Problems with mpasm

[skimask]

Hi,
I am happy because I understand that you have read the basic program but I am really interested in knowing how can my program be wtitten without using the F P.
Could you please inform how it can be done ? It will be a very interesting solution.

Nothing interesting about it.
Where is the program using numbers between 0 and 1? Or fractions for that matter?
All I see is numbers that go above 16 bit. If that's the case, and you are using an 18Fxxx part, then you can use LONG variables to handle 32 bit (large) numbers.

[Bruce]

MeLabs has a nice intro to longs here: http://www.microengineeringlabs.com/...cles/longs.pdf

[iw2fvo]

Ok , Thanks Bruce I will have a look to longs as suggested.
I am writing a program in order to control the Analog Device AD9912 DDS: this device will be used as a RF signal generator for radio ham use. The point is that I have to multiply a number as like as
2^48/1000000000 ( 281474.976711) by another number that is the readout of the real output frequency ( from 1 Hz to 400 MHz ) . At the moment the Melabs FP works well and gives me the correct output frequency.
Unfortunately i can not put the " DDS" piece of program in a subroutine : in this case i do have no errors after compiling but the 16F877 does not work.
And, if I recall the "DDS" piece of program more than three times in my program i do have the same result.

>> question: how can i set the HS oscillator using the Mpasm and pic16f877 with no problem ?

Thanks a lot.
Ambrogio
IW2FVO

MeLabs has a nice intro to longs here: http://www.microengineeringlabs.com/...cles/longs.pdf

[skimask]

I am writing a program in order to control the Analog Device AD9912 DDS

Would've been a lot handier to have that information awhile back ya think?
Now I see what you're trying to do. I suppose it's a matter of how you look at it. You need the ability to handle large numbers more than you need floating point specifically...and to be able to handle those numbers with some precision. If I remember right, PBP can handle some 48 bit math (more specifically, I think you can retrieve some of the overflow from a 32x32 multiply). I don't have the manual handy, so I don't want to comment on it at the moment.

[Bruce]

Have you seen this? http://www.picbasic.co.uk/forum/showthread.php?t=1942

[iw2fvo]

I want to set up the HS oscillator mode for the pic 16f877 using Mpasm.

I did use the following for the PM:

@ device PIC16F877,HS_OSC,LVP_OFF, PROTECT_OFF ' use for PM only

What shoul I write for the Mpasm use without having the overwrite error message?
What .INC file should I have to modify ? ( pbp or mpasm ? ), if any.

Thanks a lot
Bye
Ambrogio
IW2FVO

[Bruce]

See here: http://www.picbasic.co.uk/forum/showthread.php?t=543

[iw2fvo]

Hi,
is the picbasic pro manual " 3 / 04" applicable to the 2.50 version of PBP ?
Tnks
Bye
Ambrogio
IW2FVO

Would've been a lot handier to have that information awhile back ya think?
Now I see what you're trying to do. I suppose it's a matter of how you look at it. You need the ability to handle large numbers more than you need floating point specifically...and to be able to handle those numbers with some precision. If I remember right, PBP can handle some 48 bit math (more specifically, I think you can retrieve some of the overflow from a 32x32 multiply). I don't have the manual handy, so I don't want to comment on it at the moment.

[skimask]

Hi,
is the picbasic pro manual " 3 / 04" applicable to the 2.50 version of PBP ?
Tnks
Bye
Ambrogio
IW2FVO

No...
You should've gotten a new version of the manual when you BOUGHT (and/or upgraded to) PicBasicPro 2.50
So...I guess we know where you stand...

[iw2fvo]

I bought the earlier versione named 2.46 years ago and i do have the manual. If you are so interested this version did cost to me around 230 € here.
A German radio ham gave me a recent version that is the 2.50 but without any manual.
I am waiting to receive manual or instruction from him soon.

Speaking from a more actractive point of view, I am interest in implementing the program using the new "long" capability of the basic. I will try to modify the program.
I stand here!
Any help is appreciated.
Regards,
Ambro

No...
You should've gotten a new version of the manual when you BOUGHT (and/or upgraded to) PicBasicPro 2.50
So...I guess we know where you stand...

[iw2fvo]

Hi,
thanks for the interest:
this is the peace of program that in my opinion needs a fp:

'DDS: '------------------------------------------------------------------------

AARGB0=f0
AARGB1=f1
AARGB2=f2
AARGB3=f3

ASM
CALL flo3232
ENDASM

debug HEX2 f0," ", HEX2 f1," ", HEX2 f2, " " , HEX2 f3, 13,10




' CALCOLO DELLA FTW DA INVIARE AL DDS
' 2^48/1.000.000.000= 281474,976710656
' USARE IL PROGRAMMA FREP.EXE DELLE ROUTINES FP PER CONVERTIRLO DIRETTAMENTE
' ATTENZIONE: USARE $81 INVECE DI 91 PERCHE' I 2 BYTE MENO SIGNUFICATIVI LI LASCIO
' A ZERO ( VEDERE MAIL DI i0cg )


BEXP=$81
BARGB0=$09
BARGB1=$70
BARGB2=$5F

GOSUB FPMUL

ASM
CALL INT3232
ENDASM

'debug " start ",dec aargb0," ",dec aargb1," ", dec aargb2," ",dec aargb3,13,10

LOW DDSCSB
'SHIFTOUT DDSDAT,DDSCLK,1,[%01100001,%10101011,aargb0,aargb1,aargb2,aargb3,$0 0,$00]
HIGH DDSCSB
HIGH DDSUPDT
LOW DDSUPDT

-------------------------------------------------------------------------------------
Have you some differents indication for me ?
( I am sorry for my bad English .. I am Italian )
Sometimes is very hard for me to understand the real meaning of the things !

Thanks again
Ambrogio
IW2FVO

Nothing interesting about it.
Where is the program using numbers between 0 and 1? Or fractions for that matter?
All I see is numbers that go above 16 bit. If that's the case, and you are using an 18Fxxx part, then you can use LONG variables to handle 32 bit (large) numbers.

[skimask]

Hi,
thanks for the interest:
this is the peace of program that in my opinion needs a fp:

Why does it need floating point?
Just because the program has it there, doesn't mean it has to be there.
Rewrite the program to NOT use floating point.
Again, I don't see any decimals points needed here. At most, a 32 bit variable.