From: Martin Holst Swende <martin@swende.se>
Date: Fri, 24 Oct 2014 18:46:02 +0000 (+0200)
Subject: First try att merging with head
X-Git-Tag: v2.0.0-rc1~87^2~1^2~3
X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/f97d4e2378e04397b3c884d10acb79725dee4e06?hp=--cc

First try att merging with head
---

f97d4e2378e04397b3c884d10acb79725dee4e06
diff --cc armsrc/lfops.c
index 397ea847,6b131c26..d29ec375
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@@ -15,41 -15,9 +15,46 @@@
  #include "crc16.h"
  #include "string.h"
  
 +// split into two routines so we can avoid timing issues after sending commands //
- void DoAcquisition125k_internal(bool silent)
++void DoAcquisition125k_internal(int trigger_threshold,bool silent)
 +{
 +	uint8_t *dest = (uint8_t *)BigBuf;
 +	int n = sizeof(BigBuf);
 +	int i;
 +
 +	memset(dest, 0, n);
 +	i = 0;
 +	for(;;) {
 +		if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
 +			AT91C_BASE_SSC->SSC_THR = 0x43;
 +			LED_D_ON();
 +		}
 +		if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
 +			dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
- 			i++;
 +			LED_D_OFF();
- 			if (i >= n) break;
++			if (trigger_threshold != -1 && dest[i] < trigger_threshold)
++				continue;
++			else
++				trigger_threshold = -1;
++			if (++i >= n) break;
 +		}
 +	}
- 	if( ! silent)
++	if(!silent)
 +	{
 +		Dbprintf("buffer samples: %02x %02x %02x %02x %02x %02x %02x %02x ...",
 +				dest[0], dest[1], dest[2], dest[3], dest[4], dest[5], dest[6], dest[7]);
++		
 +	}
 +}
- 
- void DoAcquisition125k(void)
++void DoAcquisition125k(int trigger_threshold)
 +{
- 	DoAcquisition125k_internal(false);
++	DoAcquisition125k_internal(trigger_threshold, false);
 +}
 +
- void SetupToAcquireRawAdcSamples(int divisor)
++//void SetupToAcquireRawAdcSamples(int divisor)
+ void LFSetupFPGAForADC(int divisor, bool lf_field)
  {
+ 	FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
  	if ( (divisor == 1) || (divisor < 0) || (divisor > 255) )
  		FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz
  	else if (divisor == 0)
@@@ -71,9 -37,42 +74,17 @@@
  
  void AcquireRawAdcSamples125k(int divisor)
  {
- 	SetupToAcquireRawAdcSamples(divisor);
+ 	LFSetupFPGAForADC(divisor, true);
 -	DoAcquisition125k(-1);
 +	// Now call the acquisition routine
- 	DoAcquisition125k_internal(false);
++	DoAcquisition125k_internal(-1,false);
+ }
 -
+ void SnoopLFRawAdcSamples(int divisor, int trigger_threshold)
+ {
+ 	LFSetupFPGAForADC(divisor, false);
 -	DoAcquisition125k(trigger_threshold);
++	DoAcquisition125k(trigger_threshold, false);
+ }
+ 
 -// split into two routines so we can avoid timing issues after sending commands //
 -void DoAcquisition125k(int trigger_threshold)
 -{
 -	uint8_t *dest = (uint8_t *)BigBuf;
 -	int n = sizeof(BigBuf);
 -	int i;
+ 
 -	memset(dest, 0, n);
 -	i = 0;
 -	for(;;) {
 -		if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
 -			AT91C_BASE_SSC->SSC_THR = 0x43;
 -			LED_D_ON();
 -		}
 -		if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
 -			dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
 -			LED_D_OFF();
 -			if (trigger_threshold != -1 && dest[i] < trigger_threshold)
 -				continue;
 -			else
 -				trigger_threshold = -1;
 -			if (++i >= n) break;
 -		}
 -	}
 -	Dbprintf("buffer samples: %02x %02x %02x %02x %02x %02x %02x %02x ...",
 -			dest[0], dest[1], dest[2], dest[3], dest[4], dest[5], dest[6], dest[7]);
  }
  
  void ModThenAcquireRawAdcSamples125k(int delay_off, int period_0, int period_1, uint8_t *command)
@@@ -606,102 -609,88 +621,101 @@@ void CmdHIDsimTAG(int hi, int lo, int l
  		LED_A_OFF();
  }
  
