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2014-06-25 04:15 <kyak> wpwrak: where?
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2014-06-25 06:44 <jaime_lion> anyone in here wana do a devils advocit thing and debate about the future of computer repair?
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2014-06-25 08:12 <wpwrak> kyak: argh. i'm getting old ... here it is: www.infobae.com/2014/06/24/1575461-video-viajo-mas-80-kilometros-un-gato-la-suspension
2014-06-25 08:31 <kyak> wow
2014-06-25 08:32 <kyak> i know rats often get under the car's hood
2014-06-25 08:32 <kyak> poor thing.. it looks exactly like my cat
2014-06-25 08:32 <kyak> doesn't look like it's a street can either
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2014-06-25 08:32 <kyak> s/can/cat
2014-06-25 08:32 <qi-bot> kyak meant: "doesn't look like it's a street cat either"
2014-06-25 08:34 <wpwrak> it's amazing that it survived that ordeal, apparently unharmed. well, i think there's a place it'll be very careful to avoid in the future :)
2014-06-25 08:36 <kyak> they speak very intelligently
2014-06-25 08:36 <kyak> not a swear word! :)
2014-06-25 08:36 <wpwrak> wow :)
2014-06-25 08:37 <kyak> i'm kidding, surely
2014-06-25 08:38 <kyak> amazing cat
2014-06-25 08:39 <kyak> i would keep it to myself
2014-06-25 08:39 <wpwrak> for all i know, they could have been reciting dostoyevsky ;-)
2014-06-25 08:40 <wpwrak> (keep the cat) the way the guy was cradling the cat had a hint of possessiveness to it
2014-06-25 08:40 <kyak> it's a pity you don't know Russian, their language is very "vivid"
2014-06-25 08:40 <wpwrak> and yes, it's a cute one. and you won't find one with a more amazing story easily
2014-06-25 08:41 <whitequark> kyak: ... "their"?
2014-06-25 08:41 <whitequark> oh
2014-06-25 08:41 <whitequark> nevermind
2014-06-25 08:41 <kyak> whitequark: of those guys, i mean :)
2014-06-25 08:41 <kyak> "у него морда шире моей"
2014-06-25 08:42 <whitequark> lol
2014-06-25 08:44 <kyak> i mean, this video can easily be splitted into quotes
2014-06-25 08:46 <wpwrak> "his muzzle my wider"
2014-06-25 08:48 <kyak> "his mug (muzzle, snout?) is wider than mine"
2014-06-25 08:49 <wpwrak> hah, so that one was guessable :)
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2014-06-25 10:02 <astr> what sort of leds do smartphones camera flash use?
2014-06-25 10:15 <astr> I'm trying to find a stereo 3.5mm jack socket that has a switch? so normally with no jack in socket it is connected to speaker amp when jack connected speaker amp disconnected
2014-06-25 10:23 <astr> hmm food for thought http://en.qi-hardware.com/wiki/Audio
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2014-06-25 12:41 <wpwrak> btw, is anyone familiar with things like jQuery and the connections between CSS and Javascript ? i'm trying to make "fancy" pop-up things with image maps
2014-06-25 12:42 <wpwrak> astr: (jack) jacks with switch should be easy to find. they may not switch the signal directly, but you'd want some processing anyway. e.g., turn the speaker amplifier on or off.
2014-06-25 12:43 <astr> wpwrak, yea, I was wonder how to switch the amp on/off when not in use to save power
2014-06-25 12:43 <astr> s/wonder/wondering/g
2014-06-25 12:43 <qi-bot> astr meant: "wpwrak, yea, I was wondering how to switch the amp on/off when not in use to save power"
2014-06-25 12:44 <astr> s/was/have been/g
2014-06-25 12:44 <qi-bot> astr meant: "wpwrak, yea, I have been wondering how to switch the amp on/off when not in use to save power"
2014-06-25 12:46 <apelete> Hi larsc
2014-06-25 12:47 <apelete> larsc: is it possible to know exactly how full the mmc fifo is before each transfer ?
