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what's mram like vs fram
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May 23, 2017 18:43
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for my motorcycle thing i need to store elapsed distance at least every tenth of a mile (and ideally more frequently) in a format that can handle unpredictable sudden power loss. that pretty much means writing regularly to non-volatile storage but EEPROM or flash would die after a couple years' worth of mileage. FRAM is a reasonable option there. i think i'm gonna go with that microchip EERAM that's just an SPI SRAM and EEPROM in a single package with auto-store and auto-recall logic, though. plug that in and give it a 10uF capacitor and call it a day. i also like the idea of all the critical settings being on a DIP8 that i can pluck out and download or replace or whateve i was researching those devices and i remember i found an article about them where the comments were full of greybeards complaining about the existence of said memory chips. i don't remember what in particular pissed them off but they were maaaaaaaad
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May 23, 2017 18:48
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today i was looking for some documentation for a uart, found a bunch of wrong-rear end bullshit, and then turned to the verilog for information At the bottom of the changelog in the main file: quote:Ported to Verilog from schematic, 1995  how old is this thing???also one of the VPs worked on it back in the day. nice
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May 23, 2017 19:04
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i once saw bob pease ( ) gettin mad in his reader mail q&a that folks were beginning to use leds for anything other than status indicators, he thought that incandescent bulbs were perfect for making light and why would you want an led flashlighthe didn't live to see led room lighting i wonder whether he would have come around
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May 23, 2017 19:05
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one way of improving the life time of eeproms in applications like that is to allocate a larger memory area and increment the address on each write. i still agree that a more resiliant storage form is better though, fram is somewhat expensive compared to equivalent size eeproms but not ridiculously so. also note cypress frams lose their data after about 10 years if you store them at too high a temperature, down from nearly infinite to 10 years.
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May 23, 2017 19:07
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yeh. i considered just doing wear-leveling, and did the math on it and i could make it work out, but in the end i decided that it was just cleaner to use a module with an effectively infinite write life and also that way i can store lots of other data (user settings, etc) if i need to without worrying about shuffling things around in the memory space.
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May 23, 2017 19:14
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its also nice how you can write just one byte if you wanna write just one byte. flash can gently caress off
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May 23, 2017 20:56
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$1 for 128kbit is pretty pricey tho
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May 24, 2017 04:54
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what quantity? also this is for tiny MCUs, you can get a msp430 with 16kB (shared with program space) for $0.87 in 1k quantities $0.45 if you just need 4kB. that's cheaper than all but the smallest attiny4 ( I think microchip must be trying to kill atmel off or something)
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May 24, 2017 05:05
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microchip owns atmel now unless you mean they're trying to tank their own division and force everyone to buy garbage outdated PICs again
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May 24, 2017 05:13
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microchip is pretty awful, so its probable
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May 24, 2017 05:14
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Sagebrush posted:microchip owns atmel now yes that is what I meant the first thing microchip did when it bought atmel was dramatically raise prices it doesn't make sense
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May 24, 2017 05:19
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i had a sinking feeling this is what acquiring atmel was about but am still sad. pic is such trash hopefully arm uCs will just kill them both and make it all irrelevant
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May 24, 2017 07:47
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what is this http://www.greenarraychips.com/
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May 24, 2017 11:39
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atomicthumbs posted:what is this A miserable pile of forth
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May 24, 2017 13:23
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atomicthumbs posted:what is this Malcolm XML posted:A miserable pile of forth http://www.ultratechnology.com ( , shine on you crazy forth diamond)
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May 25, 2017 08:31
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I got a ksz8794CNX that is poo poo and I hate this stupid loving switch. It's connected to an IMX6, and when I boot using the imx_usb_loader, 99% of the time the chip comes out of reset just fine. But if I boot off of EMMC the chip freaks out and get's pissy and refuses to auto-negotiate. Yank the reset GPIO low? Nah, doesn't work. Yank the 1v2 line low? Nah, doesn't work. The TRM has no power sequencing requirements either. gently caress Micrel and their stupid loving chips. Bloody posted:microchip is pretty awful, so its probable I was looking at this: http://www.microchip.com/wwwproducts/en/ATAES132A for future products. It's only 56c in 53c of 100+. 
