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#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include <math.h>
#include <unistd.h>
#include <complex.h>
#include <hw/hw.h>
#include <hw/sdr.h>
#define SAMPLE_RATE 1000000
#define RESAMPLE_RATE 50000
#define CENTER_FREQ 101100000
#define FFT_LEVEL 12
#define FFT_SIZE (1 << FFT_LEVEL)
#define SAMPLE_LENGHT (2 * FFT_SIZE)
#define PRESCALE 8
#define POSTSCALE 2
void helper( char *exec_name )
{
const char help_str[]="Usage: ./%s [OPTIONS]\n\
-f [FREQ] - set center frequency\n\
-s [SAMPLE] - set sample rate\n\
-d [DEVICE] - choose device\n\
-r [RESAMPE] - set resample rate\n\
-? - print help\n\
";
printf( help_str, exec_name );
}
unsigned int super_atan( signed int x1, signed int y1 )
{
// Fast XY vector to integer degree algorithm - Jan 2011 www.RomanBlack.com
// Converts any XY values including 0 to a degree value that should be
// within +/- 1 degree of the accurate value without needing
// large slow trig functions like ArcTan() or ArcCos().
// NOTE! at least one of the X or Y values must be non-zero!
// This is the full version, for all 4 quadrants and will generate
// the angle in integer degrees from 0-360.
// Any values of X and Y are usable including negative values provided
// they are between -1456 and 1456 so the 16bit multiply does not overflow.
unsigned char negflag;
unsigned char tempdegree;
unsigned char comp;
unsigned int degree; // this will hold the result
signed int x=x1; // these hold the XY vector at the start
signed int y=y1; // (and they will be destroyed)
unsigned int ux;
unsigned int uy;
// Save the sign flags then remove signs and get XY as unsigned ints
negflag = 0;
if(x < 0)
{
negflag += 0x01; // x flag bit
x = (0 - x); // is now +
}
ux = x; // copy to unsigned var before multiply
if(y < 0)
{
negflag += 0x02; // y flag bit
y = (0 - y); // is now +
}
uy = y; // copy to unsigned var before multiply
// 1. Calc the scaled "degrees"
if(ux > uy)
{
degree = (uy * 45) / ux; // degree result will be 0-45 range
negflag += 0x10; // octant flag bit
}
else
{
degree = (ux * 45) / uy; // degree result will be 0-45 range
}
// 2. Compensate for the 4 degree error curve
comp = 0;
tempdegree = degree; // use an unsigned char for speed!
if(tempdegree > 22) // if top half of range
{
if(tempdegree <= 44) comp++;
if(tempdegree <= 41) comp++;
if(tempdegree <= 37) comp++;
if(tempdegree <= 32) comp++; // max is 4 degrees compensated
}
else // else is lower half of range
{
if(tempdegree >= 2) comp++;
if(tempdegree >= 6) comp++;
if(tempdegree >= 10) comp++;
if(tempdegree >= 15) comp++; // max is 4 degrees compensated
}
degree += comp; // degree is now accurate to +/- 1 degree!
// Invert degree if it was X>Y octant, makes 0-45 into 90-45
if(negflag & 0x10) degree = (90 - degree);
// 3. Degree is now 0-90 range for this quadrant,
// need to invert it for whichever quadrant it was in
if(negflag & 0x02) // if -Y
{
if(negflag & 0x01) // if -Y -X
degree = (180 + degree);
else // else is -Y +X
degree = (180 - degree);
}
else // else is +Y
{
if(negflag & 0x01) // if +Y -X
degree = (360 - degree);
}
return degree;
}
/*
Page about div
http://bisqwit.iki.fi/story/howto/bitmath/#DivAndModDivisionAndModulo
*/
uint8_t super_div20u8( uint16_t num )
{
uint16_t a = num;
uint16_t b = 20;
uint16_t r = 0;
uint16_t m = 1;
while ( b < a )
{
b = b << 1;
m = m << 1;
}
do
{
if ( a >= b )
{
a = a - b;
r = r + m;
}
b = b >> 1;
m = m >> 1;
} while ( m != 0 );
return (uint8_t)r;
}
void rotate_90(uint8_t *buf, uint32_t len)
/* 90 rotation is 1+0j, 0+1j, -1+0j, 0-1j