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2014-06-25 12:48 <apelete> I was thinking about setting ".dst_maxburst = fifo_capacity - fifo_actual_usage"
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2014-06-25 12:48 <apelete> fifo_capacty is 16 words
2014-06-25 12:49 <apelete> but I don't know if there's a way to know fifo_actual_usage (how full it actually is)
2014-06-25 12:50 <apelete> according to datasheet, there are only status registers for fifo_full, fifo_empty and fifo_almost_full
2014-06-25 12:52 <apelete> and dma trigger level is fifo_half_capacity
2014-06-25 12:53 <apelete> larsc: but I would like to set dst_maxburst so that mmc fifo bandwith usage is alway optimal, ie dst_maxburst = fifo_size - fifo_current_usage
2014-06-25 12:54 <apelete> (replaced 'capacity' with 'size', and 'actual' for 'current' in the first fomula)
2014-06-25 12:57 <wpwrak> astr: the switches usually switch to GND. so add a pull-up and you have a nice digital signal you can use for all the rest. in some designs, you'll also have multiple amplifiers, which you'd switch according to the scenario.
2014-06-25 12:58 <astr> wpwrak, thx
2014-06-25 14:07 <larsc> apelete: typically half the fifo size is a good idea
2014-06-25 14:07 <larsc> but there might be a configurable threshold
2014-06-25 14:08 <larsc> apelete: try to find out at which level the mmc controller triggers a dma request
2014-06-25 14:08 <larsc> probably its when the fifo is almost full
2014-06-25 14:23 <apelete> "The DMA trigger level is 8 words, that is to say, the DMA read trigger is when data words in
2014-06-25 14:23 <apelete> MSC_RXFIFO is >= 8 and the DMA write trigger is when data words in MSC_TXFIFO is < 8.
2014-06-25 14:23 <apelete> larsc: so mmc controller triggers a dma request when the fifo is half full/empty
2014-06-25 14:24 <larsc> ok, maxburst should be 8
2014-06-25 14:24 <larsc> because you know there are at least 8 samples in the fifo
2014-06-25 14:24 <apelete> yes, I was hoping this can be dynamically configurable like I said before
2014-06-25 14:25 <apelete> but it seems not. I'm going to settle with 8 then (it's a pity)
2014-06-25 14:26 <larsc> it is probably ok
2014-06-25 14:26 <apelete> i did some benchmark yesterday with maxburst = 8, didn't notice any improvement
2014-06-25 14:28 <larsc> the bottleneck might be somewhere else
2014-06-25 14:29 <apelete> yeah, I'll try to run perf on the code, don't know if it's possible on the ben
2014-06-25 14:30 <apelete> larsc: at least we're booting 2x faster now with dma, and CPU usage is also slightly lower
2014-06-25 14:30 <larsc> one thing you can do is process multiple transfers at once
2014-06-25 14:31 <larsc> that should help speeding things up
2014-06-25 14:31 <apelete> you mean configure dma to process multiple trasnfers at once ?
2014-06-25 14:33 <apelete> larsc: is that multiple block read/write vs. single block read/write mode ?
2014-06-25 14:36 <larsc> what you do right now is <prepare 1><transfer 1><prepare 2><transfer 2<
2014-06-25 14:36 <larsc> while you could do prepare 2 and transfer one in paralell
2014-06-25 14:37 <larsc> the mmc framework has support for this
2014-06-25 14:41 <apelete> larsc: nice. I don't remember seeing anything like that in other drivers, will take a look to see how it's done
2014-06-25 14:42 <pcercuei> with chained descriptors, you could even program all transfers beforehand
2014-06-25 14:42 <larsc> you still need to program the transfers
2014-06-25 14:48 <apelete> larsc: do you know any driver that does mutiple transfers at once ?
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2014-06-25 15:00 <apelete> hmm, seems like mmci.c is doing it, not sure though
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2014-06-25 15:14 <larsc> any driver implementing the pre_req and post_req callbacks
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2014-06-25 15:26 <apelete> ok, thanks
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