コード例 #1
0
void main(void) {
    const short m = 31;
    volatile short fr[31];
    overlay volatile short fi[31];
    struct Classification classification;
    setup();
    LATCbits.LATC2 = 1;
    while(1) {
        ISRflag = 0;
        LATCbits.LATC0 = 0;
        // fill fr and/or fi from ADC (details to come)
        fix_fft(fr, fi, m);
        classification = *classify(fr, fi);
        // if something set vibrate pin
        // print classification(s) to LCD
        while(1) {
            Delay10TCYx(1);
            LATCbits.LATC1 = 1;
            if(ISRflag) {
                break;
            }
            LATCbits.LATC1 = 0;
        }
    }
}
コード例 #2
0
ファイル: vis.cpp プロジェクト: Coolstreamto/Coolto
static void do_fft(gint16 out_data[], gint16 in_data[])
{
	gint16 im[SAMPLES];

	memset(im, 0, sizeof(im));
	window(in_data, SAMPLES);
	fix_fft(in_data, im, LOG, 0);
	fix_loud(out_data, in_data, im, SAMPLES/2, 0);
}
コード例 #3
0
void test( const char* label, char* data )
{
    for( int i=0; i<NUM_SAMPLES; i++ )
    {
        mImagData[i] = 0;
    }
    fix_fft( data, mImagData, 6, 0 );
    Magnitude( mMagnitude, data, mImagData, NUM_SAMPLES/2 );
    ComPrintDataUchar( label, mMagnitude, NUM_SAMPLES/2 );
}
コード例 #4
0
ファイル: plat_avr.c プロジェクト: nesl/splt
void fft_task( void )
{
  static fixed    imag[NFFT];
  static uint16_t i = 0;
  TASK_BEGIN();
	
  while(1) {
    TASK_SEM_WAIT(&data_ready);
    led_red_toggle();
    for(i = 0; i < NFFT; i++) {
      imag[i] = 0;
    }
    // compute FFT from 512 samples, the routines takes 200 ms
    fix_fft(processing_buf, imag, M, 0);
    processing_buf = NULL;
    led_green_toggle();
  }
  TASK_END();
}
コード例 #5
0
ファイル: Sound.cpp プロジェクト: bguest/DKPendant
void Sound::run(){

  signed int val;

  for (uint8_t i=0; i < SAMPLES_COUNT; i++){
    val = analogRead(MIC_PIN);
    data[i] = val / 2 - 128;
    im[i] = 0;
  }

  //this could be done with the fix_fftr function without the im array.
  fix_fft(data,im,BANDS_COUNT,0);

  // this gets the absolute value of the values in the array, so we're only dealing with positive numbers
  for (uint8_t i=0; i< SAMPLES_COUNT;i++){
    data[i] = sqrt(data[i] * data[i] + im[i] * im[i]);
  };


  // Bands
  for(uint8_t i=0; i < AVG_BANDS_COUNT; i++){
    _bandAmp[i] = 0;
    for(uint8_t j = 0; j < BAND_WIDTH/4; j++){
      _bandAmp[i] += data[i*BAND_WIDTH/4 + j];
    }
    if(_bandAmp[i] > maxBandAmp[i]){
      maxBandAmp[i] = _bandAmp[i];
    }
  }

  // Volume
  _volume = 0;
  for(uint8_t i = 0; i < AVG_BANDS_COUNT ; i++){
    _volume += _bandAmp[i];
  }
  if(_volume > maxVolume){
    maxVolume = _volume;
  }


