5340 setting the MODECNF0 register, field "RU" to 1:

[/quote]

Yes, this is similar in all nRF52- and nRF53 devices.

Kind regards,

Håkon

RE: NCS: ESB how much are max ptx speed and what can i do to increase the speed

spring.liu — Thu, 30 Dec 2021 03:29:43 GMT

You can change this by manually setting the MODECNF0 register, field "RU" to 1:

https://infocenter.nordicsemi.com/topic/ps_nrf52840/radio.html?cp=4_0_0_5_19_13_69#register.MODECNF0

it is the same with 5340 setting the MODECNF0 register, field "RU" to 1:

RE: NCS: ESB how much are max ptx speed and what can i do to increase the speed

Håkon Alseth — Wed, 29 Dec 2021 12:51:30 GMT

Hi,

[quote user=""]Some devzone info says that 1.8mbps can be reached.[/quote]

In wireless applications, you will always have re-transmissions, meaning it is highly likely not possible with auto-acking enabled.

[quote user=""]

I increased the dynamic load to 252 ,and It can send about 700 packets in a second.

I set the retransmission and autoack.

so, 252*700*8/1024=1378.kbit/s ,Can not reach 2M

[/quote]

2 Mbit is the on-air datarate, and you will get a lower data throughput than this, as you have preamble, addressing and CRC in the on-air payload as well.

The default turn-around time for the radio is set, for compatibility reasons with nRF51 and nRF24L-series devices, to 130 us. "esb" library unfortunately does not have an API to change this at this time, so it must be set manually in your application.

You can change this by manually setting the MODECNF0 register, field "RU" to 1:

https://infocenter.nordicsemi.com/topic/ps_nrf52840/radio.html?cp=4_0_0_5_19_13_69#register.MODECNF0

If you set this register to '1' on both the PRX and PTX, each transmission will go down to 40 us ramp-up time and you will get a increased throughput.

Kind regards,

Håkon