**** BEGIN LOGGING AT Mon Feb 20 03:00:00 2012 Feb 20 03:40:41 hello Feb 20 03:44:00 Hello michaelshiloh Feb 20 03:45:36 I'm new here so I'm trying to be polite and spend more time listening than talking, but it seems pretty quiet tonight Feb 20 03:46:10 I'm new here as well and as of yet, for the time I have spent on FreeNode (which is a lot) I have never seen anyone talk in here. Feb 20 03:47:15 well you're SEEING IT NOW Feb 20 03:47:36 omg! Feb 20 03:47:41 Well hello there scromp Feb 20 03:47:55 hey what's up? Feb 20 03:48:01 lol people often talk in here Feb 20 03:48:14 i have just got done soldering a bunch of crap so i'm kind of winding down Feb 20 03:48:22 bringing up my new beagleboardxm. Feb 20 03:48:28 it makes me tense Feb 20 03:48:44 gotta relax those shoulders after soldering Feb 20 03:49:13 it really is the shoulders, isn't it? Feb 20 03:49:50 indeed. especially the fine pitch surface mount stuff. Feb 20 03:51:31 how can i find out what packages are available for installation with opkg? Feb 20 03:59:31 opkg list Feb 20 04:11:52 if you do an opkg upgrade, do you get upgraded to the cutting edge, or do you just get maintenance and security updates? Feb 20 04:26:59 thanks Feb 20 04:27:45 i'm looking for a command line, or at least text based, mail client. Feb 20 04:28:01 half jokingly, should't beagle come with mutt? Feb 20 04:29:40 http://www.angstrom-distribution.org/repo/?pkgname=mutt Feb 20 04:30:17 don't know if that's up to date, but it should be there somewhere Feb 20 04:30:34 i'm in heaven - thanks! Feb 20 04:36:00 and i just found this: python-libgmail which should allow me to do just what i need Feb 20 04:51:22 where is the bootloader config file ? Feb 20 04:57:09 ok it's very different than grub Feb 20 07:19:13 hi Feb 20 07:19:24 what is the amperage at the gpio pins? Feb 20 07:20:16 on the bone? Feb 20 07:20:21 * bones_was_here would also like to know this Feb 20 07:20:22 beagle xm Feb 20 07:20:47 i think i need it to correctly calculate the circuit Feb 20 07:22:40 carli2: there is a data sheet to read Feb 20 07:23:09 av500CDGS: yes, but what to search for? i searched for "amperage", but only one hit. Feb 20 07:23:11 the bone's sheet doesn't seem to mention gpio current Feb 20 07:23:22 i searched for "gpio", but no amperage info Feb 20 07:25:59 the section about the expansion header also does not give any info Feb 20 07:26:34 usually such things are found in the specs section, maximum ratings or sich. and its not called amperage, its called amximum current. see the TRM, not the beagleXYZ manual :) Feb 20 07:27:39 I think OMAP DM, not TRM, contains electrical info Feb 20 07:27:40 the transistor i want to use has an I_B of 20mA. does the beagleboard handle this? Feb 20 07:29:55 :o that's weird, that must be wrong Feb 20 07:35:59 Its the one that says "applications processor" I think Feb 20 07:36:23 Table 2-1. Ball Characteristics Feb 20 07:36:34 "buffer strength (mA)" Feb 20 07:36:56 I have a feb 2009 revision for the omap3530/25 Feb 20 07:38:39 looks like 4mA or 8mA depending on the gpio Feb 20 07:39:24 carli2, either put in another stage, or use a different type of component Feb 20 07:40:03 carli2, is I_B some kind of absolute maximum rating, or the amount of current you actually expect to need? Feb 20 07:40:36 Russ: I want to control a motor and I'm wondering how to calculate the resistors for a circuit containing an npn transistor Feb 20 07:41:11 