X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/45293f1096a2fae3fbdad5f90248929cd9c6f562..25d52dd261bc454dafeedc31c9b3d62b8832b23a:/client/ui.c

diff --git a/client/ui.c b/client/ui.c
index 48a55b1f..cfaec6a5 100644
--- a/client/ui.c
+++ b/client/ui.c
@@ -80,27 +80,31 @@ 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);	
+	if ( !output ) return;
+	
+	// clear mem
 	memset(output, 0x00, len);
-	float fc           = 0.1125f;          // center frequency
-	size_t adjustedLen = len;
 	
+	size_t adjustedLen = len;
+	float fc = 0.1125f;          // center frequency
+		
     // create very simple low-pass filter to remove images (2nd-order Butterworth)
     float complex iir_buf[3] = {0,0,0};
     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) {
+	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 );
@@ -118,71 +122,36 @@ void iceFsk3(int * data, const size_t len){
         float freq = cargf(x*conjf(x_prime));
         x_prime = x;    // retain this sample for next iteration
 
-		output[i] =(freq > 0)? 10 : -10;
+		output[i] =(freq > 0) ? 127 : -127;
     } 
 
 	// show data
+	//memcpy(data, output, adjustedLen);
 	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);
+	free(output);
+}
 
-	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 );
+void iceSimple_Filter(int *data, const size_t len, uint8_t k){
+// ref: http://www.edn.com/design/systems-design/4320010/A-simple-software-lowpass-filter-suits-embedded-system-applications
+// parameter K
+#define FILTER_SHIFT 4 
+
+	int32_t filter_reg = 0;
+	int16_t input, output;
+	int8_t shift = (k <=8 ) ? k : FILTER_SHIFT;
+
+	for (int i = 0; i < len; ++i){
+
+		input = data[i];
+		// Update filter with current sample
+		filter_reg = filter_reg - (filter_reg >> shift) + input;
+
+		// Scale output for unity gain
+		output = filter_reg >> shift;
+		data[i] = output;
 	}
-	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);
 }
 
 float complex cexpf (float complex Z)