**** BEGIN LOGGING AT Thu Jan 05 03:00:01 2017 Jan 05 05:04:16 jkridner, ETA on the Beaglebone Blue? Jan 05 14:35:57 Ten... seems you went away. Jan 05 14:36:15 mistawright: I sent out a call for alpha testers. Jan 05 14:36:26 KotH: thanks. Jan 05 14:41:06 KotH: updated link. Jan 05 14:41:17 KotH: seems he moved his blog to tumblr Jan 05 15:43:15 Hi a few months ago I changed my BBB kernel from 3.8.13 to 4.4 kernel. Now I forgot how I did that and I want to install kernel 3.8.13 back to my BBB. Where should I start? Any idea? Jan 05 15:45:10 search doe linux-3.8 i believe Jan 05 15:45:25 either way that kernel is still available i believe Jan 05 15:45:58 I already did but I could not find something straight forward Jan 05 16:02:22 its pretty straight forward install kernel it sets uboot etc automatically reboot enjoy Jan 05 18:32:46 Can someone send me a link to download beaglebone black kernel image 3.8.13 bone 77 to an SD card? Jan 05 18:51:28 grr, wireless on my BBE is not being cooperative Jan 05 18:53:23 kk_: you said you merely "switched BBB kernel"... normally that would leave the previous kernel still installed Jan 05 18:55:21 the version you mentioned is still available simply as debian package anyway ( linux-image-3.8.13-bone77 ) Jan 05 18:55:43 note that the latest revision of that kernel series is linux-image-3.8.13-bone83 Jan 05 19:42:05 ok, finally got wifi working by downgrading to kernel 4.4.39-ti-r79 ... now the question becomes why it's not working for later versions... Jan 05 19:44:28 zmatt: you have a BBE, whats' it like? Jan 05 20:01:55 Hi guys! I was wondering if anyone could point me towards the maximum current ratings on the GPIO pins. I've found "in general these are safe values" but nothing concrete or supported by documentation. Jan 05 20:02:22 beaglebone_class: you've checked the datasheet Jan 05 20:03:55 I've looked over the user manual quite a few times as well as the more in depth wiki. I never did find any datasheets though except for the processors themselves which leave a lot to be determined by the voltage and current supplies. Jan 05 20:06:03 I mean the am335x datasheet (not TRM) Jan 05 20:07:08 but in general the GPIO should just be used for communication, not to drive anything significant Jan 05 20:07:36 not even the leds are driven straight from pins Jan 05 20:08:50 veremit: haven't had much time to play with 'em yet Jan 05 20:10:15 they seem to me work, they're blue, I can get readings from the accelerometer/gyro, barometer, temperature sensor Jan 05 20:12:22 Ah, ok. Excellent. I meant to correct "User manual" as TRM but I'm happy you knew what I meant. Jan 05 20:12:52 beaglebone_class: the TRM is more for the software point of view Jan 05 20:13:06 electrical stuff is in the datasheet Jan 05 20:15:17 Good to know. I found a few places where it would talk about current and voltage supplies for expansion headers which left me hopeful for the logic pins but I guess that was a bit naive. Jan 05 20:15:22 Thanks again though! Jan 05 20:16:57 zmatt: cool. Jan 05 20:17:17 beaglebone_class: the schematics are available Jan 05 20:20:34 veremit: yeah thanks. I've already dug through them a few times to understand a bit better the relationship between the multiple chips and the real time vs linux controlled IO. Jan 05 20:23:43 beaglebone_class: you shuold look up the PRU modules .. they wll help realtime IO Jan 05 20:23:59 beaglebone_class: they Jan 05 20:24:04 beaglebone_class: they're not multiple chips ;) Jan 05 20:24:28 zmatt: cores :P Jan 05 20:25:01 beaglebone_class: you can get an idea from how the LEDs are driven on the circuit board, what is probably sensible ;) but a few mA is probably a maximum Jan 05 20:31:51 veremit: yeah. I found a couple of How-Tos that claimed some pins can source up to 6mA while others can only supply 4 so I've just been using opamps laying around as buffers. Jan 05 20:33:24 yeah MOSFETs will work too .. and cheaper :) Jan 05 20:33:59 Small signal NPN. Even cheaper, if it's just LEDs or so. Jan 05 20:35:31 Oh I know. My parts bin has just been rather sad lately and the massive closures of RadioShacks a year or two ago hasn't helped. Jan 05 20:38:15 adafruit or digikey :) Jan 05 20:38:29 there are options Jan 05 20:38:44 they're becoming bigger companies for the 'critical mass' to survive Jan 05 20:48:33 Yeah. I try to hold off until I have a good project in mind and order from digikey with a handful of extra any part I need. Jan 05 21:22:32 beaglebone_class: my pins spreadsheet ( https://goo.gl/Jkcg0w ) has a tab ("Elec", third from the left) with various electrical properties Jan 05 21:23:33 the 6 mA / 4 mA comes from that most IOs have their vol(max)/voh(min) specified at 6 mA and some at 4 mA Jan 05 21:24:01 it doesn't say that this is the max current for those pins, it is just a specification point for the voltage they will maintain Jan 05 21:24:35 I've labeled the 4 mA pins as "weak driver" e.g. in the pin list on the BBB tab Jan 05 21:24:56 for more comprehensive voltage vs current data you'd need to use the IBIS data Jan 05 21:27:41 the only other explicit current limits I recall are the 45 mA latch-up limit and the supply limits given for the various I/O supply domains Jan 05 22:52:22 Does anyone know if there are plans to re-sign the Windows drivers so they install on default Win 10? **** ENDING LOGGING AT Fri Jan 06 03:00:01 2017