X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/3bc3598e880b68870cfcc55fbdda443d77395809..1b492a97af74c0cb6c9886bce8b777d6bb50798d:/armsrc/lfops.c?ds=sidebyside diff --git a/armsrc/lfops.c b/armsrc/lfops.c index fa0516c9..5e01e9b0 100644 --- a/armsrc/lfops.c +++ b/armsrc/lfops.c @@ -721,14 +721,28 @@ void CmdHIDsimTAG(int hi, int lo, uint8_t 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(maxVal= 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; @@ -769,10 +789,12 @@ size_t aggregate_bits(uint8_t *dest,size_t size, uint8_t h2l_crossing_value,uint continue; } //if lastval was 1, we have a 1->0 crossing - if ( dest[idx-1] ) { - n=(n+1) / h2l_crossing_value; + if ( dest[idx-1]==1 ) { + 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; @@ -792,7 +814,7 @@ size_t aggregate_bits(uint8_t *dest,size_t size, uint8_t h2l_crossing_value,uint 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 = get_bigbufptr_recvrespbuf(); @@ -817,7 +839,7 @@ 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(); @@ -826,8 +848,11 @@ 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); @@ -905,6 +930,7 @@ 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; @@ -955,14 +981,24 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) DoAcquisition125k_internal(-1,true); size = sizeof(BigBuf); - + //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, 7,6,13,1); //13 max Consecutive should be ok as most 0s in row should be 10 for init seq - invert bits - + 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 //| | | | | | | @@ -972,12 +1008,14 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) // //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 - 64); idx++) { + 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]); @@ -989,9 +1027,9 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) } 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 + 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); @@ -1000,6 +1038,9 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) if (ledcontrol) LED_A_OFF(); isFinish = 1; break; + } + sameCardCount++; + } } } } @@ -1183,7 +1224,7 @@ void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode) dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR; ++i; LED_D_OFF(); - if (i > bufferlength) break; + if (i >= bufferlength) break; } }