01:37 <Guest636> I am connecting an rs232 - ttl converter to the beagle board x15 debug port, with the help of the IRC can someone please tell me where I can pickup 3.3v on beagleboard x15 it self? I would really appreciate it

01:40 <zmatt> good question

01:40 <zmatt> it's obviously on the expansion headers but those are annoying to connect to

01:41 <zmatt> you could pull it from the jtag header

01:47 <Guest636> I believe I get it the 20 pin jtag looks like pin 14 according to the pdf

01:49 <Guest636> would that be right

01:54 <zmatt> 3.3V is pin 5 of the JTAG header

01:58 <zmatt> this pin: https://liktaanjeneus.nl/bbx15-jtag-3v3.jpg

01:59 <zmatt> (this image is from rev A, hopefully the orientation of the connector hasn't changed, I'm not near my own bbx15 to check)

02:00 <Guest636> it looks the same

02:00 <Guest636> I'll test it out

02:01 <zmatt> 3.3V is also available on pin 1 of the J3, J4, and J6 headers next to the ethernet connector

02:01 <zmatt> ehh sorry, pin 1 of J3 and J4, pin 3 of J6

02:03 <Guest636> thats very kind of you to offer the help. I saw in in a couple of places I have been working on an off with x15 but I do alot of experiments on bbb

02:03 <zmatt> bbb is definitely easier to work with

02:06 <zmatt> (huh... I also just noticed how odd the schematic around those J3/J4/J6 jumpers is... to be able to use them as boot selection jumpers you actually need to desolder the nearby resistors otherwise jumpering pins 1 and 2 of any of these creates a short from 3v3 to ground... wtf, why are those resistors 0 ohm instead of like 10K or so o.O)

02:40 <Guest636> I am with you certain aspect of the board is really mechanically complicated

02:42 <Guest636> I have been trying to get the debug to connect directly to an rs232 access server I just received over mail the rs 232 ttl converter but the baud rate seems to be hard wired to usb max speed

02:43 <zmatt> that sounds nonsensical

02:43 <Guest636> how so?

02:43 <zmatt> what do you even mean by "usb max speed" ?

02:44 <zmatt> also, what does usb have to do with an rs232 to ttl converter?

02:44 <Guest636> when I run commands like for example

02:44 <Guest636> setserial /dev/ttyS2 baud_base 115200, this comes back just fine, but if I check again

02:44 <Guest636> setserial /dev/ttyS2 -a

02:44 <Guest636> Baud_base: 3000000, close_delay: 50, divisor: 0

02:44 <Guest636> closing_wait: 3000

02:44 <Guest636> Flags: spd_normal

02:45 <zmatt> what is /dev/ttyS2 in this context?

02:45 <Guest636> would be ttyS0

02:45 <Guest636> but it gets renamed on bootup

02:46 <zmatt> like, I'm not sure what you're even talking about. do you mean on the bb-x15 ? on your pc ?

02:46 <zmatt> where does usb come up in all this?

02:46 <Guest636> I apologize I get what your asking it the x15

02:47 <zmatt> the serial console on the bbx15 is /dev/ttyS2 (not /dev/ttyS0) and it defaults to 115200

02:47 <zmatt> I don't know what "setserial" is, it's not installed by default and I don't think I've ever used it

02:48 <Guest636> The baud rate is correct if I use a ttl to usb cinverter

02:48 <zmatt> you can check the baudrate e.g. with stty -a -F /dev/ttyS2

02:48 <Guest636> I have and this sis the out put

02:49 <Guest636> stty -aF /dev/ttyS2 speed 115200 baud; rows 24; columns 80; line = 0;

02:49 <Guest636> but the characters are still garbled

02:49 <zmatt> (btw don't paste multi-line output into IRC, use a paste service like pastebin.com to share it)

02:50 <Guest636> ok

02:50 <zmatt> you mentioned an "rs232 ttl converter" .. what do you mean by that exactly, do you have a link?

02:51 <Guest636> yes I will provide one

02:51 <zmatt> what are you trying to do anyhow? the serial debug console is normally very rarely needed, basically only to debug boot issues

02:51 <Guest636> https://www.amazon.com/MAX3232-Connector-Converter-Equipment-Upgrades/dp/B07PFB4MHR/ref=sr_1_3?dchild=1&keywords=max232&qid=1628131889&sr=8-3

02:54 <zmatt> the reviews seem mixed... "I bought 5 of these, and found that the DE-9 connector wasn't sufficiently soldered to ensure functionality on each"

02:54 <Guest636> I actually a lot of issue of the console port becuase its really the only port that comes stock typically on most network equipment and server where you can view all bootup messages

02:55 <Guest636> I actually make a lot of use of the console port because its really the only port that comes stock typically on most network equipment and servers where you can view all bootup messages

02:56 <Guest636> its also common to use the console port to manage a device its most native node

02:56 <Guest636> mode

02:56 <Guest636> not node

02:56 <zmatt> why not use ssh ?

02:57 <Guest636> because to use ssh the tcp stack must be up and running

02:57 <zmatt> also I'm not quite sure what you're saying... I guess if you really want to always be able to see early boot messages from the bbx15 then yeah that's what the debug console is for

02:58 <Guest636> if you have an issue that happens during boot up ssh is wont be an option

02:58 <Guest636> exactly your saying it up above

02:59 <Guest636> in my case sometimes the x15 is remote to where I am physically sitting

02:59 <zmatt> anyway, like I said, the reviews on the product you linked show a fair number of people having problems with this thing

03:01 <zmatt> and double-check which pin is actually tx and which is rx

03:01 <zmatt> since the reviews say they're swapped

03:04 <Guest636> I also used the one elinux/beagel board recommend and I get the same results. just so you know this works really well with ttl to usb converter

03:04 <zmatt> hmm, the labeling seems correct to me

03:05 <Guest636> I can also make this work using a usb to rs232 converter wit the usb connected to the x15 and the rs232 connected to the console server

03:05 <zmatt> by "this" you mean the rs232 converter ?

03:05 <zmatt> (when you said "this works really well")

03:06 <Guest636> rs232 - usb ttl converter

03:07 <Guest636> rs2323 to usb converter works well and the debug cable works well which is really a ttl to usb converter

03:07 <zmatt> debug cable to the bbx15 you mean?

03:09 <Guest636> there is a cable you can purchase that has the ftd chip built into it to convert to usb from the debug port

03:09 <zmatt> there isn't really much that can go wrong on the bbx15 side anyway... it's just a built-in UART connected to the header via a buffer (SN74LVC2G241) for protection, exactly the same as on the beaglebone black

03:09 <zmatt> well if that works then you know the problem isn't on the bbx15 side, so it can only be in the ttl-rs232 converter or the way you hooked it up

03:10 <Guest636> I know exactly what your saying and I agree with you. I have been scratching my head a lot on this one.

03:11 <zmatt> be sure to double-check the wiring, measure the 3.3v supply to confirm you got the right pin (if the max3232 is unintentionally being powered via the TxD pin then you'd likely get crappy output)

03:12 <Guest636> I will measure it tomorrow morning have a nice night and thanks again I really do appreciate it

03:13 <zmatt> powering the max3232 at 5v will probably also work... the protection buffer is 5V-tolerant and the V_IH of the max3232 when powered at 5V is low enough (2.4 V) that it'll probably still work fine with a 3.3V uart signal

03:15 <Guest636> I have read plenty of posts that say top stay away from the 5v value

03:15 <zmatt> generally speaking that is absolutely true, the debug console is the _only_ exception because it has a 5V-tolerant isolation buffer

03:15 <zmatt> (on both the BBB and the BBX15)

03:15 <Guest636> got it

03:16 <zmatt> powering the max3232 from 3.3V is still preferred anyhow

03:16 <zmatt> but I'm just mentioning it as an option in case that turns out to be problematic

03:17 <Guest636> Have nice rest of your day I will be back at this tomorrow morning

03:17 <zmatt> good luck

03:17 <Guest636> thanks

15:29 <ABD> Hello

15:30 <ABD> I have recently purchased BBB wireless board

15:30 <ABD> The Data on PWM pin P9-14 seems not clearing

15:32 <ABD> and my motor is doing back and forth

15:32 <ABD> Why is this happening?

15:32 <ABD> Any help would be greatly appreciated

15:40 <ABD> abd: hello

16:57 <zmatt> uhh, what do you mean?

16:57 <zmatt> "not clearing" ?

16:57 <zmatt> what kind of motor? how are you driving it?