Interrupt in the middle of serial transmission?

RE: Interrupt in the middle of serial transmission?

ovrebekk — Thu, 21 Jan 2021 09:39:39 GMT

Awesome, I will consider the case closed then 🙂

RE: Interrupt in the middle of serial transmission?

nordev — Fri, 15 Jan 2021 04:04:08 GMT

Thanks so much for this extra information, I was able to find out what was causing this gap and remove it! It was silly, a debug print statement (NRF_LOG_RAW_INFO) immediately following the serial_write call. It took so long because it looped through the entire message in order to print it. Thank you for your help!

RE: Interrupt in the middle of serial transmission?

ovrebekk — Thu, 14 Jan 2021 16:23:41 GMT

Do you know if you are using the UART or UARTE peripheral under the hood?

If easyDMA is enabled you will be using the UARTE peripheral.

If you are using the legacy UART peripheral then the UART transmission can be interrupted by other system interrupts, but 1.3ms is a very long time to be interrupted. Do you know of any interrupt sources in your application that could be this long?

Interrupting everything else for 6-10ms is not ideal, and it will definitely cause issues if you are running a SoftDevice stack on the side. Hopefully we can figure out what is causing this gap in the communication.

Best regards
Torbjørn