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Aim

To Generate a sinewave form using TMS320C6745 DSP KIT.

Requirements

 

Theory

The simplest method to generate Sine wave is to use Trignometric Sin function. The Sin function will generate the samples from our specific parameter like sampling frequency, number of samples, input frequency. In this project, generating the correct sample is important. The library function "sin()" does all of the work.

sine-wave

Its most basic form as a function of time (t) is:

sine-wave-formula

where:

A, the amplitude, is the peak deviation of the function from its center position.

ω, the angular frequency, specifies how many oscillations occur in a unit time interval, in radians per second

φ, the phase, specifies where in its cycle the oscillation begins at t = 0.

When the phase is non-zero, the entire waveform appears to be shifted in time by the amount f/? seconds. A negative value represents a delay, and a positive value represents an advance.

Procedure

1. Open Code Composer Studio v4 .

2. In WorkSpace Launcher.

  • BROWSE → Select the project location and make one new folder, MAKE NEW FOLDER → Type the Workspace name, OK → OK.

3. FILE ⇒ NEW ⇒ CCS PROJECT

  • Project name: Type your project name.
  • Tick use default location. → NEXT
  • Project type C6000.
  • Tick Debug And Release. → NEXT → NEXT.
  • Output type: Executable.
  • Device Variant : generic - TMS320C6745.
  • Device Endianness : little
  • Code Generation Tools: TI v6.1.12.
  • Run time support library: automatic.
  • Target content: none. →FINISH
4.FILE ⇒ NEW ⇒ SOURCE FILE
  • Source file: Type your projectname.c( .c extension is must ).
  • Type the program.
  • FILE → SAVE.

5. Paste the following board library files in workspace location.

  • Common folder (contains header files)
  • Gel folder (contains gel file)
  • Library folder(contains library files)

6. Paste the Linker file in the project location.(linker file is available in cd)

Note: Those folders and linker file are availble at cd.

7. PROJECT ⇒ PROPERTIES ⇒ C/C++ BUILD → BASIC OPTION

  • Target processor version(--silicon version, -mv)    :   6400+ OK.
  • IN C/C++ BUILD, INCLUDE OPTIONS (Add dir to #include search path(--include_path,-I)) select this add icon add-icon and add the following three path by indivdually    -  "${Diag}../../common/header"    -  "${XDAIS_CG_ROOT}/packages/ti/xdais"    -  "${C6000_CSL_CG_ROOT}/include"

8. FILE ⇒ NEW ⇒ TARGET CONFIGURATION FILE

  • file name: projectname. ccxml (.ccxml extension is must)
  • Connection: Texas Instrument XDS100 v1 USB Emulator.
  • Device: TMS320C6745. (Tick the TMS320C6745)→ SAVE → TARTGET CONFIGURATION → C674X_0 → BROWSE, browse the workspace location, open the gel folder and select the GEL file. → OPEN → SAVE.

9. In C/C++ Project window, Right click the project ⇒ REBUILD PROJECT.

10. Connections

  • Connect the usb cable, PC to TMS320C6745 KIT
  • Connect the 5v adapter.
  • Power on the kit.

11. TARGET ⇒ DEBUG ACTIVE PROJECT.

12. TARGET ⇒ RUN. (wait to generate samples)

13. TARGET ⇒ HALT.

14. TOOLS ⇒ GRAPH ⇒ SINGLE TIME

  • Acquirstion buffer size : 256
  • Index increment : 1
  • Start address : 0xC0000000.
  • Display data size : 256 → Ok.

Program

 
#include

#include

#define PI 3.14

 

void main()

{

        const float sampf = 1024000.0;// Sampling frquency is fixed

        const int inpf = 4000; // change the input frquency from 1khz to 8khz(1000 to 8000)

        float sampt;

        double teta;

        short value,*sinout;

        int i,count,nsamp,value1;

 

        sinout = (short *)0xc0000000;

        sampt = 1/sampf;

        nsamp = sampf/inpf;

       

        printf("\n Sampling Frequency is : %f",sampf);

        printf("\n Sampling Time is :%f",sampt);

        printf("\n Input Frequency is : %d",inpf);

        printf("\n The number of Sample is : %d",nsamp);

 

        for(i=0;i<400;i++)

                *(sinout+i)=0;

       

               

                for(count=0;count<nsamp;count++)

                {

                        teta = (2 * PI * inpf * sampt * count);

                        printf("\nteta = %lf",teta);

               

                        value = sin(teta)*1024;

                        printf("\t sin %lf Value is : %d",teta,value);

                       

                        value1 = value&0x0000FFFF;

                        *sinout++ = value1;

                }

       

}

Result

Thus, the Sine waveform generation was generated and the sine samples is stored at memory location(0xc0000000).