FlapYoJacks fucked around with this message at 12:40 on May 25, 2017 |
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May 25, 2017 12:35
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hardware guys casually emailing the firmware team: "hey we're having some trouble with the timing on the SRAM. do you guys mind if we add a wait state when the part is running at 20MHz?" 20MHz is the lowest supported speed, not the highest. it's for saving power. this change would drag down performance to 55-60% of spec and also cost nearly that much in extra power from extra active time. not to mention this is a next-generation part that is supposed to be really impressive, not embarrassing thankfully i wasn't the only one who had a shitfit about it e: added bonus, this is the third version of the design. it is comically late to suggest such a change at this point Spatial fucked around with this message at 19:18 on May 25, 2017 |
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May 25, 2017 19:15
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Spatial posted:hardware guys casually emailing the firmware team: "hey we're having some trouble with the timing on the SRAM. do you guys mind if we add a wait state when the part is running at 20MHz?" lol those fucken hardware boys when will they learn
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May 25, 2017 20:18
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usually when they get promoted into marketing and realise nobody wants garbage
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May 25, 2017 20:24
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have you tried Bubble Memory
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May 25, 2017 20:53
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ratbert90 posted:I got a ksz8794CNX that is poo poo and I hate this stupid loving switch. is the EMMC chip okay? a cheap POS SD card that happens to be a soldered down chip instead of a card is still a cheap POS SD card
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May 25, 2017 21:09
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Luigi Thirty posted:have you tried Bubble Memory in the cyberpunk alternate future we're all running bubble memory-based MSX-VII computers
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May 25, 2017 21:35
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Malcolm XML posted:A miserable pile of forth to what possible application? does anyone use these things? what is it and why
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May 25, 2017 21:35
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atomicthumbs posted:in the cyberpunk alternate future we're all running bubble memory-based MSX-VII computers MSX owns
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May 25, 2017 21:46
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atomicthumbs posted:to what possible application? does anyone use these things? what is it and why forth ended up finding a niche in weird corners of the industrial control and telecoms switching world.
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May 25, 2017 22:05
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there's a space probe that runs it in hardware too
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May 25, 2017 22:39
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DuckConference posted:is the EMMC chip okay? Yeah it's fine. It's a crucial 8GB card and has never given me any issues.
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May 25, 2017 23:41
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atomicthumbs posted:to what possible application? does anyone use these things? what is it and why idk about the rest but the answer to the last is that forth dudes are weird and super dedicated to doing everything in forth and insisting that no, your fancy modern technology is worthless next to the glory of forth that green chips thing and the earlier forth chips like the mup21? designed by chuck moore (the deity of the forth world) in eda software he wrote himself, in forth, on what amounts to an os he wrote himself, in forth. it's almost like the losethos guy except there's more of them, their religious obsession is forth, there isn't any overt racism or other horrible stuff, and they're actually rather shockingly competent engineers, some being legit geniuses. just geniuses who are obsessed with forth. i guess my analogy is bad because they're not really much like losethos guy except in one narrow way, devotion to near total rejection of technology developed outside the weird niche/bubble they've created for themselves yosposter gazpacho has written up a couple trip reports from attending some of the yearly silicon valley meet ups of the fortherati, he can probably be more informative
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May 25, 2017 23:57
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i am looking for babby's first analog electronics simulation package. something where you can draw a schematic and stick virtual probes here and there and watch what happens in real-time as you put different signals into it. i have tried some of the online apps like partsim and everycircuit but they're all really annoying and poorly documented and want money.
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May 26, 2017 00:20
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did anything actually use bubble memory other than wacky MSX hardware and Konami arcade games
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May 26, 2017 00:30
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Sagebrush posted:i am looking for babby's first analog electronics simulation package. something where you can draw a schematic and stick virtual probes here and there and watch what happens in real-time as you put different signals into it. i think i used ltspice in a course
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May 26, 2017 00:40
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ltspice its got a kinda goofy interface but it is Good
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May 26, 2017 00:43
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Bloody posted:ltspice yeah this. its what i used in school, anyway. the one thing tho is that i remember it being a huge pita trying to add components to its library
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May 26, 2017 05:03
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Luigi Thirty posted:have you tried Bubble Memory if you have a GRiD then I have someone you need to meet especially if you do any reversing (they had, like, the cloud and an app store and poo poo in 1981 because they were all from PARC)
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May 26, 2017 06:22
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Luigi Thirty posted:did anything actually use bubble memory other than wacky MSX hardware and Konami arcade games the GRiD Compass 1101 which was awesome and basically invented the modern laptop form factor the GRiD Compass II 1139 was even more awesome, it was widescreen
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May 26, 2017 06:28
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it was renamed to USER AIDS by C Everett Koop
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May 26, 2017 06:51
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Luigi Thirty posted:it was renamed to USER AIDS by C Everett Koop top cek
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May 26, 2017 07:09
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BobHoward posted:idk about the rest but the answer to the last is that forth dudes are weird and super dedicated to doing everything in forth and insisting that no, your fancy modern technology is worthless next to the glory of forth why couldn't they have chosen a good language, like APL
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May 26, 2017 07:11
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atomicthumbs posted:why couldn't they have chosen a good language, like APL or Lisp someone should've let Chuck Moore use a Lisp Machine in college or something
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May 26, 2017 07:25
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