ZSNES board

If you want to use a real SPC700, it has 4 general 8 bit input/output ports. It boots into a ROM that polls these ports basically, so that you can send your own program over to it. The SPC700 is really a two part chip, one for the 1Mhz CPU that processes the song commands, and the DSP chip which act...

There already are cpu cores written for the DS/GBA in arm assembly. You'd have to rewrite the graphics routines as they make use of the tile hardware, but a huge chunk of your work is done. Check out http://snezzids.bountysource.com . Oh, and ARM assembly programmers aren't as rare a species as you ...

They are not exactly compatible grammar wise . Besides reverse polish notation is trivially implemented with a simple recursive function. No need for this recursive descent trickiness.

0 is (edit: not) correct. (edit: bogus example was used here)

Edit: You are correct, it should be level, not 0 (but not level+1, that would lose the right-to-left evaluation property).

byuu: Looks mostly good, but the problem is ternary does not evaluate right-to-left now which is the C spec. Here is the fixed code (the unit tests actually caught this error! "9>5?95>?1:0:4*2" was evaluating incorrectly). Also a tiny bit of cleanup, you don't need to re-cache a and b #def...

byuu: Oops, you are right, the way it's currently done a comparison is assumed to be a ternary expression. To fix that you can add specific handling for the ? operator, and just make it do the zero = false, non-zero = true in the same way C does it. Comparisons would evaluate to zero and one then. T...

Without any kind of verification at all, how are you even terminating the groups? eg try : doeval("5 < 7 ? 2 + 3 : 1"); It looks like that will return 2 and not 5. But I didn't actually try that just yet. No compiler on this PC. This works correctly (it outputs 5). Basically what happens ...

Yes, the ? and : are syntatic sugar as far as this parser is concerned :). Adding error handling and output wouldn't be hard, at which point you could verifiy those types of things. http://www.difranco.net/cop2220/op-prec.htm is a good reference for the C operator precedence rules. < and > are in th...

Well, I thought it would be a bit tricker to do the right-to-left binding of ternary expressions, but it turned out to be pretty easy. It's even got some basic unit testing now ;). #include <cstdio> #include <string> using namespace std; const int maxLevel = 7; int fastEval(char *&s, int level) ...

Glad to hear it worked out well .

Nach&byuu: Sure, this code is public domain, feel free to use it. byuu: Yes, there is some recursion for each seperate precedence level in the tree, but the elegance and speed (no extra memory needed, besides on the stack) makes up for it I think. For the single literal case there is a bit of ov...

There were a few bugs in there, basically it wouldn't handle multiple operators at the same precedence level back to back (5+3+3 = 8 ). Here is the new (hopefully more bug free ;)) version. #include <cstdio> #include <cstdlib> #include <string> #include <cmath> #include <map> using namespace std; in...

Some small (and completely error intolerant) parsing code that will handle those (x+y)*(z<<t) expressions. If you want to add variable support it's not too hard, just stick an isalpha check beside the isdigit check and add a map<string, int> or something to look up the values. Doing macro expansion ...

Mog123: This isn't a competition between the two, I was planning on integrating the changes into snesadvance as well.

Pagefault: Small things perhaps, but they probably would have taken me forever to find I bet . Anyhow, no pressure, I was just interested in seeing what you had done.

Pagefault: I would be very interested in those bugfixes, if you sent me some mail with them I'd spin up a new build of snesds (snesadvance's big brother with sound emulation on the ds) as well. I've been trying to work up the motivation to recode most of the ppu stuff to get hdma support in cleanly ...

To do an SPC player all that is neccesary is emulating the SPC chip, as others have suggested just directly copy the stuff from the SPC into internal emulator state and you can use a massively simplified loop that emulates 32 cycles of SPC700, one dsp tick, then spits out a sample, ad infinitum. Tha...