Code Composer Library/out files and Time domain graph display problem

Hi guys,

I am using Code Composer 3.1 for my final year project  and I tried to generate a random noise using Chassaing book’s , “Digital Signal Processing and Applications with the C6713 and C6416 DSK”, example of “Noise_gen”

When I rebuild the project the following error displayed

“"Noise_gen.c", line 3: fatal error: could not open source file "DSK6713_AIC23.h"

On my Pc “include” and “lib” files are located in C:\CCStudio_v3.1\C6000\dsk6713\include  and  C:\CCStudio_v3.1\C6000\dsk6713\lib

So, I use the “project build option” and added the include search path for the pre-processor section and also the Library search path for the linker.

The project builds successfully and I got the “Noise_gen.out” in the debug folder. However, when I load the out file to the board I couldn’t hear the noise on the mic out. Whenever I load Chassaing’s exaple of “Noise_gen.out” I can hear the noise but after rebuilding and loading the recent “Noise_gen.out” I couldn’t.

Is this something to do with the library and include path? If so how can I fix it?

The second problem:  unable to display the right magnitude of Time domain graph

I used the following setup in graph property dialog to display the noise in Time domain and connected Prob point using “Noise_gen.c” on line 22 at  output_sample(prnseq)  function

Start Address -Output_sample

Acquisition buffer Size -2048

Index increment- 1

Display data size - 2048

DSP data type  - 32-bit signed integer

Sampling arte -8000

Maximum Y-value - 10,000

Part of the code of  Noise_gen.c

interrupt void c_int11()           //interrupt service routine
{
 short prnseq;                       //for pseudo-random sequence
 
 if(sreg.bt.b0)                    //sequence{1,-1}based on bit b0
prnseq = -8000;                    //scaled negative noise level
 else
prnseq = 8000;                   //scaled positive noise level
 fb  =(sreg.bt.b0)^(sreg.bt.b1);   //XOR bits 0,1
 fb ^=(sreg.bt.b11)^(sreg.bt.b13); //with bits 11,13 ->fb
 sreg.regval<<=1;                  //shift register 1 bit to left
 sreg.bt.b0 = fb;                                //close feedback path
                         
 output_sample(prnseq);                   //output scaled sequence
 return;                                     //return from interrupt

The out put will be either 1 or 0 and it is scaled by 80000 for display purposes.

So, I am expecting +8000 or -8000. However, the graph always display more of 10,000 and a couple of -10000

Did I miss any setup information? Why the graph displayed the maximum scale (+10000,-10000) rather than displaying 8000 or -8000?

Could you please advise me what I need to do to fix those problems?

Thanks,

Gim