How is the Internal implementation of the UART receiver sampling technique in the nRF52810

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

JONATHAN LL — Tue, 27 Apr 2021 12:00:09 GMT

The oversampling is 16x the baudrate.
Regards,
Jonathan

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

awneil — Mon, 26 Apr 2021 12:54:06 GMT

usually, it is a multiple of the baud rate - which makes sense

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

CRO — Mon, 26 Apr 2021 12:50:32 GMT

Hi Jonathan

Thank you very much!

Could you also state at what sampling rate the three samples are taken?
(e.g. 16 MHz ~ 62.5 ns)
Is it also depending on the baud rate?

Regards, Carsten

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

JONATHAN LL — Mon, 26 Apr 2021 09:44:40 GMT

I just don't want to over promise something that i can not guarantee even if it is the norm by other product/company documentation standards.

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

JONATHAN LL — Mon, 26 Apr 2021 09:42:03 GMT

Here is the update for you,

Each bit is sampled three times, where the sampling happens in the center of the received bits, and a majority vote is done on the three samples to decide the bit value.

Regards,
Jonathan

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

awneil — Mon, 26 Apr 2021 09:03:58 GMT

[quote userid="91187" url="~/f/nordic-q-a/74271/how-is-the-internal-implementation-of-the-uart-receiver-sampling-technique-in-the-nrf52810/306720#306720"]figure out if it is something that we can share[/quote]

It is something that is usually described in microcontroller documentation - so there shouldn't be any issue in sharing it?

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

JONATHAN LL — Mon, 26 Apr 2021 08:58:07 GMT

Hi Carsten,

it might take some time before I have information or figure out if it is something that we can share, but i will update you as soon as I have new for you.

Regards,
Jonathan

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

CRO — Thu, 22 Apr 2021 19:42:01 GMT

Yes please check HW implementation info and provide it, if possible. Best regards Carsten

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

JONATHAN LL — Thu, 22 Apr 2021 12:28:00 GMT

You can check out the the driver level of the nrfx UART and UARTE, if you want info on the HW implementation i will see what i can do.

Regards,
Jonathan

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

CRO — Wed, 21 Apr 2021 21:38:36 GMT

Working as consultant on a large volume project, need to know the detail if possible.

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

JONATHAN LL — Wed, 21 Apr 2021 14:26:54 GMT

Hi,

Do you have a specific issue, use case or is it just curiosity?

Regards,
Jonathan

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

awneil — Wed, 21 Apr 2021 13:43:33 GMT

[quote userid="103666" url="~/f/nordic-q-a/74271/how-is-the-internal-implementation-of-the-uart-receiver-sampling-technique-in-the-nrf52810/306056#306056"]of cause[/quote]

Sadly, that seems to be the exception rather than the rule.

😞

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

CRO — Wed, 21 Apr 2021 10:26:58 GMT

Yes, of cause :-)

I have checked nRF52810 - Product Specification v1.3.

There is no specification of the sampling timming for the UART.

RE: How is the Internal implementation of the UART receiver sampling technique in the nRF52810

awneil — Wed, 21 Apr 2021 10:18:56 GMT

Have you checked the Product Specification ?