X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/083ca3de73b2ae8f3842cae24571962a27741601..b3b706693bedcdece33c4b189a993cbe54bd3612:/armsrc/lfops.c diff --git a/armsrc/lfops.c b/armsrc/lfops.c index 95a9fcf6..94d9d1fb 100644 --- a/armsrc/lfops.c +++ b/armsrc/lfops.c @@ -630,17 +630,32 @@ void CmdHIDsimTAG(int hi, int lo, int ledcontrol) LED_A_OFF(); } +//translate wave to 11111100000 (1 for each short wave 0 for each long wave) 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; + uint32_t maxVal=0; + // // 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 + + // we do care about the actual value as sometimes near the center of the + // wave we may get static that changes direction of wave for one value + // if our value is too low it might affect the read. and if our tag or + // antenna is weak a setting too high might not see anything. [marshmellow] + if (size<100) return size; + for(idx=1; idx<100; idx++){ + if(maxVal1 transition if (dest[idx-1] < dest[idx]) { // 0 -> 1 transition - - if (idx-last_transition < 9) { - dest[numBits]=1; + if (idx-last_transition<6){ + //do nothing with extra garbage + } else if (idx-last_transition < 9) { + dest[numBits]=1; } else { - dest[numBits]=0; + dest[numBits]=0; } last_transition = idx; numBits++; @@ -668,8 +684,14 @@ size_t fsk_demod(uint8_t * dest, size_t size) return numBits; //Actually, it returns the number of bytes, but each byte represents a bit: 1 or 0 } +uint32_t myround(float f) +{ + if (f >= 2000) return 2000;//something bad happened + return (uint32_t) (f + (float)0.5); +} -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 ) +//translate 11111100000 to 10 +size_t aggregate_bits(uint8_t *dest,size_t size, uint8_t rfLen, uint8_t maxConsequtiveBits, uint8_t invert )// uint8_t h2l_crossing_value,uint8_t l2h_crossing_value, { uint8_t lastval=dest[0]; uint32_t idx=0; @@ -684,9 +706,11 @@ size_t aggregate_bits(uint8_t *dest,size_t size, uint8_t h2l_crossing_value,uint } //if lastval was 1, we have a 1->0 crossing if ( dest[idx-1]==1 ) { - n=(n+1) / h2l_crossing_value; + n=myround((float)(n+1)/((float)(rfLen)/(float)8)); + //n=(n+1) / h2l_crossing_value; } else {// 0->1 crossing - n=(n+1) / l2h_crossing_value; + n=myround((float)(n+1)/((float)(rfLen-2)/(float)10)); + //n=(n+1) / l2h_crossing_value; } if (n == 0) n = 1; @@ -696,8 +720,7 @@ size_t aggregate_bits(uint8_t *dest,size_t size, uint8_t h2l_crossing_value,uint memset(dest+numBits, dest[idx-1] , n); }else{ memset(dest+numBits, dest[idx-1]^1 , n); - } - + } numBits += n; } n=0; @@ -705,7 +728,7 @@ size_t aggregate_bits(uint8_t *dest,size_t size, uint8_t h2l_crossing_value,uint }//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; @@ -723,7 +746,7 @@ 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); @@ -731,7 +754,7 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol) // 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); + size = aggregate_bits(dest,size, 50,5,0); //6,5,5,0 WDT_HIT(); @@ -740,8 +763,11 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol) uint8_t frame_marker_mask[] = {1,1,1,0,0,0}; int numshifts = 0; idx = 0; + //one scan + uint8_t sameCardCount =0; while( idx + sizeof(frame_marker_mask) < size) { // search for a start of frame marker + if (sameCardCount>2) break; //only up to 2 valid sets of data for the same read of looping card data if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) { // frame marker found idx+=sizeof(frame_marker_mask); @@ -818,6 +844,7 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol) (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF, (unsigned int) bitlen, (unsigned int) fc, (unsigned int) cardnum); } + sameCardCount++; if (findone){ if (ledcontrol) LED_A_OFF(); return; @@ -864,51 +891,68 @@ 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 - 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; - } - } + //make sure buffer has data + if (size < 64) return; + //test samples are not just noise + uint8_t testMax=0; + for(idx=0;idx<64;idx++){ + if (testMax170){ + //Dbprintf("testMax: %d",testMax); + // 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, 64, 13, 1); //13 max Consecutive should be ok as most 0s in row should be 10 for init seq - invert bits + 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 sameCardCount=0; + uint8_t mask[] = {0,0,0,0,0,0,0,0,0,1}; + for( idx=0; idx < (size - 74); idx++) { + if (sameCardCount>2) break; + if ( memcmp(dest + idx, mask, sizeof(mask))==0) { + //frame marker found + if (!dest[idx+8] && dest[idx+17]==1 && dest[idx+26]==1 && dest[idx+35]==1 && dest[idx+44]==1 && dest[idx+53]==1){ + //confirmed proper separator bits 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+27,8); //14,4 + uint8_t facilitycode = bytebits_to_byte(dest+idx+19,8) ; + uint16_t number = (bytebits_to_byte(dest+idx+36,8)<<8)|(bytebits_to_byte(dest+idx+45,8)); //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; + } + sameCardCount++; + } + } + } + } WDT_HIT(); } DbpString("Stopped");