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From: kkadin on 6 May 2008 02:33
Dear Everybody.



I'm using CCStudio v3.3 with the DM642 EVM and XDS560R debugger.

I coded my algorithm with ANSI c library, But It didn't give me enough
performance.

So I have been trying to apply IQMath library and found two odd
situations.



FIRST.

when I ran the codes below, iq_c was 0.0001xx.

Wasn't iq_c supposed to be 2 ?



iq_a = _IQ13(1);

iq_b = _IQ13(2);

iq_c = _IQ13mpy(iq_a,iq_b);





SECOND.

whenever I called _IQsqrt(), the system was down.

All calls with individual line below made the system goes down.



#define GLOBAL_Q 13



q_r = _IQsqrt(100);

q_r = _IQsqrt(-200000);

q_r = _IQsqrt(200000);

_IQsqrt(100);

_IQsqrt(_IQ(100));



Thanks.
From: kkadin on 7 May 2008 05:45
thanks for the reply. but I think I have a long way to go.

After I included a custom .cmd file, the modified project well
compiled.
But the functions in IQMath library don't work the same as before.

I have tried to include custom .cmd file which has below sentenses.

MEMORY
{
ERAM_01 : o = 0x81000000, l = 0x00100000
}
SECTIONS
{
..data:IQmathTables : > ERAM_01
..text:IQmath : > ERAM_01
}

Because I'm modifying one of video example in Evaluation board
package which have a cmd file
configured

MEMORY {
ISRAM : origin = 0x0, len = 0x20000
SDRAM : origin = 0x80000000, len = 0x2000000
}

so I changed memory configuration in DSP/BIOS GUI config menu,
then the cmd file was updated automatically.

MEMORY {
ISRAM : origin = 0x0, len = 0x20000
SDRAM : origin = 0x80000000, len = 0x1f00000
SDRAM_IQMATH : origin = 0x81f00000, len = 0x0100000
}

Then I tried to add new sections in GUI configuration tool.
But I was not able to find where I can add SECTIONS, So I just added a
new cmd file which has

SECTIONS
{
..data:IQmathTables : > SDRAM_IQMATH
..text:IQmath : > SDRAM_IQMATH
}

This is all I did today.

Thanks for any reply you will post. ^^;
From: Brad Griffis on 7 May 2008 08:00
kkadin(a)gmail.com wrote:
> Dear Everybody.
>
>
>
> I'm using CCStudio v3.3 with the DM642 EVM and XDS560R debugger.
>
> I coded my algorithm with ANSI c library, But It didn't give me enough
> performance.
>
> So I have been trying to apply IQMath library and found two odd
> situations.
>
>
>
> FIRST.
>
> when I ran the codes below, iq_c was 0.0001xx.
>
> Wasn't iq_c supposed to be 2 ?
>
>
>
> iq_a = _IQ13(1);
>
> iq_b = _IQ13(2);
>
> iq_c = _IQ13mpy(iq_a,iq_b);
>
>
>
>
>
> SECOND.
>
> whenever I called _IQsqrt(), the system was down.
>
> All calls with individual line below made the system goes down.
>
>
>
> #define GLOBAL_Q 13
>
>
>
> q_r = _IQsqrt(100);
>
> q_r = _IQsqrt(-200000);
>
> q_r = _IQsqrt(200000);
>
> _IQsqrt(100);
>
> _IQsqrt(_IQ(100));
>
>
>
> Thanks.

Where did you get the IQmath library, ie what is the lit number? I see
one for the 28x and one for the 64x+. The DM642 is a 64x device so I
wouldn't expect this to work unless of course you found a version for 64x.

Brad
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