//-----------------------------------------------------------------------------
#include <stdio.h>
+#include <stdbool.h>
#include <string.h>
#include "ui.h"
#include "graph.h"
+#include "lfdemod.h"
int GraphBuffer[MAX_GRAPH_TRACE_LEN];
int GraphTraceLen;
-
-/* write a bit to the graph */
+/* write a manchester bit to the graph */
void AppendGraph(int redraw, int clock, int bit)
{
int i;
-
+ //set first half the clock bit (all 1's or 0's for a 0 or 1 bit)
for (i = 0; i < (int)(clock / 2); ++i)
- GraphBuffer[GraphTraceLen++] = bit ^ 1;
-
+ GraphBuffer[GraphTraceLen++] = bit ;
+ //set second half of the clock bit (all 0's or 1's for a 0 or 1 bit)
for (i = (int)(clock / 2); i < clock; ++i)
- GraphBuffer[GraphTraceLen++] = bit;
+ GraphBuffer[GraphTraceLen++] = bit ^ 1;
if (redraw)
RepaintGraphWindow();
}
-/* clear out our graph window */
+// clear out our graph window
int ClearGraph(int redraw)
{
int gtl = GraphTraceLen;
+ memset(GraphBuffer, 0x00, GraphTraceLen);
+
GraphTraceLen = 0;
if (redraw)
return gtl;
}
+// option '1' to save GraphBuffer any other to restore
+void save_restoreGB(uint8_t saveOpt)
+{
+ static int SavedGB[MAX_GRAPH_TRACE_LEN];
+ static int SavedGBlen;
+ static bool GB_Saved = false;
+
+ if (saveOpt==1) { //save
+ memcpy(SavedGB, GraphBuffer, sizeof(GraphBuffer));
+ SavedGBlen = GraphTraceLen;
+ GB_Saved=true;
+ } else if (GB_Saved){ //restore
+ memcpy(GraphBuffer, SavedGB, sizeof(GraphBuffer));
+ GraphTraceLen = SavedGBlen;
+ RepaintGraphWindow();
+ }
+ return;
+}
-/*
- * Detect clock rate
- */
- //decommissioned - has difficulty detecting rf/32 and only works if data is manchester encoded
-/*
-int DetectClock2(int peak)
+// DETECT CLOCK NOW IN LFDEMOD.C
+
+void setGraphBuf(uint8_t *buff, size_t 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];
-
- // peak=(int)(peak*.75);
- 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]-128;
+ }
+ GraphTraceLen=size;
+ RepaintGraphWindow();
+ return;
+}
+size_t getFromGraphBuf(uint8_t *buff)
+{
+ if (buff == NULL ) return 0;
+ uint32_t i;
+ for (i=0;i<GraphTraceLen;++i){
+ if (GraphBuffer[i]>127) GraphBuffer[i]=127; //trim
+ if (GraphBuffer[i]<-127) GraphBuffer[i]=-127; //trim
+ buff[i]=(uint8_t)(GraphBuffer[i]+128);
+ }
+ return i;
+}
+
+// A simple test to see if there is any data inside Graphbuffer.
+bool HasGraphData(){
+
+ if ( GraphTraceLen <= 0) {
+ PrintAndLog("No data available, try reading something first");
+ return false;
+ }
+ return true;
}
-*/
-// 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)
+// 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);
+ }
+}
+
+// Get or auto-detect ask clock rate
+int GetAskClock(const char str[], bool printAns, bool verbose)
{
- 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];
+ int clock;
+ sscanf(str, "%i", &clock);
+ if (!strcmp(str, ""))
+ clock = 0;
+
+ if (clock != 0)
+ return clock;
+ // Auto-detect clock
+ uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
+ size_t size = getFromGraphBuf(grph);
+ if (size == 0) {
+ if (verbose)
+ PrintAndLog("Failed to copy from graphbuffer");
+ return -1;
+ }
+ bool st = DetectST(grph, &size, &clock);
+ int start = 0;
+ if (st == false) {
+ start = DetectASKClock(grph, size, &clock, 20);
+ }
+ // Only print this message if we're not looping something
+ if (printAns){
+ PrintAndLog("Auto-detected clock rate: %d, Best Starting Position: %d", clock, start);
+ }
+ return clock;
}
+uint8_t GetPskCarrier(const char str[], bool printAns, bool verbose)
+{
+ uint8_t carrier=0;
+ uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
+ size_t size = getFromGraphBuf(grph);
+ if ( size == 0 ) {
+ if (verbose)
+ PrintAndLog("Failed to copy from graphbuffer");
+ return 0;
+ }
+ //uint8_t countPSK_FC(uint8_t *BitStream, size_t size)
+
+ carrier = countFC(grph,size,0);
+ // Only print this message if we're not looping something
+ if (printAns){
+ PrintAndLog("Auto-detected PSK carrier rate: %d", carrier);
+ }
+ return carrier;
+}
+
+int GetPskClock(const char str[], bool printAns, bool verbose)
+{
+ int clock;
+ sscanf(str, "%i", &clock);
+ if (!strcmp(str, ""))
+ clock = 0;
+
+ if (clock!=0) return clock;
+ // Auto-detect clock
+ uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
+ size_t size = getFromGraphBuf(grph);
+ if ( size == 0 ) {
+ if (verbose) PrintAndLog("Failed to copy from graphbuffer");
+ return -1;
+ }
+ clock = DetectPSKClock(grph,size,0);
+ // Only print this message if we're not looping something
+ if (printAns) PrintAndLog("Auto-detected clock rate: %d", clock);
+
+ return clock;
+}
+
+uint8_t GetNrzClock(const char str[], bool printAns, bool verbose)
+{
+ int clock;
+ sscanf(str, "%i", &clock);
+ if (!strcmp(str, ""))
+ clock = 0;
-/* Get or auto-detect clock rate */
-int GetClock(const char *str, int peak, int verbose)
+ if (clock!=0)
+ return clock;
+ // Auto-detect clock
+ uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
+ size_t size = getFromGraphBuf(grph);
+ if ( size == 0 ) {
+ if (verbose)
+ PrintAndLog("Failed to copy from graphbuffer");
+ return -1;
+ }
+ clock = DetectNRZClock(grph, size, 0);
+ // Only print this message if we're not looping something
+ if (printAns){
+ PrintAndLog("Auto-detected clock rate: %d", clock);
+ }
+ return clock;
+}
+//by marshmellow
+//attempt to detect the field clock and bit clock for FSK
+uint8_t GetFskClock(const char str[], bool printAns, bool verbose)
+{
+ int clock;
+ sscanf(str, "%i", &clock);
+ if (!strcmp(str, ""))
+ clock = 0;
+ if (clock != 0) return (uint8_t)clock;
+
+
+ uint8_t fc1=0, fc2=0, rf1=0;
+ uint8_t ans = fskClocks(&fc1, &fc2, &rf1, verbose);
+ if (ans == 0) return 0;
+ if ((fc1==10 && fc2==8) || (fc1==8 && fc2==5)){
+ if (printAns) PrintAndLog("Detected Field Clocks: FC/%d, FC/%d - Bit Clock: RF/%d", fc1, fc2, rf1);
+ return rf1;
+ }
+ if (verbose){
+ PrintAndLog("DEBUG: unknown fsk field clock detected");
+ PrintAndLog("Detected Field Clocks: FC/%d, FC/%d - Bit Clock: RF/%d", fc1, fc2, rf1);
+ }
+ return 0;
+}
+uint8_t fskClocks(uint8_t *fc1, uint8_t *fc2, uint8_t *rf1, bool verbose)
{
- int clock;
-// int clock2;
- 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);
- //PrintAndLog("clock2: %d",clock2);
- }
- }
-
- return clock;
+ uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
+ size_t size = getFromGraphBuf(BitStream);
+ if (size==0) return 0;
+ uint16_t ans = countFC(BitStream, size, 1);
+ if (ans==0) {
+ if (verbose || g_debugMode) PrintAndLog("DEBUG: No data found");
+ return 0;
+ }
+ *fc1 = (ans >> 8) & 0xFF;
+ *fc2 = ans & 0xFF;
+
+ *rf1 = detectFSKClk(BitStream, size, *fc1, *fc2);
+ if (*rf1==0) {
+ if (verbose || g_debugMode) PrintAndLog("DEBUG: Clock detect error");
+ return 0;
+ }
+ return 1;
+}
+
+// test samples are not just noise
+bool graphJustNoise(int *BitStream, int size)
+{
+ //might not be high enough for noisy environments
+ #define THRESHOLD 15;
+
+ bool isNoise = TRUE;
+ for(int i=0; i < size && isNoise; i++){
+ isNoise = BitStream[i] < THRESHOLD;
+ }
+ return isNoise;
}
projects / proxmark3-svn / blobdiff