I would be conservative and assume a drive strength of 2mA Feb 20 07:41:42 Russ: the wires are: gpio-resistor1-base, emmitter-resistor2-ground, motorbattery-motor-collector Feb 20 07:42:48 Russ: the voltage from base to emmiter is 0.8V, and the gpio has 1.8V. how do I calculate R1 and R2? Feb 20 07:44:18 carli2, I don't have time, but its pretty easy to find the equations that let you solve that Feb 20 07:44:41 Russ: yes, but I'm missing some values and I dont know what Feb 20 07:45:29 Russ: or can I use R1=1000kR and R2=100R and it works? Feb 20 07:45:57 plug in the values and find out what the equations say Feb 20 07:46:15 the datasheet should provide any missing information Feb 20 07:46:21 (of the transistor) Feb 20 07:46:33 oO( ask your laboringenieur :P ) Feb 20 07:46:58 I don't know what values in the datasheet are relevant. i never read a transistor datasheet Feb 20 07:47:51 http://en.wikipedia.org/wiki/Bipolar_junction_transistor (check the external links on the bottom) Feb 20 07:53:03 when there is "Base Current Ib=20mA", what does this mean? is that the max amperage or what exactly..... Feb 20 07:53:38 Ic=100mA, but Ie=-100mA. but the equations say Ie=Ib+Ic Feb 20 07:53:50 that makes no sense Feb 20 07:54:43 Russ: there are lots of formulas in the wiki, but none of them uses one of the symbols defined in the data sheet Feb 20 07:54:51 what kind of a motor do you plan to use? Feb 20 07:55:00 wtf Feb 20 07:55:07 what's the Beta? Feb 20 07:55:10 bell-armature motor Feb 20 07:55:16 and what configuration? Feb 20 07:55:39 Molls Ebbers should suffice Feb 20 07:55:40 ds2: what does "configuration" in your context mean? Feb 20 07:55:51 configuration of the transistors Feb 20 07:56:23 carli2, are you looking at maximum ratings? Feb 20 07:57:00 Russ: I want a simple circuit which lets me control the bell-armature motor Feb 20 07:57:16 and I don't have the datasheet of the motor. Feb 20 07:57:47 * LetoThe2nd still smells homework. Feb 20 07:57:54 :o Feb 20 07:58:01 how much current would you like to drive the motor with? Feb 20 07:58:46 what kind of control do you want? does it need to reverse? Feb 20 07:58:58 and how are you handling braking/reverse emi? Feb 20 07:59:02 ds2: I don't know. I have a motor from a heli and I want the motor to work. it dosen't need to reverse Feb 20 07:59:23 prehaps you should find out Feb 20 07:59:23 one npn connected to a gpio for controlling a motor, well that's doomed Feb 20 07:59:45 I braking = echo 0 > /sys/class/gpio/gpio139/value Feb 20 07:59:45 won't work and will break your beagle Feb 20 08:00:14 how should I do it correctly? Feb 20 08:00:22 really depends on the motor Feb 20 08:00:35 the motor is made for 3V Feb 20 08:01:26 very small motor with thin leads? i.e. small currents? Feb 20 08:01:36 the diameter of the motor is <2mm Feb 20 08:01:53 ok, that's small :) Feb 20 08:02:07 3mm, sorry Feb 20 08:03:16 a piezo motor perhaps? Feb 20 08:03:35 no, bell-armature Feb 20 08:06:25 i drawed a circuit Feb 20 08:06:43 http://botwars.tk/motor.png Feb 20 08:07:03 the GPIO is on the left site Feb 20 08:07:15 the motor should get a own power supply Feb 20 08:07:26 and I need to calculate R1 and R2 Feb 20 08:08:12 if you don't know much about motors and transistors, just get an h-bridge chip Feb 20 08:08:14 this is the transistor: http://www.produktinfo.conrad.com/datenblaetter/150000-174999/155785-da-01-en-TRANSISTOR_BC547B_TO92.pdf Feb 20 08:09:23 