#garfield Logs
Aug 06 2021
#garfield Calendar
12:00 AM aandrew: interesting
12:07 AM aandrew: I have done exceedingly little with CPLDs
12:09 AM rue_mohr: it takes a 3 bit counter to strobe the digits
12:15 AM rue_mohr: 17 wires on 6 digits
12:16 AM rue_mohr: 4 of them are commons
12:16 AM rue_mohr: so, 6 digits is 24 bits of latch
12:16 AM rue_mohr: if I use an 4 bit parallel interface
12:18 AM rue_mohr: 2 bit address bus
12:19 AM rue_mohr: ok, then starts a problem as I'm not at all sure how the decoding works
12:19 AM rue_mohr: lcd's use funny segment groups
12:19 AM rue_mohr: one group is 7
12:20 AM rue_mohr: rue?
12:20 AM rue_mohr: me?
12:20 AM rue_mohr: you
12:20 AM rue_mohr: well
12:20 AM rue_mohr: cmon
12:20 AM rue_mohr: ok, let me think, I'd say hock it
12:20 AM rue_mohr: random decoder?
12:21 AM rue_mohr: yea
12:21 AM rue_mohr: hmm
12:21 AM rue_mohr: if we have 4 commons
12:31 AM rue_mohr: ok according to this mess, there should be 12 segment wires
12:31 AM rue_mohr: I hate this already
12:32 AM rue_mohr: this is a big ugly rom
12:33 AM rue_mohr: how do 6 digits mux into a waveform with an interval of 8? I'm not sure...
12:39 AM rue_mohr: 27 latches, but the lut space is insane
12:39 AM rue_mohr: we cant just use a rom, the output it tooo wide
12:39 AM rue_mohr: maybe this is an application for your i2c eeprom
12:39 AM rue_mohr: oo
12:39 AM rue_mohr: virtual word width
12:39 AM rue_mohr: 12 bits
12:39 AM rue_mohr: could make it 16
12:39 AM rue_mohr: but tristate?
12:39 AM rue_mohr: no, not for the segments
12:39 AM rue_mohr: hmm
12:50 AM rue_mohr: arg, this shows me just how small the little peice of the world I'm in is
06:54 AM spline: https://tonyblings.com/product/life-in-progressclock1/
10:20 AM polprog: ill be in switzerland this week.. no internet mostbof the time (roaming fees are insane) so i will be quiet for a while
02:59 PM Tom_itx is now known as Tom_L
07:52 PM rue_mohr: huh
07:52 PM rue_mohr: uhu
07:52 PM rue_mohr: the interesting stuff never happens here
07:52 PM rue_mohr: spline, I saw it
09:28 PM rue_shop2: ps26h
09:29 PM rue_shop2: ah its really IRF7313
09:31 PM rue_shop2: which means we want the other chip
09:32 PM rue_shop2: irf3037cs
09:38 PM rue_shop2: IRU3037
09:39 PM Tom_L: pwm controller?
09:42 PM rue_shop2: yes
09:42 PM rue_shop2: so far I like it
09:42 PM rue_shop2: dc-dc controller reallyu
09:44 PM rue_shop2: I wanted to find out what is on various boards I'v scrounged
09:44 PM rue_shop2: I'd been pondering smps for the cpld board
09:44 PM rue_shop2: I'm not going to bother, but still wanted to answer the question
09:45 PM rue_shop2: its actually hard to find a board that doesn't have the dc-dc built into a larger chip
09:45 PM rue_shop2: damnit I forgot to phone the shipping company again
09:45 PM rue_shop2: today was hell
09:45 PM rue_shop2: it was straightforward, but not easy
09:46 PM Tom_L: it was friday so that's a plus
09:47 PM rue_shop2: I'v got multiple things piled ontop of each other that I'm the only guy who can deal with them
09:47 PM rue_shop2: not hyperventilating yet
09:48 PM rue_shop2: it doesn't help when one of the guys calls and says "all the fire bells are going off"
09:48 PM Tom_L: that's just job security
09:48 PM rue_shop2: the job will never be done
09:48 PM Tom_L: just reply with "RUN"
09:48 PM rue_shop2: I'm like a horse that knows where the end of the course is and wants to go there now!
09:48 PM rue_shop2: no, they are the ones rewiring the FA system
09:49 PM rue_shop2: its our company
09:49 PM rue_shop2: and its one of the guys thats supposed to know what he's doing
09:50 PM rue_shop2: furthermore, (figurativly) I asked him to take me a picture of a horse, and he came back with pictures of a pigeon, goat, spider, and caterpillar
09:50 PM Tom_L: of course!