}
コード例 #6
0
ファイル: perimeter.cpp プロジェクト: Arduinology/ardumower
void PerimeterClass::filterFrequencyMagnitude(byte idx){
  mag[idx] = 0;          
  int8_t im[FFTBINS];
  memset(im, 0, sizeof im);      
  int8_t *samples = ADCMan.getCapture(idxPin[idx]);    
  //if (idx == 0) printADCMinMax(samples);
  fix_fft(samples, im, 7, 0);              
  //digitalWrite(pinLED, LOW);    
  for (byte i=0; i < FFTBINS/2; i++){      
    int v = sqrt(samples[i] * samples[i] + im[i] * im[i]);      
    allmag[i] = max(allmag[i], v);
    if (i > 0) { // ignore 50 Hz band
     // find overall frequencies peak (peak)
      if (v > peakV){
        peakV = v;
        peakBin = i;
      }
    }
    if (i == BANDPASS_BIN) { 
      // bandpass  
      //analogWrite(LED, min(255, v));
      mag[idx] = max(mag[idx], v);        
      //mag[channel] += v;                
      peak[idx] = max(peak[idx], v);                         
      //if (v > 20) digitalWrite(pinLED, HIGH);          
    }            
  }     
  //if (idx ==0) Serial.println(mag[idx]);
  ADCMan.restart(idxPin[idx]);
  if (millis() >= nextTime){      
    nextTime = millis() + 1000;
    int sum = peak[0] + peak[1];
    //printResults();
    peak[0]=0;
    peak[1]=0;
    peakV = 0;
    peakBin = 0;      
  }     
}
コード例 #7
0
ファイル: rtl_power.c プロジェクト: pinkavaj/rtl-sdr
void scanner(void)
{
	int i, j, j2, f, n_read, offset, bin_e, bin_len, buf_len, ds, ds_p;
	int32_t w;
	struct tuning_state *ts;
	bin_e = tunes[0].bin_e;
	bin_len = 1 << bin_e;
	buf_len = tunes[0].buf_len;
	for (i=0; i<tune_count; i++) {
		if (do_exit >= 2)
			{return;}
		ts = &tunes[i];
		f = (int)rtlsdr_get_center_freq(dev);
		if (f != ts->freq) {
			retune(dev, ts->freq);}
		rtlsdr_read_sync(dev, ts->buf8, buf_len, &n_read);
		if (n_read != buf_len) {
			fprintf(stderr, "Error: dropped samples.\n");}
		/* rms */
		if (bin_len == 1) {
			rms_power(ts);
			continue;
		}
		/* prep for fft */
		for (j=0; j<buf_len; j++) {
			fft_buf[j] = (int16_t)ts->buf8[j] - 127;
		}
		ds = ts->downsample;
		ds_p = ts->downsample_passes;
		if (boxcar && ds > 1) {
			j=2, j2=0;
			while (j < buf_len) {
				fft_buf[j2]   += fft_buf[j];
				fft_buf[j2+1] += fft_buf[j+1];
				fft_buf[j] = 0;
				fft_buf[j+1] = 0;
				j += 2;
				if (j % (ds*2) == 0) {
					j2 += 2;}
			}
		} else if (ds_p) {  /* recursive */
			for (j=0; j < ds_p; j++) {
				downsample_iq(fft_buf, buf_len >> j);
			}
			/* droop compensation */
			if (comp_fir_size == 9 && ds_p <= CIC_TABLE_MAX) {
				generic_fir(fft_buf, buf_len >> j, cic_9_tables[ds_p]);
				generic_fir(fft_buf+1, (buf_len >> j)-1, cic_9_tables[ds_p]);
			}
		}
		remove_dc(fft_buf, buf_len / ds);
		remove_dc(fft_buf+1, (buf_len / ds) - 1);
		/* window function and fft */
		for (offset=0; offset<(buf_len/ds); offset+=(2*bin_len)) {
			// todo, let rect skip this
			for (j=0; j<bin_len; j++) {
				w =  (int32_t)fft_buf[offset+j*2];
				w *= (int32_t)(window_coefs[j]);
				//w /= (int32_t)(ds);
				fft_buf[offset+j*2]   = (int16_t)w;
				w =  (int32_t)fft_buf[offset+j*2+1];
				w *= (int32_t)(window_coefs[j]);
				//w /= (int32_t)(ds);
				fft_buf[offset+j*2+1] = (int16_t)w;
			}
			fix_fft(fft_buf+offset, bin_e);
			if (!peak_hold) {
				for (j=0; j<bin_len; j++) {
					ts->avg[j] += real_conj(fft_buf[offset+j*2], fft_buf[offset+j*2+1]);
				}
			} else {
				for (j=0; j<bin_len; j++) {
					ts->avg[j] = MAX(real_conj(fft_buf[offset+j*2], fft_buf[offset+j*2+1]), ts->avg[j]);
				}
			}
			ts->samples += ds;
		}
	}
コード例 #8
0
ファイル: main.c プロジェクト: geledek/FPGAFFT
int main(void)
{
    short real[N], image[N];
    float datacpx[N];
    int outLED[N];
    int i,j,window;
    int timeL;
    print("FFT start\n");

    Xil_Out32(OLED_BASE_ADDR,0xff);
	OLED_Init();
	OLED_ShowString(0,0, "Hello FFT!");
	OLED_Refresh_Gram();
	//srand(time(0));
	
	while(1){
		init_timer(timer_ctrl, timer_counter_l, timer_counter_h);
		start_timer(timer_ctrl);
		OLED_Clear();
		for (i = 0; i < N; i++) outLED[i] = 0;
		for(window = 0; window<WINDOW; ++window)
		{
			//Generate input data
			for (i = 0; i < N; i++)
			{
#ifdef FIX_POINT
				real[i] = ((rand()%128-64)/128.0f)*(1<<14);
				image[i] = 0;
#else
				//datacpx[2*i]=(cos(2 * M_PI * 4 * i / N));
				datacpx[2*i]=(rand()%128-64)/128.0f;
				datacpx[2*i+1] = 0;
#endif
			}
			timeL = *timer_counter_l;
			//FFT
#ifdef FIX_POINT
			fix_fft(real, image, POW_N);
#else
			fft(datacpx,N,1);
#endif
			printf("FFT: %d us\n",(*timer_counter_l - timeL)/333);

