**** BEGIN LOGGING AT Wed Apr 18 03:00:04 2018 Apr 18 06:23:36 Excuse me，i want to flash new debian image. I need to change uEnv.txt, but I don't know root password. plz help. Apr 18 06:34:39 aolin1026: You can write a new image to an SD card and boot from that? That's the recommended way to flash a new image anyway, I think. Apr 18 06:51:45 blathijs:Thank you very much. but my company don't agree to use memory device in company. keep development documents save. Apr 18 07:00:18 aolin1026: Well, that's going to make your life a lot more complicated, then :-) Apr 18 07:01:41 AFAIK the BB can also boot from USB or network, so you might be able to boot a clean image using those mechanisms, but I have not clue how that actually works (I just recall seeing them in a list of boot device order). You might need to press the boot button on poweron to enable this. Apr 18 07:02:06 the keyword to read up in the SRM is "SYSBOOT" Apr 18 07:02:15 those pin settings define the boot sequence Apr 18 07:02:25 If your company does allow bringing a beagleboard home, you might want to consider taking care of this outside of work :-p Apr 18 07:24:48 blathijs: I write a new image to BBB at home, then I can use it in company. Apr 18 07:38:16 aolin1026: That would be the easiest way I can think of, yes Apr 18 07:40:38 blathijs: now BBB run by SD card, do you know how to change to booting by emmc ? Apr 18 07:47:51 aolin1026: https://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Flashing_eMMC Apr 18 07:54:54 blathijs: thank you very much Apr 18 11:13:15 hello, I would need the EAGLE files of the beaglebone wireless. they are not available on the github. can someboady help me? Apr 18 21:06:00 EAGLE FOR THE BEAGLE Apr 18 23:09:35 Wed! Apr 18 23:09:51 Is anyone using the L298 w/ their BBB or other variation? Apr 18 23:21:08 brb Apr 18 23:23:59 set_: trying to do a poll in here to see how many people are using the BBB for a particular purpose never works out. you've been here long enough that you should know that Apr 18 23:25:54 Oh. Apr 18 23:26:10 I still must ask. Apr 18 23:26:27 zmatt: Hello! Apr 18 23:26:31 why? Apr 18 23:26:45 Trying to get some feedback. Apr 18 23:26:58 Is there a better way? Apr 18 23:27:01 oh you have an actual question? tip: try asking it Apr 18 23:27:22 How should I interface a L298 w/ the BBB? Apr 18 23:27:25 How is that? Apr 18 23:27:56 for example...should I use UART or GPIO? Apr 18 23:28:41 I thought it was a direct connection. Should I make interfacing the L298 to the BBB a direct connection? Apr 18 23:28:53 uart?!? it's a motor driver with pwm inputs Apr 18 23:28:59 Oh. Apr 18 23:29:09 So, I use PWM! Apr 18 23:29:15 or, well, you can also use gpios if you don't need to pwm Apr 18 23:29:30 probably easier to start with gpios Apr 18 23:29:41 I tried w/ GPIOs. I failed. Apr 18 23:29:57 I was using the Adafruit_BBIO library again. Apr 18 23:30:27 ... Apr 18 23:30:34 okay? Apr 18 23:30:48 I wanted to try a regular library that was familiar to me. Apr 18 23:31:05 any library for gpios will do obviously Apr 18 23:31:11 (including none) Apr 18 23:31:32 zmatt: if I post a link to our BeagleBoard.org Forum, will you look over it? Apr 18 23:32:12 I have a photo of the exact schematic of my L298 board I want to use. Apr 18 23:32:12 perhaps I will, perhaps someone else will. if you want feedback on something, step 1 is sharing whatever it is you want feedback on Apr 18 23:32:21 Okay. Apr 18 23:33:37 https://beagleboard.org/discuss?place=msg%2Fbeagleboard%2FusD5jQsUi8M%2Fy4G7txwTAQAJ is the message I put there. Apr 18 23:34:12 If people have time to view my issue, please look over it. Apr 18 23:35:16 P4 on the schematic is a header. Apr 18 23:35:16 ... Apr 18 23:35:33 I have no