mirror of
https://github.com/Proxmark/proxmark3.git
synced 2025-08-21 05:43:23 -07:00
LF Demod bug fixes and add lf em em410xdemod
fixed a few bugs in lf demod that the streamlining added. added new lf em em410xdemod command that loops until button pressed. (similar to lf hid fskdemod
This commit is contained in:
marshmellow42
parent
7db5f1ca25
commit
66707a3b3c
10 changed files with 105 additions and 365 deletions
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@ -657,6 +657,9 @@ void UsbPacketReceived(uint8_t *packet, int len)
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case CMD_IO_CLONE_TAG: // Clone IO tag by ID to T55x7
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CopyIOtoT55x7(c->arg[0], c->arg[1], c->d.asBytes[0]);
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break;
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case CMD_EM410X_DEMOD:
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CmdEM410xdemod(c->arg[0], 0, 0, 1);
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break;
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case CMD_EM410X_WRITE_TAG:
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WriteEM410x(c->arg[0], c->arg[1], c->arg[2]);
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break;
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@ -128,6 +128,7 @@ void AcquireRawBitsTI(void);
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void SimulateTagLowFrequency(int period, int gap, int ledcontrol);
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void CmdHIDsimTAG(int hi, int lo, int ledcontrol);
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void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol);
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void CmdEM410xdemod(int findone, int *high, int *low, int ledcontrol);
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void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol);
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void CopyIOtoT55x7(uint32_t hi, uint32_t lo, uint8_t longFMT); // Clone an ioProx card to T5557/T5567
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void SimulateTagLowFrequencyBidir(int divisor, int max_bitlen);
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359
armsrc/lfops.c
359
armsrc/lfops.c
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@ -630,106 +630,6 @@ void CmdHIDsimTAG(int hi, int lo, int ledcontrol)
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if (ledcontrol)
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LED_A_OFF();
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}
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/*
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//translate wave to 11111100000 (1 for each short wave 0 for each long wave)
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size_t fsk_demod(uint8_t * dest, size_t size)
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{
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uint32_t last_transition = 0;
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uint32_t idx = 1;
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uint32_t maxVal=0;
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// // we don't care about actual value, only if it's more or less than a
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// // threshold essentially we capture zero crossings for later analysis
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// we do care about the actual value as sometimes near the center of the
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// wave we may get static that changes direction of wave for one value
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// if our value is too low it might affect the read. and if our tag or
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// antenna is weak a setting too high might not see anything. [marshmellow]
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if (size<100) return size;
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for(idx=1; idx<100; idx++){
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if(maxVal<dest[idx]) maxVal = dest[idx];
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}
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// set close to the top of the wave threshold with 13% margin for error
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// less likely to get a false transition up there.
