getting NRF_LIBUARTE_ASYNC_EVT_OVERRUN_ERROR after long time of use

[Roy@techpacklab]

Hello,

im using nrf52840 with sd140 and sdk17.0.1

in my project i have implemented a libuarte communication that works well usually, but rarely, and usually after days of running i get this error:

NRF_LIBUARTE_ASYNC_EVT_OVERRUN_ERROR

i do nothing to handle this error and continue regularly and after this i start getting jumbled strings from the libuarte.

meaning if i send something like this:

"

123456789

123456789

123456789

123456789

abcdefghijklmnopqrstvuwxyz

"

i might get something like this:

"

123456789\n

123456789\n

123456789\n

123456789\n

abcdefghijklm123456789\n

nopqrstvuwxyz

"

i have seen a similar question in the following link:

https://devzone.nordicsemi.com/f/nordic-q-a/63905/libuarte-issue-nrf_balloc_alloc-retuns-null-after-a-while

and it ended up in saying that it got resolved somehow with the timers, which i kind of suspected,  but still don't know how to resolve.

i init the libuarte by:

NRF_LIBUARTE_ASYNC_DEFINE(xxxxx_libuarte0, 0, 1, 2, NRF_LIBUARTE_PERIPHERAL_NOT_USED, ATCMD_LIBUARTE0_RX_BUF_SIZE, ATCMD_LIBUARTE0_RX_BUF_CNT);    // using uart0 ; TIMER1; RTC2

this problem is very rare which makes it difficult to debug. 

please advise,

Regards,

Roy Barak

TechPack Lab

[Simonr]

Hi

I'm guessing the HWFC might be "stalling" the error for some time, but that it does not solve the problem. The only other suggestions I have is that this is likely caused either by the buffer_size or the timeout of your libuarte implementation. Can you try tweaking these somewhat to see if that helps?

As a back-up plan, I guess you can try just disabling and enabling the libuarte peripheral, but you should test this to make sure it works.

Best regards,

Simon

[Roy@techpacklab]

Hi,

yes, i figured that this is the next step and modified the libuarte init.

from:

#define ATCMD_LIBUARTE0_RX_BUF_CNT 3

#define ATCMD_LIBUARTE0_RX_BUF_SIZE 255

NRF_LIBUARTE_ASYNC_DEFINE(atcmd_libuarte0, 0, 2, NRF_LIBUARTE_PERIPHERAL_NOT_USED , 3 , ATCMD_LIBUARTE0_RX_BUF_SIZE, ATCMD_LIBUARTE0_RX_BUF_CNT); // using uart0 ; TIMER2; TIMER3

to:

#define ATCMD_LIBUARTE0_RX_BUF_CNT 9

though i believe that this is more avoiding the issue then handle it, since i just increased the buffer so it will probably never (or much more rarely) will get overflowed.

it is running for several days now, will update regarding results.

Regards,

Roy