#beagle IRC Log on BeagleBoard.org

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IRC Log for 2012-04-26

Timestamps are in UTC.

[00:00:11] * lostf (808abd1a@gateway/web/freenode/ip.128.138.189.26) has joined #beagle
[00:00:36] <lostf> does anyone know how to use uart1 through the sys filesystem?
[00:01:06] <mru> what do you want to do?
[00:01:39] <lostf> use uart1 to recieve data from a cpld
[00:01:55] <mru> why not use /dev/ttyO0 or whatever it maps to?
[00:02:09] <mru> that's how you normally use a uart
[00:05:36] <lostf> i've never done it before
[00:05:49] * userx (~0x@unaffiliated/userx) Quit (Read error: Connection reset by peer)
[00:05:58] <lostf> do you just pipe to dev/ttyO0 to write?
[00:06:02] <lostf> and cat to read?
[00:06:12] * userx (~0x@unaffiliated/userx) has joined #beagle
[00:06:21] <mru> you need to configure the right parameters first
[00:06:24] <mru> like bitrate
[00:06:39] <lostf> how do you do that?
[00:07:44] <mru> stty
[00:07:55] <mru> if you want a command line tool
[00:08:13] <mru> man termios for the C interface
[00:08:36] <lostf> thank you
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[00:26:03] <CanyonMan> these xbee units work amazingly well
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[00:49:46] <ppotera> Anyone feel like answering a newbie git question?
[00:49:54] <mru> shoot
[00:49:55] <ppotera> How would I grab this tree? http://dominion.thruhere.net/git/cgit.cgi/linux-omap/tree/?h=nishant-github/linux-omap-3.0
[00:50:06] * prp^2 is now known as prpplague
[00:50:34] * phantoxeD (~destroy@a95-92-89-24.cpe.netcabo.pt) Quit (Ping timeout: 245 seconds)
[00:50:36] <mru> click the summary tab
[00:50:42] <mru> there's a clone url at the bottom of the page
[00:51:21] <ppotera> um um, where exactly?
[00:51:43] * mranostay hands mru a beer
[00:51:45] <mru> right under the 'Clone' heading
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[00:52:09] * Crofton (~balister@pool-71-171-22-246.nwrknj.east.verizon.net) Quit (Read error: Connection reset by peer)
[00:52:42] <ppotera> Ah, under the "summary"
[00:52:44] <ppotera> Cheers!
[00:52:49] <mranostay> ppotera: http://bit.ly/ISF042
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[01:57:06] <JohnVenture> Hello
[01:57:49] <JohnVenture> Does anyone know if the beagloboard-XM supports UHS-I or UHS-II SD cards?
[01:58:34] <JohnVenture> I am trying to improve performances, but the only info I've found on the net is that "apparently the SD card reader supports 4 bits"
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[02:38:56] <vanity> uhs-1 speed is not supported by the H/W (in my case, omap4 hsmmc comtrller)
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[02:40:57] <vanity> omap4 hsmmc controller support up to 24MB/s in high speed sd
[02:42:38] <prpplague> vanity: techincally the pll will go up to around 68MHz, but that feature set requires a lot of careful programming and lots of planning for your sd signals
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[02:52:48] <vanity> i didn't think that far. hmm.. Can hsmmc controller support 68Mhz in 4-bit h/w interface?
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[03:05:26] <nemik> oh man i wish that PyBBIO library did interrupts
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[03:17:19] <jeshwanth> Anybody interfaced Android with beaglebone using Bluetooth ?
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[06:25:02] <cwraig> trouble connecting beaglebone via putty over mini usb any help?
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[07:46:18] <hehIII> hi Im new to the Beaglebone and Cloud9. I have a fresh image and wanted to run the demo blinkled.js. When I attempt to run it I get an Error: Cannot find module '/var/lib/cloud9' anyone else seen this?
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[08:21:57] <aholler> hmm, exodus?
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[08:25:45] <Russ> I know, its really quiet today
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[08:29:46] <_av500_> gm
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[08:36:25] * koen reads up on hwmon
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[08:37:54] <Russ> you don't need it to interact with other drivers, do you?
[08:38:03] <aholler> do you want to add the adcs to it?
[08:38:33] <koen> I'm exploring ways to make the battery cape more "intelligent"
[08:38:38] <koen> e.g. adding a INA219
[08:39:03] <koen> there's a thread on the lm-sensors list about changing hwmon sysfs layout
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[08:39:13] <koen> triggered by someone writing a ina219 driver
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[08:39:59] <koen> what I actually want is to have such a cape hook into the power subsystem (or whatever makes userspace recognize it as a batter)
[08:40:15] <koen> so I start with reading up on hwmon :)
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[08:41:01] <koen> aholler: but you're right, I do want to 'export' AIN8 to a power related subsystem to mark it as "current measurement"
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[08:41:37] <koen> and I found out I'm completely ignorant on how that stuff is done in the kernel and userspace :)
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[08:42:13] <aholler> less Documentation/power/00-INDEX
[08:43:15] <koen> right
[08:43:24] <koen> aholler: I have implemented this already: http://dominion.thruhere.net/koen/angstrom/beaglebone/0001-beaglebone-connect-batterycape-GPIO-to-gpio-charger.patch
[08:44:22] * koen <3 gpiolib
[08:44:22] <aholler> eh, no dt
[08:44:43] <koen> the DT capable kernel for bone lacks mmc support
[08:44:47] <koen> so it's useless for me
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[09:18:00] <_tasslehoff_> koen: I get "PowerVR device not found" from /usr/bin/ES3.0/pvr2d_test. Can that be the heisenbug at work?
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[09:23:31] <koen> _tasslehoff_: I get the same
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[09:26:27] <koen> _tasslehoff_: TBH I'm note sure if that is supposed to work at all, since there's no 2d hardware in the pvr :)
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[09:27:03] <koen> _tasslehoff_: I just got of the phone with _roger_ and we hope to schedule some sgx work next week if time permits
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[09:30:27] <_tasslehoff_> koen: ok. how can I check if I have the same issue you do? I'm trying to run the demos and get this http://pastebin.com/Y9xHnHJv. No X server running, but the demos don't need that?
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[09:56:57] <koen> _tasslehoff_: check powervr.ini
[09:57:10] <koen> if that says front or flip then you have the same issue
[09:57:20] <koen> if that says X11, change it to FRONT or FLIP
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[09:58:48] <_av500_> not FLOP
[09:59:22] <aholler> -ELOP
[09:59:28] <_tasslehoff_> koen: same issue then (WindowSystem=libpvrPVR2D_FRONTWSEGL.so.1)
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[10:12:44] <koen> _tasslehoff_: use ${PV} instead of 1.3.8 in the SRC_URI, remove the PR = r0 and move the srcuri hashes between SRC_URI and S
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[10:21:38] <_tasslehoff_> koen: will do.
[10:22:24] <koen> _tasslehoff_: on, and install -m 0755 instead of cp in do_install
[10:27:06] <_tasslehoff_> koen: ok. did "on," mean anything?
[10:29:30] * _tasslehoff_ needs to find a good intro to git send-email
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[10:55:19] <mru> _tasslehoff_: tried the man page?
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[11:02:56] <_tasslehoff_> mru: yep. my send-email didn't heed the --subject prefix I fed it, but when I prefix in format-patch all is well
[11:03:04] <_tasslehoff_> --subject-prefix
[11:03:25] <mru> send-email mostly accepts format-patch options
[11:03:59] <zhivko> Hi - I am now on ubuntu and beaglebone, i2cdetect seems to detect all device But when I try to open i2c from c++ program, open() function returns < 0 (ERROR)...
[11:04:28] <zhivko> Has anybody some clue what could be wrong? Same code works perfectly on angstrom
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[11:09:33] <zhivko> mru can you help ?
[11:09:52] <mru> no
[11:10:12] <zhivko> that was pretty .. uhmmm...
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[11:13:46] <mru> sorry, I don't know how i2c works
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[11:37:58] <zhivko> I was positively surprised when I saw ubuntu 11 on beagle includes drivers for rtl8192cu
[11:38:27] <zhivko> Butt it looks it behaves as AccesPoint
[11:39:26] <zhivko> and "sudo ifconfig wlan0 down" just takes and takes too long...
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[11:52:25] * mdp tries to accept that A5 bone still has flaky phy support
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[12:42:47] <niro> hi, can anyone tell me why this is happening? /bin/sh: can't access tty; job control turned off
[12:44:39] <zhivko> I canot bring i2c to 400 kHz - I tried with: i2c_bus=2,400 - hows that ? From dmesg: omap_i2c omap_i2c.3: bus 3 rev2.4.0 at 100 kHz
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[12:45:07] <zhivko> av500: Helo are you there ?
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[12:45:41] <mru> talking smtp now, are we?
[12:46:11] <florian> :-)
[12:46:40] <niro> lol
[12:46:45] <av500> zhivko: 250
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[12:54:16] <niro> Ok, I have files with no file modes whatsoever, is this a normal thing?
[12:54:24] <niro> I'm starting to question myself
[12:55:07] <mru> sorry, we can't help with existential conundrums here
[12:56:20] <niro> heh
[12:56:55] <aholler> 42
[12:57:25] <aholler> easy ;)
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[12:58:54] <niro> well, it seems my entire rootfs was corrupt
[12:58:56] <mdp> I have doubt
[12:59:05] <niro> so it explains the days of issues that i've been having
[13:00:48] <zhivko> av500 : what 250 ?
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[13:01:43] <zhivko> So they give us drystones and than BB runs i2c on 25kHz - great ;)
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[13:03:35] <av500> then change it
[13:04:54] <av500> and yes, i2c_bus=2,400 should do that
[13:04:59] <ogra_> add water to make it wet stones ?
[13:05:13] <av500> zhivko: bus 2 or 3?
[13:05:31] <zhivko> bus 3
[13:05:39] <zhivko> av500: bus 3
[13:06:04] <zhivko> av500: I already change it and I am saying it is not working!
[13:06:35] <zhivko> av500: there is no effect. I use ubuntu got from RobertNelson prebuilt image
[13:07:44] <zhivko> av500: I keep getting: [ 1.469635] omap_i2c omap_i2c.3: bus 3 rev2.4.0 at 100 kHz
[13:08:07] <zhivko> av500: an then I check on oscilloscope and it's 25kHz - GREAT !
