#avr | Logs for 2015-09-03

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[00:13:37] <Casper> it's annoying how atmel decided to lay their pins...
[00:13:44] <Casper> why cross the vcc and gnd on each side?
[00:13:56] <Casper> why not put xtal1 and 2 across the gnd pin?
[00:33:33] <Mr_Sheesh> Probably "What was most convenient for them"
[00:35:12] <LeoNerd> Generally it's a lot easier to snake traces around outside the chip on the PCB, than inside on the silicon
[00:35:21] <LeoNerd> So pinouts are usually made more for convenience of the si
[00:39:07] <Mr_Sheesh> Yep. Silicon dies don't really do multi-layer traces
[04:35:24] <Jartza> good day
[04:40:23] <Xark> Jartza: How goes the display generation (or are you finished)? :)
[04:42:02] <Jartza> well, it's been working for few weeks already
[04:42:05] <Jartza> haven't changed anything
[04:42:17] <Jartza> I've just been ill and haven't made the blog post about it
[04:42:20] <Xark> Okay, so sounding finished. :)
[04:42:24] <Xark> Ahh.
[04:43:01] <Jartza> https://www.dropbox.com/s/oz10nngpubfy3ye/MOV_0442.mp4
[04:43:22] <Jartza> that's how it looks like when feeding data through uart@9600bps from my "ansi tester"
[04:44:04] <Jartza> I have ideas for additional features, but I decided to stop the "feature-creep" and just write the blog post
[04:44:33] <Jartza> uart works, scrolling works, ansi escapes for wrap on/wrap off, cursor movement, screen clearing and color setting work...
[04:44:46] <Jartza> I guess it's quite usable :)
[04:45:02] <Jartza> and of course, the colors work
[04:45:15] <Jartza> but the "master" code can be used for BW VGA too with single attiny85
[04:46:42] <Xark> Looks good. Nice demo too. :)
[04:47:01] <Xark> The writeup is always one of the hardest parts to finish. :)
[04:50:25] <Jartza> indeed
[04:50:41] <Jartza> especially now when I've been in fever, coughing and with running nose for 6 days
[04:52:21] <Xark> Bummer. Hope that is over with soon for you.
[04:53:01] <Jartza> well, today didn't have fever, so maybe it's a bit better :)
[04:53:07] <Jartza> and muscles don't ache anymore
[05:01:47] <Jartza> Xark: https://github.com/Jartza/attiny85-vga
[05:01:57] <Jartza> only the blog post missing :)
[06:45:29] <Lambda_Aurigae> LoRez, was flying home from xerox school in rochester.
[06:55:44] <Jartza> welcome home, then :)
[06:57:44] <Lambda_Aurigae> spanks.
[06:57:57] <Lambda_Aurigae> only there for 3 days...seemed like 2 weeks.
[06:58:12] <Lambda_Aurigae> intense bootcamp type class.
[07:04:38] <Jartza> hehe
[07:04:57] <Jartza> when I was an instructor we had a lot of bootcamps, I liked those
[08:40:08] <rue_school> Lambda_Aurigae, so are you a repair tech now?
[11:05:19] <Yoduza> ATmega328 chip do 18446744073709551616 operations "++" per second !!!
[11:05:34] <Yoduza> something wrong in code ?
[12:03:02] <WormFood> How common is it to run USB at 3.3 volts? I noticed some of the webcams I recovered from dead laptops appear to use 3.3 volts, and the usb protocol. I was hoping I could use them for something.
[12:18:29] <aandrew> WormFood: USB signaling rate is not 5V
[12:18:43] <aandrew> WormFood: USB signaling is 3.3 IIRC, the 5V is just the supply voltage
[12:20:22] <WormFood> Are you sure?
[12:20:41] <WormFood> I'm pretty sure the signal voltages are 5
[12:28:07] <WormFood> https://en.wikipedia.org/wiki/USB aandrew you're wrong. It's 5v for both signaling and power.
[12:29:37] <WormFood> What I find interesting, is that the usb3 protocol doesn't allow for any higher margin of tolerance on the upper voltage, but it allows for a lower voltage. No doubt to handle a longer cable.
[12:33:55] <learath> you mean "higher voltage for data"?
[12:35:13] <WormFood> Max. voltage: 5.00±0.25 V for usb 2 and older.
[12:35:31] <WormFood> for USB 3, it's 5.00+0.25 / −0.55 V
[12:36:28] <WormFood> the upper voltage remains the same, but the lowest allowed voltage is lower on usb3.