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// (but have to be careful not to go too high and miss some short waves)
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uint32_t threshold_value = (uint32_t)(maxVal*.87); idx=1;
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//uint8_t threshold_value = 127;
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// sync to first lo-hi transition, and threshold
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// Need to threshold first sample
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if(dest[0] < threshold_value) dest[0] = 0;
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else dest[0] = 1;
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size_t numBits = 0;
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// count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)
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// or 10 (fc/10) cycles but in practice due to noise etc we may end up with with anywhere
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// between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10
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for(idx = 1; idx < size; idx++) {
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// threshold current value
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if (dest[idx] < threshold_value) dest[idx] = 0;
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else dest[idx] = 1;
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// Check for 0->1 transition
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if (dest[idx-1] < dest[idx]) { // 0 -> 1 transition
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if (idx-last_transition<6){
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//do nothing with extra garbage
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} else if (idx-last_transition < 9) {
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dest[numBits]=1;
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} else {
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dest[numBits]=0;
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}
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last_transition = idx;
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numBits++;
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}
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}
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return numBits; //Actually, it returns the number of bytes, but each byte represents a bit: 1 or 0
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}
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uint32_t myround(float f)
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{
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if (f >= 2000) return 2000;//something bad happened
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return (uint32_t) (f + (float)0.5);
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}
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//translate 11111100000 to 10
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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,
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{
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uint8_t lastval=dest[0];
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uint32_t idx=0;
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size_t numBits=0;
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uint32_t n=1;
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for( idx=1; idx < size; idx++) {
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if (dest[idx]==lastval) {
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n++;
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continue;
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}
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//if lastval was 1, we have a 1->0 crossing
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if ( dest[idx-1]==1 ) {
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n=myround((float)(n+1)/((float)(rfLen)/(float)8));
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//n=(n+1) / h2l_crossing_value;
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} else {// 0->1 crossing
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n=myround((float)(n+1)/((float)(rfLen-2)/(float)10));
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//n=(n+1) / l2h_crossing_value;
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}
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if (n == 0) n = 1;
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if(n < maxConsequtiveBits) //Consecutive
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{
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if(invert==0){ //invert bits
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memset(dest+numBits, dest[idx-1] , n);
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}else{
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memset(dest+numBits, dest[idx-1]^1 , n);
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}
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numBits += n;
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}
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n=0;
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lastval=dest[idx];
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}//end for
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return numBits;
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}
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*/
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// loop to get raw HID waveform then FSK demodulate the TAG ID from it
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void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
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@ -818,20 +718,20 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
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hi2 = hi = lo = 0;
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}
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WDT_HIT();
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//SpinDelay(50);
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}
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DbpString("Stopped");
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if (ledcontrol) LED_A_OFF();
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}
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/*
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// loop to get raw HID waveform then FSK demodulate the TAG ID from it
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void CmdHIDdemodFSK2(int findone, int *high, int *low, int ledcontrol)
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void CmdEM410xdemod(int findone, int *high, int *low, int ledcontrol)
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{
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uint8_t *dest = (uint8_t *)BigBuf;
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size_t size=0,idx=0; //, found=0;
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uint32_t hi2=0, hi=0, lo=0;
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size_t size=0; //, found=0;
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uint32_t bitLen=0;
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int clk=0, invert=0, errCnt=0;
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uint64_t lo=0;
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// Configure to go in 125Khz listen mode
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LFSetupFPGAForADC(95, true);
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@ -842,139 +742,40 @@ void CmdHIDdemodFSK2(int findone, int *high, int *low, int ledcontrol)
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DoAcquisition125k_internal(-1,true);
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size = sizeof(BigBuf);
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if (size < 2000) continue;
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if (size < 2000) continue;
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// FSK demodulator
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size = fsk_demod(dest, size);
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// we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns
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// 1->0 : fc/8 in sets of 6 (RF/50 / 8 = 6.25)
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// 0->1 : fc/10 in sets of 5 (RF/50 / 10= 5)
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// do not invert
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size = aggregate_bits(dest,size, 50,5,0); //6,5,5,0
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//int askmandemod(uint8_t *BinStream,uint32_t *BitLen,int *clk, int *invert);
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bitLen=size;
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//Dbprintf("DEBUG: Buffer got");
