fixed point trigonometric functions for c6416.

Mariana,

Thanks for your reply. However, I still have the errors regarding some unresolved functions as follows:

I have included the following libs: csl6416.lib, dsp64x.lib, IQmath_c64x_v212.lib, rts6400.lib

BTW, I'm trying to use IQatan2 function.

undefined                        first referenced
 symbol                              in file
---------                        ----------------
_IQatan2Table                    C:\\CCStudio_v3.3\\c64plus\\IQmath_v213\\lib\\IQmath_c64x_v212.lib
_IQatan2HalfPITable              C:\\CCStudio_v3.3\\c64plus\\IQmath_v213\\lib\\IQmath_c64x_v212.lib
__mpy32ll                        C:\\CCStudio_v3.3\\c64plus\\IQmath_v213\\lib\\IQmath_c64x_v212.lib
_IQdivTable                      C:\\CCStudio_v3.3\\c64plus\\IQmath_v213\\lib\\IQmath_c64x_v212.lib
>>   error: symbol referencing errors - './Debug/sun_wg_dsp_dsk6416.out' not
            built

>> Compilation failure

Build Complete,
  2 Errors, 5 Warnings, 0 Remarks.

sm said:

__mpy32ll                        C:\\CCStudio_v3.3\\c64plus\\IQmath_v213\\lib\\IQmath_c64x_v212.lib

Searched a little and it seems that you need to implement some of the instrinsics that only work for C64x+ in C code (use optimization as in the forst post below):

https://e2e.ti.com/support/dsp/tms320c6000_high_performance_dsps/f/112/p/11853/46405.aspx#46405

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/99/p/7048/27375.aspx#27375

Do you have IQmah_RAM_c64x+.lib included?

http://e2e.ti.com/support/dsp/tms320c6000_high_performance_dsps/f/112/p/54332/192818.aspx#192818

Mariana,

Thanks for your help.

I have linked IQmath_RAM_C64x+.lib and also have created my own _mpy32ll() intrinsic replacement.

So, now I don't have any error regarding unresolved symbols or functions during the compilation and linking my codes.

However, the result of the function _IQatan2() is not correct. It does't work properly.

Is there any other trigonometric function libraries for c6416?

Or what else do I need to try to make this IQmath lib run correctly on C6416?

Hi sm,

sm said:

However, the result of the function _IQatan2() is not correct. It does't work properly.

What do you mean by wrong result? Can you be more specific?

If you want, attach your project and I can take a look at the results for you.

You can always use the regular RTS function, but as it will emulate floating point, it will take many more cycles than the IQmath:

#include <math.h>

void main()
{

float a, b;

b = 3.1416/4; //pi/4 = 45 degrees

a = tan(b);

b= atan(a);

}

Mariana, Thanks again for your reply. My test code is very simple. The result in out1 should be pi/4.

But the result from C6416 is always "0".

void main()
{
  float a;
  float b;
  float c;

  _iq xin1;
  _iq yin1;
  _iq out1;

  xin1 =_FtoIQ(0.5);
  yin1 =_FtoIQ(0.5);        
  out1=_IQatan2( yin1, xin1 );   // "out1" should be 13176794(dec), 0x00C90FDA, => 0.7854 (pi/4) in Q24. But it is always '0' in c6416.

  a = 0.5;
  b = 0.5;
  c = 0;
  c = atan(a/b);

}

The following is the part of my project file.

; Code Composer Project File, Version 2.0 (do not modify or remove this line)

[Project Settings]
ProjectDir="C:\svn\sun_wg_dspsw\"
ProjectType=Executable
CPUFamily=TMS320C64XX
Tool="Compiler"
Tool="CustomBuilder"
Tool="DspBiosBuilder"
Tool="Linker"
Tool="XDC"
Config="Debug"
Config="Release"

[Source Files]
Source="..\..\..\CCStudio_v3.3\c6400\dsplib\lib\dsp64x.lib"
Source="..\..\..\CCStudio_v3.3\c64plus\IQmath_v213\lib\IQmath_c64x_v212.lib"
Source="..\..\..\CCStudio_v3.3\c64plus\IQmath_v213\lib\IQmath_RAM_c64x+.lib"
Source="C:\CCStudio_v3.3\C6000\cgtools\lib\rts6400.lib"
Source="C:\CCStudio_v3.3\C6000\csl\lib\csl6416.lib"
Source="intvecs.asm"
Source="main.c"
Source="math_functions.c"
Source="rcv_functions.c"
Source="lnk_dsk6416.cmd"

Can you attach your full test project this way I can try to debug it?