clue as how I should manipulate the header to suit my needs. Apr 18 23:36:47 ew, there are no ground pins on that header? Apr 18 23:37:21 this looks like a mistake... surely one of those two 5V pins on P4 is (or should have been) GND Apr 18 23:37:34 Let me check. Apr 18 23:38:23 The only ground I have is on the Vcc/GNG/5v header. Apr 18 23:38:40 GNG = GND, sorry. Apr 18 23:39:07 i.e. P3/Header 3. Apr 18 23:39:55 this is some board you found somewhere? Apr 18 23:40:12 zmatt: Yes. I found it at OpenElectronics. Apr 18 23:40:24 Some place in Italy. Apr 18 23:40:28 okay. it was designed by morons evidently Apr 18 23:40:34 Oh. Apr 18 23:40:36 Dang. Apr 18 23:41:07 So, do you think I can still interface w/ it? I have heard nothing but terrible things about it. I took a leap of faith. Apr 18 23:41:10 like I said, having two 5V pins on P4 instead of a 5V pin and a GND pin is almost certainly an accident Apr 18 23:41:24 Oh. Apr 18 23:41:29 but anyway Apr 18 23:41:42 P3 is what I am using w/ the output headers. Apr 18 23:42:09 I have a 12v battery, some geared motors, and the BBB! Apr 18 23:42:19 the connections required to the BBB are GND to any ground pin on the P9 or P8 headers, and the IN1-4 and EN A/B pins to any gpios Apr 18 23:42:51 Oh. Apr 18 23:43:11 Hmm...how did you figure that out? Apr 18 23:43:29 So, three wire? Apr 18 23:43:41 Not one wire (plus ground)? Apr 18 23:43:41 uhh, because those 6 signals are the input signals of the L298 ? Apr 18 23:43:48 three? Apr 18 23:43:49 Oh. Apr 18 23:43:50 Okay. Apr 18 23:44:02 and a ground connection is always required Apr 18 23:44:25 Yea. One ground, one IN1 and IN4! Apr 18 23:44:29 Okay. Apr 18 23:44:36 I had it wired incorrectly. Apr 18 23:44:39 1-4, as in all four Apr 18 23:44:43 and both enables Apr 18 23:44:55 in other words, all pins of P4 except for the 5V (which you should ignore) Apr 18 23:45:08 I have these two jumper pins. Should I use them? Apr 18 23:45:08 and a ground connection (which should be made first) Apr 18 23:45:13 Okay. Apr 18 23:45:23 I have no idea what you're talking about Apr 18 23:45:31 Sir, where should I put the ground pin? Apr 18 23:45:45 i.e. to the L298? Apr 18 23:45:53 EN A/B? Apr 18 23:45:55 P3 seems to be the only header on this board where GND is available Apr 18 23:46:19 So, is it okay if I use two grounds to the only ground on the L298? Apr 18 23:46:29 ?? Apr 18 23:46:33 two grounds? what do you mean? Apr 18 23:46:59 Sorry...it is okay if I use two ground wires to the GND on P3? Apr 18 23:47:11 why would you use two ground wires? Apr 18 23:47:22 I have a 12v! Apr 18 23:47:26 battery! Apr 18 23:47:36 I have to run the motors somehow. Apr 18 23:47:56 oh like that, yes it's fine to connect both to the same ground pin.... it's mostly annoying, but this stupid board doesn't give you any other choice Apr 18 23:48:07 Right. Apr 18 23:48:15 I was confused and you made it clear. Apr 18 23:48:50 I have, since there was no ground pins available on P4, made some incorrect ideas on how to wire it up. Apr 18 23:49:19 zmatt: This is good news. Apr 18 23:49:45 I was unaware of jamming many ground pins in one "outlet" but I guess it is okay. Apr 18 23:49:49 Odd days. Apr 18 23:50:16 well all ground pins on the board would be physically connected anyway Apr 18 23:50:32 Oh. They should be at least. Apr 18 23:50:42 ohh, there's a switch to bypass the LDO Apr 18 23:50:46 for the 5V Apr 18 23:51:16 On P4? Yes...the jumper bypass pins? Apr 18 23:51:48 The board came w/ two bypass jumpers. Apr 18 23:52:12 so you can optionally provide the 5V from the beaglebone instead of using the LDO to create it from 5V Apr 18 23:52:30 Oh. Apr 18 23:53:19 it may be beneficial to do that, but it doesn't matter hugely as long as