 -
 -// loop to capture raw HID waveform then FSK demodulate the TAG ID from it
 -void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
 +size_t fsk_demod(uint8_t * dest, size_t size)
  {
 -	uint8_t *dest = (uint8_t *)BigBuf;
 -	int m=0, n=0, i=0, idx=0, found=0, lastval=0;
 -  uint32_t hi2=0, hi=0, lo=0;
 +	uint32_t last_transition = 0;
 +	uint32_t idx = 1;
  
 -	FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
 -	FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
 -	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
 +	// we don't care about actual value, only if it's more or less than a
 +	// threshold essentially we capture zero crossings for later analysis
 +	uint8_t threshold_value = 127;
  
- 
 -	// Connect the A/D to the peak-detected low-frequency path.
 -	SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
 +	// sync to first lo-hi transition, and threshold
  
 -	// Give it a bit of time for the resonant antenna to settle.
 -	SpinDelay(50);
 +	//Need to threshold first sample
 +	if(dest[0] < threshold_value) dest[0] = 0;
 +	else dest[0] = 1;
  
 -	// Now set up the SSC to get the ADC samples that are now streaming at us.
 -	FpgaSetupSsc();
 +	size_t numBits = 0;
 +	// count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)
 +	// or 10 (fc/10) cycles but in practice due to noise etc we may end up with with anywhere
 +	// between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10
 +	for(idx = 1; idx < size; idx++) {
 +		// threshold current value
 +		if (dest[idx] < threshold_value) dest[idx] = 0;
 +		else dest[idx] = 1;
  
 -	for(;;) {
 -		WDT_HIT();
 -		if (ledcontrol)
 -			LED_A_ON();
 -		if(BUTTON_PRESS()) {
 -			DbpString("Stopped");
 -			if (ledcontrol)
 -				LED_A_OFF();
 -			return;
 -		}
 +		// Check for 0->1 transition
 +		if (dest[idx-1] < dest[idx]) { // 0 -> 1 transition
  
 -		i = 0;
 -		m = sizeof(BigBuf);
 -		memset(dest,128,m);
 -		for(;;) {
 -			if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
 -				AT91C_BASE_SSC->SSC_THR = 0x43;
 -				if (ledcontrol)
 -					LED_D_ON();
 -			}
 -			if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
 -				dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
 -				// we don't care about actual value, only if it's more or less than a
 -				// threshold essentially we capture zero crossings for later analysis
 -				if(dest[i] < 127) dest[i] = 0; else dest[i] = 1;
 -				i++;
 -				if (ledcontrol)
 -					LED_D_OFF();
 -				if(i >= m) {
 -					break;
 -				}
 +			if (idx-last_transition <  9) {
 +					dest[numBits]=1;
 +			} else {
 +					dest[numBits]=0;
  			}
 +			last_transition = idx;
 +			numBits++;
  		}
 +	}
 +	return numBits; //Actually, it returns the number of bytes, but each byte represents a bit: 1 or 0
 +}
  
 -		// FSK demodulator
  
 -		// sync to first lo-hi transition
 -		for( idx=1; idx<m; idx++) {
 -			if (dest[idx-1]<dest[idx])
 -				lastval=idx;
 -				break;
 +size_t aggregate_bits(uint8_t *dest,size_t size, uint8_t h2l_crossing_value,uint8_t l2h_crossing_value, uint8_t maxConsequtiveBits )
 +{
 +	uint8_t lastval=dest[0];
 +	uint32_t idx=0;
 +	size_t numBits=0;
 +	uint32_t n=1;
 +
 +	for( idx=1; idx < size; idx++) {
 +
 +		if (dest[idx]==lastval) {
 +			n++;
 +			continue;
 +		}
 +		//if lastval was 1, we have a 1->0 crossing
 +		if ( dest[idx-1] ) {
 +			n=(n+1) / h2l_crossing_value;
 +		} else {// 0->1 crossing
 +			n=(n+1) / l2h_crossing_value;
 +		}
 +		if (n == 0) n = 1;
 +
 +		if(n < maxConsequtiveBits)
 +		{
 +			memset(dest+numBits, dest[idx-1] , n);
 +			numBits += n;
  		}
 +		n=0;
 +		lastval=dest[idx];
 +	}//end for
 +
 +	return numBits;
 +
 +}
 +// loop to capture raw HID waveform then FSK demodulate the TAG ID from it
 +void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
 +{
 +	uint8_t *dest = (uint8_t *)BigBuf;
 +
 +	size_t size=0,idx=0; //, found=0;
 +	uint32_t hi2=0, hi=0, lo=0;
 +
 +
 +	while(!BUTTON_PRESS()) {
 +
 +		// Configure to go in 125Khz listen mode
- 		SetupToAcquireRawAdcSamples(0);
++		LFSetupFPGAForADC(0, true)
 +
  		WDT_HIT();
 +		if (ledcontrol) LED_A_ON();
  
