My ESB PTX receives delayed duplicate ACK packets from my PRX

RE: My ESB PTX receives delayed duplicate ACK packets from my PRX

ovrebekk — Mon, 24 Aug 2020 08:54:18 GMT

Hi Justin

Thanks for the confirmation, interesting to know that you can also get issues with a single pipe using the older code.

Changing the SWI0 interrupt to the QDEC interrupt should not have an impact on execution, as long as you don't use the QDEC peripheral obviously.

Best regards
Torbjørn

RE: My ESB PTX receives delayed duplicate ACK packets from my PRX

jrowe — Fri, 21 Aug 2020 15:47:50 GMT

Hi Torbjørn,

The design does normally use multiple pipes, but for the test case that I setup to debug the problem I only had one PTX device actually transmitting. The PRX was still configured to receive on multiple pipes though.

Also, I forgot to mention in my original post that I did make one small change to the nrf_esb implementation.

I changed

#define ESB_EVT_IRQ SWI0_IRQn
#define ESB_EVT_IRQHandler SWI0_IRQHandler

#define ESB_EVT_IRQ QDEC_IRQn
#define ESB_EVT_IRQHandler QDEC_IRQHandler

because I use SWIO for the app_timer.

RE: My ESB PTX receives delayed duplicate ACK packets from my PRX

ovrebekk — Fri, 21 Aug 2020 07:17:22 GMT

Hi Justin

I am happy to hear that the modified implementation solved your issue 🙂

Can you confirm whether or not you use one or multiple pipes?

The changes in the nrf52-esb-buffer-improvements repo were merged in SDK v17.0.0, but unfortunately there was an issue with the merge and some lines of code were not included. As such the current implementation in SDK v17.0.x also has some issues.

This has been reported internally, and I am hoping the proper implementation will be included in a future update to the SDK.

Best regards
Torbjørn

RE: My ESB PTX receives delayed duplicate ACK packets from my PRX

jrowe — Thu, 20 Aug 2020 16:10:50 GMT

Hi Torbjørn,

Fantastic! I just tested it out, and it did fix the problem! Do you know if the changes have been incorporated into a newer version of the SDK?

Many thanks,

Justin

RE: My ESB PTX receives delayed duplicate ACK packets from my PRX

ovrebekk — Thu, 20 Aug 2020 13:52:41 GMT

Hi Justin

Are you able to try out the nrf_esb implementation available here?
https://github.com/too1/nrf52-esb-buffer-improvements

It is essentially identical to the one in the nRF5 SDK, but with some changes to the way ACK payloads are handled. The changes were added to solve an issue when using multiple pipes, but it might also affect your application.

Best regards
Torbjørn