daniel/lolra
1
0
Fork 0
mirror of https://github.com/cnlohr/lolra.git synced 2026-06-17 00:09:31 +00:00
Code Issues Packages Projects Releases Wiki Activity

Initial Commit

Browse Source
This commit is contained in:
cnlohr
2024-03-24 17:33:38 -07:00
commit 6948175113
82 changed files with 22401 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tools/60-rtlsdr.rules
+2
View File
@@ -0,0 +1,2 @@
# Realtek Semiconductor Corp. RTL2838 DVB-T
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="2838", MODE:="0666", GROUP="adm", SYMLINK+="rtl_sdr"
tools/Makefile
+17
View File
@@ -0,0 +1,17 @@
all : complex_magsink_to_image image_color.png image.png
magsink_to_image : magsink_to_image.c
gcc -o $@ $^ -O3
complex_magsink_to_image : complex_magsink_to_image.c
gcc -o $@ $^ -O3 -lm
image_color.png : complex_magsink_to_image /tmp/samplelog_I.dat /tmp/samplelog_Q.dat
./complex_magsink_to_image
image.png : magsink_to_image /tmp/samplelog.dat
./magsink_to_image
clean :
rm -rf magsink_to_image complex_magsink_to_image
tools/README.md
+14
View File
@@ -0,0 +1,14 @@
# LoRasoft tools
testloradec.grc uses https://github.com/tapparelj/gr-lora_sdr
and is currently configured for an airspy.
But you can configure it for whatever.
If you do a run, it also records a file to /tmp/samplelog.dat
Which if you only record for about 1 second, you can convert into an image with `magsink_to_image.c` which outputs `image.png` so you can examine the stream.
If you want to compromise the signal, making it wider to get better granularity at the cost of temporal resolution, you can change FFTSIZE (in grc) to a different power of two. Then you can update the `int width = 512;` in `magsink_to_image.c` to convert it to the right width for examination.
tools/complex_magsink_to_image.c
+196
View File
@@ -0,0 +1,196 @@
/*
MIT License
Copyright (c) 2024 Charles Lohr "CNLohr"
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <math.h>
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"
uint32_t HSVtoHEX( float hue, float sat, float value );
int main()
{
FILE * f = fopen( "/tmp/samplelog_I.dat", "rb" );
if( !f ) { fprintf( stderr, "Error: can't open /tmp/samplelog_I.dat\n" ); exit( -59 ); }
fseek( f, 0, SEEK_END );
int len = ftell( f );
fseek( f, 0, SEEK_SET );
len/=sizeof(float);
float * data_I = malloc( len * sizeof( float ) );
int i;
for( i = 0; i < len; i++ )
{
float val;
int r = fread( &val, 1, sizeof(float), f );
data_I[i] = val;
}
f = fopen( "/tmp/samplelog_Q.dat", "rb" );
if( !f ) { fprintf( stderr, "Error: can't open /tmp/samplelog_Q.dat\n" ); exit( -59 ); }
fseek( f, 0, SEEK_END );
len = ftell( f );
fseek( f, 0, SEEK_SET );
len/=sizeof(float);
float * data_Q = malloc( len * sizeof( float ) );
float * data_M = malloc( len * sizeof( float ) );
for( i = 0; i < len; i++ )
{
float val;
int r = fread( &val, 1, sizeof(float), f );
data_Q[i] = val;
}
int width = 1024;
int height = len / width;
uint32_t * outimage = malloc( sizeof( uint32_t ) * width * height );
int y, x;
float hueofs = 0.0;
for( y = 0; y < height; y++ )
{
float linemin = 1e20;
float linemax = -1e20;
for( x = 0; x < width; x++ )
{
float I = data_I[x+y*width];
float Q = data_Q[x+y*width];
//I= sqrtf(I*I);
//Q= sqrtf(Q*Q);
data_I[x+y*width] = I;
data_Q[x+y*width] = Q;
data_M[x+y*width] =
//log( sqrtf( I*I + Q*Q ) );
sqrtf( I*I + Q*Q );
}
int highestindex = 0;
for( x = 0; x < width; x++ )
{
float M = data_M[x+y*width];
if( M < linemin ) linemin = M;
if( M > linemax ) { linemax = M; highestindex = x; }
}
for( x = 0; x < width; x++ )
{
float I = data_I[x+y*width];
float Q = data_Q[x+y*width];
float M = data_M[x+y*width];
float Mm = ( M - linemin ) / (linemax - linemin);
float hue = (((atan2( I, Q ) / 3.1415926)+1)/2.0);
// hue = phase (0 to 1)
//hue += y * 0.16666666666;
// Wat? Why 18? I literally can't figure it out.
hue *= 18; // It can be 9 if we add an offset of 0.5 per pixel, but then things get out of sync.