you're careful to keep the board powered as long as you're driving any of the gpios high Apr 18 23:53:36 That means nothing to me. Inevitably, I will use a 12v battery to power my motor driver (L298), a power bank for the BBB, and wiring, now that you have made it clear what I am dealing w/, to suit me needs. Apr 18 23:53:39 ... Apr 18 23:53:56 the BBB and L298 will have separate power sources. Apr 18 23:55:25 I understand, and like I said: as long as you make sure the L298 board is powered before you drive any of its inputs high there's no problem Apr 18 23:55:39 Okay. Note taken. Apr 18 23:56:08 The L298 I have came w/ a power button. Apr 18 23:56:40 I can run something on boot and then add power to the L298 by way of button. Apr 18 23:57:48 life savers...damn two pin ground mechanics beat me again. Apr 18 23:58:00 ... Apr 18 23:58:19 zmatt: I will set up something later and run it. I will let you know how it turns out. Apr 18 23:59:22 zmatt: sir, for instance, if I was to promote or attach many ground pins to one "outlet," is that smart or normal practice? Apr 19 00:00:05 it's "awkward but this board's stupid design leaves me no choice" practice Apr 19 00:00:35 Oh. Apr 19 00:00:48 That makes sense. So no but it is okay if you want to risk it. Apr 19 00:00:58 there's no risk, it's just annoying Apr 19 00:01:02 Oh. Apr 19 00:01:11 Okay. Note taken. Apr 19 00:01:36 normally you want the connections to the battery and the connections to the beaglebone to be physically separate headers for simple convenience Apr 19 00:01:58 Understood. Apr 19 00:02:03 and P4 looks exactly like it was designed for connection to the control board.... except it's missing a ground pin Apr 19 00:02:15 Do you think I should contact the mfg? Apr 19 00:02:16 which, again, looks like a mistake to me. are you sure the schematic actually matches the board? Apr 19 00:02:25 Yes sir. Apr 19 00:02:29 I looked it over. Apr 19 00:02:39 Are you looking at the photo? Apr 19 00:02:41 maybe measure the voltage on pins 4 and 6 of P4 while the board is powered? Apr 19 00:02:49 Okay. Apr 19 00:03:07 (relative to ground, i.e. pin 2 of P3) Apr 19 00:03:19 the .pdf files are not the exact replica. See the photo for that. Apr 19 00:03:39 I am looking at the image Apr 19 00:03:47 Okay. Yes sir. That is it. Apr 19 00:03:56 I don't see any pdf of the board so I'm not sure what you're referring to Apr 19 00:04:12 Oh. Apr 19 00:04:24 I was just stating the info. on the .pdf for background Apr 19 00:04:40 the pdf is the datasheet of the L298 itself, not the board Apr 19 00:04:49 Right. I am w/ you. Apr 19 00:05:14 (a better link for it would have been http://www.st.com/resource/en/datasheet/l298.pdf rather than a copy of that pdf from a random site like sparkfun) Apr 19 00:05:22 All I have is that schematic so far. The co. offered nothing more. Apr 19 00:05:35 Okay. I think I posted the link to the st.com people, too. Apr 19 00:05:46 anyway, go measure the voltage on those two pins Apr 19 00:05:50 Okay. Apr 19 00:06:07 My damn meter is gone. Apr 19 00:06:15 I have not been able to find it recently. Apr 19 00:06:21 Theives! Apr 19 00:06:40 ... Apr 19 00:06:49 Anyway sir, thank you for pitching in once more. Apr 19 00:07:19 as you can tell, my main issue is asking questions that pertain to my situation. Apr 19 00:07:32 I am still trying over here. Apr 19 00:09:22 most important thing to have learned: interconnected boards always need to have their grounds interconnected. (... well okay, unless interconnected solely via interfaces that are designed to work without a shared ground, such as ethernet) Apr 19 00:10:19 as I have forgotten many times, no longer will I make that mistake. **** ENDING LOGGING AT Thu Apr 19 03:00:05 2018