would a operational amplifier help, too? Feb 20 08:09:34 carli2, you need to learn to read datasheets, since you don't seem to be familiar with "absolute maximum ratings" Feb 20 08:10:00 http://www.sparkfun.com/tutorials/223 Feb 20 08:10:04 transistors are fine fuses Feb 20 08:10:05 :) Feb 20 08:10:05 seems that those bell-armature motors are so small that almost anything will do for driving those Feb 20 08:10:32 Russ: I know. but how to learn? the stuff i learned in university was never deep enough to build such things on my own Feb 20 08:10:38 ds2: they are also nice fireworks sometimes :) Feb 20 08:10:56 carli2, there are plenty of guides on the internet for learning how to read a datasheet, and vendors have them too Feb 20 08:11:54 http://www.analog.com/static/imported-files/rarely_asked_questions/moreInfo_raq_datasheet.html Feb 20 08:12:15 this stuff is really easy to find if you are looking and will give you a whole lot of power to do things Feb 20 08:12:20 http://botwars.tk/motor.png <- are there some values for R1 and R2 I can use that cannot break the beagleboard? Feb 20 08:12:40 get a spice model and just try different values til it looks right Feb 20 08:12:43 and do R1, R2 have to be that exactly? Or can they differ? Feb 20 08:13:40 that is not recommended if you want to have it work for long. Feb 20 08:14:00 back emf needs to be accounted for Feb 20 08:14:30 do I have to know more about the motor than that it's not made for voltages above 3V? Feb 20 08:15:05 you generally want to know how much current it needs Feb 20 08:15:24 I could measure it. Feb 20 08:15:30 then you figure out if you have enough gain so you can determine if you need a darlington Feb 20 08:15:44 you need the peak value Feb 20 08:16:42 the darlington looks easy. it only has one resistor. Feb 20 08:17:56 well, the GPIO has 1.8V or 0V; what exactly can break the beagleboard? (the motor will get it's own batteries) Feb 20 08:18:59 carli2: i would use a fet rather than a bjt for that Feb 20 08:19:31 carli2, back emf Feb 20 08:20:42 Ceriand|desktop: GPIO to gate, drain to ground, source to motor, motor to power supply; does this work? Feb 20 08:20:58 carli2: a motor isn't quite working like a plain resitive load Feb 20 08:21:22 carli2: use a n-fet, source to ground, drain to motor, motor to +3V Feb 20 08:21:36 are we talking about a motor something like this? Feb 20 08:21:38 http://www.sol-expert-group.de/Zonne-motoren/Zonne-motoren/::599.html?XTCsid=003c41ae7adeba88c9563593dc898c74 Feb 20 08:21:54 adj: correct. Feb 20 08:22:12 carli2: and if the back-emf you're expecting is too large for the body diode in the fet, use an external diode Feb 20 08:23:56 15 mA for starting current and the diameter of that is double than yours? Calculate R1, move R2 to the collector side and experiment with the value of R2 :) Feb 20 08:24:40 and add a diode across the motor Feb 20 08:32:02 Ceriand|desktop: http://botwars.tk/motor2.png <- is that correct? Feb 20 08:33:50 transconductance is a little less clear then beta Feb 20 08:34:14 carli2: looks ok, if you're planning on pwm'ing the motor, I'd add a series resistor to the gate of the fet to limit the current from the BB Feb 20 08:36:10 Ceriand|desktop: http://botwars.tk/motor2.png Feb 20 08:40:01 Ceriand|desktop: the resistor should not matter that much, dosen't it? I'll take 1kΩ. so I'll buy the diode, the resistor and the n-fet :) Feb 20 08:40:48 carli2: yea, you only really need it if you're doing pwm, and it doesn't have to be too big either Feb 20 08:40:59 Ceriand|desktop: I want to do pwm ;) Feb 20 08:41:17 1k will probably be ok Feb 20 08:41:18 with a gpio? Feb 20 08:41:21 well, what happens if it's too big? 100Ω should work, too? Feb 20 08:41:36 av500 there are three GPIO that have pwm, too. Feb 20 08:41:49 carli2: check the datasheet for the max current Feb 20 08:41:53 (but I didn't find the folder in /sys/class to control it Feb 20 08:42:20 Ceriand|desktop: the n-fet has treshold voltage min 0.8V, max 3.0V. that should fit the GPIO's 1.8V Feb 20 08:42:23 carli2: for hw pwm you'll need to get/write a kernel module if you're using linux Feb 20 08:42:39 carli2: right Feb 20 08:42:54 carli2: make sure the Rds_on is low enough for your application at 1.8 Vgs Feb 20 08:43:03 Ceriand|desktop: nah, /dev/mem will do :) Feb 20 08:43:21 arent there driver files for the timers? Feb 20 08:43:36 carli2: there was a GSoC project for a kernel pwm driver, dunno how far it got though Feb 20 08:46:28 Ceriand|desktop: it was usable afaik Feb 20 08:46:43 http://elinux.org/BeagleBoardPWM Feb 20 08:47:02 Ceriand|desktop: are you sure that source has to go to ground? the data sheets tell me the other way around Feb 20 08:47:05 ah, and it does /dev/mem :) Feb 20 08:47:57 ah no, that is not the GSOC Feb 20 08:48:08 here is the gsoc:http://elinux.org/BeagleBoard/GSoC/2010_Projects/Pulse_Width_Modulation Feb 20 08:48:12 proper kernel module Feb 20 08:49:19 carli2: http://www.electronics-tutorials.ws/transistor/tran_7.html Feb 20 08:55:15 well, the motor needs at least 16 khz to do proper pwm. so I should rather use hw pwm. or do you thing, the scheduler is exact enough to allow a 16khz pwm? Feb 20 11:09:55 Hi Everyone! Has anyone ever tried to control a USB Relay from linux command line? Feb 20 11:10:42 not yet, we're still busy getting down on metaquestions. := Feb 20 11:11:10 eagle: anyone ever? Feb 20 11:12:05 LetoThe2nd: you did anything with DMX512 yet? Feb 20 11:12:12 (I guess you did of course) Feb 20 11:12:30 av500: lots, but not on linux Feb 20 11:13:01 LetoThe2nd: I fail to understand why a usb2dmx is more than $10 Feb 20 11:13:10 one FTDI and one 485 tx Feb 20 11:13:22 and one 120ohm R Feb 20 11:13:49 I have the relay at /dev/ttyUSB0, and i tried use this command: echo -e '\xff\x01\x01' > /dev/ttyUSB0 Feb 20 11:13:54 but doesnt work Feb 20 11:14:03 av500: not because of the hardware, probably because of the lower numbers. its not completely plain rs485 IIRC Feb 20 11:14:15 it says its rs485 electrical Feb 20 11:14:32 eagle: does it work on your linux PC? Feb 20 11:14:59 av500: electrical, yes. but there was something with some control line or switching off bus voltage... lmgtfy Feb 20 11:19:19 av500: see the timing diagram at http://www.soundlight.de/techtips/dmx512/dmx512.htm, section daten. i think getting the timing right including markers was why its not just byte-oriented rs485. Feb 20 11:19:36 but might be alzheimer, of course. Feb 20 11:19:44 LetoThe2nd: 485 does not define bytes Feb 20 11:19:47 as I understand it Feb 20 11:19:52 only electrical Feb 20 11:20:41 av500: yes, but when you use a standard ftdi as the uart, it will behave byte-oriented :) Feb 20 11:21:03 LetoThe2nd: yes, but I plan to use the bitbang mode :) Feb 20 11:21:29 av500: banging bits hard & fast should work AFAIK :) Feb 20 11:21:43 LetoThe2nd: I guess that means no std dmx sw will work with my contraption :) Feb 20 11:22:00 I will have vendor lock-in :) Feb 20 11:22:13 hrhr Feb 20 11:23:14 LetoThe2nd: btw, cheap LED PAR any good? Feb 20 11:23:32 av500: cheap LED PAR good, usually. Feb 20 11:23:54 PAR56 in most cases. Feb 20 11:24:10 what do the numbers mean anyway? Feb 20 11:24:47 type of lightbulb, AFAIK. like the GU stuff for consumer lights. Feb 20 11:25:00 ah Feb 20 11:25:12 I will look for LEDs with 56-type socket :) Feb 20 11:25:27 but became a synonym for size and shape of the par can. Feb 20 11:26:24 av500: http://en.wikipedia.org/wiki/Par_can#Diameter Feb 20 12:14:26 * av500 loves shopping free samples at TI website Feb 20 12:20:18 PARxx is diameter in 1/8 inch Feb 20 12:20:39 * jannau still has a expensive usb2dmx Feb 20 12:21:16 schau schau Feb 20 12:26:11 but it has iirc a micro controller to hold the scene Feb 20 12:29:01 hrm Feb 20 12:29:09 can't find my ip2dmx thing Feb 20 12:29:26 that had a usb port as well Feb 20 12:29:56 found it, it has an atmega Feb 20 12:31:26 but the receivers already "hold", no? Feb 20 12:31:54 av500: no, not necessarily. Feb 20 12:32:16 they go dark if they are not updated periodically? Feb 20 12:32:17 av500: usually the controller just writes out cyclic as fast as possible. Feb 20 12:32:26 av500: many go dark, yes. Feb 20 12:33:11 LetoThe2nd: I had to 'optimize' light setups in the past Feb 20 12:33:22 by keeping the addresses close Feb 20 12:33:39 e.g. 1, 2, 3, 4 is 8x faster than 1,2,3,32 Feb 20 12:33:41 koen: ipv6 ftw.... Feb 20 12:33:56 give each led on the planet and address Feb 20 12:34:00 koen: yes, because the controllers just write out one bulk from the first to thze last used address... Feb 20 12:34:12 LetoThe2nd: what else can they do? Feb 20 12:34:20 you cannot skip addresses, no? Feb 20 12:34:24 hence - less gaps, more speed. Feb 20 12:35:16 av500: they could just write out the few bytes to each device separately. but not sure if dmx supports that anyway. IIRC the packet always starts with address 0 or 1 Feb 20 12:36:36 so it cannot be done Feb 20 12:36:56 might be. not sure. Feb 20 12:40:01 koen: mumbling about a new meta-openembedded/meta-initramfs layer to host klibc + class + related static recipes. Thoughts? Feb 20 12:40:34 I'd even add kexecboot and linux-kexecboot there Feb 20 12:45:04 ant_work: sounds like a good idea Feb 20 12:45:29 ant_work: we could even move that to the oe-core repo (not layer) later on Feb 20 12:46:32 koen: ok, great. I'll send a msg to the list with the proposal and some patches. Thx. Feb 20 13:44:35 hi i'm planning to buy beaglebone.I have some doubts : 1. Does ethernet cable is provided in the kit. 2.Is there any differences in ethernet cables. If yes which one should be used Feb 20 13:45:19 No, yes, it has auto-mdix so every cable should work Feb 20 13:46:11 so it will work even with standalone PC, Feb 20 13:46:29 network is not required ?? Feb 20 13:48:32 ? Feb 20 13:51:02 has anyone interface graphics LCD/ OLED with beaglebone ??? Feb 20 13:51:42 can someone give suggestion which LCD/OLED beaglebone supports Feb 20 13:57:45 tried google? Feb 20 14:01:13 yes, but my doubt is graphic lcd driver is pre-written linux ??? Feb 20 14:05:29 for some, yes Feb 20 14:06:03 how can we find this ??? Feb 20 14:06:24 people have connected LCDs to the bone already Feb 20 14:06:33 if yours is similar, it might work Feb 20 14:06:43 I don't know which