[13:08:09] <aholler> and you are root?
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[13:11:19] <zhivko> av500: PING ?
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[13:14:20] <zhivko_> av500: have I miss something :)
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[13:17:05] <zhivko_> av500: PING ?
[13:17:26] <av500> yes my dear?
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[13:49:29] <zhivko_> av500: you think I am making something wrong with that uEnv.txt or it should work? has anybody reported running i2c on 400kHz ?
[13:49:50] <av500> pastebin a full boot log
[13:51:02] <av500> koen: "The SCREEN Phenomenon"
[13:51:05] <av500> creepy
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[14:28:26] <rory> hi, why do you have to use a usb hub between a usb device and the BB?
[14:28:55] <smplman> power
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[14:31:54] <aholler> rory: you don't have to
[14:32:09] <Mojito> I have plugged things directly into the BeagleBone. Works fine
[14:32:19] <lpi> hi all, to change muxing of the omap, have I just to type commands "MUX_VAL(CP(MCBSP3_DX), (IEN | PTD | DIS | M4)) /*GPIO_140*/\" decribbed here? http://elinux.org/BeagleBoardPinMux
[14:32:26] <Mojito> As long as you are powering it with the full power input, not the microusb
[14:33:04] <rory> what if I am powering it with the microusb what kind of effects would that cause?
[14:33:09] <aholler> lpi: don't confuse source code with commands
[14:33:27] <lpi> ok so I have to modify the source code of Uboot and recompile it, right?
[14:34:08] <aholler> the kernel will set the muxing again, so changing it in u-boot won't help
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[14:35:36] <lpi> So it's more simple to use omap_mux function of the kernel?
[14:35:38] <Mojito> I think the microusb input does not provide enough milliamps. The power-management chip slows down the CPU and may disable power to the main USB port - I am not sure about that
[14:37:06] <rory> well I am powering it with microusb and have a usb device plugged in (Arduino with a LCD attached to that) and it all works ^^, but the communication from the BB to the Arduino is extremely slow, I was wondering if a lack of power could be hte cause
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[14:40:11] <aholler> no
[14:40:20] <lpi> aholler: me?
[14:40:25] <aholler> no
[14:40:45] <ogra_> no ?
[14:41:03] <aholler> lpi: I can't decide whats more simple for you
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[14:41:54] <lpi> aholler: Anyway, I have either to recompile Uboot or the kernel, isn't it?
[14:42:32] <aholler> lpi: should I quote myself?
[14:43:29] <aholler> I know I don't always write correct english, but most if it should be understandable
[14:43:38] <av500> barely
[14:43:58] <aholler> fuzzy helps
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[14:45:19] <aholler> so a lack of power will change the mux ;)
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[14:46:20] <lpi> I understood, but I just want to know mux my pin. The wiki doesn't mention kernel compilation
[14:47:22] <lpi> + how to
[14:47:24] <aholler> a wiki isn't the answer to live, the universe and everything
[14:47:29] <rory> how can I find out why the serial communication is so slow (how to fix it)?
[14:47:36] <av500> define slow
[14:47:41] <aholler> s/live/life/
[14:47:47] <lpi> ok so what can I do if I'm beginner?
[14:48:05] <lpi> no wiki, no irc? just mailing list then?
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[14:49:35] <siegen> lpi: what you want to do?
[14:50:09] <aholler> some thing just aren't easy. I don't know how to change pin muxing (by hand waving or similiar easy stuff).
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[14:50:41] <lpi> Barely basic: just to blink a LED. The problem is that it doesn't work with /sys/class/gpio technic. So I guess the muxing isn't good, and I'm trying to change it
[14:51:10] <siegen> you can pin mux in two ways through u-boot or kernel
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[14:51:50] <lpi> I know that, but aholler said it useless to change it with uboot because when the kernel is booting, it override muxing
[14:52:13] <siegen> thats not totally true, i think
[14:52:24] <rory> Well I set the baudrate to 9600, but I'm lucky to send 1 integer per second
[14:52:25] <siegen> depend which pins
[14:52:29] <lpi> anyway, the best solution is to use kernel module, right?
[14:52:54] <lpi> Witn this method, I can change every pins on the expansion bay
[14:54:09] <siegen> i needed to pin mux to get spi working and i had success modifying u-boot source
[14:54:33] <av500> rory: sorry, dont understand
[14:54:37] <av500> 9600 is 9600
[14:54:49] <av500> if the other side is slow to respond, thats anothert issue
[14:55:29] <lpi> siegen: my final goal is to use SPI in fact. So how do you say which pin aren't modified by the kernel?
[14:55:59] <lpi> -say + know
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[14:56:19] <siegen> but i think kernel modifies pins if CONFIG_OMAP_MUX is set it up in kernel config
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[14:57:59] <lpi> Ok, I haven't any "omap_mux" in my /sys/class folder, so the module you're talking about is not installed?
[15:00:55] <siegen> in the kernel config in the same section where you can set up that option you can enable some debugging about pin mux which will printk info about which pinmux is done by kernel
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[15:11:21] <lpi> siegen: thank you very much
[15:11:24] <sjbtk> Hello everybody! I am having trouble making changes in the driver modules delivered to my board. I can change the defconfig file and recompile, and I do see the changes reflected in the defconfig in the build tree, but deploy does not seem to see any changes and the 'new' kernel has the same drivers as before. What am I doing wrong?
[15:11:55] <XorA> /sys/kernel/debug/omap_mux is essential reading
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[15:17:45] * XorA wonders why pmount is so difficult for people, or maybe there is a new ubuntu branded keyboard with sudo key
[15:17:49] <mdp> XorA, except the omap-isms in the mode output can be disorienting if they expect it to match am335x padconf regs
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[15:18:43] <XorA> mdp: the mode is the most essential information and thats a number 0-7 :_D
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[15:19:01] <mdp> depends on what you're doing :)
[15:19:48] <mdp> the omap specific output parse is useless
[15:19:58] <mdp> damn those ti people
[15:21:22] * XorA is outnumbered by them
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[15:22:19] <sjbtk> now I am trying -cf deploy
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[15:25:58] <sjbtk> 'bitbake -f virtual/kernel -c deploy' still returns 'Attempted 393 tasks of which 393 didn't need to be rerun and all succeeded.'
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[15:27:00] <aholler> that bitbake stuff is just usefull to install a preconfigured kernel. for everything else git clone a kernel.
[15:27:21] <sjbtk> So even though 'compile' sees work to do, and the work seems related to what i did, deploy does not.
[15:28:22] <thurbad> why not use -f -c compile then?
[15:28:45] <thurbad> followed by -c deploy
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[15:29:34] <sjbtk> I did use -f on the compile but i do not know if it was really needed.
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[15:38:08] <sjbtk> <aholler> your answer went over my head. I used git clone to get the Angstrom distribution of course but you are saying that i should what, clone this and then stop using bitbake?
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[15:45:04] <aholler> clone the kernel and just don't use bitbake.
[15:46:27] <aholler> most of the linux world does it so
[15:46:48] <aholler> s/so/this way/
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[15:49:20] <aholler> at least people which want to modify the kernel or the kernel-comfig
[15:49:51] <ogra_> the others use ubuntu :)
[15:50:17] <av500> ubuntu has no interest in the kernel
[15:50:27] <sjbtk> you are talking about going back to the base kernel and starting from there, abandoning Angstrom and Openembedded?
[15:51:01] <ogra_> av500, ubuntu users usually dont ...
[15:51:06] <abelloni> I have the solution to my issues with the kernel
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[15:51:38] <aholler> sjbtk: no, angstrom has somewhere the patches and maybe even a git-repo. it's just just well hidden to not destroy our running gag #1
[15:51:42] <abelloni> basically, the kernel built by Angstrom is not working on some beaglebones
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[15:52:01] <abelloni> I took the sources from koen kooi and now it is working ...
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[15:54:56] <jeshwanth> hey guys how to clone this kernel ? https://github.com/koenkooi/linux/tree/beaglebone-3.2
[15:56:57] <jeshwanth> I did https://github.com/koenkooi/linux/tree/beaglebone-3.2
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[15:57:01] <thurbad> did you try clicking on the "Git Read-Only" button near the top left ofthe page?
[15:57:18] <thurbad> then put git clone in front of the link it gives
[15:57:55] <jeshwanth> but getting error as fatal: https://github.com/koenkooi/linux/tree/beaglebone-3.2/info/refs not found: did you run git update-server-info on the server?
[15:57:55] <jeshwanth> anybody please help me
[15:58:21] <aholler> hack the server
[15:58:24] <thurbad> jeshwanth... I just answered you
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[16:04:40] <zhivko_> rory, av500: I notified slow i2c running on 35 kHz instead on 400 Mhz ?
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[16:06:14] <zhivko_> meant 25kHz instead of 400kHz :)
[16:08:18] <thurbad> zhivko_: you can specify the speed of each i2c bus when you bring it up... in the board file
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[16:09:13] <zhivko_> thurbad: Yes I tried to do that but in dmesg it keeps telling me it runs on 100kHz
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[16:09:44] <av500> you still have not pasted a full boot log
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[16:11:25] <jeshwanth> hi
[16:11:57] <XorA> the i2c thats wired to DVI slot is fixed at 100Khz I think
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[16:16:13] <zhivko_> avr500: you mean me?
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[16:16:52] <koen> XorA: the pico dlp gets upset with >100kHz
[16:17:14] <XorA> koen: I read the comments so I know this :-D
[16:17:28] <koen> :)
[16:17:37] <XorA> also sending i2c fast over 10m of cable does not work
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[16:19:56] <av500> zhivko_: yes
[16:20:03] <zhivko_> at least setting: i2c_bus=2,400 in uEnv.txt should work ? isn't it true ?
[16:20:27] <zhivko_> av500: you mean to paste whole dmesg here ?
