#include "hitag2.h"
#include "crc16.h"
#include "string.h"
+#include "lfdemod.h"
-// split into two routines so we can avoid timing issues after sending commands //
+
+/**
+* Does the sample acquisition. If threshold is specified, the actual sampling
+* is not commenced until the threshold has been reached.
+* @param trigger_threshold - the threshold
+* @param silent - is true, now outputs are made. If false, dbprints the status
+*/
void DoAcquisition125k_internal(int trigger_threshold,bool silent)
{
uint8_t *dest = (uint8_t *)BigBuf;
}
}
+/**
+* Perform sample aquisition.
+*/
void DoAcquisition125k(int trigger_threshold)
{
DoAcquisition125k_internal(trigger_threshold, false);
}
-//void SetupToAcquireRawAdcSamples(int divisor)
+/**
+* Setup the FPGA to listen for samples. This method downloads the FPGA bitstream
+* if not already loaded, sets divisor and starts up the antenna.
+* @param divisor : 1, 88> 255 or negative ==> 134.8 KHz
+* 0 or 95 ==> 125 KHz
+*
+**/
void LFSetupFPGAForADC(int divisor, bool lf_field)
{
FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
// Now set up the SSC to get the ADC samples that are now streaming at us.
FpgaSetupSsc();
}
-
+/**
+* Initializes the FPGA, and acquires the samples.
+**/
void AcquireRawAdcSamples125k(int divisor)
{
LFSetupFPGAForADC(divisor, true);
// Now call the acquisition routine
DoAcquisition125k_internal(-1,false);
}
+/**
+* Initializes the FPGA for snoop-mode, and acquires the samples.
+**/
+
void SnoopLFRawAdcSamples(int divisor, int trigger_threshold)
{
LFSetupFPGAForADC(divisor, false);
void ModThenAcquireRawAdcSamples125k(int delay_off, int period_0, int period_1, uint8_t *command)
{
- int at134khz;
/* Make sure the tag is reset */
FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
SpinDelay(2500);
+
+ int divisor_used = 95; // 125 KHz
// see if 'h' was specified
+
if (command[strlen((char *) command) - 1] == 'h')
- at134khz = TRUE;
- else
- at134khz = FALSE;
+ divisor_used = 88; // 134.8 KHz
- if (at134khz)
- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz
- else
- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, divisor_used);
FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
-
// Give it a bit of time for the resonant antenna to settle.
SpinDelay(50);
+
// And a little more time for the tag to fully power up
SpinDelay(2000);
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LED_D_OFF();
SpinDelayUs(delay_off);
- if (at134khz)
- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz
- else
- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, divisor_used);
FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LED_D_OFF();
SpinDelayUs(delay_off);
- if (at134khz)
- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz
- else
- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, divisor_used);
FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
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 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
+// 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
+ LFSetupFPGAForADC(95, true);
while(!BUTTON_PRESS()) {
- // Configure to go in 125Khz listen mode
- LFSetupFPGAForADC(0, true);
-
WDT_HIT();
if (ledcontrol) LED_A_ON();
DoAcquisition125k_internal(-1,true);
size = sizeof(BigBuf);
-
+ if (size < 2000) continue;
// 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
- // 1->0 : fc/8 in sets of 6
- // 0->1 : fc/10 in sets of 5
- size = aggregate_bits(dest,size, 6,5,5);
+ 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;
- }
- //Dbprintf("Num shifts: %d ", numshifts);