[12:40:49] <WormFood> That Type-C connector is new to me. That's the first time I've ever seen that referenced before. I wonder how that will affect the types of projects we (I mean hackers as a whole) do, if we want to implement that usb interface.
[12:41:15] <learath> I really hope type-c catches on, the problem is it's more expensive :(
[12:41:40] <WormFood> and has a chip in the cable?!? That's crazy. That is such an Apple thing to do.
[12:42:41] <learath> eh? chip in the cable? for what?
[12:42:56] <WormFood> On that page, they mention a redesign of the connectors, to move the pieces that wear out more quickly, to the cable, which is cheap and easy to replace.
[12:43:21] <WormFood> I guess they think the type c connector won't wear out?
[12:43:44] <WormFood> oh. they say "full featured" cables, have a chip
[12:43:59] <WormFood> Full-featured USB Type-C cables are active, electronically marked cables that contain a chip with an ID function based on the configuration data channel and vendor-defined messages (VDMs) from the USB Power Delivery 2.0 specification.
[12:43:59] <learath> What does "full featured" mean?
[12:44:06] <learath> oh yeah, active cables
[14:21:52] <Steffanx> No, you are wrong WormFood. You better read the signalling section on wikipedia again :)
[14:22:19] <Steffanx> USB 1.1 has ~3.3V, USB2.0 ~400mV
[15:00:04] <WormFood> Steffanx, you're right. I seemed to have overlooked that part. I don't know why they didn't put that under the electrical details.
[15:00:42] <WormFood> but, to be fair, it does say the signal is 5 volts, at the top, under the electrical section. It doesn't suggest that is only for power.
[17:00:46] <Lambda_Aurigae> rue_school, I've been a copier repair tech for 7 years almost.....I'm now also a trained and certifiable,,err,,certified Xerox Field Analyst.
[17:01:42] <Lambda_Aurigae> WormFood, almost every usb chip runs at 3.3V...usb signalling is always 3.3V and not 5V tolerant...the 5V is there to power the device through a local 3.3V LDO regulator.
[17:02:31] <Lambda_Aurigae> at least, for every usb chip I've ever used it is 3.3V....even vusb uses zener diodes or something to drop the signal to 3.3V levels.
[17:07:07] <rue_school> ah good show
[17:10:04] <Lambda_Aurigae> when I moved here 7 years ago a small local copier company was the first to offer me a job.
[17:10:27] <Lambda_Aurigae> 3 years later they were bought by Global Imaging Systems which is a holding company owned by Xerox.
[17:10:51] <Lambda_Aurigae> Global is going around the world buying small copier companies and bringing them under the Xerox umbrella.
[17:11:32] <Lambda_Aurigae> Xerox is trying to get out of the copier installation and repair business...they like doing R&D and selling the fruits of that labor.
[17:12:16] <Lambda_Aurigae> so companies like the one I work for are becoming the hands and feet of Xerox...giving Xerox a much larger local footprint than they have ever had before.
[17:12:44] <Lambda_Aurigae> Iowa for instance...Xerox used to have 4 techs and 1 analyst for the entire state.
[17:13:00] <Lambda_Aurigae> now they are down to 2 techs and .25 analyst for Iowa through Xerox Direct..
[17:13:03] <Lambda_Aurigae> however,
[17:13:23] <Lambda_Aurigae> we have 15 techs and 5 analysts through Global held companies in Iowa now.
[17:15:19] <Lambda_Aurigae> we are converting our existing customers to Xerox....we used to sell sharp but other global companies sold various brands.
[17:15:29] <Lambda_Aurigae> plus we are slowly taking over the Xerox Direct customers.
[17:19:55] <Lambda_Aurigae> here's a quote for you
[17:20:11] <Lambda_Aurigae> Carpe Diem. Tenere diem pretia!
[17:21:12] <Lambda_Aurigae> too bad my latin sucks so badly.
[17:21:23] <Lambda_Aurigae> Sieze the Day. Hold it for ransom!
[17:22:03] <Lambda_Aurigae> maybe Carpe Diem. Tenere diem quo ei propitier!
[17:22:07] <Lambda_Aurigae> that looks better.
[18:19:03] <Lambda_Aurigae> https://c3.nasa.gov/dashlink/static/media/other/ObservedFailures42.html
[19:57:06] <rue_school> hah