nrf52833 AoA getting started

RE: nrf52833 AoA getting started

Andreas — Mon, 09 Dec 2019 08:45:29 GMT

Hi,

There is documentation for this example in our infocenter. Comments to your steps:

1) The pattern is also used in the header for the devices to find each other.

3) RX sweep does not stay put on the frequency you have assigned, it will sweep the frequency up to the end channel, then repeat. You might need to use the start_rx command, I do not think sweeping only 1 channel works (based on your pt 5 if might though).

Regarding your questions:

- All the tests run until you cancel them or pull the power from your DUT.

- You would want to avoid using the tx_carrier and sweep_tx commands, as those are unmodulated and hece does not contain any data. The difference between the last two is just that the duty_cycle one inserts a delay between the packets to obtain the specified duty cycle.

- Registers are only reset if overwritten or if the device/peripheral is power cycled.

- This example does not have support to specify the number of packets, it is meant to enable TX or RX modes for regulatory RF testing. You need to add this yourself.

Best regards

Andreas

RE: nrf52833 AoA getting started

benkokes — Wed, 04 Dec 2019 19:35:00 GMT

Hi Andreas,

Thank you for the response. Is there a step-by-step guide that better outlines how to use the radio_tests example in the SDK?

Can you comment on the steps needed to transmit a pattern to a receiver ( both tx and rx are separate PCA10100 DKs):

1) a pattern needs to be defined ( random pattern doesn't work).

2) setup the start and end channel to be the same, for my case, I used channel 22.

3) start rx_sweep on the RX board.

4) start the start_tx_modulated_carrier on the TX board.

5) wait 10 seconds, then dump the buffer on the RX board using rx_print command. It then dumps about 100 samples (?) to the screen.

Questions I have:

-After I issue the start_rx_sweep on the RX board, how long does it run?

-Do I need to perform a start_rx before I issue the start_rx_sweep command?

-There are 3 'start_tx_" commands, does it matter which one I use to enable me to transmit a pattern?

-On the RX side, I want to read I/Q data. Does the DFEPACKET.MAXCNT get reset after I read out that data?

-How do I specify the quantity of packets to the TX'd? Since the transmitted tone is continuous, does the receiver dictate that by the sampling rate in DFECTRL1? ( assuming that the TX and RX start transmitting/listening simultaneously) I want to make sure that I can match this on the RX DFEPACKET.COUNT register.

Thanks,

-Ben

RE: nrf52833 AoA getting started

Andreas — Tue, 03 Dec 2019 10:22:57 GMT

Hi,

Yes, the Softdevice does not allow you tampering with the registers while running, so unfortunately this is not possible and part of the reason why there is no SDK support. For now, you need to use an application that does not use the Softdevice, e.g. the radio examples in the SDK or our Solar Beacon reference design code.

Best regards,

Andreas