On Thu, Aug 2, 2012 at 3:22 PM, Alan Ott <a...@signal11.us> wrote: > > I'm currently able to talk between two systems, one system with the > Econotag and serial.c, and the other system with an MRF24J40 and a > driver I wrote[3] and am trying to test. I can ping6 between the two > systems with high reliability, but there seems to be trouble when > packets are sent too quickly from the Econotag. For example, if I change > the ping interval (-i) to 0.1, most of the packets get lost.
You might check that the MRF24J40 can keep up; the mc13224v uses DMA to transmit and can easily swamp most (if not all) 802.15.4 radios. It looks like the MRF24 has a 144 byte TX fifo; a little more than 1 packet. The default maca.c parameters can keep 32 full packets buffered. maca.c flushes the TX queue as fast as possible and the duty ratio is very close to 100% (I don't remember exactly what the turn around time is for back to back packets, but its very fast). Under that condition you'd have to make sure you are reading out the data as fast as it's coming in. The tests I typically do are with modified versions of rftest-tx and rx. You can do things like keep the TX queue full of random packets which will cause them to be transmitted as fast as possible ( guaranteed to take down any 802.15.4 network within 200 ft :) ). Or send out bursts when you press spacebar, or whatever you want to test. You can verify the reception with another econotag. Then try the same tests with the MRF24 and see how things go. As for the state of the linux serial driver, there was a patch recently committed that fixed a bug. It's probably not using the most recent version of libmc1322x as I have been away from the linux802154 dev for a while now. It shouldn't be too hard to up date the submodule and test against the latest libmc1322x. The serial link ends up as a bottle neck unless you set the baudrate to 921600. -Mar. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Linux-zigbee-devel mailing list Linux-zigbee-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-zigbee-devel