- // Hopefully, we read a tag and hit upon the next frame marker
- if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0)
- {
- if (hi2 != 0){
- Dbprintf("TAG ID: %x%08x%08x (%d)",
- (unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
+ 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);
}
- else {
- Dbprintf("TAG ID: %x%08x (%d)",
- (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
+ 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);
}
}
-
- // reset
- hi2 = hi = lo = 0;
- numshifts = 0;
- }else
- {
- idx++;
+ 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;
}
+ // 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)
-{
- uint32_t num = 0;
- for(int i = 0 ; i < numbits ; i++)
- {
- num = (num << 1) | (*src);
- src++;
- }
- return num;
-}
-
-
-void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
+void CmdEM410xdemod(int findone, int *high, int *low, int ledcontrol)
{
uint8_t *dest = (uint8_t *)BigBuf;
- size_t size=0, idx=0;
- uint32_t code=0, code2=0;
-
+ 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()) {
- // Configure to go in 125Khz listen mode
- LFSetupFPGAForADC(0, true);
-
WDT_HIT();
if (ledcontrol) LED_A_ON();
DoAcquisition125k_internal(-1,true);
size = sizeof(BigBuf);
-
+ if (size < 2000) continue;
// FSK demodulator
- size = fsk_demod(dest, size);
+ //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();
- // 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
- // 0->1 : fc/10 in sets of 6
- size = aggregate_bits(dest, size, 7,6,13);
+ 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;
+ 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);
+
+ while(!BUTTON_PRESS()) {
WDT_HIT();
-
- //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)) ) continue;
-
- Dbprintf("%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]);
- Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+8], dest[idx+9], dest[idx+10],dest[idx+11],dest[idx+12],dest[idx+13],dest[idx+14],dest[idx+15]);
- Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+16],dest[idx+17],dest[idx+18],dest[idx+19],dest[idx+20],dest[idx+21],dest[idx+22],dest[idx+23]);
- Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+24],dest[idx+25],dest[idx+26],dest[idx+27],dest[idx+28],dest[idx+29],dest[idx+30],dest[idx+31]);
- Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+32],dest[idx+33],dest[idx+34],dest[idx+35],dest[idx+36],dest[idx+37],dest[idx+38],dest[idx+39]);
- Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+40],dest[idx+41],dest[idx+42],dest[idx+43],dest[idx+44],dest[idx+45],dest[idx+46],dest[idx+47]);
- Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+48],dest[idx+49],dest[idx+50],dest[idx+51],dest[idx+52],dest[idx+53],dest[idx+54],dest[idx+55]);
- Dbprintf("%d%d%d%d%d%d%d%d",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+14,4);
- char unknown = bytebits_to_byte(dest+idx+19,8) ;
- uint16_t number = bytebits_to_byte(dest+idx+36,9);
-
- Dbprintf("XSF(%02d)%02x:%d (%08x%08x)",version,unknown,number,code,code2);
- if (ledcontrol) LED_D_OFF();
-
+ if (ledcontrol) LED_A_ON();
+ DoAcquisition125k_internal(-1,true);
+ size = sizeof(BigBuf);
+ //make sure buffer has data
+ if (size < 2000) continue;
+ //fskdemod and get start index
+ WDT_HIT();
+ 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){
- LED_A_OFF();
+ if (ledcontrol) LED_A_OFF();
+ //LED_A_OFF();
return;
- }
- }
+ }
+ code=code2=0;
+ version=facilitycode=0;
+ number=0;
+ idx=0;
+ }
WDT_HIT();
}
DbpString("Stopped");
// Write one card block in page 0, no lock
void T55xxWriteBlock(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t PwdMode)
{
- unsigned int i;
