ESB acknowledgment time-out value - clarification

RE: ESB acknowledgment time-out value - clarification

kammutierspule — Tue, 08 Dec 2020 09:52:12 GMT

Thanks a lot, I understand now!

RE: ESB acknowledgment time-out value - clarification

ovrebekk — Tue, 08 Dec 2020 09:42:39 GMT

Hi Mario

If you mean the act of stopping the timer on the ADDRESS event, this is handled by a PPI channel, as configured on line 573 in nrf_esb.c:

    NRF_PPI->CH[NRF_ESB_PPI_TIMER_STOP].EEP  = (uint32_t)&NRF_RADIO->EVENTS_ADDRESS;
    NRF_PPI->CH[NRF_ESB_PPI_TIMER_STOP].TEP  = (uint32_t)&NRF_ESB_SYS_TIMER->TASKS_SHUTDOWN;

This ensures that the ADDRESS event will immediately stop the timer, without having to wait for the software to respond to the event.

Best regards
Torbjørn

RE: ESB acknowledgment time-out value - clarification

kammutierspule — Mon, 07 Dec 2020 15:15:56 GMT

I understand the idea, I believe that was the described behavior on the nRF24L01+ datasheet.
but looking on the nrf_esb.c (I'm looking to SDK 17.0.2) I can't find where it deals the things that way.
Could you point me in the esb sourcecode what makes it work as you describe?

RE: ESB acknowledgment time-out value - clarification

ovrebekk — Mon, 07 Dec 2020 15:10:38 GMT

Hi Mario

The timeout timer is stopped as soon as the ADDRESS event of the RX packet occurs, it doesn't wait for the END event.

In other words the timeout doesn't have to be large enough to cover the entire length of the packet.

Best regards
Torbjørn