FFT.rar_TMS320F2808

// TI File $Revision: /main/3 $ // Checkin $Date: December 3, 2004 13:39:29 $ // Modified by LSD_Hanbing to suit the LSD_EVM320F2801X, April 24,2007 //########################################################################### // // FILE: Example_281xGpioToggle.c // // TITLE: DSP280x Device GPIO toggle test program. // // ASSUMPTIONS: // // This program requires the DSP280x header files. // // GPIO0-7 TOGGLE IN THIS PROGRAM. MAKE SURE // THIS WILL NOT DAMAGE YOUR HARDWARE BEFORE RUNNING THIS // EXAMPLE. // // Monitor GPIO0-7 on the LED2-LED9. // // As supplied, this project is configured for "boot to SARAM" // operation. The 280x Boot Mode table is shown below. // For information on configuring the boot mode of an LSD_EVM320F2801X, // please refer to the documentation included with the LSD_EVM320F2801X, // // Boot GPIO18 GPIO29 GPIO34 // Mode SPICLKA SCITXDA // SCITXB // ------------------------------------- // Flash 1 1 1 // SCI-A 1 1 0 // SPI-A 1 0 1 // I2C-A 1 0 0 // ECAN-A 0 1 1 // SARAM 0 1 0 <- "boot to SARAM" // OTP 0 0 1 // I/0 0 0 0 // // // DESCRIPTION: // // Three different examples are included. Select the example // (data, set/clear or toggle) to execute before compiling using // the #define statements found at the top of the code. // // //########################################################################### // $TI Release: DSP280x, DSP2801x Header Files V1.41 $ // $Release Date: August 7th, 2006 $ //########################################################################### #include "DSP280x_Device.h" // DSP280x Headerfile Include File #include "DSP280x_Examples.h" // DSP280x Examples Include File #include"math.h" // Select the example to compile in. Only one example should be set as 1 // the rest should be set as 0. #define EXAMPLE1 0 // Use DATA registers to toggle I/O's #define EXAMPLE2 0 // Use SET/CLEAR registers to toggle I/O's #define EXAMPLE3 1 // Use TOGGLE registers to toggle I/O's // Prototype statements for functions found within this file. void delay_loop(void); void Gpio_select(void); void Gpio_example1(void); #define PI 3.1415926 #define SAMPLENUMBER 128 void InitForFFT(); void MakeWave(); //void FFT(float dataR[SAMPLENUMBER],float dataI[SAMPLENUMBER]); int INPUT[SAMPLENUMBER],DATA[SAMPLENUMBER]; //float fWaveR[SAMPLENUMBER],fWaveI[SAMPLENUMBER]; float w[SAMPLENUMBER]; float sin_tab[SAMPLENUMBER],cos_tab[SAMPLENUMBER]; void FFT(float dataR[SAMPLENUMBER],float dataI[SAMPLENUMBER]) { int x0,x1,x2,x3,x4,x5,x6,xx; int i,j,k,b,p,L; float TR,TI,temp; /********** following code invert sequence ************/ for ( i=0;i<SAMPLENUMBER;i++ ) { x0=x1=x2=x3=x4=x5=x6=0; x0=i&0x01; x1=(i/2)&0x01; x2=(i/4)&0x01; x3=(i/8)&0x01;x4=(i/16)&0x01; x5=(i/32)&0x01; x6=(i/64)&0x01; xx=x0*64+x1*32+x2*16+x3*8+x4*4+x5*2+x6; dataI[xx]=dataR[i]; } for ( i=0;i<SAMPLENUMBER;i++ ) { dataR[i]=dataI[i]; dataI[i]=0; } /************** following code FFT *******************/ for ( L=1;L<=7;L++ ) { /* for(1) */ b=1; i=L-1; while ( i>0 ) { b=b*2; i--; } /* b= 2^(L-1) */ for ( j=0;j<=b-1;j++ ) /* for (2) */ { p=1; i=7-L; while ( i>0 ) /* p=pow(2,7-L)*j; */ { p=p*2; i--; } p=p*j; for ( k=j;k<128;k=k+2*b ) /* for (3) */ { TR=dataR[k]; TI=dataI[k]; temp=dataR[k+b]; dataR[k]=dataR[k]+dataR[k+b]*cos_tab[p]+dataI[k+b]*sin_tab[p]; dataI[k]=dataI[k]-dataR[k+b]*sin_tab[p]+dataI[k+b]*cos_tab[p]; dataR[k+b]=TR-dataR[k+b]*cos_tab[p]-dataI[k+b]*sin_tab[p]; dataI[k+b]=TI+temp*sin_tab[p]-dataI[k+b]*cos_tab[p]; } /* END for (3) */ } /* END for (2) */ } /* END for (1) */ for ( i=0;i<SAMPLENUMBER/2;i++ ) { w[i]=sqrt(dataR[i]*dataR[i]+dataI[i]*dataI[i]); } } /* END FFT */ void InitForFFT() { int i; for ( i=0;i<SAMPLENUMBER;i++ ) { sin_tab[i]=sin(PI*2*i/SAMPLENUMBER); cos_tab[i]=cos(PI*2*i/SAMPLENUMBER); } } void MakeWave() { int i; for ( i=0;i<SAMPLENUMBER;i++ ) { INPUT[i]=sin(PI*2*i/SAMPLENUMBER*3)*1024; } } void main(void) { int i; float fWaveR[SAMPLENUMBER],fWaveI[SAMPLENUMBER]; // Step 1. Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP280x_SysCtrl.c file. InitSysCtrl(); // Step 2. Initalize GPIO: // This example function is found in the DSP280x_Gpio.c file and // illustrates how to set the GPIO to it's default state. // InitGpio(); // Skipped for this example // For this example use the following configuration: Gpio_select(); // Step 3. Clear all interrupts and initialize PIE vector table: // Disable CPU interrupts DINT; // Initialize PIE control registers to their default state. // The default state is all PIE interrupts disabled and flags // are cleared. // This function is found in the DSP280x_PieCtrl.c file. InitPieCtrl(); // Disable CPU interrupts and clear all CPU interrupt flags: IER = 0x0000; IFR = 0x0000; // Initialize the PIE vector table with pointers to the shell Interrupt // Service Routines (ISR). // This will populate the entire table, even if the interrupt // is not used in this example. This is useful for debug purposes. // The shell ISR routines are found in DSP280x_DefaultIsr.c. // This function is found in DSP280x_PieVect.c. InitPieVectTable(); // Step 4. Initialize all the Device Peripherals: // This function is found in DSP280x_InitPeripherals.c // InitPeripherals(); // Not required for this example InitForFFT(); MakeWave(); for ( i=0;i<SAMPLENUMBER;i++ ) { fWaveR[i]=INPUT[i]; fWaveI[i]=0.0f; w[i]=0.0f; } FFT(fWaveR,fWaveI); for ( i=0;i<SAMPLENUMBER;i++ ) { DATA[i]=w[i]; } for(;;) { } //break point } void Gpio_select(void) { EALLOW; GpioCtrlRegs.GPAMUX1.all = 0x00000000; // All GPIO GpioCtrlRegs.GPAMUX2.all = 0x00000000; // All GPIO GpioCtrlRegs.GPAMUX1.all = 0x00000000; // All GPIO GpioCtrlRegs.GPADIR.all = 0xFF; // GPIO0-7 outputs EDIS; } //=========================================================================== // No more. //===========================================================================