nrf52832 and AFH

RE: nrf52832 and AFH

genzy9 — Tue, 15 Dec 2020 12:18:03 GMT

Thanks a lot for your clear explanation. It helped a lot to understand.

RE: nrf52832 and AFH

run_ar — Fri, 11 Dec 2020 13:48:17 GMT

The Master and slave follows a specific channel hopping algorithm so it will change channel for each connection event, the channel map is there to tell the peripheral which channels are good to use and not so the master and slave uses the same channels for it's hopping algorithm.

If you want to take a closer look at this you could try to sniff the ble traffic using the nRF sniffer and you can see how the channel changes from one connection event to the next.

RE: nrf52832 and AFH

genzy9 — Thu, 10 Dec 2020 05:35:38 GMT

Thank you for your response.

But among all available channels specified by the master, the chip could perform AFH if needed... What is the point then to send a channels maps to the peripheral if he can't switch to the best channels ? It will always stay on the same channel ? I am confused about the role of this channel map.

RE: nrf52832 and AFH

run_ar — Wed, 09 Dec 2020 12:58:58 GMT

Hi,

The BLE peripheral cannot choose which channel to use. It has to use the channel map set by the master device. If the master detects that a channel has interference, it would typically remove those from the channel map and send a channel map update request to the slave.