lcd/oled the beaglebone supports but the bone's processor uses the arm standard graphics adapter Feb 20 14:06:49 so from a software perspective it should work afaik Feb 20 14:06:51 I haven't actually tried it Feb 20 14:07:07 https://www.google.com/search?q=beaglebone+lcd Feb 20 14:07:07 wtf is "arm standard graphics adapter"? Feb 20 14:07:15 stand by and i'll tell you Feb 20 14:07:15 +1 wtf Feb 20 14:07:27 koen: its AGA vs VGA Feb 20 14:07:39 I'm quite certain that I called it totally the wrong thing Feb 20 14:07:41 koen: opposite of "leg unstandardized sound adapter" Feb 20 14:07:56 LetoThe2nd: s/adapter/converter/ Feb 20 14:08:06 av500: my bad. Feb 20 14:08:19 whats the opposite of an adaptor? a dedaptor? Feb 20 14:08:20 http://elinux.org/Elc-lcd Feb 20 14:08:31 av500: no, daptor Feb 20 14:08:47 or prodaptor if you want to be explicit Feb 20 14:09:01 av500: HAVING KARTOFFELDRUCK DEV DAYS AGAIN IS BAD THE BRAINS, I NOTICE :/ Feb 20 14:09:06 fiftyfaptor Feb 20 14:09:07 gnah. Feb 20 14:09:10 koen: hi! is the latest angstrom precompiled image already can cape enabled? Feb 20 14:09:20 SGX530 graphics engine which implements PowerVR Feb 20 14:09:25 PowerVR is pretty f'ing standard Feb 20 14:09:31 but not to arm so i was both wrong and ... slightly less wrong Feb 20 14:09:36 SilicaGel: yes, but it does not talk to LCDs Feb 20 14:09:44 all it does is to write into a piece of memory Feb 20 14:09:57 yeah, that memory belongs to the LCDC controller right Feb 20 14:10:34 dwery: the one I sent to the factory yes, need to upload that to the proper place Feb 20 14:10:58 koen: nice. I'll add a link on the user's manual when it's ready Feb 20 14:11:01 so mentioning sgx does not help to futher the narrative Feb 20 14:11:05 do you have a temp link? Feb 20 14:11:12 /tmp/dfsksdfhhfjk Feb 20 14:11:17 work for me Feb 20 14:11:25 :D Feb 20 14:11:38 I was responding to this: yes, but my doubt is graphic lcd driver is pre-written linux ??? Feb 20 14:11:44 yes Feb 20 14:11:54 lcd driver != 3d engine Feb 20 14:12:22 oh SGX ONLY provides 3D? I see Feb 20 14:12:30 yes Feb 20 14:12:34 I'm not really a graphics guy so maybe I should shut up then. Feb 20 14:13:15 I do know that the LCD interface on the beaglebone takes up a *load of pins Feb 20 14:13:29 so if you need a lot of serial ports, etc. then that's a problem :( Feb 20 14:14:59 has any person in the present chat has interface LCD with beaglebone/begleboard?? Feb 20 14:17:25 av500, SilicaGel, koen thanks for the discussion, but i don't seem to get u all Feb 20 14:17:31 :( Feb 20 14:17:45 aj2903: yes, some people have connected an LCD Feb 20 14:18:09 did you even look at the google results? Feb 20 14:18:13 aj2903: like http://www.youtube.com/watch?v=_KAD_Oqpi14 ? Feb 20 14:18:45 * av500 watches koen doing his morning jog.... Feb 20 14:21:09 koen thanks, but where can we get LCD details Feb 20 14:22:15 do you have the LCD or not? Feb 20 14:22:24 the one you want to connect? Feb 20 14:23:07 no, i'm planning to buy which supports beaglebone Feb 20 14:24:27 av500, any suggestion which LCD to buy ??? Feb 20 14:38:59 koen: http://www.youtube.com/watch?v=uWYn5wJ72zY&feature=youtu.be Feb 20 14:44:41 nice Feb 20 14:44:46 albeit $$$$$ Feb 20 15:20:31 how to check if the kernel has NEON support enabled? Feb 20 15:26:32 arcanescu: http://www.linux-arm.org/LinuxKernel/LinuxNEON Feb 20 15:27:32 wmat: im using the kernel which came with the beagle's sd... how