OK, Brain Freeze !! (At the moment I cannot even get a slope formula right !)
This is what I am trying to do
x var word [2]
ADCIN 6,x
x = x*2923-1343923
x1 = div32 1000
assembly says value truncated
it only allows to max ~63000
help !
Pete
handling Large Numbers
OK, Brain Freeze !! (At the moment I cannot even get a slope formula right !)
This is what I am trying to do
x var word [2]
ADCIN 6,x
x = x*2923-1343923
x1 = div32 1000
assembly says value truncated
it only allows to max ~63000
help !
Pete
Pete
|
Page 31 of the manual, 4th line down...Originally Posted by Peter1960
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Page 31 4th line down in mine says
** Top 16 Bits of Multiplication
I also found the DIV32, however ?
May I inquire what you were saying, please
Pete
Pete
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Ok, maybe we've got different versions of the manual, different sections on different pages...I was referring to Section 4.17, but I'm pulling ALL of this straight from the manual:
x var word [2] ---- space between 'word' and '[2]' doesn't work.
ADCIN 6,x ---- this might work, if you set the configuration and defines correctly, which I don't see.
x = x*2923-1343923
---this won't work at all. For one thing, 'x' can't be any larger than 22 at the start of the operation because it'll be over the 16 bit limit. 1,343,923 is actually a 21 bit number. PBP only operates on 16 bit numbers. You might be wanting to do a 16x16=32bit number multiply operation, but you aren't going to do it with a '*'. And even if you did use it correctly, you couldn't subtract 1,343,923 from the result because, again, 1,343,923 is a number that can't be held in 16 bits.
x1 = div32 1000 --- inconsistent usage with the correct way of using it
assembly says value truncated
it only allows to max ~63000 ----- because PBP doesn't deal with numbers larger than 16 bits (65535)...
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Peter,
It looks like the original formula would have been
y = 0.2923x - 134.39
With a few extra decimal places.
But since you will end up with an integer in the end, you can just round off to -134 for the b parameter (y=mX + b).
For the m parameter, 0.2923 is 2923 ten thousanths. Which is an easy way to remember that you need to divide by 10,000 afterwards.
So you multiply the A/D reading times 2923.
Then divide it by 10,000
Like this...I think that's about as close as you can get with 16/31 bit math.Code:X VAR WORD Y VAR WORD ADCIN 6,X Y = X * 2923 Y = DIV32 10000 Y = Y - 134
HTH,
DT
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Hi Daryl,
Must have been your telepathy, as I did precicly that, ie
div32 first THEN subtract
ADCIN 7,y
Pause 100 ' adc settling
x1 = y
y = y*385
y = div32 1000
y = y - 5088
y1=y1+y ' Loop to average results
If x = 9 then goto outtwo
x=x+1
Pause 100
Goto Ambient
Outtwo: Debug "A raw= ",#x1,$0D,$0A
y=y1/1000
Y1= y1//1000
Y1 = Y1/100
Debug "A calc= ",#y,".",#y1,$0D,$0A
x=0
y=0
y1=0
now results are JUST Fine !!!!
thanks Steve and Daryll
kindregards
pete
sorry Steve is meant to say Skimask
Last edited by Peter1960; - 24th April 2007 at 05:27. Reason: name change
Pete
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Ouf! Thank you very much. I have some reputation to preserve
Who's Daryll now? i know the OLD movie, a magician and an OLD guy, but the OLD guy name is DarrElthanks Steve and Daryll
Just kidding.
Last edited by mister_e; - 24th April 2007 at 21:19.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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That's my brother Daryll.Who's Daryll now?
Then there's my other brother Darryl.
<br>
DT
|
I think you have some cousins too
http://www.thinkbabynames.com/search...1&t=1&s=darrel
Paul Borgmeier
Salt Lake City, UT
USA
__________________
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mmm, the first chart confirm something ...
<img SRC="http://www.thinkbabynames.com/graph.php?g=1&c=0&1=Darrel">
Now, let's see ...
<img SRC="http://www.thinkbabynames.com/graph.php?g=1&c=0&1=Darrel&2=Daryl&3=Darryl&4=Dare l&5=Dariel&6=Dariell&7=Darral&8=Darrell&9=Darrill& 10=Darrol&11=Darroll&12=Darry&13=Darryll&14=Derell &15=Derrall&16=Derrel&17=Derrell&18=Derril&19=Derr ill&20=Deryl">
so, it's normal that many people change the spelling with ages... as it's an old old way to spell it... hence an old old name... hence OLD OLD guy to.
LMAO!
Last edited by mister_e; - 25th April 2007 at 19:25.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
|
Sometimes there's just too much information on the internet.as it's an old old way to spell it... hence an old old name... hence OLD OLD guy to.
Excuse me a moment. It's time for my Geritol.
<br>
DT
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well... i hold myself to post what else i found ... anyway, you know it's just for fun don't you?
wooohooo another blast from the pastExcuse me a moment. It's time for my Geritol.
Don't forget to put some 'Brylcreem' in your hair as well
Last edited by mister_e; - 25th April 2007 at 21:45.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
|
At our age it's more likely Denturecream !well... i hold myself to post what else i found ... anyway, you know it's just for fun don't you?
wooohooo another blast from the past
Don't forget to put some 'Brylcreem' in your hair as well
" You don't get old by being a fool "
" a lotta young wise men, deader than a motherf. ..."
"Richard Pryor"
If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
.
Gold is the money of kings, silver is the money of gentlemen, barter is the money of peasants - but debt is the money of slaves
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There simply is no "Happy Spam" If you do it you will disappear from this forum.
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