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[16:20:53] <zhivko_> I'm afraid some bot will kick me out beacause of spam :)
[16:21:07] <zhivko_> ubuntu@omap:~$ dmesg | grep i2c [ 0.099131] omap_i2c.1: alias fck already exists [ 0.110812] omap_i2c omap_i2c.1: bus 1 rev2.4.0 at 100 kHz [ 1.489265] omap_i2c.3: alias fck already exists [ 1.494429] omap_i2c omap_i2c.3: bus 3 rev2.4.0 at 100 kHz [ 2.035838] i2c /dev entries driver
[16:21:59] <aholler> dpaste.org
[16:21:59] <zhivko_> xorA: that's i2c on bus 0 I think? yes ?
[16:22:06] <aholler> full log
[16:22:13] <XorA> zhivko_: my memory aint that good
[16:22:31] <av500> zhivko_: of course not
[16:23:08] <zhivko_> I can send yyou dmesg on private message - ok ?
[16:23:24] <av500> no
[16:23:29] <av500> [18:21:59] <aholler> dpaste.org
[16:23:34] <av500> or pastebin
[16:24:24] <ogra_> since you seem to be running ubuntu... sudo apt-get install pastebinit; dmesg|pastebinit
[16:24:45] <ogra_> and post the url this returns
[16:24:52] <zhivko_> http://dpaste.org/nOD1b/
[16:25:08] * stuk_gen (~quassel@151.65.14.50) Quit (Remote host closed the connection)
[16:25:17] <aholler> zhivko_: read lin 18
[16:25:47] <aholler> (after enabling wordwrap)
[16:26:04] * Crofton (~balister@pool-71-171-22-246.nwrknj.east.verizon.net) Quit (Read error: Connection reset by peer)
[16:26:10] <zhivko_> you mean: Built 1 zonelists in Zone order, mobility grouping on. Total pages: 65024
[16:26:16] <aholler> no 19
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[16:26:47] <aholler> 18 without wordwrap
[16:26:54] <zhivko_> you mean: Kernel command line: console=ttyO0,115200n8 vram=12MB omapfb.mode=: omapdss.def_disp= root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait fixrtc ip=none
[16:27:43] <aholler> yes
[16:27:49] <zhivko_> So this means what? It will not take into account uEnv.txt ?
[16:28:10] <aholler> paste your uEnv.txt
[16:28:27] <aholler> not here
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[16:28:45] <koen> aholler: do you have the latest version of your led patch online, or should I just get it from patchwork somewhere?
[16:28:51] * b7500af1_ (~b7500af1@LLPROXY.LL.MIT.EDU) Quit (Client Quit)
[16:29:15] <zhivko_> http://dpaste.org/BbUDj/
[16:29:23] <aholler> koen: v4 is on lkml
[16:29:41] <Crofton|work> damn it, I need to bother b7500af1
[16:29:45] <aholler> that disables the heartbeat on panic too+
[16:29:46] <Crofton|work> ah
[16:30:00] <Crofton|work> b7500af1, free the codes!
[16:30:38] * XorA (~XorA@slimlogic.co.uk) Quit (Ping timeout: 240 seconds)
[16:30:59] <mdp> let my codez go!
[16:31:07] <aholler> zhivko_: use optargs=i2c_bus=2,400
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[16:31:29] <aholler> zhivko_: see mmcargs=...
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[16:31:45] <aholler> that is what ends up in the kernel cmdline
[16:32:27] <b7500af1> Crofton|work, soon enough.. give me another couple months.
[16:33:01] <Crofton|work> it is ok, you can use a public repo
[16:33:06] <sjbtk> so no, -f is not needed by bitbake compile to see my changes to defconfig and run do_compileconfigs. except for the deploy, everything works as koen says. clean, update defconfig, compile, deploy. only deploy seems to 'fail'g,
[16:33:08] <b7500af1> heh, nah, I should be done in a week or so. I think. (I always under estimate how long it will take.)
[16:33:08] <Crofton|work> we will not make fun of you :)
[16:33:29] <zhivko_> aholler: so i need to update line with mmcargs ?
[16:33:34] <zhivko_> aholler: like that: mmcargs=setenv bootargs console=${console} ${optargs} vram=${vram} omapfb.mode=${defaultdisplay}:${dvimode} omapdss.def_disp=${defaultdisplay} root=${mmcroot} rootfstype=${mmcrootfstype} ${device_args} i2c_bus=2,400
[16:33:39] <Crofton|work> we are just concerned you will get busy with new adventures and not quit "finish"
[16:33:44] <aholler> zhivko_: no
[16:34:22] <aholler> zhivko_: read that line and think about what $(optargs) there is used for
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[16:35:26] <zhivko_> aholler: so this should be ok than: optargs=i2c_bus=2,400 mmcargs=setenv bootargs console=${console} ${optargs} vram=${vram} omapfb.mode=${defaultdisplay}:${dvimode} omapdss.def_disp=${defaultdisplay} root=${mmcroot} rootfstype=${mmcrootfstype} ${device_args}
[16:38:05] <aholler> http://26-26-54.hardwarebug.org/30
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[16:39:22] <cwhat> can someone help with uart programming on beaglebone
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[16:49:19] <zhivko_> so an empty optargs (optargs=) in uEnv.txt could help some people ;)
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[16:54:53] <aholler> i wonder why you have all the other stuff, like mmcargs, in uEnv.txt
[16:55:36] <aholler> zhivko_: and an empty optargs would not help, you haven read mmcargs too ;)
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[17:16:21] <_av500_> reading is overrated, amazon sells steel now
[17:16:39] <mru> metal!
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[17:17:17] <_av500_> mru: dont trigger the sandtroll
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[17:18:44] <aholler> they have sold only plastic before?
[17:20:33] <_av500_> and paper
[17:20:49] <mru> no rock or scissors?
[17:21:32] * djlewis looks on amazon for Jack Daniels black label :)
[17:22:09] <mru> JD is the plastic of whisky
[17:22:25] <_av500_> mru: americans....
[17:23:29] <djlewis> i like that "its been in the wooden barrel a long time", after taste :)
[17:23:43] <mru> define a long time
[17:23:57] <mdp> even though it's the budweiser of whiskies???there's still that insane demand from yuropeens to consume it
[17:24:11] <mru> chavs...
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[17:27:40] <jeshwanth> Hey guys, In beaglebone if I want to access pwm driver I have to read the files again and again, this will take more processor time right ?
[17:29:30] <mdp> reading files consumes cpu cycles, yes
[17:29:55] * phantoxe (~destroy@a95-92-89-24.cpe.netcabo.pt) Quit ()
[17:30:48] <jeshwanth> ya but is there any other way to overcome this ?
[17:31:35] <jeshwanth> because I am writing an user space application for pwm in this it always reads analog input and writes to pwm .
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[17:34:04] <Crofton|work> http://cheezburger.com/6154773504?siteId=75
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[17:42:49] <mdp> Crofton|work: incredibly accurate, of course
[17:43:41] <Crofton|work> yes
[17:43:43] <Crofton|work> ask koen
[17:43:48] <mdp> hrm, I left him on hold in the level 2 customer support call center for too long
[17:43:57] <mru> and canada is North Texas?
[17:44:06] * mdp closes the support ticket
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[17:46:19] * koen only visits TX and cA
[17:46:34] <koen> and trying to get approval for the NY OSHW thing
[17:46:39] <koen> so yes, accurate :)
[17:47:28] <mdp> I do resent the fact that it places me in TX???boo
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[17:49:41] <mdp> koen, I have an eye on that one too.
[17:49:54] <emeb> Texas has some fine distinctions - I'm in West TX apparently.
[17:50:16] <aholler> so CA?
[17:50:41] <emeb> Or East CA according to the map...
[17:51:18] <emeb> I know some Oregonians who'd resent being lumped into CA.
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[17:53:20] <mdp> emeb, I am highly pleased the CA and NY are segregated
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[17:53:48] <emeb> mdp: But there's only 1 state between them!
[17:54:06] <mdp> that's the "real america" state I think :)
[17:56:17] <emeb> As lauded in this classic: http://en.wikipedia.org/wiki/Beers,_Steers,_and_Queers
[17:58:43] <mdp> yes, never forget that line from FMJ
[18:00:29] * pilu (~prsahoo75@180.215.37.176) has joined #beagle
[18:01:29] <djlewis> Crofton|work: lol
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[18:01:44] <mru> emeb: css fail on wikipedia
[18:02:35] <wmat> mru: canada is like north Texas but with better beer
[18:02:53] <emeb> mru: works for me. you must have bad internets.
[18:03:27] <mru> emeb: don't you get a huge, empty space under the 'original album' heading?
[18:03:31] * kvarley (~kevin@unaffiliated/kvarley) Quit (Quit: Leaving.)
[18:03:53] <emeb> mru: nope - track listing.
[18:04:01] <mru> yes, _then_ the track listing
[18:04:21] <mru> the 'professional ratings' table in the right margin is too wide and pushes the track table down
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[18:04:59] <emeb> mru: looks like about 1 char height space to me. Maybe browser dependent? I'm using Chrome.
[18:05:14] <mru> browser depedent is fail
[18:05:21] <emeb> nod
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[18:08:01] * Russ (foobar@ip68-106-254-4.ph.ph.cox.net) Quit (Ping timeout: 246 seconds)
[18:08:20] <emeb> Anyone recommend a debugger that supports ARM SWD?
[18:08:30] <emeb> Only one I know is Blackmagic Probe.
[18:09:11] * sjbtk (434e2f0e@gateway/web/freenode/ip.67.78.47.14) Quit (Ping timeout: 245 seconds)
[18:09:38] <emeb> Doing some Cortex M? work lately and the ST Discovery boards + OSS drivers are failsauce.
[18:10:58] <aholler> http://sourceforge.net/apps/trac/libswd/
[18:13:04] <emeb> thx
[18:13:13] <aholler> so it looks like openocd already supports it
[18:13:36] <emeb> hard to say. I've seen conflicting info about openocd + swd.
[18:16:05] <aholler> http://www.olimex.com/dev/ARM/JTAG/ARM-JTAG-SWD/ARM-JTAG-SWD-schematic.pdf
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[18:17:03] <aholler> doesn't look like swd has less pins ;)
[18:17:51] <emeb> actually it does. Only 3 pins really needed. clk, bi-dir data & gnd.