or [0, 1, -3, 2, -4, -5, 7, -6] */
{
uint32_t i;
uint8_t tmp;
for (i=0; i<len; i+=8) {
/* uint8_t negation = 255 - x */
tmp = 255 - buf[i+3];
buf[i+3] = buf[i+2];
buf[i+2] = tmp;
buf[i+4] = 255 - buf[i+4];
buf[i+5] = 255 - buf[i+5];
tmp = 255 - buf[i+6];
buf[i+6] = buf[i+7];
buf[i+7] = tmp;
}
}
float to_float(uint8_t x) {
return (1.0f/127.0f)*(((float)x)-127.0f);
}
//float ph_ch( uint8_t i1, uint8_t q1, uint8_t i2, uint8_t q2)
float ph_ch( uint8_t i1, uint8_t q1 )
{
static float complex last=CMPLXF(0.0f, 0.0f);
float out;
float complex xy,c1;
//float c2;
//c1 = to_float(i1) + I*to_float(q1);
c1 = CMPLXF( to_float(i1), to_float(q1) );
//c2 = to_float(i2) + I*to_float(q2);
//c2 = CMPLXF( to_float(i2), to_float(q2) );
xy = conjf(last)*c1;
out = cargf( xy );
last = c1;
return out;
}
int main( int argc, char **argv )
{
int c;
int ret;
int i,j,m;
uint8_t *buf, *sample_buf;
float *fbuf;
signed short *sound_buf;
int buf_len, sample_len;
//commandline config params
int config_device = 0;
uint32_t config_freq = CENTER_FREQ;
uint32_t config_sample_rate = SAMPLE_RATE;
uint32_t config_resample_rate = RESAMPLE_RATE;
sdr_t *sdr = NULL;
dongle_t *dongle = NULL;
// get all argument configs
opterr = 0;
while ( (c = getopt(argc, argv, "f:s:d:")) != -1 )
{
switch ( c )
{
case 'f':
config_freq = atoi( optarg );
break;
case 's':
config_sample_rate = atoi( optarg );
break;
case 'd':
//printf(" %s \n", optarg);
config_device = atoi( optarg );
break;
case '?':
helper( argv[0] );
break;
case ':':
printf("\n");
break;
default:
printf("Unknow option\n");
return -1;
}
}
if ( (sdr = sdr_init()) == NULL )
{
printf("Cannot init sdr manager\n");
sdr = NULL;
goto main_exit;
}
if ( sdr_open_device( sdr, config_device ) != 0 )
{
printf("MAIN:Cannot open device %d\n", config_device);
sdr->dongle = NULL;
goto main_exit;
}
dongle = sdr_get_device_id( sdr, config_device );
ret = 0;
ret != dongle_set_freq( dongle, config_freq );
ret != dongle_set_sample_rate( dongle, config_sample_rate );
ret != dongle_set_gain( dongle, 0 );
ret != dongle_set_agc( dongle, 10 );
if (ret != 0)
{
printf("Cannot properly config device\n");
}
sample_len = SAMPLE_LENGHT;
sample_buf = malloc( SAMPLE_LENGHT );
fbuf = malloc( SAMPLE_LENGHT*sizeof(float) );
sound_buf = malloc( (SAMPLE_LENGHT/20)*sizeof(signed short) );
while ( 1 )
{
//read plain samples
dongle_read_samples( dongle, sample_buf, SAMPLE_LENGHT );
//convert data to float
//for ( i=0; i<sample_len; i++)
//{
// fbuf[i] = to_float(sample_buf[i]);
//}
//delay
//rotate by 90 degrees uint8_t
//rotate_90( sample_buf, sample_len );
//with unsigned data phace change
#if 0
for (i=0,j=0; i<sample_len-2; i+=2,j++)
{
uint8_t c[2];
uint8_t *a=&sample_buf[i], *b=&sample_buf[i+2];
double angle;
float pcm;
c[0] = a[0]*b[0] - a[1]*b[1];
c[1] = a[1]*b[0] + a[0]*b[1];
angle = atan2((double)c[1],(double)c[0]);
pcm = (int)(angle / 3.14159 * (1<<14));
fbuf[j] = pcm;
}
#endif
//phase change with float
for (i=0; i<SAMPLE_LENGHT-4; i+=2)
{
//fbuf[i] = ph_ch( sample_buf[i], sample_buf[i+1],
// sample_buf[i+2], sample_buf[i+3] );
fbuf[i] = ph_ch( sample_buf[i], sample_buf[i+1]);
}
//downsample
//sample rate 1Mhz downsample to 50Khz
for ( i=0,m=0; i<SAMPLE_LENGHT; i+=20, m+=1 )
{
float sum=0.0;
for (j=i;j<i+20;j++)
{
sum += fbuf[j];
}
//sound_buf[m] = (signed short)(10000.0f*(sum/20.0));
sound_buf[m] = (signed short)(10000.0f*(sum/20.0));
}
write(1, sound_buf, ((SAMPLE_LENGHT/20)*sizeof(signed short)));
//play
//usleep(1);
//printf("Sample\n");
}
main_exit:
sdr_close(0);
return 0;
}
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