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errCnt = askmandemod(dest,&bitLen,&clk,&invert); //HIDdemodFSK(dest,size,&hi2,&hi,&lo);
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//Dbprintf("DEBUG: ASK Got");
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WDT_HIT();
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// final loop, go over previously decoded manchester data and decode into usable tag ID
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// 111000 bit pattern represent start of frame, 01 pattern represents a 1 and 10 represents a 0
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uint8_t frame_marker_mask[] = {1,1,1,0,0,0};
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int numshifts = 0;
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idx = 0;
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//one scan
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uint8_t sameCardCount =0;
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while( idx + sizeof(frame_marker_mask) < size) {
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// search for a start of frame marker
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if (sameCardCount>2) break; //only up to 2 valid sets of data for the same read of looping card data
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if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0)
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{ // frame marker found
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idx+=sizeof(frame_marker_mask);
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while(dest[idx] != dest[idx+1] && idx < size-2)
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{
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// Keep going until next frame marker (or error)
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// Shift in a bit. Start by shifting high registers
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hi2 = (hi2<<1)|(hi>>31);
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hi = (hi<<1)|(lo>>31);
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//Then, shift in a 0 or one into low
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if (dest[idx] && !dest[idx+1]) // 1 0
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lo=(lo<<1)|0;
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else // 0 1
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lo=(lo<<1)|
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1;
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numshifts++;
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idx += 2;
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}
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//Dbprintf("Num shifts: %d ", numshifts);
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// Hopefully, we read a tag and hit upon the next frame marker
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if(idx + sizeof(frame_marker_mask) < size)
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{
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if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0)
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{
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if (hi2 != 0){ //extra large HID tags
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Dbprintf("TAG ID: %x%08x%08x (%d)",
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(unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
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}
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else { //standard HID tags <38 bits
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//Dbprintf("TAG ID: %x%08x (%d)",(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF); //old print cmd
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uint8_t bitlen = 0;
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uint32_t fc = 0;
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uint32_t cardnum = 0;
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if (((hi>>5)&1)==1){//if bit 38 is set then < 37 bit format is used
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uint32_t lo2=0;
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lo2=(((hi & 31) << 12) | (lo>>20)); //get bits 21-37 to check for format len bit
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uint8_t idx3 = 1;
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while(lo2>1){ //find last bit set to 1 (format len bit)
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lo2=lo2>>1;
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idx3++;
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}
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bitlen =idx3+19;
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fc =0;
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cardnum=0;
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if(bitlen==26){
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cardnum = (lo>>1)&0xFFFF;
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fc = (lo>>17)&0xFF;
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}
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if(bitlen==37){
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cardnum = (lo>>1)&0x7FFFF;
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fc = ((hi&0xF)<<12)|(lo>>20);
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}
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if(bitlen==34){
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cardnum = (lo>>1)&0xFFFF;
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fc= ((hi&1)<<15)|(lo>>17);
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}
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if(bitlen==35){
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cardnum = (lo>>1)&0xFFFFF;
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fc = ((hi&1)<<11)|(lo>>21);
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}
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}
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else { //if bit 38 is not set then 37 bit format is used
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bitlen= 37;
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fc =0;
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cardnum=0;
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if(bitlen==37){
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cardnum = (lo>>1)&0x7FFFF;
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fc = ((hi&0xF)<<12)|(lo>>20);
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}
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}
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//Dbprintf("TAG ID: %x%08x (%d)",
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// (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
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Dbprintf("TAG ID: %x%08x (%d) - Format Len: %dbit - FC: %d - Card: %d",
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(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF,
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(unsigned int) bitlen, (unsigned int) fc, (unsigned int) cardnum);
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}
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sameCardCount++;
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if (findone){
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if (ledcontrol) LED_A_OFF();
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return;
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}
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}
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}
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// reset
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hi2 = hi = lo = 0;
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numshifts = 0;
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}else
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{
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idx++;
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if (errCnt>=0){
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lo = Em410xDecode(dest,bitLen);
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//Dbprintf("DEBUG: EM GOT");
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//printEM410x(lo);
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if (lo>0){
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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));
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}
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if (findone){
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if (ledcontrol) LED_A_OFF();
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return;
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}
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} else{
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//Dbprintf("DEBUG: No Tag");
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}
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WDT_HIT();
