nRF52 840 UARTE EVENTS_ENDRX not generated after TASKS_STOPRX

[cm600]

Hi there,
I have a custom board with nRF52840 and i am transferring fairly large amounts of data via uarte.
I am also using my own driver. For some reason the attached device decided to go crazy and the result is that RXD.MAXCNT is full to the max.  RXD.AMOUNT == RXD.MAXCNT and ERRORSRC value is 0x05 or 0x0D   All this is not a big problem except that when this situation happens the EVENTS_ENDRX is not generated after TASKS_STOPRX = 1

    NRF_UARTE1->TASKS_STOPRX = 1;
    NRF_LOG_INFO("WAIT ENDRX\n");
    while(!NRF_UARTE1->EVENTS_ENDRX); //stoprx generates endrx always ?!?!
    
i.e. I am waiting forever after -> NRF_LOG_INFO("WAIT ENDRX\n");
I guess that this is related to the ERRORSRC somehow but can't figure out how to proceed.

[Jørgen Holmefjord]

Hi,

Please read the Reception chapter of the UARTE documentation. Triggering STOPRX task will trigger a RXTO event.

Best regards,
Jørgen

[Jørgen Holmefjord]

You should only check the RXD.AMOUNT register after the ENDRX event is received:

The RXD.AMOUNT register can be queried following an ENDRX event to see how many new bytes have been transferred to the RX buffer in RAM since the previous ENDRX event.

I'm not sure why the ENDRX event is not generated in the second case, could it be related to the errors reported? Have you seen it in cases without any errors reported?

[cm600]

No, it only happens when ERRORSRC != 0

[Jørgen Holmefjord]

Then I would recommend that you check why you are getting overrun and framing errors, and fix these. You can wait for EVENTS_ENDRX or EVENTS_ERROR in your application to catch and handle the errors in runtime.