Topic for #qi-hardware is now Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben / atusb 802.15.4 wireless, and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs
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<wpwrak>
how long does the RTC actually maintain time ?
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<kristianpaul>
nothing
<kristianpaul>
well, seconds i guess
<wpwrak>
there's a circuit that's supposed to power it for a bit: D1 and C20 (47 uF). but i'm not sure this does much good.
<kristianpaul>
bit? like the first palm m100 ;)
<wpwrak>
hmm, the diode has a reverse current of about 2 uA
<wpwrak>
hmm, simulation says that this should be sufficient for about 4 seconds
<wpwrak>
kristianpaul: your estimate wasn't so bad :)
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<wpwrak>
actually, it's worse. since the diode drops some 200-300 mV. that's just about the voltage range the cap could buffer over. so it's ~1 second, worst-case.
<wpwrak>
maybe in real life this translates to up to 10 s. perhaps that's what causes the ben to lock up if you do a very quick power cycle.
<wolfspraul>
kristianpaul: you are too fast! [spam] :-)
<wolfspraul>
thanks for helping
<kristianpaul>
hehe :-), just getting ready to go work :)
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<kristianpaul>
btw is taking so long the package with stickers/brochure to arrive
<kristianpaul>
but i guess no rush, a package from Artyom took near 3 months to get here..
<wolfspraul>
who knows
<kristianpaul>
indeed
<kristianpaul>
must go, read you later
<wolfspraul>
in the last 2.5 years that I've sent hundreds of packages I think I can remember loosing one, and that was to Colombia
<kristianpaul>
:-|
<wolfspraul>
Mirko dropped a letter (unregistered, untrackable) into the mail but it never arrived
<wolfspraul>
that was the only case ever
<wolfspraul>
so let's see
<wolfspraul>
maybe it arrives, maybe not
<wolfspraul>
if not, then we need to send another one...
<kristianpaul>
lets wait
<kristianpaul>
will be the first package i fail to receiver, hope not
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<antoniodariush>
wpwrak, hi, if "dmesg | grep at86rf230" does not return anything in the nanonote, does this mean that the kernel is not configured for the atben?
<blogic>
"lsmod | grep at" ?
<antoniodariush>
blogic, nothing
<blogic>
then i would assume that the image lacks atben support
<blogic>
does xiangfu have access to target/linux/xburst in the owrt repo ?
<blogic>
it seems weird that i need to merge this for him
<jivs>
wpwrak, is IEEE802154_DRIVERS same as PACKAGE_kmod-ieee802154 . I don't see any package with ieee on its name in my toolchain
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<wpwrak>
jivs: i don't know how those packages translate to kernel config options. but there is also a CONFIG_IEEE802154, so chances are that CONFIG_IEEE802154_DRIVERS and PACKAGE_kmod-ieee802154 are not the same
<qi-bot>
[commit] Werner Almesberger: m1/BUILD-CHEAT-SHEET: updated for new RTEMS patch and local changes (master) http://qi-hw.com/p/wernermisc/9343b61