diff options
Diffstat (limited to 'test')
| -rw-r--r-- | test/ui_gl_waterfall.c | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/test/ui_gl_waterfall.c b/test/ui_gl_waterfall.c index 3eb3f1f..3c19aca 100644 --- a/test/ui_gl_waterfall.c +++ b/test/ui_gl_waterfall.c @@ -11,7 +11,7 @@ #define CENTER_FREQ 446500000 #define FFT_LEVEL 10 #define FFT_SIZE (1 << FFT_LEVEL) -#define BUF_LENGHT (2 * FFT_SIZE) +#define SAMPLE_LENGHT (2 * FFT_SIZE) #define PRESCALE 8 #define POSTSCALE 2 @@ -105,12 +105,15 @@ int normalise( uint8_t *ibuf, int ilen, uint8_t *obuf, int olen ) int i,j,m; int ppi; + /* if ( ilen >= olen ) { ppi = ilen / olen; } else { return -1; } + */ + ppi = 1; m = 0; i = 0; while ( (i < ilen) && (m < olen) ) @@ -221,29 +224,31 @@ int simple_fft( uint8_t *buf, int len ) { int i,j; uint16_t p; + uint16_t buf1[SAMPLE_LENGHT]; + uint16_t buf2[SAMPLE_LENGHT]; int fft_len; for (i=0; i<len; i++) { - buf[i] = buf[i] * PRESCALE; + buf1[i] = buf[i] * PRESCALE; } - fix_fft( (uint16_t *)buf, FFT_LEVEL ); + fix_fft( (uint16_t *)buf1, FFT_LEVEL ); - for (i=0; i<FFT_SIZE; i++) + for (i=0; i<FFT_SIZE; i+=1) { //buf1[i] = rtl_out.buf[i]; //p = buf1[i] * buf1[i]; j = i*2; - p = (int16_t)real_conj(buf[j], buf[j + 1]); - buf[i] += p; + p = (int16_t)real_conj(buf1[j], buf1[j + 1]); + buf2[i] = p; } fft_len = FFT_SIZE / 2; for (i=0; i<fft_len; i++) { - buf[i] = (int)log10(POSTSCALE * (float)buf[i+fft_len]); - buf[i+fft_len] = (int)log10(POSTSCALE * (float)buf[i]); + buf[i] = (int)log10(POSTSCALE * (float)buf2[i+fft_len]); + buf[i+fft_len] = (int)log10(POSTSCALE * (float)buf2[i]); } return 0; @@ -291,10 +296,11 @@ int main() goto main_exit; } + //screen normilised buffer to draw buf_len = sizeof(char)*w->w; buf = malloc( buf_len ); - sample_len = BUF_LENGHT; + sample_len = SAMPLE_LENGHT; sample_buf = malloc( sample_len ); srand(0); //fake seed @@ -307,16 +313,16 @@ int main() sdr_get_samples( sample_buf, sample_len ); //do fft - simple_fft( sample_buf, sample_len/2 ); + simple_fft( sample_buf, sample_len ); //prepare to show on the screen - if (normalise( sample_buf, sample_len/2, buf, buf_len ) == -1) + //if (normalise( sample_buf, sample_len, buf, buf_len ) == -1) { - printf("Cannot normalise\n"); + //printf("Cannot normalise\n"); } - glui_waterfall_data( t, buf_len, buf ); + glui_waterfall_data( t, sample_len/2, sample_buf ); //printf("\n\b"); - usleep(100000); + usleep(10000); } main_exit: |