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I was making a little device that would have three buttons (like the ones at radioshack) and each preform its own action. These buttons and their actions would be controlled by a very small real time operating system that I would put on this device.
Would I need an ARM Processor in any way?
How would I put the real time operating system on the device?
What OS would I have to compile this on (ex. Ubuntu? Mac OS X? Windows 7?)?
Are there any examples of anyone doing this?
P.S. No prebuilt boards (ex. arduino). I would build the board myself.
Any feedback would be greatly appreciated!
Even if you don't want to use a prebuilt board in the finished product, I'd recommend getting a prebuilt board (like the Arduino), build your product, program it, test it, etc. while on the breadboard, and then simply rebuild it however you want, using the same hardware as you've been using.
That helps you out especially the next time you're building something, because you already have the prototype board and the toolchain ready to go.
Compiling your files can be done on any OS.
Enumerated version:
No, and I wouldn't even recommend using an ARM processor; but rather an Atmega328 or similar.
Using a programmer.
Any.
Probably millions, or at least hundreds of thousands of examples, yes.
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I'm trying to build a custom board to use LED or LCD screens using one of the ARM processors and PCB( I'm buying separate parts and soldering them on a PCB ).
I wonder how to execute a program on that board.
Do I just write a C program on my PC, compile, and upload the binary file to the board?
Or is there any other necessary program or code to execute a C program on custom ARM board?
I hope someone could show me some directions and examples. I'm lost.
Massively broad question. Yes you need a toolchain that can build programs for the arm processor. Which generally means a cross compiler, good news is that gcc and clang/llvm are free and are capable of the job, but its not that easy. Find a sandbox (someone, like the chip vendor (arm is not the chip vendor they simply made some IP that the chip vendor bought and put in their part), will have a development environment and libraries and examples) and learn from that.
And you need tools in order to get the firmware downloaded into the part. Software and hardware tools.
Start with an eval/dev/hobby board first. They are often $20 or less, there are many in the $10 range, enough to keep you busy for a long time. You can wire up displays to these boards long before it is time to start thinking about making your own PCB.
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I am tasked with porting a massive c project from windows to linux. I have never ported anything over to linux before and am pretty new to linux. The project uses quite a bit of win32 calls. I have looked through some of it and understand what those parts do, however there are many moving parts and i feel it would take too much time to look through it all. What would be the best way to port it over? Is it foolish of me to think I can move the project over to the linux machine and work through the errors one by one?
Thank you in advanced!
Wine is a Windows Emulator for Linux, more exactly a re-implementation of the Windows API and binary interface, mainly for Unix-like OSes. It has also a builtin library named libwine, which is essentially a compatibility layer between the relevant Linux APIs (mainly: libc and X11) and the Win32.
Compiling the project with libwine, you will compile a Linux executable (binary), using the libwine as a shared lib (shared lib == dll). On this way, you can use the Windows API calls in a Linux project.
Your knowledge of the Win32 API helps a lot, most likely the compatibility isn't 100%. Probably you will have to modify the code a little bit (but not too much).
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I am trying to implement a risc processor core in fpga. Is it a good idea to do such a project. I am confused whether to implement an arm core or mips core. Please tell me which would be a better option consider that i am a starter in this field.
Yes such a project would be pretty cool and you would learn a lot. That being said I believe you should build smaller things first. As for ARM vs. MIPS, the complexity is equivalent, but I would pick ARM cause it's actually the most popular processor architecture in the world right now, so the knowledge you would gain would be highly practical.
I recommend starting with a book called "CODE". It will teach you all the basics in a very clear way. Once you read that you should be able to build logic gates, full adders and even a simple generic purpose computer, all using nothing but relays and wires.
Once you've done those smaller projects then try something larger with transistors, protoboards or FGPA. One very interesting computer you could build is the IAS, also called the Von Neumann machine, which is the base for all modern computers (yet is very simple and elegant).
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I'm trying to do some learning with Linux kernel and as you all know there is nothing better than playing with the code itself, Can you please let me know which one of the Linux distros is the easiest to work with? In other words, As far as I know Ubuntu for example modify the kernel for their distro, so the question again, which distro is using the Linux kernel as is with no modification?
Appreciate your guidance.
When it comes to no-frills (no external patches to the kernel) have a look at Slackware. Or follow "Linux from Scratch", that's as bare-bones as it gets.
If you want to start playing with the Linux kernel, I'd recommend a distribution which makes it particularily easy to compile the kernel yourself. Although I cannot provide detailed guidance, Gentoo seems to do so (although gentoo has other drawbacks, I don't know a single person in real life who actually used gentoo for more than two years).
I would not try and look for distributions not modifying the kernel, it's probably not worth the effort. Patches will probably be minor compared to the overall size of the kernel.
You can easily run Ubuntu for example with a vanilla kernel by following https://wiki.ubuntu.com/KernelTeam/GitKernelBuild.
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I'd like to use a virtual machine like NekoVM into a small device but to build it, it requires Boehm GC, however there is no port of that GC to that small device so I was wondering if there is any alternative to it, something that could be done exclusively with C code?
I'd say your best option would be to port the GC to your platform, for which there are instructions (libgc porting instructions).
Additionally, it should be possible to swap out the GC implementation (NekoVM FAQ), see vm/alloc.c file.
EDIT:
Hopefully useful additional links: (untested)
Smieciuch Garbage Collector
libgcroots (based on libgc 7, abstracts architecture dependant bits)
Squirrel programming language
Perhaps you'd be better off with Lua, which has a very small but powerful virtual machine, has its own garbage collector built in, and runs on any platform that supports ANSI Standard C. With just a little effort you can even build Lua on a machine that lacks standard input and standard output. I have seen Lua running on an embedded device that was a small LCD touch screen with an embedded CPU stuck on the back. Neko is good work, but I think you'll find Lua every bit as satisfying.
I could suggest TinyGC (tinygc.sf.net) - an independent lightweight implementation of the BoehmGC targeting small devices. It is fully API-compatible (even more, binary compatible) with BoehmGC v7+ but only a small subset of the API is implemented (but sufficient for Java/GCJ-like memory management) and there is no automatic threads and static data roots registration. The latter, however, may require some efforts to make NekoVM work with it (i.e., call GC_register_my_thread() and GC_add_roots()).