Is this still possible at the register level using the Arduino R4?
If so, do I need to install any libraries?
How "bare" is your coding going to be ?
Libraries only do things that your sketch could do anyway so, no, you don't need to install any libraries
One can always code bare metal as that is as the manufacturer intended. Just grab the datasheet and go at it. There are no libraries when coding bare metal that is the point.
Of course you can also mix using libraries with bare metal code.
I'm just experimenting at the moment
Of course. I don't how it could be prevented in fact.
To me, bare metal = no libraries. Or only libraries I write myself.
However, the R4 is a whole lot more complicated than R3, although the debugger may help.
For example, look at digitalWriteFast with UNO R4
If you can get it to work, which I can't
That's a pity!
Personally, I would use JTAG + Eclipse based tools for this sort of thing. The Renesas dev board is not that expensive, and hopefully the Renesas IDE is a free download.
The Uno R4 WiFi uses the onboard ESP32 as its debugging probe but, in my case it fails to initialise on 3 different PCs
Tried to write to I/O port and I2C registers an got "Not declared in this scope".
So either they are not defined for use in the IDE or you need to include some header files.
HTH (But I think this tutorial is for R3).
https://herndlbauer.com/blog/arduino-uno-bare-metal-programming/
Not really, that is Uno R3 which has a completely different architecture.
Ok,
and this :
help?
Not sure what question you are trying to answer with these links. However, that is an example of a R4 bare metal project that does not run in Arduino IDE without modification.
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I don't know how that's going to answer how to code in bare metal. To learn is not to copy and paste all the time, but thanks for the attempt
Because I tried coding from a video. The Arduino IDE failed to compile the code, even though the person in the video used the same IDE (albeit, not same version number)
Hi @ardyhat.
Please provide a link to the video.
Please provide the full code of the sketch that failed to compile.
Please provide the full and exact text of the output from the compilation that includes the error messages.
That is correct it will unless you include the correct header files.
No, you don't need any libraries, but you need to install the correspondig core. Even if you don't use the core functionality, the adresses and bits af all registers are defined there.
I did so with my MobaTools library ( a mix of core functionality and direct register adressing where there was no suitable core functionality for my usage).
Of course, there isn't really a standardized definition of what "bare metal" means. Historically it has meant without an OS (or RTOS). To some purists, bare metal means no IDE, no libraries, no manufacturer "support packages", just the datasheet and command line tools - C++ compiler, makefile.
The purpose can be twofold : to learn more about what goes on under the hood, or to achieve better performance, or maybe something like licensing. Depending on your goals, using an IDE and additional support could be valid, it is probably more convenient.
Yes, that's true. But I think @ardyhat wrote what he means:
And to program at register level, You don't really need to define alle addresses by yourself. It's much more convenient to use the defines of the core files.