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I cannot read data from an SPI device using an ESP32. I've never once successfully accomplished it.
There are no examples in the ESP-IDF.
There is no example code for reading from any peripheral device I own that I can find online.
I know if I ask a question here or stack overflow it will go to the bit bucket - particularly here, but stack overflow I'll probably get flamed first.
I posted at reddit /r/esp32 because there is an Espressif staffer/coder who mods that subreddit, but so far nothing - even tagged the guy.
Am I the only one that has ever tried to do this? Has literally nobody else wired a MISO line to an ESP32 and then read data off it?
This is maybe the worst part of coding - when I'm swimming out past the markers into deep water and there's nobody left to take direction from.
Real programmers use butterflies
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Obligatory XKCD[^] 
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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I worked with VB6 until late 2018, I had to do all kinds of oddball stuff with it. Same issue, no answers from no-one.
Then I moved in automotive, good luck asking questions about AutoSAR internals - you gotta pay big bucks to a V***tor consultant for that.
10 years of experience and only rarely I worked on things where there were any issue already solved by someone else.
GCS 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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We also didn't have internet connection, we had MSDN only. We managed to have StackOverflow and CP opened up because MSDN points here.
Fun times.
GCS 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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Over the weekend I was working on building a device I've wanted for a long time (see snapshot)[^]: time / temperature data collector. Mine is Arduino-based (Nano).
First I connected an LCD using I2C.
Next I connected my RTC (realtime clock) module using I2C again.
Finally, I added the SD Card reader/writer module using....tada...SPI (mosi, miso, cs (aka ss) and sck (serial clock)).
Here's my point. Look for an example using ESP32 and sd card module and see if someone has worked this out -- it probably uses SPI.
Here's one I found => ESP32 and microSD card example | ESP32 Learning[^]
Images on that site don't show up on the page, but if you right click and view them they do. 
Hope this helps.
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The problem with that is the esp-idf has a layer already for SD over SPI so you never touch the SPI directly.
Real programmers use butterflies
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honey the codewitch wrote: The problem with that is the esp-idf has a layer already for SD over SPI so you never touch the SPI directly.
I thought maybe you were going lower level. I like to be up here on this level where I don't know about the little things going on. 
Sorry it wasn't more help. 
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I would like to be higher level. Unfortunately I am trying to interface with an RA8875 without using the Arduino framework. That means rolling my own graphics driver for it.
Real programmers use butterflies
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no, well maybe - it's a good reference of sdk "components" which there are source for so maybe if i dig through the source for the components those examples are written for i can find something.
Real programmers use butterflies
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Quote: This is maybe the worst part of coding - when I'm swimming out past the markers into deep water and there's nobody left to take direction from.
I'd swim out and help you, but I'm paddling in the surf on the other side of the island. By the time I got to where you already are, you'll have figured it out and moved much further onwards.
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You've *already* got it figured out, because you're enjoying sandy beaches and I'm looking at getting eaten by a shark. 
Real programmers use butterflies
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For those who tried three it ain't.
You launched the subject 
Bastard Programmer from Hell 
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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I have been a developer now for almost 40 years, and over those years I have seen several products that was supposed to be a no-code solution. The last fiasco was BizTalk. Supposed to allow non-programmers and analysts create applications. The real truth was that developers had to come in to make this white elephant work by creating, of all things, 'functoids'. Little C# diddies to overcome what could not be done with the so-called no-coding. One of the projects cost over a million dollars from an off-shore company, then required a band of 5-6 .NET developers to try to save it. That failed, and ended up costing about 2 million. The project was scrapped.
Interestingly, I looked into some of the Microsoft modules. I found one of them contained about 100 Microsoft GOTO statements! So much for Microsoft standards.
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Don't worry, it will all be ok this time as the no-code stuff will be AI powered and it will know exactly what people want to do...
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I suspect that if that does come to fruition, there will be a lot of hollering into mics. And when they reach a prompt telling AI what to do, and it doesn't do it, perhaps there will AI functoids as well. lol.
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I have read that and similar remarks many times. They never mention the fact that for AI to really do its thing the user(s) must first tell it what they want and that's where the problem lies. That problem is so severe that I am pessimistic about AI-driven no-code solutions ever succeeding.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
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Precisely. The problem would just shift from writing code that does exactly what the customer wants to writing specifications that describe exactly what the customer wants. I doubt the second is any easier than the first. Assuming that the AI was good at understanding natural language, the draft of the specification would be followed by endless, tedious questions like, "Do you mean this here?" and "What should be done if so-and-so happens?" It might well be faster to just WTFC (write the code). 
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Exactly. There will always be work for people with our skills. ![Java | [Coffee]](https://codeproject.freetls.fastly.net/script/Forums/Images/coffee.gif)
The difficult we do right away...
...the impossible takes slightly longer.
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Theoretically, the specification part is supposed to be happening now but we all know how well that's going.
I had a customer (a large company with two-letter acronym name) tell me once, "I won't know what I want until I see it" which was a direct violation of their own project management guidelines which required approval before any work or procurement began. They were easily the worst customer I have ever had and to this day I refuse to buy any of their products.
My attitude toward them was also shaped by being required to use what is the absolutely worst application framework I have ever had the misfortune of using or even reading about. Apparently it was some guy's master's thesis and that's what it looked like - something from academia that should have never have left it. It was a big house-of-cards state machine library where state transitions were performed by throwing an exception. I would have to work really, really hard to think of a more idiotic design.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
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Member 14840496 wrote: I found one of them contained about 100 Microsoft GOTO statements!
Was that hand-written code, or decompiled/auto-generated code?
Many sensible high-level patterns get compiled into a mess of goto statements for the low-level code. For example, try decompiling a switch block.
And that's without looking at the native assembly/machine code, where jmp and its variants rule the roost.
You generally don't want goto to appear in the code you need to maintain. But in generated code which isn't meant for human consumption, it's not a problem.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Auto-generated by MS, and it was high level C# code. Do as I say, not as I do syndrome.
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Member 14840496 wrote: Auto-generated
So as I said, no need for a human to look at it, let alone maintain it. No need to make that code look nice for a human, so long as it works correctly and runs reasonably efficiently.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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