CTE packet recognition

RE: CTE packet recognition

Simonr — Tue, 27 Apr 2021 12:22:28 GMT

This case is almost a year old at this point, and does not seem directly related to your question. Please create a new ticket explaining what exactly you're struggling with in detail. If you find this case relevant, please feel free to link to it in your ticket.

Best regards,

Simon

RE: CTE packet recognition

Zack_Lee — Tue, 27 Apr 2021 02:44:41 GMT

hi all, may i know which example you use to add CTE packets. i cant really get it.

RE: CTE packet recognition

Andreas — Thu, 16 Jan 2020 12:35:43 GMT

Hi,

EVENTS_CTEPRESENT is only generated in RX, if I understand you correctly you are looking at TX for now. Even so it requires that you structure the CTEinfo packet contents correctly, as described in the PS.

I still think your method is sufficient to prove there is a CTE appended to your packet.

Best regards,

Andreas

RE: CTE packet recognition

Siddharth Venkatesh — Wed, 15 Jan 2020 20:01:02 GMT

Thanks for that. I did as you suggested and implemented a variable increment. The code for that is below.

while (NRF_RADIO->EVENTS_PHYEND == 0U)
{
while (NRF_RADIO->EVENTS_END == 0U)
{
}
a++;
}

And the output did show that when I had the code from my original question working, the variable 'a' was higher. This confirmed that the having the CTE code increased the time before the EVENTS_PHYEND event happened.

Without the CTE code, 'a' was 7.

With the CTE code, 'a' was 42.

However when I checked the value of:

NRF_RADIO->EVENTS_CTEPRESENT

to see if the CTE was present, the value kept displaying 0. I don't know why it is 0 even though I can see an increase the variable 'a'.

Am I using this EVENTS_CTEPRESENT variable wrong? Or is the CTE code I have shown in my original question not enough to generate a CTE packet?

Thanks

RE: CTE packet recognition

Andreas — Tue, 14 Jan 2020 07:26:34 GMT

Hi,

The easiest way would be to demodulate the signal, e.g. using a spectrum analyzer.

You could probably use a timer, or increment a variable in a while loop, to get the time between EVENTS_END and EVENTS_PHYEND. If they happen at the same time then there is no CTE, if the time between is similar to what you configure in DFECTRL1 then there is CTE.

Best regards,

Andreas