Direct Test Mode receiver answer

RE: Direct Test Mode receiver answer

Kenneth — Thu, 09 Jul 2020 09:57:33 GMT

Håkon is on vacation, so I am taking a look at this case.

Have you taken a look at:
https://infocenter.nordicsemi.com/topic/struct_appnotes/struct/appnotes_nan34.html

This provide an example on how to use DTM in a production setup, including the requird DTM commands to run both TX and RX.

I did make a small modification to the python scripts to show how to perform DTM testing as per Figure 2 (Page 6) of the nAN34_v1.0.pdf show. In essence the modified Python script puts the nRF52-DK (lower tester) to run the receive test only, and analyze and report the results from a DUT in TX only. A small example is also attached how to emulate a DUT for test.

devzone.nordicsemi.com/.../dtm_5F00_tester_5F00_and_5F00_dut_5F00_single_5F00_channel.zip

The modified example may be closer to what you want.

If you are interested in knowing more of the commands and events you should check out the Bluetooth core specifications, and the "Direct Test Mode" chapter.

Best regards,
Kenneth

RE: Direct Test Mode receiver answer

Pierre cgwi22 — Wed, 01 Jul 2020 10:02:47 GMT

Hello,

Have you found something about our problem?

RE: Direct Test Mode receiver answer

haakonsh — Fri, 26 Jun 2020 08:55:53 GMT

[quote user="haakonsh"]If dtm_event_get returned 0 then the command it retrieved was not already received. It seems like this function executed as you would expect.

[/quote]

This was backwards, it returns 1 if there's a new DTM event. Is seems like you've got a NULL pointer which is not good.

I'll do some more digging.

RE: Direct Test Mode receiver answer

Pierre cgwi22 — Thu, 25 Jun 2020 13:36:08 GMT

Hello,

In fact, dtm_event_get() returns 1 but the dtm_event_t parameter is set to 0 and we have no other answer, nothing is happening after that.

We would like to know what is the normal result of the receiver test command (show data received? error rate?).

RE: Direct Test Mode receiver answer

haakonsh — Thu, 25 Jun 2020 12:33:43 GMT

bool dtm_event_get(dtm_event_t *p_dtm_event)
{
    bool was_new = m_new_event;
    // mark the current event as retrieved
    m_new_event  = false;
    *p_dtm_event = m_event;
    // return value indicates whether this value was already retrieved.
    return was_new;
}

If dtm_event_get returned 0 then the command it retrieved was not already received. It seems like this function executed as you would expect.

What exactly is your issue?