proxmark3/client/graph.c

//-----------------------------------------------------------------------------
// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Graph utilities
//-----------------------------------------------------------------------------

#include <stdio.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 */
void AppendGraph(int redraw, int clock, int bit)
{
	int i;

	for (i = 0; i < (int)(clock / 2); ++i)
		GraphBuffer[GraphTraceLen++] = bit ^ 1;

	for (i = (int)(clock / 2); i < clock; ++i)
		GraphBuffer[GraphTraceLen++] = bit;

	if (redraw)
		RepaintGraphWindow();
}

/* clear out our graph window */
int ClearGraph(int redraw)
{
	int gtl = GraphTraceLen;
	GraphTraceLen = 0;

	if (redraw)
		RepaintGraphWindow();

	return gtl;
}

/*
 * Detect clock rate
 */
 //decommissioned - has difficulty detecting rf/32
/*
int DetectClockOld(int peak)
{
	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;
}
*/
/*
NOW IN LFDEMOD.C

// 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 DetectASKClock(int peak)
{
	int i=0;
	int low=0;
	int clk[]={16,32,40,50,64,100,128,256};
	int loopCnt = 256;
	if (GraphTraceLen<loopCnt) loopCnt = GraphTraceLen;
	if (!peak){
		for (i=0;i<loopCnt;++i){
			if(GraphBuffer[i]>peak){
				peak = GraphBuffer[i];
			}
			if(GraphBuffer[i]<low){
				low = GraphBuffer[i];
			}
		}
		peak=(int)(peak*.75);
		low= (int)(low*.75);
	}
	int ii;
	int clkCnt;
	int tol = 0;
	int bestErr=1000;
	int errCnt[]={0,0,0,0,0,0,0,0};
	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)){
				 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){
					}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
						errCnt[clkCnt]++;
					}
				}
				if(errCnt[clkCnt]==0) return clk[clkCnt];
				if(errCnt[clkCnt]<bestErr) bestErr=errCnt[clkCnt];
			}
		}
	}
	int iii=0;
	int best=0;
	for (iii=0; iii<6;++iii){
		if (errCnt[iii]<errCnt[best]){
			best = iii;
		}
	}
	// PrintAndLog("DEBUG: 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];
}
*/
void setGraphBuf(uint8_t *buff, size_t size)
{
	int i=0;
	ClearGraph(0);
	for (; i < size; ++i){
		GraphBuffer[i]=buff[i]-128;
	}
	GraphTraceLen=size;
	RepaintGraphWindow();
	return;
}
size_t getFromGraphBuf(uint8_t *buff)
{
	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;
}
/* Get or auto-detect clock rate */
int GetClock(const char *str, int peak, int verbose)
{
	int clock;
//  int clock2;
	sscanf(str, "%i", &clock);
	if (!strcmp(str, ""))
		clock = 0;

	/* Auto-detect clock */
	if (!clock)
	{
		uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
		size_t size = getFromGraphBuf(grph);
		clock = DetectASKClock(grph,size,0);
		//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;
}
int GetNRZpskClock(const char *str, int peak, int verbose)
{
 // return GetClock(str,peak,verbose);
	int clock;
	//  int clock2;
	sscanf(str, "%i", &clock);
	if (!strcmp(str, ""))
		clock = 0;

	/* Auto-detect clock */
	if (!clock)
	{
		uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
		size_t size = getFromGraphBuf(grph);
		clock = DetectpskNRZClock(grph,size,0);
		//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;
}
// Get or auto-detect clock rate
/*
int GetNRZpskClock(const char *str, int peak, int verbose)
{
	int clock;
//  int clock2;
	sscanf(str, "%i", &clock);
	if (!strcmp(str, ""))
		clock = 0;

	// Auto-detect clock
	if (!clock)
	{
		uint8_t grph[MAX_GRAPH_TRACE_LEN]={0};
		int size = getFromGraphBuf(grph);
		clock = DetectASKClock(grph,size,0);
		//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;
}
*/