git.zerfleddert.de Git - proxmark3-svn/blob - client/graph.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // Graph utilities
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <stdbool.h>
  13 #include <string.h>
  14 #include "ui.h"
  15 #include "graph.h"
  16 #include "lfdemod.h"
  17
  18 int GraphBuffer[MAX_GRAPH_TRACE_LEN];
  19 int GraphTraceLen;
  20
  21 /* write a bit to the graph */
  22 void AppendGraph(int redraw, int clock, int bit)
  23 {
  24   int i;
  25   int half = (int)(clock/2);
  26   int firstbit = bit ^ 1;
  27
  28   for (i = 0; i < half; ++i)
  29     GraphBuffer[GraphTraceLen++] = firstbit;
  30
  31   for (i = 0; i <= half; ++i)
  32     GraphBuffer[GraphTraceLen++] = bit;
  33
  34   if (redraw)
  35     RepaintGraphWindow();
  36 }
  37
  38 /* clear out our graph window */
  39 int ClearGraph(int redraw)
  40 {
  41   int gtl = GraphTraceLen;
  42   memset(GraphBuffer, 0x00, GraphTraceLen);
  43
  44   GraphTraceLen = 0;
  45
  46   if (redraw)
  47     RepaintGraphWindow();
  48
  49   return gtl;
  50 }
  51
  52 void SetGraphBuf(uint8_t *buff, int size)
  53 {
  54         if ( buff == NULL ) return;
  55
  56         uint16_t i = 0;
  57         if ( size > MAX_GRAPH_TRACE_LEN )
  58                 size = MAX_GRAPH_TRACE_LEN;
  59         ClearGraph(0);
  60         for (; i < size; ++i){
  61                 GraphBuffer[i] = buff[i];
  62         }
  63         GraphTraceLen = size;
  64         RepaintGraphWindow();
  65         return;
  66 }
  67
  68 // Copies grahpbuff to buff.
  69 // while triming values to the range -127 -- 127.
  70 int GetFromGraphBuf(uint8_t *buff)
  71 {
  72         if ( buff == NULL ) return -1;
  73         uint32_t i = 0;
  74
  75         for (; i < GraphTraceLen; ++i){
  76
  77                 // trim upper and lower values.
  78                 if (GraphBuffer[i] > 127)
  79                         GraphBuffer[i] = 127;
  80                 else if (GraphBuffer[i] < -127)
  81                         GraphBuffer[i] = -127;
  82
  83                 buff[i] = (uint8_t)(GraphBuffer[i] + 128);
  84         }
  85         return i;
  86 }
  87 /* Get or auto-detect clock rate */
  88 int GetClock(const char *str, int verbose)
  89 {
  90         int clock;
  91
  92         sscanf(str, "%i", &clock);
  93         if (!strcmp(str, ""))
  94                 clock = 0;
  95
  96         /* Auto-detect clock */
  97         if (!clock) {
  98
  99                 uint8_t grph[MAX_GRAPH_TRACE_LEN] = {0x00};
 100                 int size = GetFromGraphBuf(grph);
 101                 if ( size < 0 ) {
 102                         PrintAndLog("Failed to copy from graphbuffer");
 103                         return -1;
 104                 }
 105                 clock = DetectASKClock(grph, size, 0);
 106
 107                 /* Only print this message if we're not looping something */
 108                 if (verbose)
 109                         PrintAndLog("Auto-detected clock rate: %d", clock);
 110                 }
 111         return clock;
 112 }
 113
 114 // A simple test to see if there is any data inside Graphbuffer.
 115 bool HasGraphData(){
 116
 117         if ( GraphTraceLen <= 0) {
 118                 PrintAndLog("No data available, try reading something first");
 119                 return false;
 120         }
 121         return true;
 122 }
 123
 124 // Detect high and lows in Grapbuffer.
 125 // Only loops the first 256 values.
 126 void DetectHighLowInGraph(int *high, int *low, bool addFuzz) {
 127
 128         uint8_t loopMax = 255;
 129         if ( loopMax > GraphTraceLen)
 130                 loopMax = GraphTraceLen;
 131
 132         for (uint8_t i = 0; i < loopMax; ++i) {
 133                 if (GraphBuffer[i] > *high)
 134                         *high = GraphBuffer[i];
 135                 else if (GraphBuffer[i] < *low)
 136                         *low = GraphBuffer[i];
 137         }
 138
 139         //12% fuzz in case highs and lows aren't clipped
 140         if (addFuzz) {
 141                 *high = (int)(*high * .88);
 142                 *low  = (int)(*low  * .88);
 143         }
 144 }