On Tue, 28 Jan 2014 23:23:17 +0400 Dmitry Eremin-Solenikov <dbarysh...@gmail.com> wrote: > General question: do you base on rf212 or rf212B chips (there is an > app note on Atmel's site describing differences between those chips). > It is ok to target only one version of the chip, provided you put a > notice in the source file.
I'm working with rf212 (not rf212b). Since those two chips differ in part version, I'll add a check for the version to only support the rf212 version in my driver. > Ok. You actually forced me to open the -2011 standard. > Now I have the impression that LBT is a property of the channel band > (let's call it subpage - several channels in the same page, spanning > sequential frequencies). Am I right, or it is actually a property of > the channel band in some countries (e.g. you may use 950Mhz with CSMA > in countries A and B and with LBT in C). > > What is more correct? As far as I understand it, you have the choice between CSMA and limited radio duty cycles (say, no more than 1% of air time for any given node) or LBT and no limitations on radio duty cycles. In some bands though, the duty cycle limit for !LBT indeed seems to be 0%, as you mentioned with the 950 MHz band (in this case in Japan). > AACK requires that HW/PAN/short address is set in the registers. RF212 requires this either way, or it will not receive any frame that is not a broadcast. > Another and more important use case is having several 802.15.4 > interfaces on a single phy. I had an idea of requesting capabilities > through add_iface (so one can create one 'accelerated' iface and > several 'unaccelerated' ones), however nobody ever implemented > this. Maybe this part needs to be redesigned. Several wpan interfaces on one wpan-phy are broken as far as I can see. Currently, adding a wpan to a phy will set the address filters, and at least RF2xy seems to use these filters also in simple receive modes if they have been set. For these radios, you'll have to enter promiscuous mode either way if you have multive wpans per phy. Also, each subif of a phy can have it's own channel and page. This can lead to situations where only a subset of the wpans is capable of receiving frames _at all_, where users will certainly expect something else. As far as I can see, we can either put the radio in promiscuous mode when multiple wpans are configured and not allow channel/page setting per wpan, but only per phy - or we'll add a big fat note "maybe only one wpan per phy can be active at any given time, depending on your radio". > Is it possible to use ARET without waiting for an ACK frame? Yes, just clear the REQ_ACK flag in the frame sent. TX_ARET in RF2xy will then return immediatly. You can also disable retransmission by setting the retransmission limit to 0. I have no API for this yet, but I'll add one once I'm at that point again. ------------------------------------------------------------------------------ WatchGuard Dimension instantly turns raw network data into actionable security intelligence. It gives you real-time visual feedback on key security issues and trends. Skip the complicated setup - simply import a virtual appliance and go from zero to informed in seconds. http://pubads.g.doubleclick.net/gampad/clk?id=123612991&iu=/4140/ostg.clktrk _______________________________________________ Linux-zigbee-devel mailing list Linux-zigbee-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-zigbee-devel