Mariana,

How can I attach the files in the posting?

I cann't find any file attachment menu.

When you are replying, click on options on the top:

Mariana,

My project file. main.c, and link command file are zipped and attached.

Mariana,

I have attached new zip file (sun_wg_dspsw_new.zip).

The project file in the previous attachment has unnecessary customized header files, so I had removed them.

With the new project file, I could reproduced the problem, too.

Hi Sm,

It took me a while to figure this out. I had to generate a new library that contains the declaration to the "instrisics" inside of it:

extern long long _mpy32ll(int a, int b);
extern long long _mpy32su(int src1 , int src2);
extern long long _mpy32us(unsigned src1 , int src2);
extern long long _mpy32u(unsigned src1 , unsigned src2);

So use replace IQmath_c64x_v212.lib and IQmath_RAM_c64x+.lib with the IQmathC64x.lib attached to the post. So you still need the intrinsic-like function in your code, but the library inside has the declaration so it knows how to deal with the function.

Mariana, thanks for your help.

I replaced the IQmath_c64x_v212.lib and IQmath_RAM_c64x+.lib with the library (IQmath_c64x.lib) that  you have provided.
Also, I had added the following instrinsic functions in my codes.

long long _mpy32ll(int a, int b)
{
    return (long long)(a * b);
}
long long _mpy32su(int a, unsigned int b)
{
    return (long long)(a * b);
}
long long _mpy32us(unsigned int a, int b)
{
    return (long long)(a * b);
}
long long _mpy32u(unsigned int a, unsigned int b)
{
    return (long long)(a * b);
}

But I still have errors:

[Linking...] "C:\CCStudio_v3.3\C6000\cgtools\bin\cl6x" -@"Debug.lkf"
<Linking>
>> warning: creating output section $build.attributes without SECTIONS
            specification

undefined                        first referenced
 symbol                              in file
---------                        ----------------
__mpy32                          C:\\CCStudio_v3.3\\c64plus\\IQmath_v213\\lib\\IQmathC64x.lib
__dmv                            C:\\CCStudio_v3.3\\c64plus\\IQmath_v213\\lib\\IQmathC64x.lib
>>   error: symbol referencing errors - './Debug/sun_wg_dsp_dsk6416.out' not
            built

>> Compilation failure

Build Complete,
  2 Errors, 2 Warnings, 0 Remarks.
 
 
I have attached my project file with my source code.
Only change which I had made is adding intrinsic functions.
Would you take a look?

Hi sm,

See corrected project attached.

I had to:

- remove the template form the cmd file as it is a reserved name

- correct your mv option in the compiler options

- the intrinsics have to come before the iqmath.h inclusion.

- replace return (long long)(a * b); with return (long long)a * b; in the "intrinsics" functions

Hi sm,

Attached is a new version with all the intrinsics included (_mpy32 and _dmv as well). So you do not need to have the intrinsics in your project any more, I put them inside the library with -o3 and recompiled it.  So please try again with this new one if you have any problems.

Should work wih:

#define GLOBAL_Q (29)

#include "IQmath.h"

void main()
{

  _iq xin1;
  _iq yin1;
  _iq out1;

  xin1 =_FtoIQ(0.5);
  yin1 =_FtoIQ(0.5);        
  out1=_IQatan2( yin1, xin1 );  

}

Hello Mariana,

I would like to simulate the operation of a C6416 on a PC and also use the IQmath library.  I have downloaded the C6000 Host Instrinsics package, and I also have downloaded the IQmath source code for the C64x+.  But to get this to work for the C64x (not C64x+), I need the optimized C-code that implements the C64x+ instrinsics (_mpy32ll, _mpy32su, _mpy32us, _mpy32u, _mpy32, _dmv).  Is it possible to get this code?

Thank you,

-Rich