#garfield Logs

Jun 10 2021

01:37 AM rue_shop2: hey! I did the other loose chip I have and it talks!
02:11 AM rue_bed2: tommorow remind me to try to write somehting for hte cpld
02:12 AM rue_bed2: have to be a bit-forward or something, cause I dont have a clock source on it
04:05 AM Tom_L: i guess jtag can push it thru without a clock to program it?
08:16 AM rue_bed2: cause jtag has its own clock
09:18 AM rue_mohr: polprog, when is the eclipse?
09:41 AM polprog: it was this morning
09:43 AM polprog: It wasnt visible at your place though :(
09:43 AM polprog: https://en.wikipedia.org/wiki/Solar_eclipse_of_June_10,_2021
09:43 AM polprog: see map
07:38 PM rue_mohr: hahahah today the XC9572XL board I ordered arrived!!
07:38 PM rue_mohr: hahaha
07:48 PM Tom_L: you got toys to play with now
08:51 PM rue_shop5: yea
08:51 PM rue_shop5: I got one of those little 4.3" lcd screens
08:51 PM rue_shop5: i think its parallel interface (parallel video data stream)
08:51 PM rue_shop5: so I should be able to work it from a z80
08:51 PM rue_shop5: started stripping it down to see
08:52 PM rue_shop5: but I want to play with an idea for a new power supply for the driveway lights
08:55 PM Tom_L: solar by day, power by night
08:56 PM rue_shop5: TheUC3842 and UC3844
08:56 PM rue_shop5: have UVLO thresholds of 16V (on) and 10V (off) The
08:56 PM rue_shop5: UC3843 and UC3845 are 8.5V (on) and 7.9V (off) The
08:56 PM rue_shop5: UC3842 and UC3843 can operate within 100% duty cycle.
08:56 PM rue_shop5: The UC3844and UC3845 can operate with 50% duty cycle.
08:56 PM rue_shop5: so
08:57 PM rue_shop5: the 3843 should be 100% at 8.5V on...
08:57 PM rue_shop5: I think it is ok
09:43 PM rue_shop5: my power supply idea works
09:50 PM Tom_L: good
09:58 PM rue_shop5: hmm but I think I can do better
09:59 PM Tom_L: the first one was underpowered?
09:59 PM Tom_L: oh
10:00 PM Tom_L: remind rue_mohr to get a box.
10:05 PM rue_mohr: arg
10:05 PM rue_mohr: I did remember today and didn't ahve time
10:17 PM aandrew: been a busy week here, looks like y'all have been busy too
10:17 PM rue_mohr: yea, so, its halarios that today the cpld board from china arrived
10:18 PM Tom_L: :)
10:20 PM rue_mohr: ARG
10:20 PM rue_mohr: the screen I got
10:21 PM rue_mohr: apparently its an 8/16 mcu interface
10:21 PM rue_mohr: not what I was after!
10:22 PM aandrew: heh
10:22 PM aandrew: that's not hte wide mipi one but another?
10:23 PM rue_mohr: yea
10:23 PM rue_mohr: controller might be SSD1963
10:26 PM rue_mohr: hmm maybe , maybe not
10:26 PM rue_mohr: no that cant be
10:27 PM rue_mohr: well, its alive, I can scope it
10:28 PM rue_mohr: no, ok
10:30 PM rue_mohr: the screen is marked HT043XA-07R2009KH if anyones google-foo is better than mine
10:30 PM Tom_L: as much as you get from china they should have a shipping lane to your door
10:31 PM rue_mohr: the 43 means 4.3"
10:31 PM rue_mohr: HT is the brand
10:32 PM rue_mohr: or H and T means standard
10:35 PM Tom_L: nuthin
10:36 PM rue_mohr: I think HT is the maker
10:38 PM rue_mohr: ooo
10:38 PM rue_mohr: pinout
10:39 PM rue_mohr: ok I found a datasheet for one thats close enough
10:39 PM rue_mohr: pinout seems to basically match
10:39 PM rue_mohr: and its the interface I wanted
10:40 PM rue_mohr: 480x272
10:43 PM rue_mohr: https://www.alliedelec.com/m/d/3d2778cbfb01662d2e77d1cc4c592588.pdf
10:43 PM rue_mohr: is what I found
10:43 PM rue_mohr: its not technically for this screen, but I think its a complete match
10:46 PM rue_mohr: https://www.aliexpress.com/item/32915217392.html
10:46 PM rue_mohr: same as that I think
10:46 PM rue_mohr: oh maybe not..
10:47 PM rue_mohr: this is hard
10:49 PM Tom_L: contact the site and ask for a data sheet
10:50 PM rue_mohr: hah, for now I give up, I found the datasheet I'm sure matches and I'll go with that
10:50 PM Tom_L: i did that once and got a chinese one but google did a good job translating it
10:50 PM rue_mohr: I'll hit this one up with my logic analizer
10:50 PM rue_mohr: I want to make another power converter and its an hour till bedtime
10:51 PM rue_mohr: and I wanted to play with a cpld
10:51 PM rue_mohr: the one from china has some lights and a clock on it
10:51 PM Tom_L: no, it's nearly an hour past bedtime :)
10:51 PM rue_mohr: I need to look up the info its from
10:51 PM rue_mohr: www.lctech-inc.com
10:51 PM Tom_L: at least tomorrow is friday
10:51 PM Tom_L: gnite
10:52 PM rue_mohr: gngiht