can i check if it already has neon enabled Feb 20 15:27:41 or would you know if it doesnt.... Feb 20 15:28:33 it should Feb 20 15:28:39 does neon fail for you? Feb 20 15:28:50 arcanescu: grep the config file for NEON Feb 20 15:30:06 av500: no... i just dont know if its enabled or not.... im just starting off with it Feb 20 15:34:58 wmat: by default its enabled so ... i guess it is thanks.. Feb 20 15:35:35 arcanescu: some useful info here http://elinux.org/BeagleBoard#ARM_NEON Feb 20 15:36:43 I had a disussion with someone on here a while ago that talked about the relationship between VFPv3 and NEON and the fact that they share certain pieces Feb 20 15:37:20 SilicaGel: they do Feb 20 15:37:22 I gathered from there that "turning it on" was really a matter of setting the right compiler flags to generate code for it ... Feb 20 15:37:28 Is that right? Feb 20 15:37:29 try omafbplay, that uses neon, and usually works on the default angstrom setup Feb 20 15:37:31 yes Feb 20 15:37:45 there is also some bit in the actual arm core to enable neon on the CPU Feb 20 15:38:46 wmat: thanks.... setting the compiler flag should allow generating the code for it correcT? Feb 20 15:38:48 *t Feb 20 15:39:04 Well, not if what av500 says means that it's not "turned on" first (??) Feb 20 15:41:00 it should Feb 20 15:41:16 i doubt there is any recent kernel that does not do it Feb 20 15:56:50 was that a question at arm bof? support for neon come from the compiler, the kernel doesn't care. Feb 20 16:05:31 arcanescu: if in doubt: grep neon /proc/cpuinfo Feb 20 16:06:13 but that doesn't mean that your linux already uses it. Feb 20 16:07:00 my kernel is so much faster since I enabled neon on it Feb 20 16:08:00 we had a good laugh about the phoronix benchmarks Feb 20 16:08:09 integer ops go faster with hardfloat and all Feb 20 16:08:16 and speed advancments up to 40% are not possible through hardfloat, just when comparing apples and oranges ;) Feb 20 16:08:43 like debian seems to do Feb 20 16:09:00 armv4t vs armv7a-hf Feb 20 16:09:25 yes, braindead Feb 20 16:10:18 -HF ?!?! What's that?? Feb 20 16:10:23 koen: watch the ARM bof and observe what I asked the arm guy :) Feb 20 16:10:37 SilicaGel: hypefloat Feb 20 16:10:38 ehm Feb 20 16:10:40 I mean Feb 20 16:10:42 hardfloat Feb 20 16:10:59 av500: ELC-E armbof? Feb 20 16:11:02 yes Feb 20 16:11:04 no Feb 20 16:11:06 fosdem Feb 20 16:11:30 I'm trying to figure out the minimum source impedance to drive the bone's A/D and get decent linearity and accuracy, and I am angry at the TRM. Feb 20 16:11:43 the TRM shrugs I guess Feb 20 16:13:11 aholler: thanks! Feb 20 16:13:39 here are some benchmark results I've done: http://groups.google.com/group/beagleboard/browse_thread/thread/8a02388772a1d177 Feb 20 16:13:45 the trm is like the cake in portal Feb 20 16:34:27 Are there any simple way to test beagleboad audio system? In kernel 2.6.28, I just use `cat /dev/urandom > /dev/dsp`, but In kernel 2.6.39, this way don't work. Feb 20 16:35:47 why not just play an audio clip with mplayer or aplay Feb 20 16:40:37 how to use aplay to test with media file such as *.mp3 or *.wav ? Feb 20 16:41:13 mplayer is so large footprint to test. Feb 20 16:45:27 robinswan: why does the player you want to use have to have a small footprint? Feb 20 16:46:19 robinswan: btw you can play raw files with aplay Feb 20 16:47:13 robinswan: aplay /dev/urandom Feb 20 16:47:39 carli2: thanks! I will