// /hue *= 3;
hueofs += 0.466*2.0/1024.0; // .46666 "would" be perfect but striation helps us see the signal.
hue += hueofs;
if( hueofs >= 1.0 ) hueofs -= 1.0;
outimage[x+y*width] = HSVtoHEX( hue, 1.0, Mm ) | 0xff000000;
// if( x == highestindex && M > 1.0 ) printf( "%f %f %08x\n", M, hue, outimage[x+y*width] );
}
}
stbi_write_png( "image_color.png", width, height, 4, outimage, width*4 );
}
uint32_t HSVtoHEX( float hue, float sat, float value )
{
float pr = 0.0;
float pg = 0.0;
float pb = 0.0;
short ora = 0.0;
short og = 0.0;
short ob = 0.0;
float ro = fmod( hue * 6.0, 6.0 );
float avg = 0.0;
ro = fmod( ro + 6.0 + 1.0, 6.0 ); //Hue was 60* off...
if( ro < 1.0 ) //yellow->red
{
pr = 1.0;
pg = 1.0 - ro;
} else if( ro < 2.0 )
{
pr = 1.0;
pb = ro - 1.0;
} else if( ro < 3.0 )
{
pr = 3.0 - ro;
pb = 1.0;
} else if( ro < 4.0 )
{
pb = 1.0;
pg = ro - 3.0;
} else if( ro < 5.0 )
{
pb = 5.0 - ro;
pg = 1.0;
} else
{
pg = 1.0;
pr = ro - 5.0;
}
//Actually, above math is backwards, oops!
pr *= value;
pg *= value;
pb *= value;
avg += pr;
avg += pg;
avg += pb;
pr = pr * sat + avg * (1.0-sat);
pg = pg * sat + avg * (1.0-sat);
pb = pb * sat + avg * (1.0-sat);
ora = pr * 255;
og = pb * 255;
ob = pg * 255;
if( ora < 0 ) ora = 0;
if( ora > 255 ) ora = 255;
if( og < 0 ) og = 0;
if( og > 255 ) og = 255;
if( ob < 0 ) ob = 0;
if( ob > 255 ) ob = 255;
// Pack bits in RGBA format
return (ora << 0) | (og << 8) | (ob << 16);
}
tools/magsink_to_image.c
+82
View File
@@ -0,0 +1,82 @@
/*
MIT License
Copyright (c) 2024 Charles Lohr "CNLohr"
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"
int main()
{
FILE * f = fopen( "/tmp/samplelog.dat", "rb" );
if( !f ) { fprintf( stderr, "Error: can't open /tmp/samplelog.dat\n" ); exit( -59 ); }
fseek( f, 0, SEEK_END );
int len = ftell( f );
fseek( f, 0, SEEK_SET );
len/=sizeof(float);
float * data = malloc( len * sizeof( float ) );
float fMin = 1e20;
float fMax = -1e20;
int i;
for( i = 0; i < len; i++ )
{
float val;
int r = fread( &val, 1, sizeof(float), f );
if( val > fMax ) fMax = val;
if( val < fMin ) fMin = val;
data[i] = val;
}
int width = 1024;
int height = len / width;
uint32_t * outimage = malloc( sizeof( uint32_t ) * width * height );
int y, x;
for( y = 0; y < height; y++ )
{
float linemin = 1e20;
float linemax = -1e20;
for( x = 0; x < width; x++ )
{
float v = data[x+y*width];
if( v < linemin ) linemin = v;
if( v > linemax ) linemax = v;
data[x+y*width] = v;
}
for( x = 0; x < width; x++ )
{
float v = data[x+y*width];
int intensity = (v - linemin) / (linemax - linemin) * 255.5 * 2 - 256;
if( intensity < 0 ) intensity = 0;
if( intensity > 255 ) intensity = 255;
outimage[x+y*width] = (intensity) | (intensity<<8) | (intensity<<16) | 0xff000000;
}
}
stbi_write_png( "image.png", width, height, 4, outimage, width*4 );
}
tools/stb_image_write.h
+1725
View File
File diff suppressed because it is too large Load Diff
tools/testloradec.grc
+1230
View File
File diff suppressed because it is too large Load Diff