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}
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lo = 0;
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clk=0;
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invert=0;
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errCnt=0;
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size=0;
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//SpinDelay(50);
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}
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DbpString("Stopped");
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if (ledcontrol) LED_A_OFF();
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}
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*/
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/*
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uint32_t bytebits_to_byte(uint8_t* src, int numbits)
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{
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uint32_t num = 0;
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for(int i = 0 ; i < numbits ; i++)
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{
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num = (num << 1) | (*src);
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src++;
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}
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return num;
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}
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*/
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void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
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{
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@ -982,7 +783,9 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
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size_t size=0;
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int idx=0;
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uint32_t code=0, code2=0;
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uint8_t version=0;
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uint8_t facilitycode=0;
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uint16_t number=0;
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// Configure to go in 125Khz listen mode
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LFSetupFPGAForADC(95, true);
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@ -994,6 +797,7 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
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//make sure buffer has data
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if (size < 2000) continue;
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//fskdemod and get start index
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WDT_HIT();
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idx = IOdemodFSK(dest,size);
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if (idx>0){
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//valid tag found
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@ -1018,9 +822,9 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
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}
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code = bytebits_to_byte(dest+idx,32);
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code2 = bytebits_to_byte(dest+idx+32,32);
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short version = bytebits_to_byte(dest+idx+27,8); //14,4
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uint8_t facilitycode = bytebits_to_byte(dest+idx+19,8) ;
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uint16_t number = (bytebits_to_byte(dest+idx+36,8)<<8)|(bytebits_to_byte(dest+idx+45,8)); //36,9
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version = bytebits_to_byte(dest+idx+27,8); //14,4
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facilitycode = bytebits_to_byte(dest+idx+19,8) ;
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number = (bytebits_to_byte(dest+idx+36,8)<<8)|(bytebits_to_byte(dest+idx+45,8)); //36,9
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Dbprintf("XSF(%02d)%02x:%d (%08x%08x)",version,facilitycode,number,code,code2);
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// if we're only looking for one tag
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@ -1029,95 +833,16 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
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//LED_A_OFF();
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return;
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}
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code=code2=0;
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version=facilitycode=0;
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number=0;
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idx=0;
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}
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WDT_HIT();
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}
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DbpString("Stopped");
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if (ledcontrol) LED_A_OFF();
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}
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/*
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void CmdIOdemodFSK2(int findone, int *high, int *low, int ledcontrol)
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{
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uint8_t *dest = (uint8_t *)BigBuf;
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size_t size=0, idx=0;
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uint32_t code=0, code2=0;
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// Configure to go in 125Khz listen mode
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LFSetupFPGAForADC(95, true);
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while(!BUTTON_PRESS()) {
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WDT_HIT();
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if (ledcontrol) LED_A_ON();
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DoAcquisition125k_internal(-1,true);
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size = sizeof(BigBuf);
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//make sure buffer has data
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if (size < 64) return;
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//test samples are not just noise
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uint8_t testMax=0;
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for(idx=0;idx<64;idx++){
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if (testMax<dest[idx]) testMax=dest[idx];
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}
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idx=0;
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//if not just noise
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if (testMax>170){
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//Dbprintf("testMax: %d",testMax);
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// FSK demodulator
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size = fsk_demod(dest, size);
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// we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns
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// 1->0 : fc/8 in sets of 7 (RF/64 / 8 = 8)
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// 0->1 : fc/10 in sets of 6 (RF/64 / 10 = 6.4)
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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
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WDT_HIT();
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//Index map
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//0 10 20 30 40 50 60
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//| | | | | | |
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//01234567 8 90123456 7 89012345 6 78901234 5 67890123 4 56789012 3 45678901 23
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//-----------------------------------------------------------------------------
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//00000000 0 11110000 1 facility 1 version* 1 code*one 1 code*two 1 ???????? 11
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//
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//XSF(version)facility:codeone+codetwo
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//Handle the data
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uint8_t sameCardCount=0;
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uint8_t mask[] = {0,0,0,0,0,0,0,0,0,1};
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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");
|
||||
if (ledcontrol) LED_A_OFF();
|
||||
}
|
||||
*/
|
||||
|
||||
/*------------------------------
|
||||
* T5555/T5557/T5567 routines
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue