X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/7496d8d822a4a3855e6ab6d1d4cb3fb947517beb..4118b74dc8834bd2f45002ca6b781ce7cfae6d0c:/armsrc/lfops.c

diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index 95a9fcf6..79d59bf9 100644
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -14,6 +14,7 @@
 #include "hitag2.h"
 #include "crc16.h"
 #include "string.h"
+#include "lfdemod.h"
 
 
 /**
@@ -630,87 +631,12 @@ void CmdHIDsimTAG(int hi, int lo, int ledcontrol)
 		LED_A_OFF();
 }
 
-size_t fsk_demod(uint8_t * dest, size_t size)
-{
-	uint32_t last_transition = 0;
-	uint32_t idx = 1;
-	// 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;
-	
-	// sync to first lo-hi transition, and threshold
-
-	//Need to threshold first sample
-	if(dest[0] < threshold_value) dest[0] = 0;
-	else dest[0] = 1;
-
-	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;
-
-		// Check for 0->1 transition
-		if (dest[idx-1] < dest[idx]) { // 0 -> 1 transition
-
-			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
-}
-
-
-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 invert )
-{
-	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]==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) //Consecutive 
-		{
-			if(invert==0){ //invert bits 
-				memset(dest+numBits, dest[idx-1] , n);
-			}else{
-				memset(dest+numBits, dest[idx-1]^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
+// loop to get 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;
+	size_t size=0; //, found=0;
 	uint32_t hi2=0, hi=0, lo=0;
 
 	// Configure to go in 125Khz listen mode
@@ -723,139 +649,143 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
 
 		DoAcquisition125k_internal(-1,true);
 		size  = sizeof(BigBuf);
-
+    if (size < 2000) continue; 
 		// FSK demodulator
-		size = fsk_demod(dest, size);
-
-		// we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns
-		// 1->0 : fc/8 in sets of 6  (RF/50 / 8 = 6.25)
-		// 0->1 : fc/10 in sets of 5 (RF/50 / 10= 5)
-		// do not invert
-		size = aggregate_bits(dest,size, 6,5,5,0); 
 
+		int bitLen = HIDdemodFSK(dest,size,&hi2,&hi,&lo);
+		
 		WDT_HIT();
 
+		if (bitLen>0 && lo>0){
 		// final loop, go over previously decoded manchester data and decode into usable tag ID
 		// 111000 bit pattern represent start of frame, 01 pattern represents a 1 and 10 represents a 0
-		uint8_t frame_marker_mask[] = {1,1,1,0,0,0};
-		int numshifts = 0;
-		idx = 0;
-		while( idx + sizeof(frame_marker_mask) < size) {
-			// search for a start of frame marker
-			if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0)
-			{ // frame marker found
-				idx+=sizeof(frame_marker_mask);
-				while(dest[idx] != dest[idx+1] && idx < size-2)
-				{	
-					// Keep going until next frame marker (or error)
-					// Shift in a bit. Start by shifting high registers
-					hi2 = (hi2<<1)|(hi>>31);
-					hi = (hi<<1)|(lo>>31);
-					//Then, shift in a 0 or one into low
-					if (dest[idx] && !dest[idx+1])	// 1 0
-						lo=(lo<<1)|0;
-					else // 0 1
-						lo=(lo<<1)|
-								1;
-					numshifts++;
-					idx += 2;
+			if (hi2 != 0){ //extra large HID tags
+				Dbprintf("TAG ID: %x%08x%08x (%d)",
+					 (unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
+			}else {  //standard HID tags <38 bits
+				//Dbprintf("TAG ID: %x%08x (%d)",(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF); //old print cmd
+				uint8_t bitlen = 0;
+				uint32_t fc = 0;
+				uint32_t cardnum = 0;
+				if (((hi>>5)&1)==1){//if bit 38 is set then < 37 bit format is used
+					uint32_t lo2=0;
+					lo2=(((hi & 31) << 12) | (lo>>20)); //get bits 21-37 to check for format len bit
+					uint8_t idx3 = 1;
+					while(lo2>1){ //find last bit set to 1 (format len bit)
+						lo2=lo2>>1;
+						idx3++;
+					}
+					bitlen =idx3+19;  
+					fc =0;
+					cardnum=0;
+					if(bitlen==26){
+						cardnum = (lo>>1)&0xFFFF;
+						fc = (lo>>17)&0xFF;
+					}
+					if(bitlen==37){
+						cardnum = (lo>>1)&0x7FFFF;
+						fc = ((hi&0xF)<<12)|(lo>>20);
+					}
+					if(bitlen==34){
+						cardnum = (lo>>1)&0xFFFF;
+						fc= ((hi&1)<<15)|(lo>>17);
+					}
+					if(bitlen==35){
+						cardnum = (lo>>1)&0xFFFFF;
+						fc = ((hi&1)<<11)|(lo>>21);
+					}
 				}
-				//Dbprintf("Num shifts: %d ", numshifts);
-				// Hopefully, we read a tag and	 hit upon the next frame marker
-				if(idx + sizeof(frame_marker_mask) < size)
-				{
-					if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0)
-					{
-						if (hi2 != 0){ //extra large HID tags
-							Dbprintf("TAG ID: %x%08x%08x (%d)",
-								 (unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
-						}
-						else {  //standard HID tags <38 bits
-							//Dbprintf("TAG ID: %x%08x (%d)",(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF); //old print cmd
-							uint8_t bitlen = 0;
-							uint32_t fc = 0;
-							uint32_t cardnum = 0;
-							if (((hi>>5)&1)==1){//if bit 38 is set then < 37 bit format is used
-								uint32_t lo2=0;
-								lo2=(((hi & 31) << 12) | (lo>>20)); //get bits 21-37 to check for format len bit
-								uint8_t idx3 = 1;
-								while(lo2>1){ //find last bit set to 1 (format len bit)
-									lo2=lo2>>1;
-									idx3++;
-								}
-								bitlen =idx3+19;  
-								fc =0;
-								cardnum=0;
-								if(bitlen==26){
-									cardnum = (lo>>1)&0xFFFF;
-									fc = (lo>>17)&0xFF;
-								}
-								if(bitlen==37){
-									cardnum = (lo>>1)&0x7FFFF;
-									fc = ((hi&0xF)<<12)|(lo>>20);
-								}
-								if(bitlen==34){
-									cardnum = (lo>>1)&0xFFFF;
-									fc= ((hi&1)<<15)|(lo>>17);
-								}
-								if(bitlen==35){
-									cardnum = (lo>>1)&0xFFFFF;
-									fc = ((hi&1)<<11)|(lo>>21);
-								}
-							}
-							else { //if bit 38 is not set then 37 bit format is used
-								bitlen= 37;
-								fc =0;
-								cardnum=0;
-								if(bitlen==37){
-									cardnum = (lo>>1)&0x7FFFF;
-									fc = ((hi&0xF)<<12)|(lo>>20);
-								}
-							}
-									//Dbprintf("TAG ID: %x%08x (%d)",
-							// (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);				
-							Dbprintf("TAG ID: %x%08x (%d) - Format Len: %dbit - FC: %d - Card: %d",
-								(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF,
-								(unsigned int) bitlen, (unsigned int) fc, (unsigned int) cardnum);
-						}
-						if (findone){
-							if (ledcontrol)	LED_A_OFF();
-							return;
-						}
+				else { //if bit 38 is not set then 37 bit format is used
+					bitlen= 37;
+					fc =0;
+					cardnum=0;
+					if(bitlen==37){
+						cardnum = (lo>>1)&0x7FFFF;
+						fc = ((hi&0xF)<<12)|(lo>>20);
 					}
 				}
-				// reset
-				hi2 = hi = lo = 0;
-				numshifts = 0;
-			}else
-			{
-				idx++;
+						//Dbprintf("TAG ID: %x%08x (%d)",
+				// (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);				
+				Dbprintf("TAG ID: %x%08x (%d) - Format Len: %dbit - FC: %d - Card: %d",
+					(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF,
+					(unsigned int) bitlen, (unsigned int) fc, (unsigned int) cardnum);
+			}
+			if (findone){
+				if (ledcontrol)	LED_A_OFF();
+				return;
 			}
+			// reset
+			hi2 = hi = lo = 0;
 		}
 		WDT_HIT();
-
-	}
+		//SpinDelay(50);
+	}	
 	DbpString("Stopped");
 	if (ledcontrol) LED_A_OFF();
 }
 
-uint32_t bytebits_to_byte(uint8_t* src, int numbits)
+void CmdEM410xdemod(int findone, int *high, int *low, int ledcontrol)
 {
-	uint32_t num = 0;
-	for(int i = 0 ; i < numbits ; i++)
-	{
-		num = (num << 1) | (*src);
-		src++;
-	}
-	return num;
+	uint8_t *dest = (uint8_t *)BigBuf;
+
+	size_t size=0; //, found=0;
+	int bitLen=0;
+	int clk=0, invert=0, errCnt=0;
+	uint64_t lo=0;
+	// Configure to go in 125Khz listen mode
+	LFSetupFPGAForADC(95, true);
+
+	while(!BUTTON_PRESS()) {
+
+		WDT_HIT();
+		if (ledcontrol) LED_A_ON();
+
+		DoAcquisition125k_internal(-1,true);
+		size  = sizeof(BigBuf);
+    if (size < 2000) continue; 
+		// FSK demodulator
+     //int askmandemod(uint8_t *BinStream,uint32_t *BitLen,int *clk, int *invert);
+    bitLen=size;
+    //Dbprintf("DEBUG: Buffer got");
+    errCnt = askmandemod(dest,&bitLen,&clk,&invert); //HIDdemodFSK(dest,size,&hi2,&hi,&lo);
+		//Dbprintf("DEBUG: ASK Got");
+		WDT_HIT();
+
+		if (errCnt>=0){
+			lo = Em410xDecode(dest,bitLen);
+			//Dbprintf("DEBUG: EM GOT");
+  		//printEM410x(lo);
+  		if (lo>0){
+    		Dbprintf("EM TAG ID: %02x%08x - (%05d_%03d_%08d)",(uint32_t)(lo>>32),(uint32_t)lo,(uint32_t)(lo&0xFFFF),(uint32_t)((lo>>16LL) & 0xFF),(uint32_t)(lo & 0xFFFFFF));
+    	}
+			if (findone){
+				if (ledcontrol)	LED_A_OFF();
+				return;
+			}
+		} else{
+			//Dbprintf("DEBUG: No Tag");
+		}
+		WDT_HIT();
+		lo = 0;
+		clk=0;
+    invert=0;
+		errCnt=0;
+		size=0;
+		//SpinDelay(50);
+	}	
+	DbpString("Stopped");
+	if (ledcontrol) LED_A_OFF();
 }
 
 void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
 {
 	uint8_t *dest = (uint8_t *)BigBuf;
-	size_t size=0, idx=0;
+	size_t size=0;
+	int idx=0;
 	uint32_t code=0, code2=0;
-
+  uint8_t version=0;
+  uint8_t facilitycode=0;
+  uint16_t number=0;
 	// Configure to go in 125Khz listen mode
 	LFSetupFPGAForADC(95, true);
 	