[18:18:31] <ds2> that's 1 more wire
[18:18:45] <mdp> like spy-bi-wire
[18:19:12] <emeb> ds2: one more wire than what?
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[18:20:07] <ds2> spy-bi-wire
[18:20:26] <ds2> take that back
[18:20:28] <mdp> ds2, I think he was comparing to jtag
[18:20:29] <ds2> you counted ground
[18:20:36] <mdp> ds2, right :)
[18:21:21] <ds2> ground is always implied
[18:21:22] * tasslehoff (~tasslehof@145.79-161-31.customer.lyse.net) Quit (Ping timeout: 252 seconds)
[18:21:27] <emeb> maybe gnd doesn't count. hard to be successful w/o it though.
[18:21:31] <ds2> otherwise, SPI becomes 4 wires and I2C becomes 3 wires ;)
[18:21:56] <mdp> emeb, it makes for better marketing
[18:22:01] * Russ (foobar@ip68-106-254-4.ph.ph.cox.net) has joined #beagle
[18:22:07] <djlewis> though a bit decieving
[18:22:11] <ds2> emeb: by that line of reasoning, you should also include power
[18:22:15] <emeb> good thing marketers don't do actual design.
[18:22:15] <ka6sox> its "assumed"
[18:22:27] <ds2> like the ez430's connector is 4 pin for the most basic one
[18:22:42] <mdp> they need wireless h/w debug???even 1 wire is too many :)
[18:22:56] <emeb> "using only the power of my mind..."
[18:23:03] <ka6sox> even that is deceiving...its really 2 wires.
[18:23:05] <mdp> emeb, s/marketers/markeTEERs/
[18:23:38] <ds2> I wonder if RFids have a RF debug interface ;)
[18:23:45] <mdp> ka6sox: yep, very fast and loose in those product glossies
[18:24:27] <emeb> mdp: I hear they make a tasty candybar.
[18:25:22] <mdp> emeb, filled with a mystery substance known only as, "nougat" :P
[18:25:29] <ds2> imagine people remotely debugging your RFid creditcard ;)
[18:25:49] <emeb> ds2: imagine people remotely debugging your pacemaker or insulin pump.
[18:26:05] <ds2> that's being done ;)
[18:26:06] * mdp adjusts tinfoil hat
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[18:26:11] <koen> emeb: watch karen sandlers "unchain my heart" talk
[18:26:48] <koen> emeb: first documented attacks on pacemakers were published last year
[18:27:32] <ds2> but pace makers have a power source
[18:27:32] <emeb> koen: shades of David Lynch/Dune/Harkonnen heartplugs.
[18:27:37] <ds2> credit cards don't
[18:28:16] * emeb buys tinfoil wallet
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[18:28:42] <ds2> now consider public transportation ;)
[18:29:15] * kiilo (~kiilo@modemcable096.222-163-184.mc.videotron.ca) Quit (Ping timeout: 260 seconds)
[18:29:21] <jsabeaudry> Is the presence of ehrpwm in the sysfs tree dependendant on a kernel config? (they seem to come and go very other version)
[18:30:07] <ka6sox> Or Orwell...
[18:30:09] <jsabeaudry> People are on a hurry
[18:30:18] <jsabeaudry> Can't wait for an answer
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[18:31:28] * ka6sox is now known as zz_ka6sox
[18:32:28] <jsabeaudry> My favorite Orwellian moment is when amazon deleted 1984 from all the kindles
[18:32:50] <jsabeaudry> so priceless
[18:34:35] <emeb> Meta FTW.
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[18:51:01] <mdp> jsabeaudry: what exactly is your observance with ehrpwm coming and going?
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[18:52:04] <ds2> maybe it is also applying PWM to the kernel versions
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[18:54:38] <mdp> jsabeaudry: in your EDMA travels did you ever try the am335x EDMA test app by chance? I can't recall if you had mentioned such a thing
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[18:59:26] <orated> Hello! I've a question on Y-cable. I see that reference manual instructs to use OTG port on BB as a primary source for power in the section where it describes HS USB2.0 OTG Port. It also mentions about Y-cable for additional power. Will it work if I connect one end of Y-cable to BB, other end to USB port on system and remaining end to a USB female to female adapter to run USB 2.0 hub?
[19:02:02] * cacodaemon (~abaddon@178.121.205.145) Quit ()
[19:02:28] <_av500_> orated: nope
[19:04:10] <orated> av500: 'coz both the USB A port in the Y-cable are only for power, no data?
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[19:08:51] * Russ (foobar@ip68-106-254-4.ph.ph.cox.net) has joined #beagle
[19:09:17] <zhivko> aholler: just for the record - to raise speed of i2c to 400kHz modify uEnv.txt like: i2cspeed=3,400 mmcargs=setenv bootargs console=${console} i2c_bus=${i2cspeed} ${optargs} vram=${vram} omapfb.mode=${defaultdisplay}:${dvimode} omapdss.def_disp=${defaultdisplay} root=${mmcroot} rootfstype=${mmcrootfstype} ${device_args}
[19:10:23] <aholler> no
[19:11:16] * emeb_mac (~ericb@ip72-223-81-94.ph.ph.cox.net) Quit (Quit: emeb_mac)
[19:11:36] <aholler> put "optargs=i2cspeed=3,400" before the line with mmcargs
[19:11:48] * Russ (foobar@ip68-106-254-4.ph.ph.cox.net) Quit (Client Quit)
[19:12:07] <aholler> and cat /proc/cmdline to verify
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[19:14:22] <mdp> jsabeaudry, fwiw, I think koen mention that one PSP release forgot the ehrpwm driver or something like that..and he had to add it in to his tree???probably should use his tree if you aren't already
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[19:17:28] <_av500_> orated: you plug both Y ends into the PC
[19:17:34] <_av500_> and single end into BB
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[19:19:01] * Russ (foobar@ip68-106-254-4.ph.ph.cox.net) has joined #beagle
[19:19:03] <orated> av500: Yes, I know the connections. I just wanted to confirm the reason why the setup I'm trying won't work... is that because the Type A ones in the Y cable are solely for power and not data?
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[19:25:23] <Crofton|work> _av500_, what is the magic google to get your partition tester
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[19:27:39] * Russ (foobar@ip68-106-254-4.ph.ph.cox.net) Quit (Ping timeout: 245 seconds)
[19:28:38] <Crofton|work> got it
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[19:29:23] <arcanescu> http://www.bbc.co.uk/news/technology-17853523 why is this made headlines ive no diea
[19:29:25] <arcanescu> *idea
[19:29:54] <arcanescu> using beaglebone..... can someone accompany me for some meaningless flaming?
[19:31:56] <jsabeaudry> mdp, all my DMA stuff is working now, but no I did not see the am335x edma test app, although I have seen one for another chip
[19:32:23] <jsabeaudry> mdp, yes I'm on his tree, the r10d branch, previously I was on the r6 branch
[19:32:59] <mdp> ok, thx
[19:33:51] <mdp> I had the test app fail on the r6 branch today???locked up tight
[19:34:00] <jsabeaudry> the edma one?
[19:34:41] <mdp> it is the same one from the ti814x page, does many iterations of simple chained mem2mem copies
[19:34:44] <jay6981> arcanescu: i think it's the same guy from #beagle that burned out one of his BBs by putting 5V on gpio
[19:35:41] <arcanescu> jay6981: are you joking ?
[19:35:46] <arcanescu> 5v on gpio ?
[19:35:55] <mdp> jsabeaudry: I was trying it because my co-worker is trying to debug his crypto driver that uses dma???and he said the test driver worked at least
[19:36:16] * gustavoz (~gustavoz@host48.190-138-184.telecom.net.ar) Quit (Quit: Leaving)
[19:36:18] <mdp> jsabeaudry, so I'm amused to see it die for me???I recalled you had things working
[19:36:30] * hubbi (50a458f8@gateway/web/freenode/ip.80.164.88.248) has joined #beagle
[19:36:47] <arcanescu> jay6981: I dont like the concept of the project.... and its in the news..... :/ #
[19:37:11] * hubbi (50a458f8@gateway/web/freenode/ip.80.164.88.248) Quit (Client Quit)
[19:37:14] <jay6981> no, i think it's the same guy from this channel
[19:37:36] <jsabeaudry> mdp, I do get occasionnal lockups but very infrequent im not sure they are related, but even the heartbeat dies
[19:37:40] <jay6981> it made it on the front page of reddit too??? he must have pretty good PR to make bbc
[19:38:03] <arcanescu> do you knwo his nick so i can tell him personally that thing sucks
[19:38:18] <mdp> arcanescu: lol
[19:38:26] <mdp> it has a case around it
[19:38:36] <mru> or against it?
[19:38:40] <mdp> +1 for the case
[19:38:43] <arcanescu> mdp: why lol :(.... i mean "all my DMA stuff is working now, but no I did not see the am335x edma test app" this is more intresting
[19:39:14] <mru> is edma supposed to be hard?
[19:39:19] <arcanescu> yes
[19:39:27] <mru> looks like a bog standard dma to me
[19:39:30] <mru> seen one, seen 'em all
[19:39:31] <arcanescu> is typing a sentence hard ? and getting it printed?
[19:39:43] <jay6981> arcanescu: MattRichardson
[19:40:17] <arcanescu> It might be another issue to get the usb port to work on ur custom kernel to drive the printer or network... but yea ... other than that..... its not even a case
[19:40:24] <mdp> mru, indeed it's similar to other dma engines
[19:40:49] <mdp> except this one has poor driver support..
[19:40:49] * jstearns74 (~jstearns7@70.56.143.241) has joined #beagle
[19:40:59] * Russ (foobar@ip68-106-254-4.ph.ph.cox.net) has joined #beagle
[19:41:06] <mru> who needs drivers when there are mmio registers?
[19:41:31] <mru> just mmap the control regs to userspace and off you go
[19:41:32] <arcanescu> jay6981: Ty ... ill hunt him down...
[19:41:35] <mdp> another starterware user
[19:41:46] <jay6981> haha
[19:42:06] <mdp> mru, map them to userspace to use in a kernel driver? ok
[19:44:41] <mru> oh, if you're already in the kernel you don't even need to do that
[19:44:52] <mdp> hehe
[19:44:53] <mru> just pray nobody else is trying to use it at the same time...
[19:44:59] <mdp> bingo
[19:45:02] <aholler> arcanescu: sounds like you are envious. I find that idea to use the mechanical turk not bad. It's just a bit pricey
[19:45:16] <mdp> do go on???tell me more about why you want to bang on the edma directly in your kernel driver
[19:45:22] * jpirko (~jirka@ip-89-102-207-111.net.upcbroadband.cz) Quit (Quit: Leaving)
[19:45:53] <mdp> oh shit???you just broke the spi driver! :)
[19:45:55] * LetoThe2nd (~jd@178-26-169-86-dynip.superkabel.de) has joined #beagle
[19:46:37] <mdp> now we remember why there are frameworks for these things
[19:47:04] <mru> frameworks are for people with weak discipline
[19:47:11] <mdp> hehe
[19:47:26] * panto feels an urge to bitbang something
[19:47:31] * sohua (bec43815@gateway/web/freenode/ip.190.196.56.21) has joined #beagle
[19:47:34] <mdp> plus, anything that's worthwhile doing can be done by bitbanging gpio
[19:47:53] <mdp> panto, you just wanted to use that word???you've been lurking...waiting
[19:48:07] <panto> yes... yes... yesssss...
[19:48:28] <aholler> use the pru to bitbang usb
[19:48:41] <mdp> panto, "Sparta!"
[19:49:01] * hvaibhav (~a0393758@nat/ti/x-gjydxaqwdiyegmuj) Quit (Ping timeout: 244 seconds)
[19:49:06] <mru> aholler: easier than getting musb to work for sure
[19:49:13] <sohua> hi, i've some questions: the SPI port can trigger a interruption?
[19:49:41] * vpopov (~happylife@46.251.88.46) has joined #beagleboard
[19:49:43] <mdp> aholler, *yawn*???.can you bitbang descriptions of photos from humans with that approach?
[19:50:26] <aholler> depends on the humans
[19:50:39] <mru> energy: 2.1 eV
[19:50:43] * rcf (~rcf@81.243.28.219) Quit (Quit: This war is mine)
[19:50:44] <mru> spin: clockwise
[19:50:44] * RITRedbeard (RITReadbea@t410.student.rit.edu) Quit (Quit: Leaving)
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[19:50:50] <sohua> and the CPU how fast can do math operations, like multiplications and sums with integers?
[19:51:14] <arcanescu> aholler: not at all envious.... mechanical turk.... i mean listen to yourself you are paying someone to basically translate an image.... wat 2$ 1 $ i wouldnt pay for that....
[19:51:42] <aholler> I don't pray, I just don't care.
[19:51:46] * virals (~viral@122.179.32.159) Quit (Ping timeout: 265 seconds)
[19:51:47] <arcanescu> id rather go like hey wait a minute ill go to a room where i would have the image i uploaded myself translate that and send it back to myself
[19:51:48] <mdp> arcanescu: it's groundbreaking :) I only laughed cause you want to stalk him and tell him it sucks :)
[19:52:01] <aholler> journalists are writing all kind of stupid stuff
[19:52:02] <arcanescu> mdp: :D spot on :P
[19:52:25] <arcanescu> yes it is groundbreaking... literally
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[19:53:13] <panto> ok, I'm outta here, cya
[19:53:15] * panto (~panto@195.97.110.117) Quit (Quit: Leaving)
[19:58:32] <aholler> arcanescu: you've read that and even spammed it here. so the journalist won.
[19:59:15] <aholler> and we can await more such groundbraking news
[19:59:58] <arcanescu> aholler: well atleast its giving a message to all other people doesnt matter howworthwhile your stuff is if you know the right people your'e famous
[20:00:14] <arcanescu> incase anyone didnt know
[20:00:25] <arcanescu> *_o
[20:00:32] <aholler> so he knows you?
[20:00:35] * RITRedbeard (~RITReadbe@t410.student.rit.edu) has joined #beaglebone
[20:00:50] <arcanescu> ofcouse not
[20:01:23] <aholler> but you made him famous here
[20:02:00] * GeorgeH_ (~George@c-69-141-105-145.hsd1.nj.comcast.net) Quit (Ping timeout: 260 seconds)
[20:02:54] <aholler> or you both get paid by amazon ;)
[20:03:01] <arcanescu> :]
[20:03:02] <mdp> shills!
[20:03:17] <arcanescu> well im sorry about that that was un intentional
[20:03:49] * emeb_mac (~ericb@ip72-223-81-94.ph.ph.cox.net) has joined #beagle
[20:03:59] <mdp> keep up the good work..perhaps he will drive 500k+ sales of am3358 and I can feed my chilluns
[20:05:08] * davest (~dcstewar@134.134.137.73) has joined #beagleboard
[20:05:14] <Russ> wait, who's famous?
[20:05:26] * sohua (bec43815@gateway/web/freenode/ip.190.196.56.21) Quit (Ping timeout: 245 seconds)
[20:06:23] <mdp> Russ, you can be if you like
[20:06:44] <Russ> I missed out on whatever arcanescu was babbling about
[20:06:46] <mdp> write an article about your project and send it to arcanescu
[20:07:15] <arcanescu> Russ: not babbling
[20:07:19] <arcanescu> fact1
[20:07:27] <Russ> If I had a project that was worth a news story, I'd send it as an elc-e proposal
[20:07:37] <mdp> 3:29
[20:07:37] <mdp> arcanescu
[20:07:37] <mdp> http://www.bbc.co.uk/news/technology-17853523??why is this made headlines ive no diea
[20:08:38] <Russ> right up there with a scrolling led board that has your twitter feed
[20:08:43] <mdp> Russ, I have enough doubt about even elc-e for mine worthiness much less MSM :)
[20:08:50] <Russ> which piece of technology is revolutionary
[20:09:13] <mdp> I need to send them my msp430 with the reed switch monitoring the garage door???.revolutionary!
[20:09:34] <mdp> maybe I could hook it to mechanical turk's api so somebody can call me when I leave it open
[20:09:37] * zz_ka6sox is now known as ka6sox
[20:09:51] * orated (~orated@unaffiliated/sre-su) Quit (Ping timeout: 265 seconds)
[20:10:31] <Russ> mdp, you need an angle
[20:10:56] <Russ> mdp, with a camera, that way, if its just you working in the garage they wouldn't send anything
[20:11:41] * arcanescu (925706ef@gateway/web/freenode/ip.146.87.6.239) Quit (Ping timeout: 245 seconds)
[20:12:09] <Russ> the next big thing, telepresence seeing eye dogs
[20:12:15] * emeb_mac (~ericb@ip72-223-81-94.ph.ph.cox.net) Quit (Quit: emeb_mac)
[20:12:32] <mdp> Russ, submit the BeaconBoard scripts you did
[20:12:50] <Russ> you could setup a huge center with seeing eye dogs that would be tasked out to telepresence bots as needed
[20:12:55] <mdp> Russ, maybe I could pay them for a written description of the mess in the garage
[20:13:07] <Russ> mdp, I don't think that's 50 minutes worth
[20:13:22] <mdp> "It appears that the owner did not clean up after his last 27 projects in the garage"
[20:14:06] <mdp> "There are exposed nails, seems to be a hazard"
[20:15:02] <mdp> Russ, I like that idea???Sheldon-style telepresence devices :)
[20:15:07] * orated (~orated@unaffiliated/sre-su) has joined #beagle
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[20:19:25] <Russ> oh dear god, what a horrible ad choice
[20:19:29] <Russ> http://www.nydailynews.com/life-style/health/swiss-women-dies-giving-water-food-thought-live-sunlight-article-1.1067359
[20:19:30] * borillion (~borillion@adsl-108-67-222-206.dsl.pltn13.sbcglobal.net) Quit (Disconnected by services)
[20:19:41] <Russ> 'WANT TO LOSE WEIGHT? DO THE MATH'
[20:19:45] * borillion (~borillion@adsl-108-67-222-206.dsl.pltn13.sbcglobal.net) has joined #beagle
[20:19:52] * borillion (~borillion@adsl-108-67-222-206.dsl.pltn13.sbcglobal.net) Quit (Disconnected by services)
[20:20:04] <Russ> oh geez, that's a link to a story not an ad
[20:20:07] * borillion_ (~borillion@adsl-108-67-222-206.dsl.pltn13.sbcglobal.net) has joined #beagle
[20:20:32] * siegen (~lechaguin@sign-4db6b02e.pool.mediaWays.net) Quit (Quit: Leaving)
[20:20:59] <mdp> a story that yells
[20:21:28] <mdp> oh Russ, I actually received a rev c xM today
[20:21:43] <mdp> I was so excited except I have no use for it now
[20:21:56] <mdp> maybe 4-6 weeks ago
[20:22:10] * cehh (~carher@nat/ti/x-dbggwniffxocrsau) has left #beagle
[20:24:52] * tema (~tema@178-16-155-142.obit.ru) Quit (Ping timeout: 246 seconds)
[20:25:08] <Russ> finally
[20:25:40] <mdp> http://www.adafruit.com/products/801
[20:26:25] * Phosphate (~Phosphate@c-71-224-169-69.hsd1.pa.comcast.net) Quit (Ping timeout: 250 seconds)
[20:27:06] <Russ> mdp, is your msp430 sensor wireless?
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[20:28:14] <mdp> no, but it on my silly projects roadmap to upgrade it
[20:29:30] <Russ> I have an msp430 usb stick thing laying around, so I ordered an rf transmitter receiver pair from sparkfun
[20:29:37] <mdp> cool!
[20:30:09] <Russ> if it works well, I'm make a wireless remote sensor board with an msp430
[20:30:39] <aholler> ti does sell them
[20:30:52] <Russ> yup, and they are very low power
[20:31:00] <mdp> I started with the cc1100 eval stuff to learn a bit
[20:31:17] <aholler> i mean wireless msp-stuff. isn't that what that clock uses?
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[20:31:33] <mdp> but I'm looking to deploy my various sensor nodes using the $10 cc100 xcvrs from circuit specialists
[20:31:37] <Russ> wireless msp and the clock?
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[20:32:13] <mdp> er, cc1100
[20:32:27] <aholler> ez430
[20:32:51] <Russ> but what clock?