09:50 PM rue_shop2: there was no brick wall available on my end of the phone on which to repeatedly smash my head against
09:51 PM rue_shop2: its entirely possible the site had no horse tho
09:51 PM rue_shop2: *another* guy in the company might have just been fucking with me
09:51 PM rue_shop2: if there is, it might cost us $4800 extra
09:52 PM rue_shop2: I'm leaning on the outcome he was fucking with me
09:53 PM Tom_L: most ppl would rather work harder to not work than just to work
09:53 PM rue_shop2: my happy thought today was sitting down programming an fpga
09:53 PM rue_shop2: nothing specific, just that
09:53 PM Tom_L: i enjoyed it
09:53 PM Tom_L: but i've forgotten alot
09:53 PM rue_shop2: its breadboarding on a different level
09:53 PM rue_shop2: :)
09:54 PM rue_shop2: I like the way it twists the way I think about problems
09:54 PM rue_shop2: I used to do hardware-centric solving like that when I was a kid
09:54 PM rue_shop2: then I got to programming and moved to software centric
09:54 PM rue_shop2: its all still there tho
09:56 PM rue_shop2: tea, the tea will be ready
09:56 PM Tom_L: just had some
09:57 PM Tom_L: i should come up with a project. it's time
09:58 PM Tom_L: things i make for me just take space up i don't have now
09:58 PM rue_mohr: I kinda lost the box of hard drive controllers I was hacking
09:59 PM rue_mohr: hey we should assemble that sprayer
09:59 PM rue_mohr: so, today I went to the sheet metal shop to get some things made for work
09:59 PM rue_mohr: cause nobody has any grattitude for me making them instead
10:00 PM rue_mohr: and, they couldn't bend 1/8" thick, 1" steel barstock
10:00 PM rue_mohr: for some mounting brackets
10:00 PM rue_mohr: so, they had a peice of bar I got
10:00 PM rue_mohr: bent them up on the jig I made for the 20ton press
10:01 PM rue_mohr: it worked really nice
10:01 PM rue_mohr: I was amused, cause they mentioned they would have to cut the steel with a zipdisk if they were gonna try to make it
10:01 PM rue_mohr: they had a horiz bandsaw RIGHT THERE
10:01 PM rue_mohr: ~whatever~
10:02 PM rue_mohr: did you see the bending jig I made for the press?
10:03 PM rue_mohr: I... lost ya didn't I?
10:03 PM rue_mohr: cmon rue, lets go play
10:03 PM rue_mohr: can we play where did the hard drive controllers go?
10:03 PM rue_mohr: :P
10:04 PM rue_mohr: are we gonna machine the holes in the bearing blocks this weekend
10:04 PM rue_mohr: sure, and find a working tape player for carl
10:04 PM rue_mohr: amd do lcd driving
10:04 PM rue_mohr: cool
10:05 PM rue_mohr: tho I'm not sure sequenced by what
10:05 PM rue_mohr: your cpld diagram was looking good
10:05 PM rue_mohr: I'm not sure on the font table tho
10:05 PM rue_mohr: oh you can work that out
10:05 PM rue_mohr: or do other things
10:06 PM rue_mohr: this controller hacking thing is getting interesting
10:06 PM rue_mohr: looks like everything is mips or arm eh?
10:06 PM rue_mohr: I suppose we need to get good at a simple mips or arm linux core
10:06 PM rue_mohr: hmm
10:06 PM rue_mohr: maybe a thin 2.6?
10:07 PM rue_mohr: I dont know if we can compile 2.6
10:07 PM rue_mohr: oh
10:07 PM rue_mohr: we might have to use 2342034.125
10:07 PM Tom_L: didn't see the bending jig no
10:07 PM rue_mohr: yea, versions took a bit of a spike
10:07 PM Tom_L: had to do something...
10:07 PM rue_mohr: I'll show ya then, 1 min
10:09 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1200528.jpg
10:09 PM rue_mohr: Tom_L, you dont have any issues with the image size, do you?
10:09 PM Tom_L: sometimes it would be nice to see better detail
10:09 PM rue_mohr: huh
10:09 PM Tom_L: that's not for bending the tabs is it?
10:10 PM rue_mohr: that bending jig has been really working out well
10:10 PM Tom_L: i could use a press but no room
10:10 PM rue_mohr: I had to make a peice that was __/------\___
10:10 PM rue_mohr: for holding a box off the wall by an inch
10:12 PM Tom_L: i had a side mount powerpack for one but gave it away
10:12 PM Tom_L: my bud gave it to me after he got an electric pump for his
10:12 PM rue_mohr: I have a nice hand pack
10:12 PM rue_mohr: I have some rams now
10:12 PM rue_mohr: not sure how/if I should do it
10:13 PM Tom_L: https://www.enerpac.com/en-us/products/USPumps
10:13 PM Tom_L: similar
10:13 PM Tom_L: just the pump though
10:14 PM Tom_L: another thing that sat for years
10:16 PM Tom_L: what size are your images?
10:16 PM rue_mohr: usualy 640x480 cause there isn't important detail
10:17 PM rue_mohr: I do have a few nice hydraulic pumps
10:17 PM rue_mohr: not packs tho
10:17 PM Tom_L: that press fixture for A9?
10:17 PM aandrew: sounds like you had a day
10:18 PM rue_mohr: Tom_L, I'll go get a pic
10:18 PM rue_mohr: (its a 15mm thick bar with a locating pin)
10:24 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1200529.jpg
10:24 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1200530.jpg
10:24 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1200531.jpg
10:24 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1200532.jpg
10:24 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1200533.jpg
10:24 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1200534.jpg
10:24 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1200536.jpg
10:25 PM rue_mohr: sean used the SOFT JAWS I was making for bending chisles
10:25 PM rue_mohr: so, I get to make a new set some day
10:27 PM Tom_L: looks like one of mine in the pic :)
10:27 PM rue_mohr: yup
10:27 PM rue_mohr: we cut them apart before bending the tabs, I kinda did that one out of sequence
10:28 PM Tom_L: i thought you might have a U to put over the other side to press them down
10:28 PM Tom_L: but you just hammer one side at a time
10:28 PM rue_mohr: yep
10:29 PM Tom_L: what size pins are those?
10:30 PM Tom_L: i forgot how wide the slot was..
10:30 PM rue_mohr: a bit too big, filed to width
10:30 PM rue_mohr: I think they are 1/4"
10:30 PM rue_mohr: but yea, slightly filed
10:31 PM rue_mohr: :S I hope this isn't becomming a bit of a boring project
10:31 PM rue_mohr: I still think you could try a steam engine
10:31 PM Tom_L: been there
10:31 PM rue_mohr: oh, hmmm
10:31 PM Tom_L: maybe HS? i forget
10:32 PM rue_mohr: how about a stirrling engine?
10:32 PM Tom_L: old enough to be all rusted
10:32 PM Tom_L: needs to be useful for me or i'll not do it for me
10:32 PM Tom_L: just becomes a dust collector
10:32 PM rue_mohr: hmm
10:33 PM aandrew: rue_mohr: I like the forming tool; how did you create that?
10:33 PM Tom_L: did you just grind the corners down?
10:33 PM rue_mohr: bar, rouned corners, and two holes with pins, filed to width
10:34 PM rue_mohr: file
10:34 PM Tom_L: i'd have machined the slot opposite in it and ballnosed the corners or used a corner rounding bit :)
10:34 PM rue_mohr: nice radius for the aluminum
10:34 PM Tom_L: yeah
10:40 PM rue_mohr: 15mm wide, to match the 3d print
10:40 PM rue_mohr: the link is from a bicycle chain
10:43 PM rue_shop2: hmm
10:43 PM rue_shop2: so, there are a few toys
10:43 PM rue_shop2: the lcd
10:44 PM rue_shop2: and uh
10:45 PM rue_shop2: ok, the xc9572xl was 5V or 3.3V thats 5V tolerant?
10:47 PM rue_shop2: hmm, the xl is 3.3V, 5V tolerant
10:47 PM Tom_L: huh
10:47 PM rue_shop2: what do you see?
10:47 PM Tom_L: i thought the xc was 5v
10:48 PM rue_shop2: xl is 3.3/2.5V
10:48 PM rue_shop2: so, xc9572 is 5V, xc9572xl is low voltage
10:48 PM rue_shop2: I dont think I have any more non-xl
10:49 PM rue_shop2: just the one chip I used on the greenhouse
10:49 PM rue_shop2: and its too small for anything
10:50 PM rue_shop2: yay I found the hard drive controllers!
10:50 PM rue_shop2: I wasn't looking, they are sitting beside me
10:52 PM rue_shop2: erp wait a sec
10:52 PM rue_shop2: here is one
10:53 PM rue_shop2: hahah
10:53 PM rue_shop2: I couldn't raise jtag at 3.3V so I put it down as a fail
10:54 PM rue_shop2: but its fine
10:56 PM rue_shop2: well,
10:56 PM rue_shop2: I wonder if I should set up another baord for 5V
10:56 PM Tom_L: of course
10:58 PM rue_shop2: then I could play with the raw lcd I got
10:58 PM rue_shop2: I dont know if 72 cells is enough
11:02 PM rue_shop2: GEM359 is the other thing on it, its some kinda scsi chip
11:03 PM rue_shop2: I think its just a microcontroller with a special io selection
11:06 PM rue_shop2: ok, that thing is so specialized I really don't mind axing it
11:07 PM rue_shop2: fiber channel is just scsi
11:07 PM rue_shop2: omg
11:07 PM rue_shop2: oh no
11:07 PM rue_shop2: bit its close ok
11:10 PM rue_shop2: "upload firmware" is a scsi command!!!!!
11:14 PM rue_shop2: maybe this time I can NOT drop the chip into the pile of drillpress shavings
11:49 PM rue_mohr: now I just gotta solder it to the new carrier
11:50 PM Tom_L: ball grid?
11:50 PM rue_shop3: haha no
11:51 PM rue_shop3: QFP, 100 pin