Sample FFT Code on F28335

Ava

Other Parts Discussed in Thread: CCSTUDIO, CONTROLSUITE, TMS320F28335

Hi,

I am trying to run sample code obtained from the C28x FFT library. When I try to run the 128 points real FFT project I get the following error:

fatal error: file
   "C:\\tidcs\\c28\\dsp_tbox\\fft\\cstb\\fft128r\\build\\Debug\\fftrd.obj" has
   a Tag_Memory_Model attribute value of "2" that is different than one
   previously seen ("1"); combining incompatible files

I've checked the build properties to see if all the files were being built as "large model". It seems to me that they are. I'm using CCStudio version 3.3.83.19. Can someone please help?

over 15 years ago

0 Yu Cai62050 over 15 years ago

Intellectual 810 points

you can try the one under http://focus.ti.com/docs/toolsw/folders/print/controlsuite.html

0 Ava over 15 years ago in reply to Yu Cai62050

Prodigy 200 points

Thanks Yu, but I tried the FFT code in Control Suite. I was unable to get that to work as well.

0 Yu Cai62050 over 15 years ago in reply to Ava

Intellectual 810 points

There must be something wrong in you set up, those example code only works for CCS4. If you r using ccs 3 u need to do some porting work. I don't have f28335 test board at this time. But i tested it in F2812 (128 pts) with CCS 3.1 it's working fine.

0 Ava over 15 years ago in reply to Yu Cai62050

Prodigy 200 points

I am using CCStudio v3.3. I am not sure what you mean by porting work?

0 Yu Cai62050 over 15 years ago in reply to Ava

Intellectual 810 points

CCS 4 has a macro file for defining relative path and would potentially mess up under CCS 3 environment. Porting means creating a new project in CCS 3 and put all of those source file , header file and lib source file in your new project and run it. If you don't know how to do that, try to find a working ccs 3 example from SPRC530 http://focus.ti.com/docs/toolsw/folders/print/sprc530.html and replace the functionality in main function with the fft code of main function in rfft.c. Replace the cmd file also. Added the necessary header file like fft.h into your project. If you don't know how to set up the lib path, just copy the source assembly file (controlSUITE/libs/dsp/FixedPointLib/v101/source/*.asm) into your project folder. Run it and compare the result with the result of the matlab script.

0 Ava over 15 years ago in reply to Yu Cai62050

Prodigy 200 points

I've tried a very similar process as well. When I try to compile to code I get an unresolved symbols error for DLOG_4CH_init & DLOG_4CH_update. I'm sure that if I can find the DLOG4CH library file that these errors should go away. I haven't had any luck finding that file on TI's website.

0 Yu Cai62050 over 15 years ago in reply to Ava

Intellectual 810 points

you can delete any symbol associated with DLOG4CH (data log 4 channels), that's from old legacy library and is useless for this fft code. it might not be cleaned up carefully. but in which file it complain about this symbol? in cmd file?

0 Ava over 15 years ago in reply to Yu Cai62050

Prodigy 200 points

It says that the files are first referenced in the fftrd.obj file.

Here is my fft main file code:

#include "stb.h"
#include "fft.h"

/* Create an instance of Signal generator module */
SGENTI_1 sgen = SGENTI_1_DEFAULTS;

/* Create an instance of DATALOG Module             */
DLOG_4CH dlog=DLOG_4CH_DEFAULTS;

/* Create an Instance of FFT module                 */
#define     N   256
#pragma DATA_SECTION(ipcb, "FFTipcb");
#pragma DATA_SECTION(mag, "FFTmag");

RFFT32 fft=RFFT32_256P_DEFAULTS;
long ipcb[N+2];
long mag[N/2+1];

/* Define window Co-efficient Array and place the
.constant section in ROM memory */
const long win[N/2]=HAMMING256;

/* Create an instance of FFTRACQ module             */
RFFT32_ACQ acq=FFTRACQ_DEFAULTS;

int xn,yn;

main()
{

/* DATALOG module initialisation                    */
       dlog.iptr1=&xn;
       dlog.iptr2=&yn;
       dlog.trig_value=0x800;
       dlog.size=0x400;         /* Can log 1024 Samples                      */
       dlog.init(&dlog);

/* Signal Generator module initialisation           */
       sgen.offset=0;
       sgen.gain=0x7fff;        /* gain=1 in Q15                              */
       sgen.freq=10000;         /* freq = (Required Freq/Max Freq)*2^15       */
                                /*      = (931/3051.7)*2^15 = 10000           */
       sgen.step_max=10000;     /* Max Freq= (step_max * sampling freq)/65536 */
                                /* Max Freq = (10000*20k)/65536 = 3051.7      */

