Raspberry Pi C/C++ Baremetal Programming | Using C to Direct-Register Control Your Raspberry Pi

The Raspberry Pi is a fan favorite of makers and embedded developers. In my previous tutorial on Raspberry Pi Baremetal programming, I demonstrated how to use ARM Assembly to perform direct-to-register programming on the RPI 3B+. In this video, I'll show you how to do direct to register programming, but instead of using assembly, well use C to turn an LED on and off via the Raspberry Pi's GPIO Interface.

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[DavesGarage]

Really appreciate the starting point! You might want to mention how to get the SDK or whatever assembler and linker you're using. I'm about to search for it, but a link would have made it easier!

[ChandlerKluser]

Dude that's great!! Could you please tell us more about how these linker files are and how these C compilers work? thanks in advance!

[CallousCoder]

It’s much easier on ARM to run bare metal is easier than on Intel. I was about to start a series of making a cooperative multitasking OS. But I got a new project, so no time for now.

I wasn’t aware about this header file, when I did my GPIO video I had to deep dive into the documentation.

[packa]

Any plans to work in graphics later on in the series? Btw great series!

[alexroman]

the most difficult for me was linker script and assembly regions explanation.

could u tell me where to find good help to understand how linker scripts work and how arm cpu reads data from linked and compiled file. (assembly start file+C files that contains below in file)

[meoDomicio]

I love low-level programming, thanks for your videos.

[maksimmuruev]

Is it any timer usage possible instead of empty while loops? Will be also interesting to see. should be more energy efficient.. I suppose

[zapiton]

I was searching for gold, but found platinum.
until the end of the video I thought, that u coding for rasbian os😅😅
this is cool staff

[TooSlowTube]

Is there a video explaining the process of compiling it all (after installing a tool chain, maybe?) and loading it onto a microSD card? I don't get how to actually make use of this information and get the code running on a Pi.

[butterfinger]

This is awesome!! Can you make a hello world on hdmi example. Is it even possible using c++?

[lxw]

Thanks for the simple example. I just make and flashed kernel7.elf to a SD card. put it in RPI3. the LED connected to GPIO21 did not turn on and off.
compile has some warnnings. and check BCM2837 datasheet, the GPIO_BASE is 0x7E20, 0000. not 0x3F20, 0000. Is there anyone meet the same issue?

[bryanhutson]

would really love to see this done on a more modern intel/amd x86 cpu.

[hallkbrdz]

Q: Instead of a loop for delay, is there a high-resolution counter I can use to turn on a GPIO pin, wait, and then turn it off again after 5µS?

[dertom]

Amazing stuff! 👍But when you wrote the 'sleep'-logic I thought, that won't work (8:36), at least not as a 'sleeper'. It looks like a perfect example for a compiler like gcc(with -O2) to optimize the loop out and replace it just with setting i to the value of Thought you should have used 'volatile' keyword for i-variable or -O0. But no, ...too many thoughts 😆, worked as intended... 👍
Really need to try this at home 🤩

[ORIofficialchannel]

that's something new, thank you!

[datbuiquang]

Why in the linker, start location is . = 0x8000

[benlee]

Can I write the write() & read() function in Pi OS?
By that I mean can I access the register using the address mentioned in the datasheet (just like what you do)?
ex. If I want to change the value of BCM2837_GPFSEL2 by point to the address "0x3F200008

[jeffcauhape]

Where can we go to learn more about linker files?

[edgeeffect]

I'm trying to write assembly in a modular (hopefully) scalable way.... I'd love to see if other people could maintain it.

[robotboy]

Hi,
I'm assuming this uses the same C/C++ SDK as the RPi Pico right ??