UART faster than 1Mbps?

RE: UART faster than 1Mbps?

ramyasree — Mon, 18 Mar 2024 04:30:49 GMT

RE: UART faster than 1Mbps?

hmolesworth — Fri, 15 Mar 2024 19:36:33 GMT

Yes, here are a few links; iosonata now has the upgraded calculation included although there is some discussion on which higher baud rates work in a given system. One issue is whether the far end (where the nRF52/3/4 is the near end) can precisely support some of the higher rates; using Loopback mode on the nRF shows whether nRF-to-nRF works at a given baud rate.

technical-question-regarding-uart-baud-rate-generator

uart-sample-code-for-receiving-transmission

uart-transmission-max-bytes

uart_nrfx.cpp

RE: UART faster than 1Mbps?

ramyasree — Fri, 15 Mar 2024 12:52:25 GMT

hi hmolesworth
can you please share the code with me?
i am currently working on nrf52840 uart for a custom board trying to reach above 1mbps, so can you please share the hardware pics/requirments if possible.
.
it would help my work.

RE: UART faster than 1Mbps?

hmolesworth — Sun, 24 Sep 2023 02:04:25 GMT

You can run the UART Tx transmitter at 1, 2, 4 or even nearly 8Mbps (I have done this) but the receiver is limited to 1Mbps due to the usual UART multi-sample-voting algorithm with 16MHz clock and divide-by-16 sampling. I can share code if you want to test that, but it's really only useful for either transmit-only data at (say) 2Mbps or (with a bit of pain) an asymmetrical baud rate half-duplex link with 2Mbps Tx and 1Mbps Rx. It works though.

Edit: I posted the code here custom-uart-baud-rate .. and ah, don't expect Nordic official support to necessarily agree with me (no offence intended) :-)