/* Initialize acquisition module                    */
        acq.buffptr=ipcb;
        acq.tempptr=ipcb;
        acq.size=N;
        acq.count=N;
        acq.acqflag=1;

/* Initialize FFT module                            */
        fft.ipcbptr=ipcb;
        fft.magptr=mag;
        fft.winptr=(long *)win;
        fft.init(&fft);

/*---------------------------------------------------------------------------
Nothing running in the background at present
----------------------------------------------------------------------------*/

        while(1)
        {
            sgen.calc(&sgen);
            xn=sgen.out;
            yn=sgen.out;
            dlog.update(&dlog);

acq.input=((unsigned long)xn)<<16;
acq.update(&acq);

            if (acq.acqflag==0)     // If the samples are acquired
            {
                RFFT32_brev(ipcb,ipcb,N);
                RFFT32_brev(ipcb,ipcb,N); // Input samples in Real Part

//                fft.win(&fft);
                RFFT32_brev(ipcb,ipcb,N);
                RFFT32_brev(ipcb,ipcb,N); // Input after windowing

                fft.calc(&fft);
                fft.split(&fft);
                fft.mag(&fft);
                acq.acqflag=1;      // Enable the next acquisition
            }

}

} /* End: main() */

0 Yu Cai62050 over 15 years ago in reply to Ava

Intellectual 810 points

Please don't use these code. This is obsolete code and should be removed from the download list. Use the code under controlSUITE. http://focus.ti.com/docs/toolsw/folders/print/controlsuite.html

The rfft.c is under /TI/controlSUITE/libs/dsp/FixedPointLib/v101/examples_ccsv4/2833x_FixedPoint_RFFT

try to use that code to port to ur ccs 3.3

0 Ava over 15 years ago in reply to Yu Cai62050

Prodigy 200 points

I am now using code from /TI/controlSUITE/libs/dsp/FPU/v110/examples_ccsv4/2833x_RFFT. I don't have the above code you referred to.

I get the following errors when I compile the code:

undefined             first referenced
symbol                   in file
---------             ----------------
_InitPieCtrl          C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\fftrd.obj
_InitPieVectTable     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\fftrd.obj
_InitSysCtrl          C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\fftrd.obj
_RFFT_f32             C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\fftrd.obj
_RFFT_f32_mag         C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\fftrd.obj
_RFFT_f32_sincostable C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\fftrd.obj

0 Yu Cai62050 over 15 years ago in reply to Ava

Intellectual 810 points

_InitPieCtrl          /controlSUITE/device_support/f2833x/v132/DSP2833x_common/source/DSP2833x_PieCtrl
_InitPieVectTable     /controlSUITE/device_support/f2833x/v132/DSP2833x_common/source/DSP2833x_PieVect
_InitSysCtrl          /controlSUITE/device_support/f2833x/v132/DSP2833x_common/source/DSP2833x_SysCtrl
_RFFT_f32             /controlSUITE/libs/dsp/FixedPointLib/v101/source
_RFFT_f32_mag         /controlSUITE/libs/dsp/FixedPointLib/v101/source
_RFFT_f32_sincostable /controlSUITE/libs/dsp/FixedPointLib/v101/source

0 Ava over 15 years ago in reply to Yu Cai62050

Prodigy 200 points

I really appreciate all your help, but I am still struggling with this.

I am able to get the error for RFFT_f32_sincostable to go away.

I only have the assembly files for RFFT_f32_mag & RFFT_f32.

When just adding the first three .c files I get the following errors:

