Retrieving 32bit Multiply Result

[Nicmus]

Hi Darrel,

I’m a bit confused by your last post.
I’m not sure were to add this code. Also I have the feeling that the big_number[0] and big_number[1] are switched from the way they are in my code.

Here is the code in “colors” format:

<font color="#000000"><b>INCLUDE </b><font color="#FF0000">&quot;modedefs.bas&quot;
</font><font color="#008000">@	device  pic16F876a,hs_osc,pwrt_on, protect_on
</font><b>DEFINE </b>OSC 16
<b>DEFINE</b>	LOADER_USED	1
<b>DEFINE </b>HSER_RCSTA 90h
<b>DEFINE </b>HSER_TXSTA 20h
<b>DEFINE </b>HSER_BAUD 4800
<b>DEFINE </b>HSER_CLROERR 1

HighDigits  <b>VAR     WORD
</b>LowDigits   <b>VAR     WORD
</b>big_number  <b>VAR     WORD</b>[2]   <font color="#000080"><i>; 32-bit varia
</i></font>in_low      <b>VAR     WORD
</b>in_high     <b>VAR     WORD
</b>led         <b>VAR     </b>PORTA.2

ADCON1=6
CMCON=7	

<b>ASM  
</b><font color="#008000">MOVE?CN  macro Cin, Nout
    MOVE?CW  Cin &amp; 0xFFFF, Nout     </font><font color="#000080"><i>; Low Word
    </i></font><font color="#008000">MOVE?CW  (Cin &gt;&gt; 16), Nout + 2  </font><font color="#000080"><i>; High Word
  </i></font><font color="#008000">endm
</font><b>ENDASM
ASM
</b><font color="#008000">PutMulResult?N  macro Nin
    MOVE?WW  Nin, R2
    MOVE?WW  Nin + 2, R0
  endm
</font><b>ENDASM
    PAUSE </b>1000
    <b>HSEROUT </b>[13,10,<font color="#FF0000">&quot;Waiting for Big_number&quot;</font>,13,10]
    <b>HSERIN </b>[<b>DEC4 </b>in_high,<b>DEC4 </b>in_low]

main:
<font color="#008000">@   MOVE?CN  20000, _big_number
</font><b>WHILE </b>(big_number[1] &gt; 0) <b>OR </b>(big_number[0] &gt; 0)
    big_number[0] = big_number[0] - 1
    <b>IF </b>big_number[0] = $ffff <b>THEN </b>big_number[1] = big_number[1] - 1
<font color="#008000">@   PutMulResult?N  _big_number
    </font><b>GOSUB </b>SendBigNum
    <b>TOGGLE </b>led
<b>WEND
    PAUSE </b>5000
    <b>GOTO </b>main
SendBigNum:
    HighDigits = <b>DIV32 </b>10000
    LowDigits  = R2
    <font color="#000080"><i>'IF (HighDigits &gt; 0) THEN
        </i></font><b>HSEROUT </b>[<b>DEC4 </b>HighDigits, <b>DEC4 </b>LowDigits,<font color="#FF0000">&quot; and &quot;</font>,<b>DEC4 </b>in_high,<b>DEC4 </b>in_low,13,10]
    <font color="#000080"><i>'ELSE
        'HSEROUT [DEC4 LowDigits,13,10]
    'ENDIF
</i></font><b>RETURN

END
</b>

How do I process the in_low and in_high variables to get the big_number before entering the main loop?
Am I pulling them right as DEC4 or should I do it differently?

Regards,

Nick

[Darrel Taylor]

Sorry. Should have used your variable names ...

big_number[0] = in_high * 10000
big_number[1] = R0
big_number[0] = big_number[0] + in_low
IF (big_number[0] < in_low) THEN big_number[1] = big_number[1] + 1

Just stick it after the HSERIN.

P.S. Nice "Colors".

[Nicmus]

Hi Darrel,

I added your last lines and had to REM the line:

@   MOVE?CN  1000000, _big_number

After that everything works as intended.
I guess the macro this line was pointing to is no longer needed.
I will open an other thread with a question on detecting EOF.
There are no words to thank you enough for your help.

Best Regards,

Nick

[Darrel Taylor]

Yup, that statement/macro is no longer needed.

EOF marker for a .txt file is usually 26. That's a byte with the decimal value 26.
In hex it's 1A, ASCII it's ctrl-Z, whichever way you want to look at it.

Of course that ruins everything we just did.

And you're welcome.
<br>

[Nicmus]

Not really.
For now what we did will work just fine and buys me time.
But, and I’m sure you are the same way, if it can be improved, and you know it can, loosing few more hours of sleep doesn’t really matter. It will be a future project as I explained in my new post “Detecting EOF” (I will learn how to insert a link, I promise!)

It’s just like the CC commercial:
“The smile on your face after getting it done right…………Priceless “

Thousands of thanks again.

Nick

[nomad]

to add a link [URL]past link here[/URL] .

for example, [URL]http://www.picbasic.co.uk/forum/misc.php?do=bbcode[/URL]
adds this link http://www.picbasic.co.uk/forum/misc.php?do=bbcode ,
which is the link to the codes available and their usage.
(the "vB code" link near the bottom of the page)


there's also [THREAD] and [POST] codes, and other options to make it look all special. example:

click here for viagra!!

which takes you to your post I'm replying to, is done with:
[post=49767]click here for [size=+3][color=purple]viagra!![/color][/size][/post]

As you can see I'm really bored, but I'll stop wasting your time now.

[Nicmus]

Having fun and learning is my kind of treat.
Thanks Nomad for the crash course on posting links.

Nick