[20:33:00] <aholler> chronos
[20:33:22] <Russ> ah
[20:33:34] <Russ> mdp, what is the expected range on the cc1100?
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[20:35:30] <mdp> I think you can get close to 50m or so with a decent rf design indoors
[20:36:18] <mdp> my intention was to aggregate a few of these on to a beagle* and maybe run a contraption like Syntro???but that's a bit overkill
[20:36:35] <Russ> these things are claiming 500ft range given ideal conditions
[20:36:35] <mdp> I do want to centralize some notification things though
[20:36:37] <Russ> http://www.sparkfun.com/products/10534
[20:36:48] <Russ> but they are one way and don't have fancy framing features or anything like that
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[20:37:18] <mdp> that's in a 500 ft long Tempest test chamber :)
[20:37:23] <Russ> heh
[20:37:26] <Russ> I'll experiment
[20:37:50] <mdp> yeah, all you can do is experiment
[20:37:58] <Russ> the also have something similar to the cc1100
[20:38:00] <Russ> http://www.sparkfun.com/products/10154
[20:38:08] <Russ> rfm22b
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[20:38:17] <mdp> a chip antenna like that makes me "have doubt"
[20:38:30] <Russ> it can take an external antenna
[20:38:50] <mdp> the reason to consider cc1100 is to be able to go mesh too
[20:39:23] <mdp> let all those little low power nodes walk your sensor data back to home base
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[20:39:46] <Russ> but then you need to synchronize sleep/wake cycles
[20:40:13] <mdp> yes, need to have wake events
[20:41:09] <mdp> that's more on the vision side of things for me???today I just need to go back to the aggregator directly
[20:42:28] <mdp> let me know how those work???the price is nice
[20:42:59] <Russ> I've tested them in the 1 inch apart configuration so far
[20:43:14] <mdp> ship it!!
[20:43:20] <Russ> ok, gtg
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[21:01:44] <djlewis> gone an hour and too much beagletalk to catch up on.
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[21:03:46] <mdp> summary: you just need to check out the camera
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[21:08:12] <kusi> hi, has someone ever converted the BBxM OrCAD design to Altium Designer?
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[21:23:47] <zhivko> I thaught I raised speed of i2c to 400kHz, but than I checked i2cdetect with time - and found out it's same result!
[21:24:13] <zhivko> so i2c is still running on 25kHz :(
[21:24:37] <zhivko> aholler: does it sound familiar ?
[21:24:48] * Russ (foobar@ip68-106-254-4.ph.ph.cox.net) has joined #beagle
[21:25:16] <aholler> I don't know anything about i2detect
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[21:25:42] <Russ> what about i2cdetect?
[21:25:43] <zhivko> in dmesg it says it's on 400kHz, but I measured with osciloscope and it's 35kHz - who can help ?
[21:25:56] <zhivko> sorry 25kHz
[21:26:25] <aholler> sounds bitbanged
[21:26:35] <Russ> you sure you are measuring the clock time and not the byte cycle time?
[21:26:48] <zhivko> aholler: how do you mean it ?
[21:26:48] <Russ> (25kHz is 1/16th of 400kHz)
[21:26:51] <djlewis> if the i2c speed is set at post fs boot wont the kernel override that?
[21:27:08] <djlewis> if it is hard coded in...
[21:27:36] <zhivko> I also builded kernel - but I don't know where to look for - in which code...
[21:28:47] <zhivko> djlewis: that would be great - they mention you can set it in uEnv.txt ??
[21:29:09] <djlewis> seems i2c used to default to 100k
[21:30:11] <djlewis> zhivko: perhaps so, I havent used uEnv.txt. I have set it in u-boot but that would be trampled on whatever the fs sets it to.
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[21:31:18] <djlewis> somehow 25k seems "just not right"
[21:31:43] <Russ> zhivko, do you have a screenshot of your scope?
[21:31:48] <zhivko> How can I override this - or where to change it in kernel if I wanna build it?
[21:31:52] <zhivko> russ: yes
[21:32:06] <Russ> can you post it to imgurl or something?
[21:33:22] <zhivko> https://picasaweb.google.com/110230689089207649183/Beaglebone25kHzI2c#5735782372143198978
[21:33:52] <djlewis> cool, another rigol :)
[21:34:03] <zhivko> let's get to the point :)
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[21:34:27] <Russ> can you zoom in so you can see a single transaction more clearly?
[21:34:28] <zhivko> So where is master koen to consult me ;)
[21:34:39] <djlewis> they dont do so good a job freezing fast logic transitions.
[21:34:39] <Russ> and I'm assuming this is clock, not data, right?
[21:35:19] <mdp> jsabeaudry: *sigh* our sample code on the wiki is an epic fail as is the TRM since it shows 4 TCs in the block diagram
[21:35:53] <zhivko> yes it's CLK
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[21:36:34] <mdp> jsabeaudry, the am335x edma driver wiki page links to the sample code written for am387x/ti814x???a part that has 4 TCs whereas am335x only has 3 TCs???
[21:36:42] <zhivko> you wanna data also? isn't it CLK enough to see speed od clk ?
[21:36:59] <mdp> jsabeaudry, trivial fix but sloppy docs :(
[21:37:03] <Russ> that screen shot is looking like 400kHz to me
[21:37:14] <Russ> each division is 20uS
[21:37:33] <Russ> it looks like there are 8 clock cycles per division
[21:37:45] <Russ> so 2.5uS per clock cycle
[21:38:20] <mdp> djlewis: prpplague's hantek hacking has made me have second thoughts about a rigol
[21:38:38] <djlewis> mdp: i havent seen that
[21:38:46] <zhivko> Russ: time will show improvement from 100kHZ to 400kHZ don't you think? it should be 4 times faster - but it didn't
[21:39:13] <Russ> ok, first of all, how are you measuring 25kHz?
[21:39:43] <mdp> djlewis: http://elinux.org/Das_Oszi_Protocol
[21:40:08] <mdp> djlewis: or really, http://elinux.org/Das_Oszi
[21:40:43] <aholler> zhivko: you can use the cursor to measure, similiar to what I've done here: http://ahsoftware.de/ds1307_does_somewhat_work.gif
[21:40:45] <zhivko> do you think lowest clock of both busses overrides ?
[21:41:02] <Russ> I don't think you've reviewed the i2c protocol
[21:41:11] <Russ> how are you measuring 25kHz?
[21:41:21] <zhivko> is this data and clk ?
[21:41:44] <Russ> you told me it was running at 25kHz, then posted a screenshot from a scope that looks like its running at 400kHz
[21:41:50] <Russ> I'm curious where you got 25kHz
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[21:44:48] * Russ wonders where realtors keep finding 'hardwood laminate flooring' and 'laminate hardwood flooring'
[21:45:13] <mdp> "never ever ever confuse marketing with the truth"
[21:46:22] <mru> Russ: the hard wood occurs as they fantasize about screwing the customers with such wordings
[21:46:23] <djlewis> mdp: the guts of the hantek's look so much ike those of the rigols
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[21:46:39] <zhivko> Russ I will produce picture of CLK and DATA
[21:48:11] <aholler> and position the cursors
[21:49:08] <aholler> then you don't need to do the math by yourself
[21:49:30] <mdp> djlewis: yeah, that was the general assessment of people that dissected these units (or any of the other ones that are identical to the hantek)???that they were as good of quality as a rigol???which got me thinking about the openness aspect as a plus
[21:50:16] <mdp> djlewis, I've been holding off getting a decent hobbyist grade DSO like a rigol until I really need it..as my old analog still works
[21:50:41] <mdp> but hackable/extendable is always an attraction :)
[21:51:29] <zhivko> https://picasaweb.google.com/110230689089207649183/Beaglebone25kHzI2c
[21:51:54] <Russ> zhivko, where are you getting the number, '25kHz'
[21:51:55] <aholler> mdp: you get a lcd, case and an arm for 300???
[21:51:58] <aholler> ;)
[21:52:08] <mdp> LOL
[21:52:12] <zhivko> So now you have data as well - and 3 pictures -do you see them all 3?
[21:52:16] <aholler> including tons of buttons
[21:52:27] <Russ> yes
[21:52:29] <Russ> zhivko, where are you getting the number, '25kHz'
[21:53:52] <mdp> aholler, it sounds really bad when you conveniently omit the 1GS/s ADCs and the amps :)
[21:54:06] <zhivko> russ - if you are checking CLK signal it went 4 times up and down in 10us
[21:54:14] <aholler> mdp: I rarely have a use for that, I'm a softie ;)
[21:54:35] <mdp> I also rarely use more than a logic analyzer
[21:54:40] * florian (~fuchs@Maemo/community/contributor/florian) Quit (Quit: Verlassend)
[21:54:47] <mdp> for the dayjob
[21:54:53] <Russ> zhivko, show me your math
[21:56:05] <aholler> zhivko: move the cursors to two spikes of the clock
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[21:56:20] <Russ> aholler, he doesn't need to do that
[21:56:37] <Russ> he just needs to show me how he got from 4 cycles / 10 us = 25kHz
[21:56:39] <aholler> but then the screen would show it.
[21:57:07] <zhivko> so its 1/0.0000025 Hz isn't it ?
[21:58:30] <zhivko> :)
[21:58:56] <Russ> I'd like to think that you just discovered that 4 cycles / 10 us = 400kHz
[21:59:48] <aholler> you mean 100kHZ * 4?
[21:59:48] <zhivko> but why then the time is same when measuring i2cdetect ?
[21:59:58] <mdp> Russ, are we ready to move to lesson 2? differential equations
[22:00:12] <Russ> zhivko, what did you calculate that it would change by?
