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nRF52832 unmodulated carrier via timeslot?

pgv gravatar image

asked 2018-01-12 13:14:55 +0100

Hello,

my usecase is the following: I'd like to use SoftDevice for BLE Advertising / Scanning - every now and then I'd like to "pause" BLE for a few miliseconds and send data via an unmodulated carrier using on-off-keying. However I also need to swich between 2 frequencies. Such that at time t_i I'd be transmitting with frequency f1 and at t_i+1 I'd be transmitting with f2.

I have seen that the TimeSlot API seems to support what I need but my questions are mainly:

  1. By accessing the Radio from a TimeSlot - can I pick the frequency and just turn on the unmodulated carrier similar to the radio test in DTM?
  2. Since I need to switch between 2 frequencies: Is it known how long nRF52832 needs to switch between 2 frequencies?
  3. I saw that the nRF51 had a maximum time on how long the carrier should stay on. Is there a similar limitation on the nRF52?

Thank you very much, Paul

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ovrebekk gravatar image

answered 2018-01-12 16:10:36 +0100

Hi Paul

  1. Yes, during a timeslot you have full control of the radio, and can use it in any way you see fit.
    Just make sure to power off the radio by the time the timeslot ends.

  2. To change frequency you need to disable the radio, change the channel, and power it back up again. Starting the radio takes 40us in the fast mode, so the whole process should be finished in less than 50us.

  3. No, there is no such limit for the nRF52.

Best regards
Torbjørn Øvrebekk

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Comments

Bo shuda Torbjørn! Thanks for the response

Paul ( 2018-01-14 16:11:33 +0100 )editconvert to answer

Chobaso ;)

Torbjørn Øvrebekk ( 2018-01-15 14:08:28 +0100 )editconvert to answer

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Asked: 2018-01-12 13:14:55 +0100

Seen: 25 times

Last updated: jan. 12