#include <string.h>
#include "ui.h"
#include "graph.h"
+#include "lfdemod.h"
int GraphBuffer[MAX_GRAPH_TRACE_LEN];
int GraphTraceLen;
return gtl;
}
-/*
- * Detect clock rate
- */
- //decommissioned - has difficulty detecting rf/32 and only works if data is manchester encoded
-/*
-int DetectClock2(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;
- }
- }
+ if ( buff == NULL ) return;
- return clock;
-}
-*/
-
-// by marshmellow
-// not perfect especially with lower clocks or VERY good antennas (heavy wave clipping)
-// maybe somehow adjust peak trimming value based on samples to fix?
-int DetectClock(int peak)
- {
- int i=0;
- int low=0;
- int clk[]={16,32,40,50,64,100,128,256};
- if (!peak){
- for (i=0;i<GraphTraceLen;++i){
- if(GraphBuffer[i]>peak){
- peak = GraphBuffer[i];
- }
- if(GraphBuffer[i]<low){
- low = GraphBuffer[i];
- }
- }
- peak=(int)(peak*.75);
- low= (int)(low*.75);
- }
- //int numbits;
- int ii;
- int loopCnt = 256;
- if (GraphTraceLen<loopCnt) loopCnt = GraphTraceLen;
- int clkCnt;
- int tol = 0;
- int bestErr=1000;
- int errCnt[]={0,0,0,0,0,0,0,0};
- // int good;
- for(clkCnt=0; clkCnt<6;++clkCnt){
- if (clk[clkCnt]==32){
- tol=1;
- }else{
- tol=0;
- }
- bestErr=1000;
- for (ii=0; ii<loopCnt; ++ii){
- if ((GraphBuffer[ii]>=peak) || (GraphBuffer[ii]<=low)){
- //numbits=0;
- //good=1;
- errCnt[clkCnt]=0;
- for (i=0; i<((int)(GraphTraceLen/clk[clkCnt])-1); ++i){
- if (GraphBuffer[ii+(i*clk[clkCnt])]>=peak || GraphBuffer[ii+(i*clk[clkCnt])]<=low){
- //numbits++;
- }else if(GraphBuffer[ii+(i*clk[clkCnt])-tol]>=peak || GraphBuffer[ii+(i*clk[clkCnt])-tol]<=low){
- }else if(GraphBuffer[ii+(i*clk[clkCnt])+tol]>=peak || GraphBuffer[ii+(i*clk[clkCnt])+tol]<=low){
- }else{ //error no peak detected
- //numbits=0;
- //good=0;
- errCnt[clkCnt]++;
- //break;
- }
- }
- if(errCnt[clkCnt]==0) return clk[clkCnt];
- if(errCnt[clkCnt]<bestErr) bestErr=errCnt[clkCnt];
- }
- }
- errCnt[clkCnt]=bestErr;
- }
- int iii=0;
- int best=0;
- for (iii=0; iii<6;++iii){
- if (errCnt[iii]<errCnt[best]){
- best = iii;
- }
- }
- PrintAndLog("clkCnt: %d, ii: %d, i: %d peak: %d, low: %d, errcnt: %d, errCnt64: %d",clkCnt,ii,i,peak,low,errCnt[best],errCnt[4]);
- return clk[best];
+ 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);
- //clock2 = DetectClock2(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) {
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);
+ }
}
\ No newline at end of file
projects / proxmark3-svn / blobdiff