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Discussion Groups | Analog Devices DSPs | PAGE operator

Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).

  

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PAGE operator - haythemsalah - Aug 6 12:53:00 2003





hello,

I'm beginning with the ADSP 21992,
I need to know the utility of the PAGE() operator,
I didn't find more details in the ADSP documentation,

thanks,
Haithem





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Re: PAGE operator - twd2950 - Aug 6 18:02:00 2003

Where is this page operator mentioned?

For data memory, you have 2 data page registers (DMPG1 for DAG1 and
DMPG2 for DAG2). The IO processor also as a page register (IOPG).

Tim Dahlin

--- In , "haythemsalah" <hsalah@a...> wrote: > hello,
>
> I'm beginning with the ADSP 21992,
> I need to know the utility of the PAGE() operator,
> I didn't find more details in the ADSP documentation,
>
> thanks,
> Haithem




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RE: Re: PAGE operator - SALAH Haitem - Aug 7 6:54:00 2003


Here is an axample found in the ADSP documentation

static int globalTable[256]
int page;
asm("%0 = PAGE(GlobalTable);" : "=e" (page)::); -----Message d'origine-----
De : twd2950 [mailto:]
Envoyé : mer. 6 août 2003 20:03
À :
Objet : [adsp] Re: PAGE operator Where is this page operator mentioned?

For data memory, you have 2 data page registers (DMPG1 for DAG1 and
DMPG2 for DAG2). The IO processor also as a page register (IOPG).

Tim Dahlin

--- In , "haythemsalah" <hsalah@a...> wrote: > hello,
>
> I'm beginning with the ADSP 21992,
> I need to know the utility of the PAGE() operator,
> I didn't find more details in the ADSP documentation,
>
> thanks,
> Haithem
_____________________________________
/groups.php3






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Re: PAGE operator - twd2950 - Aug 8 0:56:00 2003

The "VisualDSP++ 3.0 C/C++ Compiler and Library Manual for ADSP-219x
DSPs" covers assembly language contructs on pages 1-64 to 1-68.

//Full listing from 1-91
#include <sysreg.h>
section("external_memory_section")
static int GlobalTable[256];
int main() {
int page, read_value, value_to_write = 0;
asm("%0 = PAGE(GlobalTable);
" : "=e"(page): : );
external_memory_write(page, &GlobalTable[0], value_to_write);
read_value = external_memory_read(page, &GlobalTable[1]);
return read_value;
}

The statement ("%0 = PAGE(GlobalTable);
" is geting the value of the page at which "GLOBALTABLE" is stored
(in this case it is stored within the "external_memory_section"
location... which is defined in the linker). The C/C++ macros,
external_memory_read and external_memory_write, are needed because
the 2191 only has a 16 bit memory pointers.

The DMPG1 and DMPG2 registers are used for the upper byte of the
address.

To answer your previous question, "PAGE()" allows you to get the
value of page at which a specific variable is stored.

For more information, check out the "VisualDSP++ 3.0 Assembler and
Preprocessor Manual for ADSP-218x and ADSP-219x DSPs".....

--- In , "SALAH Haitem" <hsalah@a...> wrote:
>
> Here is an axample found in the ADSP documentation
>
> static int globalTable[256]
> int page;
> asm("%0 = PAGE(GlobalTable);" : "=e" (page)::); > -----Message d'origine-----
> De : twd2950 [mailto:twd2950@y...]
> Envoyé : mer. 6 août 2003 20:03
> À :
> Objet : [adsp] Re: PAGE operator > Where is this page operator mentioned?
>
> For data memory, you have 2 data page registers (DMPG1 for DAG1 and
> DMPG2 for DAG2). The IO processor also as a page register (IOPG).
>
> Tim Dahlin
>
> --- In , "haythemsalah" <hsalah@a...> wrote:
> >
> >
> > hello,
> >
> > I'm beginning with the ADSP 21992,
> > I need to know the utility of the PAGE() operator,
> > I didn't find more details in the ADSP documentation,
> >
> > thanks,
> > Haithem >
> _____________________________________
> /groups.php3



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