[22:00:49] <Russ> my math shows that moving up the i2c clock to 400kHz would have a very small effect on your timing since a very small percentage of time is the actual time that data is clocking in/out
[22:01:00] * prpplague is so over the ds1307
[22:01:06] <Russ> or are you just guessing and throwing stuff at the wall
[22:01:23] <prpplague> the ds1307 has so many drawbacks when you consider using it with a low power device
[22:01:38] <zhivko> russ_
[22:01:55] <aholler> prpplague: it could make ti rich ;)
[22:02:02] <Russ> prpplague, ew...it does leap year and stuff
[22:02:14] <zhivko> russ: i woud expect i2cdetect to be 4 times faster on 4 times faster i2c bus
[22:02:25] <Russ> zhivko, then you haven't thought about the problem
[22:02:52] <prpplague> aholler: hehe
[22:02:56] <prpplague> http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en550280
[22:02:58] <Russ> the i2c clock speed only effects the rate at which data is being clocked in and out
[22:03:01] <prpplague> much better solution
[22:03:09] <prpplague> with lots of extra features
[22:03:12] <Russ> zhivko, how many bits are you clocking/
[22:03:15] <prpplague> and super cheap
[22:04:12] <Russ> (8 bits addr + 16 bits data + 1 stop + 1 start) * 3 axis * 3 sensors?
[22:04:14] * kusi (59eca028@gateway/web/freenode/ip.89.236.160.40) Quit (Quit: Page closed)
[22:04:27] <ds2> *yawn*
[22:04:35] <Russ> 234 bits
[22:04:52] <ds2> russ: that math falls apart depending on how the driver is written
[22:05:02] <ds2> <--- been up to eyeballs with sensors :/
[22:05:09] <Russ> ds2, I'm just talking about the portion of the time that data is clocked in/out
[22:05:26] <Russ> ds2, to calculate the time difference for running at 100kHz vs 400kHz
[22:05:39] <ds2> Russ: that is a start but that usually turns out to be such a small portion of measured time
[22:06:03] <prpplague> aholler: ds1307 is around $1.83 is 100qty, the MCP79410 is just $0.79 is same qty
[22:06:12] <prpplague> aholler: and MCP79410 requires no level shifters
[22:06:24] <prpplague> aholler: plus you get eeprom
[22:06:26] <aholler> prpplague: I know, I just used because I have that breakout here.
[22:06:33] <prpplague> aholler: ahh
[22:06:34] <ds2> dallas has a 1.8V RTC
[22:07:00] <prpplague> ds2: with eeprom?
[22:07:09] <ds2> prpplague: no, but with xtal
[22:07:17] <prpplague> hehe
[22:07:20] <ds2> can't find my notes... looked it up last week
[22:07:25] <Russ> so at 234 bits at 100kHz = 2.34ms
[22:07:35] <ds2> eeprom don't matter for what I was looking for. internal xtal was more important
[22:07:39] <Russ> at 400kHz, 0.585ms
[22:07:40] <aholler> prpplague: my next thingy will be that one: http://www.watterott.com/en/MOD-RTC?x30a3c=3554d7b9b9580a231c79685d0bbe67fd
[22:07:47] * sabesto (~sabesto@188.113.107.138) Quit (Ping timeout: 265 seconds)
[22:08:01] <Russ> zhivko, is it running 1.755ms faster?
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[22:08:21] <prpplague> aholler: don't forget to order a few items here - http://www.watterott.com/de/Tin-Can-Tools?x2f390=4c7e5c20c3ad69d2ee19ae6ebfd0b089
[22:08:27] <ds2> prpplague: you wouldn't happen to know of a RTC with on board battery backup, on board xtal, and 1.8V I/O, would you?
[22:08:45] <prpplague> ds2: nope
[22:08:58] <prpplague> ds2: i never really looked for one with onboard xtal
[22:09:08] <ds2> prpplague: why?
[22:09:11] <Russ> you probably want something with on die mems
[22:09:17] <Russ> if it exists
[22:09:32] <ds2> Russ: mems?
[22:09:36] <ds2> for an RTC?
[22:09:39] <prpplague> ds2: we use the xtal on a bunch of projects so we have close to about 100K in stock
[22:09:44] <Russ> http://www.maxim-ic.com/datasheet/index.mvp/id/6861/t/al
[22:10:00] <zhivko> russ: I read 6 bytes from each device each time it is called...which is once every 1ms
[22:10:06] <ds2> prpplague: ah... I was thinking more of mfg costs... more parts == more assembly costs
[22:10:09] <prpplague> Russ: got my purple package today
[22:10:13] <Russ> prpplague, cool
[22:10:23] <ds2> inventory is secondary
[22:10:26] <Russ> zhivko, don't forget start bits, stop bits, and address
[22:10:38] <prpplague> ds2: yea, in this case the inventory offsets the assembly costs
[22:11:02] <ds2> prpplague: *nod* except now you need to keep reels of those 20pf caps around too
[22:11:07] <ds2> and board space for them
[22:11:08] <prpplague> ds2: plus the mcp part is so cheap, and takes the place of a number of components
[22:11:14] * brijesh (~bksingh@nat/ti/x-qmcoyjrdnypnfqpd) Quit ()
[22:11:23] <prpplague> ]
[22:11:25] <zhivko> russ so it's 30bytes max each ms
[22:11:33] <aholler> ds2: that pcf8563 is usable with 1.8v
[22:11:47] <ds2> zhivko: you probally don't want to be poking the sensors at 1000KHz
[22:11:49] <prpplague> Russ: thanks i'll test and talk to rusty
[22:12:06] <Russ> prpplague, I realized after I sent them that I forget esd protection diodes
[22:12:49] <ds2> aholler: that's a hella lot of board space
[22:13:09] <Russ> zhivko, Add in the delay between writing a command and reading back the reply, I don't think you can fit that amount of transfer no matter what you do
[22:13:24] <ds2> got that + xtal + caps
[22:13:48] <ds2> use the onboard fifo's
[22:13:56] <Russ> also, you are reading 6 bytes from each device, do you also need a command and register address byte along with the address?
[22:14:01] <ds2> and poke at it with a burst read at a slower rate
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[22:14:14] <ds2> 1000KHz polled sample rate is going to be painful to get right
[22:14:18] <zhivko> Russ: we are running same code! in mbed without seeing any problems there - but values on beagle are drifting.
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[22:14:29] <Russ> mbed?
[22:14:33] <zhivko> We are reading from IMU
[22:14:39] <Russ> imu?
[22:14:52] <zhivko> Russ: yea ?
[22:15:02] <Russ> yea?
[22:15:30] <ds2> zhivko: why are you insisting on banging your head on the wall?
[22:15:37] <ds2> use the hw fifos
[22:16:45] <Russ> the DS3232M is pretty awesome, too bad it isn't 1.8v
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[22:16:54] <zhivko> ds2 - so you think beagle is not meant to be used to read data from i2c device (so fast) or what? I need subtitles :)
[22:17:22] <ds2> zhivko: I am saying, use the hw that is on the sensors.
[22:17:41] <Russ> only off by around 1 second every 2 days
[22:18:12] <ds2> zhivko: the beagle can do that just fine. I have working drivers on the board. there is no reason to chase what you are chasing down
[22:19:08] <zhivko> ds2: just wanna get where this discrepancies come out comparing mbed and beagle
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[22:19:24] <zhivko> ds2: what do you think I am chasing down ?
[22:19:28] <ds2> Russ: whoa... you really do mean MEMs
[22:19:44] <ds2> zhivko: per sample latency at 1KHz
[22:20:15] <aholler> what drifts?
[22:20:29] <Russ> ds2, we live in the future
[22:20:41] <Russ> what's an mbed?
[22:20:55] <zhivko> russ: google?
[22:21:21] <ds2> Russ: I been mostly working with mics, gyros, accels, etc
[22:21:32] <Russ> zhivko, you are using bone, right?
[22:21:32] <aholler> the mbed runs linux?
[22:21:42] <zhivko> Russ: yes
[22:21:47] <zhivko> aholler: no
[22:21:59] <Russ> the bone has two microcontrollers on it call pru's
[22:22:24] <aholler> zhivko: so how are you able to use the same code on mbed an the bone?
[22:22:34] <Russ> your other option is to instrument the i2c driver in the kernel to analyze what is going on with the timing
[22:22:40] <mdp> Russ, stuff Boris is crazy about
[22:22:55] <Russ> mdp, can Boris get some official looking documentation out for them?
[22:22:55] * av500 (~av500@pd95bf55a.dip0.t-ipconnect.de) has joined #beagle
[22:23:10] <zhivko> So when we read 3 sensors 30 bytes of date each ms, on mbed and we leave imu still - there is almost no drift in angle values (3d angle is what imu measures)
[22:24:08] <Russ> imu?
[22:24:12] <ds2> you are using the Invense chip, right?
[22:24:17] <ds2> or was that someone else?
[22:24:25] <zhivko> If we then run same code (now on 400kHz i2c bus), the values of angles are drifting
[22:24:31] <zhivko> ds2: yes
[22:24:34] <mdp> Russ, Boris is only capable of hitting +1, he's a dog
[22:24:36] * aesbas (52d70b3f@gateway/web/freenode/ip.82.215.11.63) Quit (Ping timeout: 245 seconds)
[22:24:38] <Russ> "drifting"?
[22:24:38] <ds2> then use their software
[22:24:49] <ds2> they have it all written
[22:24:54] <zhivko> IMU = Inertial measurement unit
[22:25:24] <Russ> why not just slow down the sample rate then
[22:25:36] <zhivko> drifting= values are sliding - they are not still... :)
[22:25:47] <Russ> how is that a latency problem
[22:26:10] <ds2> are you building something dangerous that the powers to be would not like?
[22:26:58] <aholler> I would bet something like a quadcopter
[22:27:11] <zhivko> russ: wanna build some stabilizing system.
[22:27:36] <zhivko> russ: and must run fast
[22:28:37] <Russ> if you want to use the in-kernel i2c driver and it isn't meeting your timing expectations, you'll need to instrument it
[22:28:41] * CMoH (~cipi@unaffiliated/c-moh) Quit (Quit: Konversation terminated!)
[22:28:56] <Russ> otherwise, you can use the PRUs
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[22:31:32] <zhivko> ross: mbed has an API that does RAW io and that is only difference - code is same - beagle has linux overhead :)
[22:32:25] <zhivko> Russ: PRUs ?
