IRC log for #neo900 on 20150603

00:00.15wpwrakDocScrutinizer05: ah, didn't notice. you must have been unusually discreet about that ;-)
00:01.09wpwraki may try to order some stuff in a few weeks. i could try to sneak some NFC things into that order
00:02.28ZetaRDocScrutinizer: What do you recommend I work after this? I was thinking about some improvements to I2C current efficiency.
00:03.01ZetaRwork on* even.
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21:01.52ZetaRAre there any plans to add openings for additional slots/buttons/connectors/etc to the side of the spacer? I notice that Digikey has 1.25mm microSD and microSIM push-push slot connectors.
21:02.09ZetaR1.25mm high* to clarify.
21:02.50ZetaRExamples: http://www.digikey.com/product-detail/en/ST10S008V4BR1800/670-2682-1-ND/3929609  http://www.digikey.com/product-detail/en/693021010811/732-5955-1-ND/5047618
21:05.01ilonDocScrutinizer05: Is the it final not to include battery hotswap capability? That made me really sad when I read it :(
21:05.58ilonI would say existing micro SD card is placed really good
21:06.04DocScrutinizer05ZetaR: we already picked a SIM slot-in holder for dual sim, for this purpose
21:06.22ilonalso, as long as I can't get DSDS, I dont care about the sim =/
21:06.29ZetaRAh, okay.
21:06.41ilonDocScrutinizer05: still no modem support for it i guess?
21:06.50ilonDocScrutinizer05: or did something change?
21:07.21ZetaRilon: SIM == smartcard IIRC, so it may have more uses than just SIM depending on how it is connected internally.
21:07.33ilonright
21:07.49DocScrutinizer05ilon: we'll see what can get done, we will squeeze out as long a "bridging time" for fast batt hotswap as we can. But I can't guarantee it will really work. Or it works only for <0.2s. or whatever
21:08.42DocScrutinizer05NFC can use either of both SIM, and you can use the 2nd (non-active) SIM to read it out from CPU
21:10.05DocScrutinizer05(NFC) via SWP
21:10.12ZetaRVery nice. So the GNU Fellowship Smartcard should work?
21:10.25ZetaRWait, that might be a different profile.
21:10.41DocScrutinizer05and no, it's not a security threat since we have control over NFC so it can't get activated when user doesn't allow
21:11.41DocScrutinizer05sorry this forbids use of NFC when battery removed/empty
21:12.06bencohhmm, I dont get it
21:12.18DocScrutinizer05ask! :-)
21:13.20bencohis there a host-driven mostfet/switch/whatever inside the nfc circuit ?
21:13.33DocScrutinizer05no, a complete MCU
21:13.56DocScrutinizer05between the NFC radio and the SWP/SIM
21:14.08bencohso the nfc part isnt powered by the "reader" ?
21:14.13DocScrutinizer05no
21:14.18bencohhmm'kay
21:14.18ZetaRThis should have the same profile as a SIM card... OpenPGP smartcard: http://www.g10code.de/p-card.html
21:14.38bencohbut it still gets the clock and everything for the transaction to work ?
21:14.46DocScrutinizer05yes
21:14.52bencohfun
21:15.26bencohcan it act as a reader as well, or just as a tag ?
21:15.45DocScrutinizer05it can do everything the radio chip allows. Which is quite a lot
21:16.17DocScrutinizer05please see werner's very fine NFC whitepaper
21:16.32DocScrutinizer05we didn't idle the last 6 months
21:16.36DocScrutinizer05;-)
21:16.57bencohright, I had seen it, but didnt take time to seriously read it ... my bad
21:17.26DocScrutinizer05the NFC whitepaper is prolly instructional for other phone makers and generally NFC makers
21:18.00bencohand nfc "hackers" as well
21:18.06DocScrutinizer05sure :-)
21:18.17bencohconsidering what you've just said about how it should work
21:18.28DocScrutinizer05we squeezed out the last hacker's joy from that NFC
21:19.01DocScrutinizer05you could even implement your own NFC protocol creations
21:19.16bencoh:-)
21:19.17DocScrutinizer05or snoop, or whatever
21:20.02DocScrutinizer05the NFC radio chip has certain limitations, but we picked one that we found has least of those
21:23.12ZetaRSo just how flexible is the direct mode? The paper seems to imply that it is something like direct RX/TX modulation of the carrier?
21:25.09DocScrutinizer05sort of, yes
21:25.59DocScrutinizer05please look up deatils in NFC whitepaper. It's a complex thing not easily discussed / questions-answered here in IRC
21:26.48ZetaRReference says: "Direct Mode 0 (bit 6 = 0, as defined in ISO Control register) allows the user to use only the front-end functions of the reader, bypassing the protocol implementation in the reader. For transmit functions, the user has direct access to the transmit modulator through the MOD pin (pin 14). On the receive side, the user has direct access to the subcarrier signal (digitized RF envelope signal) on I/O_6 (pin 23)."
21:26.57DocScrutinizer05so?
21:28.02ZetaRI will just read the TI paper on it, then. Some of it is just a bit confusing to me.
21:31.23wpwrakconfusing it is :) a good part of our NFC paper is just about trying to bring a bit of structure into that NFC/RFID zoo ...
21:32.01ZetaRRight, its a very nice and clear paper.
21:32.09wpwrakand yes, in the most direct of direct modes, the MCU directly modulates the carrier (or receives the demodulated carrier)
21:32.16wpwrakthanks ! :)
21:33.51ZetaRWell, it is well deserved. A zoo it is. It seems like a lot of these protocols are multiplied in complexity unnecessarily.
21:39.43wpwrakwell, each company wants their pet protocol. so you get one for NXP, one for TI, one for Sony. then each find issues or come up with improvements, and so on ... ;-)
21:40.58DocScrutinizer05Neo900 probably also is one of the most versatile NFC development tools available
21:42.37ZetaRDocScrutinizer05: You know, NFC developers might be interested in a heads up about the Neo900 in case they hadn't already heard of it.
21:44.00DocScrutinizer05yes, I'm aware of that. We need a new advertising campaign which actually lists all the widely unknown smart features of Neo900
21:45.38ZetaRHmm, I am going to be out of town in a few days, but I could help out with that after.
21:47.14DocScrutinizer05appreciated. Thanks
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