Hi, On Tue, 4 Jan 2022 at 10:44, Miquel Raynal <miquel.raynal@xxxxxxxxxxx> wrote: > > Hi Alexander, > > alex.aring@xxxxxxxxx wrote on Tue, 28 Dec 2021 16:05:43 -0500: > > > Hi, > > > > On Wed, 22 Dec 2021 at 10:57, Miquel Raynal <miquel.raynal@xxxxxxxxxxx> wrote: > > > > > > A default channel is selected by default (13), let's clarify that this > > > is page 0 channel 13. Call the right helper to ensure the necessary > > > configuration for this channel has been applied. > > > > > > So far there is very little configuration done in this helper but we > > > will soon add more information (like the symbol duration which is > > > missing) and having this helper called at probe time will prevent us to > > > this type of initialization at two different locations. > > > > > > > I see why this patch is necessary because in later patches the symbol > > duration is set at ".set_channel()" callback like the at86rf230 driver > > is doing it. > > However there is an old TODO [0]. I think we should combine it and > > implement it in ieee802154_set_channel() of "net/mac802154/cfg.c". > > Also do the symbol duration setting according to the channel/page when > > we call ieee802154_register_hw(), so we have it for the default > > settings. > > While I totally agree on the background idea, I don't really see how > this is possible. Every driver internally knows what it supports but > AFAIU the core itself has no easy and standard access to it? > I am a little bit confused here, because a lot of timing related things in the phy information rate points to "x times symbols". If this value depends on the transceiver, how are they compatible then? > Another question that I have: is the protocol and center frequency > enough to always derive the symbol rate? I am not sure this is correct, > but I thought not all symbol rates could be derived, like for example > certain UWB PHY protocols which can use different PRF on a single > channel which has an effect on the symbol duration? Regarding UWB PHY I see that for values like LIFS/SIFS they reference a "preambleSymbols" value which is defined. I need to do more research regarding this. - Alex