 -		// count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)
 -		// or 10 (fc/10) cycles but in practice due to noise etc we may end up with with anywhere
 -		// between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10
 -		for( i=0; idx<m; idx++) {
 -			if (dest[idx-1]<dest[idx]) {
 -				dest[i]=idx-lastval;
 -				if (dest[i] <= 8) {
 -						dest[i]=1;
 -				} else {
 -						dest[i]=0;
 -				}
 +		DoAcquisition125k_internal(true);
 +		size  = sizeof(BigBuf);
  
 -				lastval=idx;
 -				i++;
 -			}
 -		}
 -		m=i;
 +		// FSK demodulator
 +		size = fsk_demod(dest, size);
  		WDT_HIT();
  
  		// we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns
@@@ -780,24 -826,85 +794,24 @@@ uint32_t bytebits_to_byte(uint8_t* src
  void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
  {
  	uint8_t *dest = (uint8_t *)BigBuf;
 -	int m=0, n=0, i=0, idx=0, lastval=0;
 -	int found=0;
 -	uint32_t code=0, code2=0;
 -	//uint32_t hi2=0, hi=0, lo=0;
  
 -	FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
 -	FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
 -	FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
 +	size_t size=0, idx=0;
 +	uint32_t code=0, code2=0;
  
 -	// Connect the A/D to the peak-detected low-frequency path.
 -	SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
  
 -	// Give it a bit of time for the resonant antenna to settle.
 -	SpinDelay(50);
 +	while(!BUTTON_PRESS()) {
  
 -	// Now set up the SSC to get the ADC samples that are now streaming at us.
 -	FpgaSetupSsc();
 +		// Configure to go in 125Khz listen mode
- 		SetupToAcquireRawAdcSamples(0);
++		LFSetupFPGAForADC(0, true);
  
 -	for(;;) {
  		WDT_HIT();
 -		if (ledcontrol)
 -			LED_A_ON();
 -		if(BUTTON_PRESS()) {
 -			DbpString("Stopped");
 -			if (ledcontrol)
 -				LED_A_OFF();
 -			return;
 -		}
 +		if (ledcontrol) LED_A_ON();
  
 -		i = 0;
 -		m = sizeof(BigBuf);
 -		memset(dest,128,m);
 -		for(;;) {
 -			if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
 -				AT91C_BASE_SSC->SSC_THR = 0x43;
 -				if (ledcontrol)
 -					LED_D_ON();
 -			}
 -			if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
 -				dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
 -				// we don't care about actual value, only if it's more or less than a
 -				// threshold essentially we capture zero crossings for later analysis
 -				if(dest[i] < 127) dest[i] = 0; else dest[i] = 1;
 -				i++;
 -				if (ledcontrol)
 -					LED_D_OFF();
 -				if(i >= m) {
 -					break;
 -				}
 -			}
 -		}
 +		DoAcquisition125k_internal(true);
 +		size  = sizeof(BigBuf);
  
  		// FSK demodulator
 -
 -		// sync to first lo-hi transition
 -		for( idx=1; idx<m; idx++) {
 -			if (dest[idx-1]<dest[idx])
 -				lastval=idx;
 -				break;
 -		}
 -		WDT_HIT();
 -
 -		// count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)
 -		// or 10 (fc/10) cycles but in practice due to noise etc we may end up with with anywhere
 -		// between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10
 -		for( i=0; idx<m; idx++) {
 -			if (dest[idx-1]<dest[idx]) {
 -				dest[i]=idx-lastval;
 -				if (dest[i] <= 8) {
 -						dest[i]=1;
 -				} else {
 -						dest[i]=0;
 -				}
 -
 -				lastval=idx;
 -				i++;
 -			}
 -		}
 -		m=i;
 +		size = fsk_demod(dest, size);
  		WDT_HIT();
  
  		// we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns