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Sometimes they don't. Sometimes what matters is how something is actually used, not how it's "supposed to work".
Some great examples are the many display controllers available for IoT devices.
They wire up using the same protocol (SPI) that SD cards use, with some exceptions.
Sometimes SPI is a 9-bit rather than 8-bit protocol. The extra bit is often used as a control bit. A lot of devices however, do not support 9-bit SPI.
The solution by pretty much every controller designer was to separate the 9th bit into its own data line - the "DC line"
The other thing they do that's not standard, is several of the controllers treat the Master Out/Slave In line as bidirectional rather than having a separate line for going the other direction. It probably saves cost, and makes the thing slightly easier to wire up, while sacrificing the full duplex capability of SPI. I'll refer to reading off this output line as an "SDA read"
The previous ESP32 handled this fairly gracefully, at least under the Arduino framework. The current chips do not seem to do SDA reads at all, even when I tried unhooking the pin interrupts from the SPI bus and bit banging the reads manually.
The upshot of this is no reading data back off the frame buffer of the display, even though the display fully supports this.
Same problem I had under the ESP-IDF framework with the old chip.
And that's not even getting into the issues with the DC line that prevent me from doing efficient SPI/LCD ops under the ESP-IDF. At least Arduino is half reasonable about it.
Standards don't matter if they mess up 80% of a class of devices they're intended to work with. What matters is does your stuff work? This newer SPI stuff on the S2 and S3 chips doesn't, IMO - standards be damned.
To err is human. Fortune favors the monsters.
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Standards are mostly guidelines and not always reliable. Gotta know your hardware, which you clearly do.
A little time, a little trouble, your better day. (Bad Finger).
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Yeah SPI is not standardized, it's all over the place. USI, SPI, DSPI, QSPI, etc., 3-wire, 4-wire, the list goes on.
The less you need, the more you have.
Even a blind squirrel gets a nut...occasionally.
JaxCoder.com
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Damn, Mike you're giving me RS-232 flashbacks here... 
Software Zen: delete this;
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For me it's a very short flashback: last run-in with RS-232 was two months ago and I had to relearn that RS-232 and UART look very much alike but are not the same.
GCS/GE d--(d) s-/+ a C+++ U+++ P-- L+@ E-- W+++ N+ o+ K- w+++ O? M-- V? PS+ PE Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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Yikes! You have my sympathy.
Software Zen: delete this;
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Obligatory xkcd: Standards
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Somehow, rum becomes awkward (10)
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Someone woke up to Seven Mary Three? 
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Never heard of them until you mentioned the name and I googled ...
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Cumbersome ?
Anagram of rum becomes
"Life should not be a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming “Wow! What a Ride!" - Hunter S Thompson - RIP
modified 27-Apr-22 4:11am.
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And you are up tomorrow. 
Care to explain?
(It wasn't a complicated one, I've got a busy day since we have no hot water this morning and the immersion heater is well and truly buried so I posted an "archive" one).
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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At last a proper cryptic clue
Why haven't you got hot water ?
"Life should not be a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming “Wow! What a Ride!" - Hunter S Thompson - RIP
modified 27-Apr-22 4:32am.
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There's no mains gas on The Ynys, and we have no access to the rear of the house except through it so we can't use bottled gas either.
So we're all electric heating, with an immersion heater for the hot water. Turns out the thermostat is fried, so I'm fitting a replacement. Which takes way longer than it should because there is a water tank above the immersion tank and I could really use one extra inch of distance between them ...
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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In the summer we need no use any kind of heater (we have electric too) as the sun is enough, so until winter comes we do not know if everything is working or not, so I have to schedule a maintenance day at the end of the summer every year... The first time I did it, found out that the builders put the water tank on 3 blocks, just to elevate for the outgoing pipe (like 5cm/2inch)... I had to move it to a metal-tripod, which took me an extra day (including the building of the tripod), but now I can maintain it standing up 
“Real stupidity beats artificial intelligence every time.”
― Terry Pratchett, Hogfather
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OG it sounds like you have an interesting home (This current problem, plus thinking about the stone walls you mentioned recently).
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It's several hundred years old, built for iron miners from local materials. It has been "modernised" in the past, but since the original didn't even support running water or a separate kitchen the mods make it ... unique.
And a real pain to do anything major to, and that includes putting up a shelf ...
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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A REALLY old building in this part of Minnesota dates back to the latter third of the 1800's. No comparison.
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Anyone see this: Heresy: Hare programming language an alternative to C • The Register?
Looks interesting, I wonder if it will gain any 'traction'.
Paul Sanders.
"Life is a minestrone" - which I take to mean that it's full of different bits and you should try to savour them all. I think that's pretty neat, I like that analogy.
And if you don't mind, here's a quick plug for my little one-man business. Follow the link if you're interested in ripping your vinyl collection: www.alpinesoft.co.uk. Thanks.
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OK, thanks.
There's a better link than the one I posted on his blog for anyone interested in learning more:
Announcing the Hare programming language
Paul Sanders.
"Life is a minestrone" - which I take to mean that it's full of different bits and you should try to savour them all. I think that's pretty neat, I like that analogy.
And if you don't mind, here's a quick plug for my little one-man business. Follow the link if you're interested in ripping your vinyl collection: www.alpinesoft.co.uk. Thanks.
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If I were going to write an O/S, I'd use C++. Sure, maybe much of an O/S doesn't need objects, templates, and exceptions, but it's good to have them at hand when using them is appropriate. I can see why going down those ratholes is something that the designer of a "close to the metal" language chose to avoid. But because of that, pass.
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It seems to me that organizing the code by objects, even if they were static, which is essentially the equivalent of C code, would be a great help. And namespaces too!
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