CHG: according to measureement by @wilrn the actual timing for receiving tag data...

[proxmark3-svn] / client / ui.c

diff --git a/client/ui.c b/client/ui.c
index c0d01bc32983a2efb313f99640d745ce3af8cde9..cfaec6a510dcfaadfe4edc725a41eeddf461097c 100644 (file)
--- a/client/ui.c
+++ b/client/ui.c
@@ -9,19 +9,11 @@
 // UI utilities
 //-----------------------------------------------------------------------------
 
-#include <stdarg.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <time.h>
-#include <readline/readline.h>
-#include <pthread.h>
-
 #include "ui.h"
-
 double CursorScaleFactor;
 int PlotGridX, PlotGridY, PlotGridXdefault= 64, PlotGridYdefault= 64;
 int offline;
-int flushAfterWrite = 0;  //buzzy
+int flushAfterWrite = 0;
 extern pthread_mutex_t print_lock;
 
 static char *logfilename = "proxmark3.log";
@@ -32,13 +24,13 @@ void PrintAndLog(char *fmt, ...)
        int saved_point;
        va_list argptr, argptr2;
        static FILE *logfile = NULL;
-       static int logging=1;
+       static int logging = 1;
 
        // lock this section to avoid interlacing prints from different threats
        pthread_mutex_lock(&print_lock);
   
        if (logging && !logfile) {
-               logfile=fopen(logfilename, "a");
+               logfile = fopen(logfilename, "a");
                if (!logfile) {
                        fprintf(stderr, "Can't open logfile, logging disabled!\n");
                        logging=0;
@@ -77,16 +69,96 @@ void PrintAndLog(char *fmt, ...)
        }
        va_end(argptr2);
 
-       if (flushAfterWrite == 1)  //buzzy
-       {
+       if (flushAfterWrite == 1) {
                fflush(NULL);
        }
        //release lock
        pthread_mutex_unlock(&print_lock);  
 }
 
+void SetLogFilename(char *fn) {
+  logfilename = fn;
+}
+ 
+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);
+       
+       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 array
+    float complex x_prime  = 1.0f;   // save sample for estimating frequency
+    float complex x;
+               
+       for (i = 0; i < adjustedLen; ++i) {
+
+               sample = data[i];
+               
+        // remove DC offset and mix to complex baseband
+        x = (sample - 127.5f) * cexpf( _Complex_I * 2 * M_PI * fc * i );
+
+        // apply low-pass filter, removing spectral image (IIR using direct-form II)
+        iir_buf[2] = iir_buf[1];
+        iir_buf[1] = iir_buf[0];
+        iir_buf[0] = x - a[1]*iir_buf[1] - a[2]*iir_buf[2];
+        x          = b[0]*iir_buf[0] +
+                     b[1]*iir_buf[1] +
+                     b[2]*iir_buf[2];
+                                        
+        // compute instantaneous frequency by looking at phase difference
+        // between adjacent samples
+        float freq = cargf(x*conjf(x_prime));
+        x_prime = x;    // retain this sample for next iteration
+
+               output[i] =(freq > 0) ? 127 : -127;
+    } 
+
+       // show data
+       //memcpy(data, output, adjustedLen);
+       for (j=0; j<adjustedLen; ++j)
+               data[j] = output[j];
+       
+       free(output);
+}
+
+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){
 
-void SetLogFilename(char *fn)
+               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;
+       }
+}
+
+float complex cexpf (float complex Z)
 {
-  logfilename = fn;
+  float complex  Res;
+  double rho = exp (__real__ Z);
+  __real__ Res = rho * cosf(__imag__ Z);
+  __imag__ Res = rho * sinf(__imag__ Z);
+  return Res;
 }