Trouble with mult.asm

[Z470]

I've been messing with this for hours and I can't figure out why it won't work...

I'm basically trying to put this code into asm:

while(R0 > 0)
{
   R2=R2+R1;
   R0--;
}

This is what I've come up with. It compiles and runs fine, but keeps throwing comparison errors. Is there something obvious that I'm not seeing?

Removed code...

Thanks for any help...

[cadet1620]

Your program appears correct and runs for me and passes the test script when assembled with the supplied assembler.

Try deleting your .hack file and reassembling to make sure that your .hack file is up to date.

--Mark

[Z470]

Okay I deleted everything and tried it again, got it to work. Thanks for the help.

[p.konrad]

Hi
I tried it the same way but I didn't get rid of the comparison failures deleting the .hack file.

Could it be that decrementing R0 directly causes the problem?

Maybe someone could check my code... it could also be possible that I made an essential mistake that I don't see right now...

thanks in advance

[cadet1620]

p.konrad wrote

Hi
I tried it the same way but I didn't get rid of the comparison failures deleting the .hack file.

Could it be that decrementing R0 directly causes the problem?

Directly decrementing R0 will cause comparison failure.  You can prevent this by putting '*' in the R0 column in the .cmp file.

|  RAM[0]  |  RAM[1]  |  RAM[2]  |
|**********|       0  |       0  |
|**********|       0  |       0  |
etc.

Better would be to copy RAM[0] to RAM[3] and use it as your counter.

--Mark

[p.konrad]

thanks, I'll try the latter first ;)

[p.konrad]

it worked without problems, thanks again :)