			timeL = *timer_counter_l;
			//Conj
			for (i = 0; i < N; i++)
			{
#ifdef FIX_POINT
				//printf("real[%d]= %d image[%d]= %d\n",i,real[i],i,image[i]);
				int conj_pdt_out =sqrt((real[i]*real[i]) + (image[i]*image[i]));
#else
				int conj_pdt_out =sqrt((datacpx[2*i]*datacpx[2*i]) + (datacpx[2*i+1]*datacpx[2*i+1]));
#endif
				//conj_pdt_out=conj_pdt_out/2;
				outLED[i]+=conj_pdt_out;
			}
			printf("Conj: %d us\n",(*timer_counter_l - timeL)/333);
		}
		timeL = *timer_counter_l;
		//Averaging
		for(i=0;i<N;++i)
		{
#ifdef FIX_POINT
			outLED[i]=outLED[i]>>10;
#else
			outLED[i]=outLED[i]/8;
#endif
		}
		printf("Averaging: %d us\n",(*timer_counter_l - timeL)/333);
		stop_timer(timer_ctrl);

		//Display
		for(i=0;i<N;++i)
		{
			//printf("real[%d]= %d image[%d]= %d\n",i,real[i],i,image[i]);
			for(j=0; j< outLED[i]; ++j)
				OLED_DrawPoint(i,63-j,1);
		}
		OLED_Refresh_Gram();
	}
    return 0;
}
コード例 #9
0
ファイル: Sound.c プロジェクト: tv/battleship
void SR_FFT( short * real, short * imag, short samples_exp )
{
		fix_fft(real, imag, samples_exp, 0);
}
コード例 #10
0
ファイル: main.c プロジェクト: rafmudaf/integerFFT
int main(int argc, char* argv[])
{
/**************************** config **********************************/
    int N = 512;
    int scaleby = 16384;
/**********************************************************************/

    if ( argc != 3 ) {
        printf( "usage: %s input-file-name output-file-name\n", argv[0] );
        return 1;
    }
    char* fin = argv[1];
    char* fout = argv[2];
    
    int i,j,axis;
    int nLines = getNumberOfLines(fin);
    int log2nLines = fix_log2(nLines);
    int padLines = (1<<(log2nLines+1)) - nLines;
    int dataLines = 1<<(log2nLines+1);

    // FFT size and input signal size
    int log2n = fix_log2(N);
    int loops = dataLines>>log2n;

    // read CSV and pad with 0's until the next power of 2^m
    readCSV(fin, 6, 0, nLines);
    for ( i=0; i<padLines; ++i ) {
        for ( axis=0; axis<6; ++axis ) {
            dataIn[nLines+i][axis] = 0;
        }
    }

    for ( axis=0; axis<6; ++axis ) {
    
        // remove the mean, keep only signal with amp > 1, and scale the data
        int sum = 0, mean = 0;
        for ( j=0; j<nLines; j++ ) {
            sum += dataIn[j][axis];
        }    
        mean = sum>>log2nLines;
        for ( j=0; j<nLines; j++ ) {
            dataIn[j][axis] -= mean;
        }
        int scalefactor = fix_log2(scaleby);
        for ( j=0; j<nLines; j++ ) {
            if (dataIn[j][axis] != 0) {
                dataIn[j][axis] <<= scalefactor;
            }
        }

        // loop over the data in N segments and FFT
        int re[N], im[N], amp[N];
        for ( j=0; j<N; ++j ) { amp[j] = 0; }
        for ( j=0; j<loops; ++j ) {
            for( i=0; i<N; i++ ) {
                im[i] = 0;
                re[i] = dataIn[N*j+i][axis];
            }

            // compute the FFT of the samples
            fix_fft(re,im,log2n,0);

            for (i=1; i<N; i++){
                amp[i] += re[i]*re[i] + im[i]*im[i];
            }
        }

        // average the frequency-bin amplitudes over nonzero sampled dataset
        int nonzeros = 0;
        for ( j=0; j<N; ++j ) {
            if ( amp[j] != 0 ) ++nonzeros;
        }
        for ( j=1; j<N; j++ ) {
            amp[j] = sqrt(amp[j]);
            amp[j] >>= fix_log2(nonzeros);
        }
        
        // store in six-axis array
        for ( j=0; j<N; ++j ) {
            ampFull[j][axis] = amp[j];
        }
    }

    writeCSV(fout, ampFull, 6, N/2);

    return 0;
}