FIX: fixed a little bug I introduced from last commit in fskdemod

[proxmark3-svn] / client / graph.c

diff --git a/client/graph.c b/client/graph.c
index 98dc80436db6f5660400d7d22d7a7f9fe5bf9a4b..d0f6fe74fce36b1f1e6a2fd1a9ae73f14c82f6ef 100644 (file)
--- a/client/graph.c
+++ b/client/graph.c
@@ -13,6 +13,7 @@
 #include <string.h>
 #include "ui.h"
 #include "graph.h"
+#include "lfdemod.h"
 
 int GraphBuffer[MAX_GRAPH_TRACE_LEN];
 int GraphTraceLen;
@@ -21,11 +22,13 @@ int GraphTraceLen;
 void AppendGraph(int redraw, int clock, int bit)
 {
   int i;
-
-  for (i = 0; i < (int)(clock / 2); ++i)
-    GraphBuffer[GraphTraceLen++] = bit ^ 1;
+  int half = (int)(clock/2);
+  int firstbit = bit ^ 1;
+ 
+  for (i = 0; i < half; ++i)
+    GraphBuffer[GraphTraceLen++] = firstbit;
   
-  for (i = (int)(clock / 2); i < clock; ++i)
+  for (i = 0; i <= half; ++i)
     GraphBuffer[GraphTraceLen++] = bit;
 
   if (redraw)
@@ -46,60 +49,69 @@ int ClearGraph(int redraw)
   return gtl;
 }
 
-/*
- * Detect clock rate
- */
-int DetectClock(int peak)
+void SetGraphBuf(uint8_t *buff, int size) 
 {
-  int i;
-  int clock = 0xFFFF;
-  int lastpeak = 0;
-
-  /* Detect peak if we don't have one */
-  if (!peak)
-    for (i = 0; i < GraphTraceLen; ++i)
-      if (GraphBuffer[i] > peak)
-        peak = GraphBuffer[i];
-
-  for (i = 1; i < GraphTraceLen; ++i)
-  {
-    /* If this is the beginning of a peak */
-    if (GraphBuffer[i - 1] != GraphBuffer[i] && GraphBuffer[i] == peak)
-    {
-      /* Find lowest difference between peaks */
-      if (lastpeak && i - lastpeak < clock)
-        clock = i - lastpeak;
-      lastpeak = i;
-    }
-  }
-
-  return clock;
+       if ( buff == NULL ) return;
+       
+       uint16_t i = 0;  
+       if ( size > MAX_GRAPH_TRACE_LEN )
+               size = MAX_GRAPH_TRACE_LEN;
+       ClearGraph(0);
+       for (; i < size; ++i){
+               GraphBuffer[i] = buff[i];
+       }
+       GraphTraceLen = size;
+       RepaintGraphWindow();
+       return;
 }
 
+// Copies grahpbuff to buff. 
+// while triming values to the range -127 -- 127.
+int GetFromGraphBuf(uint8_t *buff)
+{
+       if ( buff == NULL ) return -1;
+       uint32_t i = 0;
+       
+       for (; i < GraphTraceLen; ++i){
+       
+               // trim upper and lower values.
+               if (GraphBuffer[i] > 127) 
+                       GraphBuffer[i] = 127;
+               else if (GraphBuffer[i] < -127)
+                       GraphBuffer[i] = -127;
+                       
+               buff[i] = (uint8_t)(GraphBuffer[i] + 128);
+       }
+       return i;
+}
 /* Get or auto-detect clock rate */
-int GetClock(const char *str, int peak, int verbose)
+int GetClock(const char *str, int verbose)
 {
-  int clock;
-
-  sscanf(str, "%i", &clock);
-  if (!strcmp(str, ""))
-    clock = 0;
-
-  /* Auto-detect clock */
-  if (!clock)
-  {
-    clock = DetectClock(peak);
-    /* Only print this message if we're not looping something */
-    if (!verbose)
-      PrintAndLog("Auto-detected clock rate: %d", clock);
-  }
-
-  return clock;
+       int clock;
+
+       sscanf(str, "%i", &clock);
+       if (!strcmp(str, ""))
+               clock = 0;
+
+       /* Auto-detect clock */
+       if (!clock) {
+
+               uint8_t grph[MAX_GRAPH_TRACE_LEN] = {0x00};
+               int size = GetFromGraphBuf(grph);
+               if ( size < 0 ) {
+                       PrintAndLog("Failed to copy from graphbuffer");
+                       return -1;
+               }
+               clock = DetectASKClock(grph, size, 0);
+
+               /* Only print this message if we're not looping something */
+               if (verbose)
+                       PrintAndLog("Auto-detected clock rate: %d", clock);
+               }
+       return clock;
 }
 
-
-/* A simple test to see if there is any data inside Graphbuffer. 
-*/
+// A simple test to see if there is any data inside Graphbuffer. 
 bool HasGraphData(){
 
        if ( GraphTraceLen <= 0) {
@@ -107,4 +119,26 @@ bool HasGraphData(){
                return false;
        }
        return true;    
+}
+
+// Detect high and lows in Grapbuffer.
+// Only loops the first 256 values. 
+void DetectHighLowInGraph(int *high, int *low, bool addFuzz) {
+
+       uint8_t loopMax = 255;
+       if ( loopMax > GraphTraceLen)
+               loopMax = GraphTraceLen;
+  
+       for (uint8_t i = 0; i < loopMax; ++i) {
+               if (GraphBuffer[i] > *high)
+                       *high = GraphBuffer[i];
+               else if (GraphBuffer[i] < *low)
+                       *low = GraphBuffer[i];
+       }
+       
+       //12% fuzz in case highs and lows aren't clipped
+       if (addFuzz) {
+               *high = (int)(*high * .88);
+               *low  = (int)(*low  * .88);
+       }
 }
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