[22:32:32] <Russ> the microcontrollers on the bone
[22:33:03] <Russ> zhivko, i2c is typically not something where you need 1kHz update times
[22:33:40] <Russ> zhivko, if there needs to be a delay for 1uS, the driver will typically just put a sleep instead of a busywait, which will probably be a 30 some ms delay
[22:33:42] <ds2> Russ: that's why the chip vendors provide fifos
[22:33:56] <Russ> ds2, well you should tell him to check out the hardware fifos
[22:34:02] <Russ> :p
[22:34:11] <ds2> Russ: I have said about 5 times already.
[22:34:12] <zhivko> only difference is execution time since the sensors are going to produce the same values on the beagle, the processor must pass what it sees up through the Kernel to the driver the driver must write to a file and applications reads it
[22:34:20] <ds2> clearly, this person don't want things to work.
[22:34:34] <Russ> zhivko, have you even looked at the i2c section of the TRM or the driver written for it?
[22:34:50] * mrcan_ (~mrcan@unaffiliated/mrcan) Quit (Ping timeout: 260 seconds)
[22:34:54] <Russ> i2c is not complicated and the drivers are not that complex
[22:35:48] <zhivko> Russ: no - sory but if it will solve it I am more that willing to :)
[22:36:16] <aholler> but it doesn't have subtitles
[22:36:33] <mdp> uh oh
[22:36:41] <mdp> and sometimes it's incorrect too
[22:37:02] <Russ> zhivko, you really need to look at what is going on in the driver, or if you are more comfortable with microcontrollers, use the PRUs, they are probably a smart thing to have on a system like your anyway
[22:37:31] <ds2> the whole point of those Invense chips is the hardware handles these problems
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[22:39:47] <zhivko> ds2: - which sample should I check ? itg3205 doesn'have any special functions I think - I mean you can read those 3 *2 bytes and that's it - correct me if I'm wrong please
[22:39:58] <mdp> maybe try starterware instead
[22:40:00] <ds2> zhivko: look at the datasheet
[22:40:12] <zhivko> yea I'm loooking :)
[22:40:23] <ds2> and if you are doing a IMU, you should be really using the MPU3050 part
[22:40:29] <ds2> it should be a pin compatible setup
[22:41:20] <ds2> the MPU3050 has hw to sync samples and do other magic so you don't have to be exactly on the spot with poking at the chip
[22:41:47] <Russ> ah, that's what he means by drift
[22:42:11] <ds2> or go with the MPU6050 with more parts integrated
[22:42:11] <zhivko> ds2: OK you are talking now about another piece of hardware: MPU3050 instead of ITG3205 ;)
[22:42:28] <zhivko> hehe :) or by helicopter ;)
[22:42:42] <ds2> zhivko: you are talking about IMU's so, one would think you are using the hw that is meant for that
[22:43:15] <ds2> otherwise, why bother with the Invense part? there are nicer gyros around
[22:43:26] <zhivko> I bought all 3 sensors in breakout board for 30$ on ebay ;)
[22:43:42] * jannau (~janne@v38276.1blu.de) Quit (Remote host closed the connection)
[22:43:45] <ds2> blah... use decent hw
[22:43:56] <ds2> it is probally $30 on ebay cuz someone f'ed up
[22:44:02] <Russ> you could also use multiple i2c busses
[22:44:06] <zhivko> ds2: OK give me some cost effective solution ;) obviously itg3205 has problem with beagle ;)
[22:44:20] <ds2> regardless what you are doing, you cannot truely sync up things on all 9 axis
[22:44:28] <ds2> it doesn't matter beagle or not.
[22:45:04] <ds2> talk to invense... maybe a MPU6050 + a recommended magnetometer
[22:45:15] <ds2> plenty of options available
[22:45:24] <zhivko> what do you estimate the cost of this combination ?
[22:45:41] <ds2> depends on volume obviously
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[22:46:02] <zhivko> Russ: multiple i2c-s on beagle ?
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[22:46:34] <ds2> i2c is the least of your problems
[22:46:50] <ds2> which magnetometer and accelerometer are you trying to use?
[22:47:13] <djlewis> zhivko: you are tempting me to dig out my old nintendo gyroscope and play.
[22:47:32] <zhivko> adxl345 hmc5883L and itg3200
[22:48:20] <ds2> is that an analog part or a digital out part from ADI?
[22:48:38] <ds2> IIRC, the HMC5883 requires you to request a conversion
[22:48:51] <ds2> so you'll need to sync up the sampling yourself...
[22:48:52] <zhivko> djlewis: it's cool idea - but I currently lack some drystones :) kernel overhead is killing me I mean this mbed - runs on
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[22:50:19] <djlewis> zhivko: i havent seen the mbed code. does it average each read?
[22:50:29] <zhivko> ds2: We have same hardware, same code , only beaglebone replaces mbed - and we have instability in readings ;)
[22:51:03] <aholler> this is getting annoying
[22:51:09] <ds2> it is not the bone
[22:51:20] <ds2> the data just looks less like garbage
[22:51:52] <zhivko> code is on http://code.google.com/p/uav-helicoptor-ece4007/
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[22:52:58] * djlewis wonders it the bone is giving more detailed readings?
[22:53:10] <djlewis> which are correct for that moment in time..
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[22:54:06] <Russ> my bet is that the i2c-omap.c driver is written to minimize cpu usage rather than latency
[22:54:07] <zhivko> how do you mean more detailed ?
[22:54:31] <ds2> there is nothing wrong with the i2c-omap.c driver
[22:54:54] <djlewis> zhivko: looking at: http://aeroquad.com/showthread.php?5191-beaglebone-and-itg3205-problem-%28gyro-values-unreasonable%29
[22:55:07] <djlewis> it looks like you pick it up at the last 5 lines
[22:55:21] <ds2> w/o doing much work, a 80-150Hz sample rate is doable... to go faster, one needs to tune a few things
[22:55:30] <djlewis> +1
[22:55:31] <zhivko> djlewis: ok I solve that already ;)
[22:55:36] <Russ> ds2, he's looking for 1kHz
[22:56:19] <ds2> Russ: I know... I have those gyros and mags working easily at the slower rate. 1KHz is possible but you'll get junk back unless you get the hw to cooperate (hence the MPU3050 suggestion)
[22:56:30] <ds2> Russ: the delays is not coming from I2C
[22:56:36] <Russ> ah
[22:57:16] <ds2> Russ: what's why I was saying your numbers is a start but that's not the bottle neck....to get down to 1KHz, you do need to up the bus speed but that is secondary
[22:57:53] <ds2> IIRC, the mag and gyro might support the high speed I2C bus (higher then 400KHz)...but this is going from what I recall
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[22:59:19] <zhivko> I think 400kHz is max for gyros and mag
[23:00:20] <Russ> also there are two i2c busses brought out
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[23:00:39] <Russ> so one bus to one set of sensors, the other to another
[23:00:52] <Russ> of if you end up using the pru, one pru per bus
[23:01:13] * djlewis is heading home :)
[23:01:15] <zhivko> russ: I have breakoutboard - only one i2c bus
[23:01:21] * djlewis (~djelwis@adsl-65-64-30-13.dsl.ltrkar.swbell.net) Quit (Quit: Leaving.)
[23:01:24] <ds2> *shrug* possible... don't have the public datasheets on hand
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[23:03:01] <zhivko> ds2: what could cause this drifting of data on beagle - do you have some idea ? I see you worked with similar projects in past
[23:03:43] <ds2> zhivko: define "drifting"
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[23:04:01] <Russ> maybe I should submit an elc-e proposal for PRUs
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[23:04:10] <ds2> sample's not matching up btwn the different sensors or?
[23:04:18] <ds2> s/sample's/samples/
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[23:04:48] <zhivko> ds2: no it looks like some error is acumulating and angle is not holding betwin 1 degree when imu is still.
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[23:05:07] <zhivko> ds2: but same algoryth on mbed... I don't have to repeat :)
[23:05:23] <ds2> you probally have problems with your math
[23:05:24] <Russ> ds2, are you also confused why the problem is being presented as being a latency issue and not a read issue?
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[23:05:40] <ds2> zhivko: other obligations prevents me from saying more. sorry.
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[23:06:21] <ds2> Russ: I think I know what is being described.
[23:06:33] <ds2> dead reckoning and it is not integrating to zero when it is not moving, right?
[23:07:40] * rcf (~rcf@81.243.28.219) Quit (Quit: This war is mine)
[23:10:06] <ds2> Russ: have you done anything specific with the PRU?
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[23:26:23] <nemik> sorry for such a noob question, but after running bitbake via "MACHINE=beaglebone bitbake systemd-image", where is the .gz or xz image? or is there some other command to make those?
[23:28:11] <zhivko> I did some i2c bechmark on beagle and I am seeing that for 10 READS it takes 0s 4ms
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[23:28:42] <zhivko> that is LOOONG time
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[23:31:19] <zhivko> russ: when the bus you are running on delivers 1 byte in 2.5us it takes over 100 times longer to deliver the byte to the application than it takes the i2c bus to deliver it
[23:32:20] <zhivko> ds2: do you know how to solve this dead reckoning?
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[23:40:53] <Russ> ds2, not yet, but if I submitted a proposal on it, I'd learn about it or have nothing to present
[23:41:29] <Russ> zhivko, like I said, if you want to figure out why, you'll have to do some digging
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[23:43:16] <zhivko> you mean rewrite i2c_driver ?
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[23:48:44] <ds2> zhivko: yep.
[23:49:15] <zhivko> ds2: can you go a little bit more in detail? pm maybe ?
[23:49:44] <ds2> have obligations that prevent that
[23:49:56] <ds2> there are plenty of guys in that area solving that problem
[23:51:09] <zhivko> ds2: I checked mpu-9150 at: http://video.designworldonline.com/channel/b8c3046087cf4ac39357b3f212cf98cd - and I am start thinking that maybe it's better to buy more integrated solution.
[23:51:49] <ds2> "Available Q2 2012"
[23:52:16] <ds2> most of the MPU line have hardware inside to help and they have sw to help with all this
[23:52:39] <ds2> other vendors have sw to solve this on other chip in general
[23:54:27] <mdp> Russ: that would be a great session
[23:56:00] <ds2> Russ: you got someone to cover travel and lodging for ELC-E?
[23:58:21] <Russ> it'd have to be TI
[23:58:40] <zhivko> ds2 - is there any integrated IMU available already ?

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