Aim

To Generate a Square wave form using TMS320C6745 DSP KIT.

Requirements

☞CCS v4

☞TMS320C6745 KIT

☞USB Cable

☞5V Adapter

Theory

Square waves have an interesting mix of practice and theory. In practice, they are extremely simple. In their simplest form, they consist of an alternating sequence of amplitudes; e.g. high/low or 1’s and 0’s.

The same high / low logic here we implented in experiment. For particular duration the high state is out , then low state is out. Finally square wave is generated and plotted in code composer studio Graph.

Procedure for build a project on Square wave generation using TMS320C6745 DSP

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 iconand 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 few seconds generate samples)

13. TARGET ⇒ HALT.

14. TOOLS ⇒ GRAPH ⇒ SINGLE TIME

☞Acquirstion buffer size : 1000

☞Index increment : 1

☞Start address : 0xC0000000.

☞Display data size : 1000 → Ok.

Program for Square wave generation using TMS320C6745 DSP

#include 

void main()

{

        int *Square;

        int i;

        Square = (int *)0xC0000000;

        while(1)

        {

                for(i=0;i<50;i++)

                {

                        *Square++ = 0x0000FFFF;

                }

                for(i=0;i<50;i++)

                {

                        *Square++ = 0x0;

                }

        }

}

Result

Thus, the Square waveform was generated and samples is stored at memory location(0xC0000000).