Hello all,

I am trying to port Mathomatic, a computer cas system, to the Nspire CX using ndless. It says it doesn't have enough memory when I run it. I have told it HANDHELD=1 and SECURE=1 so it minimizes memory usage and have taken the number of equation spaces waaay down to the lowest the code says it can go. Also, somewhere in the readme's it says that it can run on a few MB's of RAM, so it should work on the Nspire. Sometimes it crashes the calculator and I have to reset. Frustrating process of resetting, installing ndless, etc....

I have made minimal modifications to the code, and it compiles and links without major warnings.

Any ideas? I can provide more information if you want I just don't know what else to say save telling my entire process (cmd lines, etc.).

Oh, and the code is C.

Quadratic

I am so amazed at the quick response time. Thank you.

#include <limits.h>
#include <float.h>
#include <math.h>
#include <setjmp.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
etc.

I'm guessing that is newlib. I never included <os.h> in any file in the code.

"insert a message": how? why? Like a debug message?

I used nspire-gcc and do not think I added the -mlong-calls to the command line (I ran the command a while ago and can't revive my history listing...)
As for modifications, I changed DEFAULT_N_TOKENS to 100 instead of whatever it was (in am.h), and I think whatever I needed to do to get rid of errors. And I changed example.c to fit the nspireio2's functions. (I'm using example.c for my testing purposes. Also I'm using the library and linking it to example.o.)

I'm going to re-compile everything now so I can get more precise information for you. Should I add the -mlong-calls to the command line? Should I not use nspire-gcc?

Ok. The calc still crashes (freezes up). May be my code, may not. I've checked mine as best I can. Here is the command line:

nspire-gcc  -O3  -Wall -Wshadow -Wno-char-subscripts -marm  -mlong-calls -fexceptions -DVERSION=\"`cat VERSION`\" -DLIBRARY -DSILENT=1 -DSECURE -DHANDHELD -DNO_COLOR     -c -o am.o am.c

The above for every library source code file, then the following for example.c:

nspire-gcc -Wall -marm -Os -c lib/example.c

Then I linked:

 nspire-ld-bflt am.o cmds.o complex.o complex_lib.o diff.o factor.o factor_int.o gcd.o globals.o help.o integrate.o lib/lib.o list.o parse.o poly.o simplify.o solve.o super.o unfactor.o lib/example.o -o lib/MathomaticNdless.tns

And transferred. Ran and the calc said "not enough memory" and froze. Any ideas? Should I post source code? Would rebuilding the code without ANY modifications to the code do anything?

Quadratic

(Still amazed at the quickness of replies...)

Compile everything with "-Og -g" instead of "-O3", "-fno-execptions" instead of "-fexceptions" (What do you want to do with exceptions in C?)
and debug it. If you can, set a breakpoint at malloc or a puts call and find out what it's allocating.

What do I want to do with exceptions in C? I don't know, but the makefile that came with mathomatic apparently had it in.

Remove it! It doesn't make sense and exceptions will crash the calculator.

Debug it: I can't. The emulator requires boot1 and boot2 and polydumper only dumps my boot1 for some reason, which I can't figure out.

You can get a boot2 from tiplanet.org and from a OS image (.tcc or .tnc) if you rename it to .zip.

nspire-gcc  -Og -g -Wall -Wshadow -Wno-char-subscripts -Wno-unused-variable -marm -mlong-calls  -fno-exceptions -DLIBRARY -DVERSION=\"`cat ../VERSION`\" -DSILENT=1 -DSECURE -DHANDHELD    -c -o lib.o lib.c
cc1.exe: error: argument to '-O' should be a non-negative integer
make: *** [lib.o] Error 1

-Og throws the error I expected it too...where am I wrong here?

Hmm, maybe your compiler doesn't support "-Og". "-O0 -g" should work as well, and also set "-g --debug" as flags for nspire-ld-bflt.

Oh, and if I compile with arm-none-eabi-gcc, the calc freezes on the document screen right when I click on mathomaticndless.tns. I'm curious: why then and not after it loads the console?

Some flags for gcc are missing, in particular "-fpic" so the code will crash after being loaded.

n_tokens? Try to set DEFAULT_N_TOKENS even lower, 10 maybe.

The emulator worked fine until I restarted it.

Did you save the flash?

And I can't find the malloc function. "system" folder in where?

In your ndless-sdk

So it seems like the DEFAULT_N_TOKENS HAS to be at least 100....and, the documentation says mathomatic can run on a few mb's of RAM, so I shouldn't have to hack it down lower.

Than you need to log what it dynamically allocates, either using gdb or a puts in malloc.
If the allocations aren't that much (<5MB each), something else is wrong.

Instead of putting a breakpoint in malloc I did this:

    if ((scratch = (token_type *) malloc(((n_tokens * 3) / 2) * sizeof(token_type))) == NULL
        || (tes = (token_type *) malloc(n_tokens * sizeof(token_type))) == NULL
        || (tlhs = (token_type *) malloc(n_tokens * sizeof(token_type))) == NULL
        || (trhs = (token_type *) malloc(n_tokens * sizeof(token_type))) == NULL) {
        return (((n_tokens * 3 )/ 2 ) * sizeof(token_type));
    }

So if that block (the one that is failing) fails, I'll know the largest block size it's allocating. The return value is 2400. Is that what you were asking for?

Quadratic77