RfidResearchGroup/proxmark3
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removed some old code,

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rename a function, that tries to add IIRfilter Butterworth on a signal.  Lets see if I can get it to work on Graphbuffer data one of these days.
This commit is contained in:
iceman1001 2016-04-05 04:51:06 +02:00
parent a81b99b9b1
commit 9e43f09ade
2 changed files with 5 additions and 62 deletions
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65
client/ui.c
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@ -80,13 +80,13 @@ void SetLogFilename(char *fn) {
logfilename = fn;
}
void iceFsk3(int * data, const size_t len){
void iceIIR_Butterworth(int *data, const size_t len){
int i,j;
int * output = (int* ) malloc(sizeof(int) * len);
memset(output, 0x00, len);
float fc = 0.1125f; // center frequency
float fc = 0.1125f; // center frequency
size_t adjustedLen = len;
// create very simple low-pass filter to remove images (2nd-order Butterworth)
@ -94,13 +94,13 @@ void iceFsk3(int * data, const size_t len){
float b[3] = {0.003621681514929, 0.007243363029857, 0.003621681514929};
float a[3] = {1.000000000000000, -1.822694925196308, 0.837181651256023};
float sample = 0; // input sample read from file
float sample = 0; // input sample read from array
float complex x_prime = 1.0f; // save sample for estimating frequency
float complex x;
for (i=0; i<adjustedLen; ++i) {
sample = data[i]+128;
sample = data[i];
// remove DC offset and mix to complex baseband
x = (sample - 127.5f) * cexpf( _Complex_I * 2 * M_PI * fc * i );
@ -125,63 +125,6 @@ void iceFsk3(int * data, const size_t len){
for (j=0; j<adjustedLen; ++j)
data[j] = output[j];
CmdLtrim("30");
adjustedLen -= 30;
// zero crossings.
for (j=0; j<adjustedLen; ++j){
if ( data[j] == 10) break;
}
int startOne =j;
for (;j<adjustedLen; ++j){
if ( data[j] == -10 ) break;
}
int stopOne = j-1;
int fieldlen = stopOne-startOne;
fieldlen = (fieldlen == 39 || fieldlen == 41)? 40 : fieldlen;
fieldlen = (fieldlen == 59 || fieldlen == 51)? 50 : fieldlen;
if ( fieldlen != 40 && fieldlen != 50){
printf("Detected field Length: %d \n", fieldlen);
printf("Can only handle 40 or 50. Aborting...\n");
free(output);
return;
}
// FSK sequence start == 000111
int startPos = 0;
for (i =0; i<adjustedLen; ++i){
int dec = 0;
for ( j = 0; j < 6*fieldlen; ++j){
dec += data[i + j];
}
if (dec == 0) {
startPos = i;
break;
}
}
printf("000111 position: %d \n", startPos);
startPos += 6*fieldlen+5;
int bit =0;
printf("BINARY\n");
printf("R/40 : ");
for (i =startPos ; i < adjustedLen; i += 40){
bit = data[i]>0 ? 1:0;
printf("%d", bit );
}
printf("\n");
printf("R/50 : ");
for (i =startPos ; i < adjustedLen; i += 50){
bit = data[i]>0 ? 1:0;
printf("%d", bit ); }
printf("\n");
free(output);
}

2
client/ui.h
View file

@ -40,5 +40,5 @@ extern int PlotGridX, PlotGridY, PlotGridXdefault, PlotGridYdefault;
extern int offline;
extern int flushAfterWrite; //buzzy
void iceFsk3(int * data, const size_t len);
void iceIIR_Butterworth(int * data, const size_t len);
#endif