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
<qi-bot>
[commit] Werner Almesberger: m1/BUILD-CHEAT-SHEET: updated RTEMS version and added synthesis hints (master) http://qi-hw.com/p/wernermisc/df09557
<qi-bot>
Jon Phillips: Jane from @qihardware is taking orders for handknit nanonote cases. Anyone interested? Here's mine! http://t.co/xb9ZyB36 ( 175915985738543104@rejon - 47s ago via Ping.fm )
<rejon>
whoa, fast!
<viric>
mh
<viric>
I've troubles in my PC. Awaking from suspend, the sound does not work anymore if there was any program with the sound card opened
<viric>
there should be a trick for that, but I don't know
<Ayla>
IIRC that's a known problem with ALSA
<viric>
but some people have some scripts that solve that, no?
<viric>
called at suspend time and awake time
<viric>
maybe the alsa-lib version would improve something?
<viric>
I'm using alsa 1.0.23...
<Ayla>
doubt it
<qi-bot>
Jon Phillips: @sharism the workshop went quite well! Great attendance, most people interested in @milkymistvj + @qihardware + HTML5 :) buy a mm1 anyone? ( 175927686634545153@rejon - 18s ago via web )
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<DocScrutinizer>
isn't that quite obvious that ALSA card's hw config will get lost on suspend?
<DocScrutinizer>
card gets config'd on snd_pcm_open() done in app
<DocScrutinizer>
I guess there is no easy or feasible at all way to suspend a PCM stream
<Ayla>
it works with OSS4
<DocScrutinizer>
well, probably as there's nobody taking care to change audiocard's initial setup to something app / pcm-stream specific
<DocScrutinizer>
anyway the concept of suspend is inherently wrong for mobile handheld
<DocScrutinizer>
simply because there's only one system-global suspend
<DocScrutinizer>
while on embedded mobile you want to "suspend" even sub-blocks of the CPU as soon and often and long as possible
<DocScrutinizer>
that's why you got dozens of power domains and hundreds of clock gates on contemporary SoC
<DocScrutinizer>
and static registers al over the place
<Ayla>
Linux has a run-time suspend feature, which suspends the unused stuff
<rjeffries>
wpwrak yes I was responding to that not eon the mail lit by wolfspraul
<rjeffries>
s/not/snote
<qi-bot>
rjeffries meant: "wpwrak yes I was responding to that snote eon the mail lit by wolfspraul"
<rjeffries>
s/snote/note
<qi-bot>
rjeffries meant: "wpwrak yes I was responding to that note eon the mail lit by wolfspraul"
<rjeffries>
no I do not have $400 to spare to ship one to China. But this indeed is an interesting fertile field
<wpwrak>
yeah. it's about time camera technology goes beyond those ancient concepts. it's kinda obvious once you hit a difficult scene where you realize that there's enough information to make a decent image. so why does the technology not allow it.
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<whitequark>
DocScrutinizer: you here?
<whitequark>
a question about the yesterday circuit
<whitequark>
what should I do with AGND of the modules?
<whitequark>
err, it is marked AGND on the pinout, but is actually connected directly to the common ground plane underneath the module pcb.
<whitequark>
so, probably nothing...
<DocScrutinizer>
indeed, I'm here
<DocScrutinizer>
you should NOT connect the two GND levels of the modules
<DocScrutinizer>
or connect them with 4mm^2 wire
<whitequark>
well, I have a pretty wide ground polygon running over my breadboard
<whitequark>
and I took the thickest wire I had to connect the modules to GND
<whitequark>
oh, I might have passed the UART through optocouplers. :/ okay, this variant of the design will be GND-coupled.
<whitequark>
another thought
<whitequark>
I only have one power source (batteries)
<whitequark>
the GNDs would be connected anyway
<DocScrutinizer>
the classic recommendation regarding GND in analog is: get a *star* topology, with center next to most sensitive input of the circuit
<DocScrutinizer>
by all means avoid GND loops
<whitequark>
hm
<whitequark>
DocScrutinizer: my (novice) "attempt" at "laying it out" http://imgur.com/sEqoS
<whitequark>
where did I manage to screw it up?
<whitequark>
the bottom half is almost finished (it's finished in the sense of power/gnd connections)
<whitequark>
the upper will be exactly the same
<rz2k>
its MTS simcard?
<whitequark>
yep
<rz2k>
wonder where on our superfamous radio market you found gsm modules
* rz2k
thought that that place is dead
<DocScrutinizer>
umm, well if that's 2 GSM modules, then where is the heatsink?
<DocScrutinizer>
btw I don't see any layput on that component side shot
<DocScrutinizer>
layout*
* DocScrutinizer
wonders what nasty kind of spy equipment this device will become when it's finally working. Call relay?
<DocScrutinizer>
bomb trigger? with hot standby/redundancy design?
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<rz2k>
probably some security system
* rz2k
already forgot what whitequark said to him about that thing
<DocScrutinizer>
re heatsink: you'd get away with this if you'd define it only registers and sends / rcvs SMS. But you asked for hooking up voice audio, which makes me ask "where do you dissipate the heat of the TX power stage?"
<whitequark>
DocScrutinizer: well, that's a why I called it "layout". it's a solderful breadboard, and the wires you see are almost all on the board (there's one wire underneath it which connects the VDD of the bottom module)
<whitequark>
(spy equipment) call relay.
<whitequark>
for civilian use, that is... no, seriously. its usage may be immoral, but definitely not unlawful
<DocScrutinizer>
whitequark: you ever looked into the opportunities of extremely directional high-gain GSM antennae, paired with GSM ME that knows to do register to a particular BTS only?
<whitequark>
mhm. actually not. this opens up some opportunies, but I don't quite get its relation with my circuit
<DocScrutinizer>
Nokia 6210 is such a device, it allows - in monitor/engineering mode - to set CID to SIM phone storage #33 (IIRC) and then registers *only* to that BTS
<DocScrutinizer>
while intelligent BTS *could* still tell distance to ME by TA value, they usually don't
<whitequark>
(heatsink) oh, I did not know they would be so hot. then I'll probably get unconductive thermal paste and attach the heatsiks on the bottoms of the modules (exposed). they're mounted to the pcb with hot glue
<DocScrutinizer>
read the application notes and DS of your module, it has advice re heatsink
<whitequark>
oh, you sure don't understand _why_ do I need that device:) the reason is actually somewhat stupid. er, I'd rather tell in PM
<DocScrutinizer>
if it's related to billing/plans, I'm not really interested - I know all the potetial usecases ;-D
<whitequark>
nope
<DocScrutinizer>
no you got me hooked
<DocScrutinizer>
now*
<wpwrak>
i guess it's for those critical minutes between calling in the bomb threat and leaving the city :)