+ //unsigned int i; //enio adjustment 12/10/14
+ uint32_t i;
FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode)
{
uint8_t *dest = (uint8_t *)BigBuf;
- int m=0, i=0;
-
+ //int m=0, i=0; //enio adjustment 12/10/14
+ uint32_t m=0, i=0;
FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
m = sizeof(BigBuf);
// Clear destination buffer before sending the command
for (bitidx = 0; i < GraphTraceLen; i++)
{
- if ( (GraphBuffer[i-1] > GraphBuffer[i] && dir == 1 && GraphBuffer[i] > lmax) || (GraphBuffer[i-1] < GraphBuffer[i] && dir == 0 && GraphBuffer[i] < lmin))
- {
- lc = i - lastval;
- lastval = i;
-
- // Switch depending on lc length:
- // Tolerance is 1/8 of clock rate (arbitrary)
- if (abs(lc-clock/4) < tolerance) {
- // 16T0
- if((i - pmc) == lc) { /* 16T0 was previous one */
- /* It's a PMC ! */
- i += (128+127+16+32+33+16)-1;
- lastval = i;
- pmc = 0;
- block_done = 1;
- }
- else {
- pmc = i;
- }
- } else if (abs(lc-clock/2) < tolerance) {
- // 32TO
- if((i - pmc) == lc) { /* 16T0 was previous one */
- /* It's a PMC ! */
- i += (128+127+16+32+33)-1;
- lastval = i;
- pmc = 0;
- block_done = 1;
- }
- else if(half_switch == 1) {
- BitStream[bitidx++] = 0;
- half_switch = 0;
- }
- else
- half_switch++;
- } else if (abs(lc-clock) < tolerance) {
- // 64TO
- BitStream[bitidx++] = 1;
- } else {
- // Error
- warnings++;
- if (warnings > 10)
- {
- Dbprintf("Error: too many detection errors, aborting.");
- return 0;
- }
- }
-
- if(block_done == 1) {
- if(bitidx == 128) {
- for(j=0; j<16; j++) {
- Blocks[num_blocks][j] = 128*BitStream[j*8+7]+
- 64*BitStream[j*8+6]+
- 32*BitStream[j*8+5]+
- 16*BitStream[j*8+4]+
- 8*BitStream[j*8+3]+
- 4*BitStream[j*8+2]+
- 2*BitStream[j*8+1]+
- BitStream[j*8];
- }
- num_blocks++;
- }
- bitidx = 0;
- block_done = 0;
- half_switch = 0;
- }
- if (GraphBuffer[i-1] > GraphBuffer[i]) dir=0;
- else dir = 1;
- }
- if(bitidx==255)
- bitidx=0;
- warnings = 0;
- if(num_blocks == 4) break;
+ if ( (GraphBuffer[i-1] > GraphBuffer[i] && dir == 1 && GraphBuffer[i] > lmax) || (GraphBuffer[i-1] < GraphBuffer[i] && dir == 0 && GraphBuffer[i] < lmin))
+ {
+ lc = i - lastval;
+ lastval = i;
+
+ // Switch depending on lc length:
+ // Tolerance is 1/8 of clock rate (arbitrary)
+ if (abs(lc-clock/4) < tolerance) {
+ // 16T0
+ if((i - pmc) == lc) { /* 16T0 was previous one */
+ /* It's a PMC ! */
+ i += (128+127+16+32+33+16)-1;
+ lastval = i;
+ pmc = 0;
+ block_done = 1;
+ }
+ else {
+ pmc = i;
+ }
+ } else if (abs(lc-clock/2) < tolerance) {
+ // 32TO
+ if((i - pmc) == lc) { /* 16T0 was previous one */
+ /* It's a PMC ! */
+ i += (128+127+16+32+33)-1;
+ lastval = i;
+ pmc = 0;
+ block_done = 1;
+ }
+ else if(half_switch == 1) {
+ BitStream[bitidx++] = 0;
+ half_switch = 0;
+ }
+ else
+ half_switch++;
+ } else if (abs(lc-clock) < tolerance) {
+ // 64TO
+ BitStream[bitidx++] = 1;
+ } else {
+ // Error
+ warnings++;
+ if (warnings > 10)
+ {
+ Dbprintf("Error: too many detection errors, aborting.");
+ return 0;
+ }
+ }
+
+ if(block_done == 1) {
+ if(bitidx == 128) {
+ for(j=0; j<16; j++) {
+ Blocks[num_blocks][j] = 128*BitStream[j*8+7]+
+ 64*BitStream[j*8+6]+
+ 32*BitStream[j*8+5]+
+ 16*BitStream[j*8+4]+
+ 8*BitStream[j*8+3]+
+ 4*BitStream[j*8+2]+
+ 2*BitStream[j*8+1]+
+ BitStream[j*8];
+ }
+ num_blocks++;
+ }
+ bitidx = 0;
+ block_done = 0;
+ half_switch = 0;
+ }
+ if(i < GraphTraceLen)
+ {
+ if (GraphBuffer[i-1] > GraphBuffer[i]) dir=0;
+ else dir = 1;
+ }
+ }
+ if(bitidx==255)
+ bitidx=0;
+ warnings = 0;
+ if(num_blocks == 4) break;
}
memcpy(outBlocks, Blocks, 16*num_blocks);
return num_blocks;
projects / proxmark3-svn / blobdiff