undefined        first referenced
symbol              in file
---------        ----------------
_ADCINT_ISR      C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_ADC_cal         C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_SysCtrl.obj
_CsmPwl          C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_SysCtrl.obj
_CsmRegs         C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_SysCtrl.obj
_DATALOG_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_DINTCH1_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_DINTCH2_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_DINTCH3_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_DINTCH4_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_DINTCH5_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_DINTCH6_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_DSP28x_usDelay C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_SysCtrl.obj
_ECAN0INTA_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_ECAN0INTB_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_ECAN1INTA_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_ECAN1INTB_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_ECAP1_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_ECAP2_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_ECAP3_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_ECAP4_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_ECAP5_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_ECAP6_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EMUINT_ISR      C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM1_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM1_TZINT_ISR C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM2_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM2_TZINT_ISR C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM3_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM3_TZINT_ISR C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM4_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM4_TZINT_ISR C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM5_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM5_TZINT_ISR C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM6_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EPWM6_TZINT_ISR C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EQEP1_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_EQEP2_INT_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_FlashRegs       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_SysCtrl.obj
_I2CINT1A_ISR    C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_I2CINT2A_ISR    C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_ILLEGAL_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_INT13_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_INT14_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_LUF_ISR         C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_LVF_ISR         C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_MRINTA_ISR      C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_MRINTB_ISR      C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_MXINTA_ISR      C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_MXINTB_ISR      C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_NMI_ISR         C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_PIE_RESERVED    C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_PieCtrlRegs     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieCtrl.obj
_PieVectTable    C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_RFFT_f32        C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\fftrd.obj
_RFFT_f32_mag    C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\fftrd.obj
_RTOSINT_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_SCIRXINTA_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_SCIRXINTB_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_SCIRXINTC_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_SCITXINTA_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_SCITXINTB_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_SCITXINTC_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_SEQ1INT_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_SEQ2INT_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_SPIRXINTA_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_SPITXINTA_ISR   C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_SysCtrlRegs     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_SysCtrl.obj
_TINT0_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER10_ISR      C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER11_ISR      C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER12_ISR      C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER1_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER2_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER3_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER4_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER5_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER6_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER7_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER8_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_USER9_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_WAKEINT_ISR     C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_XINT1_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_XINT2_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_XINT3_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_XINT4_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_XINT5_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_XINT6_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_XINT7_ISR       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj
_XintfRegs       C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_SysCtrl.obj
_rsvd_ISR        C:\\CCStudio_v3.3MCU\\MyProjects\\FFT_Sample Code\\Debug\\DSP2833x_PieVect.obj

0 Yu Cai62050 over 15 years ago in reply to Ava

Intellectual 810 points

u still has erros associated with these RFFT_f32_mag & RFFT_f32? then add all the *.asm file under /controlSUITE/libs/dsp/FixedPointLib/v101/source/*.asm into ur project folder.

you have so many erros means ur project doesn't have header files and common source file. in another word, u haven't set up ur environment correctly. What i suggest is use the example code under http://focus.ti.com/docs/toolsw/folders/print/sprc530.html. There are a bunch of ccs v3 example code, u don't touch the header file and common file, do the same thing. replace

the useless code in main function with the essential code in rfft.c. You would be able to get rid of these error. It will certainly take some time but if you are patient enough it will work for sure.

0 Ava over 15 years ago in reply to Yu Cai62050

Prodigy 200 points

Thank you for all your help. I was able to get it to run correctly. Thanks again.

0 wei li2 over 13 years ago in reply to Yu Cai62050

Prodigy 10 points

Hey, my target device is 2812. I wonder if i can use the FFT examples which is mainly for 28335 under controlSUITE. What modifications should i make?

Thank you!

0 Mihail1 over 13 years ago in reply to wei li2

Intellectual 320 points

Good afternoon.

I used the example RFFT of сontrolSUITE for processor TMS320F28335. The documentation specified at run time RFFT_f32 for different numbers input data. I checked with the help of input-output contacts.

GpioDataRegs.GPASET.bit.GPIO24 = 1;
RFFT_f32(&rfft); //Calculate real FFT
GpioDataRegs.GPACLEAR.bit.GPIO24 = 1;

Measured with an oscilloscope. Execution time is obtained in 10 times more than indicated in the documentation.

What is the problem?

0 Mihail1 over 13 years ago in reply to wei li2

Intellectual 320 points

Good afternoon.

I used the example RFFT of сontrolSUITE for processor TMS320F28335. The documentation specified at run time RFFT_f32 for different numbers input data. I checked with the help of input-output contacts.

GpioDataRegs.GPASET.bit.GPIO24 = 1;
RFFT_f32(&rfft); //Calculate real FFT
GpioDataRegs.GPACLEAR.bit.GPIO24 = 1;

Measured with an oscilloscope. Execution time is obtained in 10 times more than indicated in the documentation.

What is the problem?

0 Vishal_Coelho over 13 years ago in reply to Mihail1

TI__Mastermind 20850 points

Hi,

If you use the clock (debug perspective-> Target->Clock) what is the cycle count you get?

C2000™︎ microcontrollers

C2000 microcontrollers forum

Sample FFT Code on F28335