try. :) Feb 20 16:49:28 aplay -f cd Feb 20 16:49:50 urandom could sound pretty nasty Feb 20 16:51:48 Another question, Angstrom-2010.x use the kernel 2.6.39, it cause my DVI monitor blank. Feb 20 16:52:26 I find /sys/class/display is empty dirctory. Feb 20 16:56:19 Some document tell me set OMAP DSS output to DVI, use `echo 'tv' > /sys/class/display_control/omap_disp_control`, in kernel 2.6.39, I can not find this driver config entry. Feb 20 16:57:18 tv would be the svideo, don't think that's what you want Feb 20 16:58:32 Sorry!, I want use `echo 'lcd' > /sys/class/display_control/omap_disp_control` to set DSS output to DVI. Feb 20 17:02:33 does it not show anything over the dvi port with a hdmi to dvi-d cable? Feb 20 17:03:13 thurbad: where did you get the sd image from? Feb 20 17:03:32 yes, but the video output of u-boot is work. Feb 20 17:04:21 I got my initial image from narcissus/angstrom Feb 20 17:05:21 I use x11-image of angstrom build by `bitbake x11-image`. Feb 20 17:05:27 thurbad: the online builder did not work for me. I used the sd image shipped with the board and modify it Feb 20 17:09:03 the version that shipped with my xM was booted to a ramdisk Feb 20 17:09:26 my C4 didn't ship with any images Feb 20 17:10:19 Kernel 2.6.39 cause my standard monitor via DVI port, but in my DIY LCD driver board, video work :). Feb 20 17:11:44 cause my starndar monitor blanking. Feb 20 17:12:13 oh, you mean it goes to sleep after a while, but it works initially? Feb 20 17:13:43 yes. in standard monitor sleep after u-boot video output. Feb 20 17:13:59 oh... it shouldn't sleep that soon :/ Feb 20 17:14:33 do you have the dvimode set in a mode that your monitor supports? Feb 20 17:15:28 I comfirm set the DVI mode. Feb 20 17:17:26 but I have a LCD driver board, it can work u-boot and Linux. Feb 20 17:26:33 Crofton|work: " another person was demonstrating an open-source GSM access point based on USRP" Feb 20 17:27:05 I saw that Feb 20 17:32:06 koen: OE list? Feb 20 17:35:34 ds2: free-electrons on the ELC demo night Feb 20 17:36:06 prpplague: did you notice the reference to dutch cheese on the latest drunk kitchen? Feb 20 17:36:17 "was it gouda for you as well?" Feb 20 17:36:29 oh Feb 20 17:36:32 koen: hehe, no i have had a chance to watch it yet Feb 20 17:37:25 koen: a bunch of the folks who attended ELC got a flu like bug over the weekend Feb 20 17:38:23 koen: my flight was overbooked, i volunteered to take a later flight and got a $900 voucher plus seat upgrade to first-class, hehe Feb 20 17:39:05 lucky! Feb 20 17:39:36 on my red-eye home I was next in line for an upgrade :( Feb 20 17:39:40 lucky indeed Feb 20 17:40:04 prpplague: I had the flu like bug before ELC, so I guess I was immume Feb 20 17:40:19 naw, luck was that the bar was directly across from the departure gate, and they had a good selection of brew.... Feb 20 17:40:31 koen: or you were the carrier Feb 20 17:40:40 typhoid koen Feb 20 17:40:42 * sakoman__ was one of those stricken with weekend flu :-( Feb 20 17:40:47 git blame Feb 20 17:41:34 I will claim that us northern cold dwelling folks must be from hardier stock :) Feb 20 17:42:03 hehe, or with it was a northern strain Feb 20 17:43:28 does anyone know how i can change my dvimode? I tried uenv.txt already... Feb 20 17:43:51 screen goes flickering up and down.. i use hdmi cable Feb 20 17:48:00 ATP what did you set in uEnv.txt Feb 20 17:50:58 rage quit ! Feb 20 17:51:23