SPI: The serial peripheral interface

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Special thanks to these supporters for making this video possible:
Aleksey Smolenchuk, Anders Carlsson, Andrew C. Young, Anson VanDoren, Anthanasius, anula, Armin Brauns, Ben, Ben Cochran, Ben Kamens, Ben Williams, Benny Olsson, Bill Cooksey, Binh Tran, Bouke Groenescheij, Bradley Pirtle, Bradley Stach, Brian T Hoover, Bryan Brickman, Burt Humburg, Carlos Ambrozak, Chris, Christian Carter, Christopher Blackmon, Dale Andrew Darling, Daniel Jeppsson, Daniel Tang, Dave Burley, Dave Walter, David Brown, David Clark, David Cox, David Dawkins, David House, David Sastre Medina, David Turner, David Worsham, Dean Bevan, Dean Winger, Dilip Gowda, Dissy, dko, Dmitry Guyvoronsky, Dušan Dželebdžić, Dzevad Trumic, Emilio Mendoza, Eric Dynowski, Erik Broeders, Eugene Bulkin, Evan Thayer, Eveli László, George Miroshnykov, Gonzalo Diaz, Harry McDow, hotwire33, Ingo Eble, Ivan Sorokin, James Capuder, james schaefer, Jared Dziedzic, Jason DeStefano, Jason Specland, JavaXP, Jaxon Ketterman, Jay Binks, Jayne Gabriele, Jeremy, Jeremy Cole, Jesse Miller, Jim Kelly, Jim Knowler, Jim Van Meggelen, Joe Beda, Joe OConnor, Joe Pregracke, Joel Miller, John Fenwick, John Hamberger jn., John Meade, Jon Dugan, Joseph Portaro, Joshua King, Jurģis Brigmanis, Kai Wells, Kefen, Kenneth Christensen, Kitick, Koreo, Lambda GPU Workstations, Larry, László Bácsi, Lucky Resistor, Lukasz Pacholik, Marcos Fujisawa, Marcus Classon, Mark Day, Marko Clemente, Martin Noble, Martin Roth, Mats Fredriksson, Matt Krueger, Matthäus Pawelczyk, Matthew Duphily, Max Gawletta, Maxim Hansen, melvin2001, Michael Tedder, Michael Timbrook, Michael Weitman, Miguel Ríos, mikebad, Mikel Lindsaar, Miles Macchiaroli, Muqeet Mujahid, My Yiddishe Mama, Nicholas Counts, Nicholas Moresco, Not Yet Wise, Örn Arnarson, Paul Pluzhnikov, Paul Randal, Pete Dietl, Phil Dennis, Philip Hofstetter, Phillip Glau, PixelSergey, Porus, ProgrammerDor, Randal Masutani, Randy True, raoulvp, Renaldas Zioma, Ric King, Richard Ertel, Rick Hennigan, Robert Comyn, Robert Diaz, Robey Pointer, Roland Bobek,§çīŤøşHï ŇåĶąýŐbŕÔ, Scott Holmes, Sean Patrick O’Brien, Sergey Kruk, Shelton, SonOfSofaman, Stefan Nesinger, Stefanus Du Toit, Stephen, Stephen Kovalcik, Stephen Riley, Stephen Smithstone, Steve Jones, Tayler Porter, TheWebMachine, Thomas Bruggink, Thomas Eriksen, Tim Walkowski, Tom, Tom Yedwab, Tommaso Palmieri, Tyler Latham, Vincent Bernat, Walter Montalvo, Warren Miller, William, Wim Coekaerts, Wraithan McCarroll, xisente, Yee Lam Wan

[ovalwingnut]

"More valuable than a thousand days of diligent study is one day with a great teacher."
--Japanese Proverb

[soumilparanjpay]

I'm an electrical engineering student and I've gotta say you've single-handedly reminded me why I chose my major and revitalized my love for electronics.

[TheMixedupstuff]

It's rare to see a Ben Eater video where I am very familiar with what he is showcasing. I've written multiple drivers using different HALs for the shown sensor.

[debarjo]

The biggest plus with Ben Eater's videos is that he has given free access to the murkiest and deeply obfuscated engineering procedures and workflows for the common people. Even if we don't fully grasp them, we know that these notoriously complex workings happening right before our eyes can be tamed with time and effort. No other contributor I have experienced has gone this far, this easily.

[lmello]

brings back EE undergrad memories. the toughest ones, microcontroller lab, assembly, LDA-ing and STA-ing bit by bit just like that. Protocols I forgot, addresses I still remember, funny failure stories... 🤓😅

[marioghioneto]

Gosh I needed an SPI class soooo bad, it came in the best timing ever

[liveen]

the production value that goes into these videos is pretty insane tbh, it must take a shitton of effort to line up the voice overs, the edits and the script to work how you're doing it. It's all very minimal but so precise and delicate, which kinda fits who you are as a figure on youtube. Kudos to you, Ben, for the work you're putting into the production of these videos

[hygri]

Ben you are an absolute institution. I'm a chemist, and closet electrical engineer / low level software engineer and your content is so precisely the right level for my brain it's ridiculous. I mean, I'm a complete amateur and such but your pace, tone and rigour with which you go through the detail is sublime. Hats off to you sir. Not that I wear a hat

[johnkaplun]

Just remember this is exactly how engineering really goes. You just follow the datasheet it works the first time perfectly, and you feel rewarded at the end.

[RaptorTeak]

This was great! Would love follow-up videos on I²C and maybe UART

[axelcodr]

I love the way you explain things, I feel now so confident at school and really feel the hunger to see all old vids too, they are just amazing!

[Vanders]

Literally the only firmware programming I ever did was to write an I2C implementation that could control the LEDs and read the temperature sensor on a network (interconnect) card. We had the prototype cards without the ASIC on them and I ended up bit-banging a parallel port on a desktop PC to implement a (very slow) I2C.

The company (Quadrics) went bust a few months later and I never actually got to see my code running from the ASIC, and that was the end of my glorious firmware programming career.

[byronwatkins]

We might also mention that devices vary about whether MSb or LSb is sent/received first. If all 8 outputs of the decoder is used, you will also need to devote one more pin to selecting/deselecting the decoder; otherwise, one of the eight devices will always be selected. If output 7 is not used, then writing 111 to the decoder will deselect all used devices, however.

[nathanmiddleton]

I was just telling my wife how the USB interface videos were fascinating and fun, this just adds to it. Thanks!

[vatterger]

I would just like to point out how god damn clean and user friendly the datasheet of the BME280 is. Timing diagrams annotated with the bit-indices, comprehensible english, a clickable table of contents, using vector graphics for every graphical element. I wish every datasheet was this well made.

[dtech]

Was having some issues with SPI on a sensor for a project I'm currently working on. This video is perfect timing. 👍

[jasperbarnett]

If only Bosch were as good at keeping their sensors in stock as they are at writing data sheets for their products...

[edgeeffect]

I had trouble with an SPI chip once.... I never considered that I was maybe using the wrong clock mode.... thanks for the tip!

I always do SPI on microcontrollers with a built in SPI port.... very interesting seeing you "go old school" and implementing the interface with bit-banging.... showing us how it REALLY WORKS.

[NickiRusin]

This feels like arcane knowledge. Crazy to think how much I don't know or understand about devices that are essential to my well-being. Amazing video, as always!

[omniyambot]

You got an absolutely gorgeous and powerful Oscilloscope there!!