ESB 'noack = true' packets never arrive at receiver (NRF52, SDK 15.3)

[Marcin Sleziak]

I'm in the process of implementing a custom layer above ESB in order to allow more than 8 devices to communicate with a receiver (By tagging packets with a device ID)

I wanted to disable all ACK functionallity as this will be handled by my implementation.

I have however run into an issue where if i set

cf.selective_auto_ack = true;

And

tx.noack = true,

The packets never arrive at the receiver end:

static void esb_event_handler(nrf_esb_evt_t const *p_event)

{

    NRF_LOG_INFO("Something happened!");

}

As soon as I turn off selective_auto_ack or set noack to false the receiver starts receiving data again.

Is there something I'm missing here? I have the feeling that I've missed some detail within the ESB user guide.

Both devices are NRF52.

[Joakim Jakobsen]

Hi! 

Do you have the same configuration on both sides?
If not, could you try using the same configuration on the receiver side as well and see if you can receive data?

Best regards, 
Joakim

[Marcin Sleziak]

Hi Joakim, after stripping the code to bare metal I've found out what the problem was.

Before each transmission I was requesting the HF clock and releasing it when the transmission was done. What I did not account for was the time needed to start up the clock.

It was a lucky coincidence that everything worked fine with ACK enabled.

I've simply added

    while (!nrf_drv_clock_hfclk_is_running())

    {

    }

And everything works as expected. My apologies for this.

I'll convert my code to use the clock_clk_started_notify now that I know what the issue was.

[Joakim Jakobsen]

I'm glad you figured it out! And thanks for sharing your solution so that others might benefit from it! 

Best regards.