@@ -864,51 +794,50 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
 		if (ledcontrol) LED_A_ON();
 		DoAcquisition125k_internal(-1,true);
 		size  = sizeof(BigBuf);
-
-		// FSK demodulator
-		size = fsk_demod(dest, size);
-		// we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns
-		// 1->0 : fc/8 in sets of 7  (RF/64 / 8 = 8)
-		// 0->1 : fc/10 in sets of 6 (RF/64 / 10 = 6.4)
-		size = aggregate_bits(dest, size, 7,6,13,1);  //13 max Consecutive should be ok as most 0s in row should be 10 for init seq - invert bits
+		//make sure buffer has data
+		if (size < 2000) continue;
+		//fskdemod and get start index
 		WDT_HIT();
-		//Index map
-		//0           10          20          30          40          50          60
-		//|           |           |           |           |           |           |
-		//01234567 8 90123456 7 89012345 6 78901234 5 67890123 4 56789012 3 45678901 23
-		//-----------------------------------------------------------------------------
-		//00000000 0 11110000 1 facility 1 version* 1 code*one 1 code*two 1 ???????? 11
-		//
-		//XSF(version)facility:codeone+codetwo
-		//Handle the data
- 	    uint8_t mask[] = {0,0,0,0,0,0,0,0,0,1};
-		for( idx=0; idx < (size - 64); idx++) {
- 	    	if ( memcmp(dest + idx, mask, sizeof(mask))==0) {
- 	    		//frame marker found
-                if(findone){ //only print binary if we are doing one
-		 	    	Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx],   dest[idx+1],   dest[idx+2],dest[idx+3],dest[idx+4],dest[idx+5],dest[idx+6],dest[idx+7],dest[idx+8]);
-				    Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+9], dest[idx+10],dest[idx+11],dest[idx+12],dest[idx+13],dest[idx+14],dest[idx+15],dest[idx+16],dest[idx+17]);			  
-				    Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+18],dest[idx+19],dest[idx+20],dest[idx+21],dest[idx+22],dest[idx+23],dest[idx+24],dest[idx+25],dest[idx+26]);
-				    Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+27],dest[idx+28],dest[idx+29],dest[idx+30],dest[idx+31],dest[idx+32],dest[idx+33],dest[idx+34],dest[idx+35]);
-				    Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+36],dest[idx+37],dest[idx+38],dest[idx+39],dest[idx+40],dest[idx+41],dest[idx+42],dest[idx+43],dest[idx+44]);
-				    Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+45],dest[idx+46],dest[idx+47],dest[idx+48],dest[idx+49],dest[idx+50],dest[idx+51],dest[idx+52],dest[idx+53]);
-				    Dbprintf("%d%d%d%d%d%d%d%d %d%d",dest[idx+54],dest[idx+55],dest[idx+56],dest[idx+57],dest[idx+58],dest[idx+59],dest[idx+60],dest[idx+61],dest[idx+62],dest[idx+63]);
-				}
-				code = bytebits_to_byte(dest+idx,32);
-			    code2 = bytebits_to_byte(dest+idx+32,32); 
-			    short version = bytebits_to_byte(dest+idx+28,8); //14,4
-			    char facilitycode = bytebits_to_byte(dest+idx+19,8) ;
-			    uint16_t number = (bytebits_to_byte(dest+idx+37,8)<<8)|(bytebits_to_byte(dest+idx+46,8)); //36,9
-			    
-			    Dbprintf("XSF(%02d)%02x:%d (%08x%08x)",version,facilitycode,number,code,code2);			
-				// if we're only looking for one tag 
-				if (findone){
-					if (ledcontrol)	LED_A_OFF();
-					//LED_A_OFF();
-					return;
-				}
-			}		
-		}
+		idx = IOdemodFSK(dest,size);
+		if (idx>0){
+			//valid tag found
+
+			//Index map
+			//0           10          20          30          40          50          60
+			//|           |           |           |           |           |           |
+			//01234567 8 90123456 7 89012345 6 78901234 5 67890123 4 56789012 3 45678901 23
+			//-----------------------------------------------------------------------------
+			//00000000 0 11110000 1 facility 1 version* 1 code*one 1 code*two 1 ???????? 11
+			//
+			//XSF(version)facility:codeone+codetwo
+			//Handle the data
+      if(findone){ //only print binary if we are doing one
+ 	    	Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx],   dest[idx+1],   dest[idx+2],dest[idx+3],dest[idx+4],dest[idx+5],dest[idx+6],dest[idx+7],dest[idx+8]);
+		    Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+9], dest[idx+10],dest[idx+11],dest[idx+12],dest[idx+13],dest[idx+14],dest[idx+15],dest[idx+16],dest[idx+17]);			  
+		    Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+18],dest[idx+19],dest[idx+20],dest[idx+21],dest[idx+22],dest[idx+23],dest[idx+24],dest[idx+25],dest[idx+26]);
+		    Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+27],dest[idx+28],dest[idx+29],dest[idx+30],dest[idx+31],dest[idx+32],dest[idx+33],dest[idx+34],dest[idx+35]);
+		    Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+36],dest[idx+37],dest[idx+38],dest[idx+39],dest[idx+40],dest[idx+41],dest[idx+42],dest[idx+43],dest[idx+44]);
+		    Dbprintf("%d%d%d%d%d%d%d%d %d",dest[idx+45],dest[idx+46],dest[idx+47],dest[idx+48],dest[idx+49],dest[idx+50],dest[idx+51],dest[idx+52],dest[idx+53]);
+		    Dbprintf("%d%d%d%d%d%d%d%d %d%d",dest[idx+54],dest[idx+55],dest[idx+56],dest[idx+57],dest[idx+58],dest[idx+59],dest[idx+60],dest[idx+61],dest[idx+62],dest[idx+63]);
+			}
+			code = bytebits_to_byte(dest+idx,32);
+	    code2 = bytebits_to_byte(dest+idx+32,32); 
+	    version = bytebits_to_byte(dest+idx+27,8); //14,4
+	    facilitycode = bytebits_to_byte(dest+idx+18,8) ;
+	    number = (bytebits_to_byte(dest+idx+36,8)<<8)|(bytebits_to_byte(dest+idx+45,8)); //36,9
+	    
+	    Dbprintf("XSF(%02d)%02x:%05d (%08x%08x)",version,facilitycode,number,code,code2);			
+			// if we're only looking for one tag 
+			if (findone){
+				if (ledcontrol)	LED_A_OFF();
+				//LED_A_OFF();
+				return;
+			}
+			code=code2=0;
+			version=facilitycode=0;
+			number=0;
+			idx=0;
+		}	
 		WDT_HIT();
 	}
 	DbpString("Stopped");