- uint8_t *dest = (uint8_t *)BigBuf;
- int m=0, n=0, i=0, idx=0, found=0, lastval=0;
- uint32_t hi2=0, hi=0, lo=0;
-
- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
-
- // Connect the A/D to the peak-detected low-frequency path.
- SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
-
- // Give it a bit of time for the resonant antenna to settle.
- SpinDelay(50);
-
- // Now set up the SSC to get the ADC samples that are now streaming at us.
- FpgaSetupSsc();
-
- for(;;) {
- WDT_HIT();
- if (ledcontrol)
- LED_A_ON();
- if(BUTTON_PRESS()) {
- DbpString("Stopped");
- if (ledcontrol)
- LED_A_OFF();
- return;
- }
-
- i = 0;
- m = sizeof(BigBuf);
- memset(dest,128,m);
- for(;;) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = 0x43;
- if (ledcontrol)
- LED_D_ON();
- }
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
- // 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
- if(dest[i] < 127) dest[i] = 0; else dest[i] = 1;
- i++;
- if (ledcontrol)
- LED_D_OFF();
- if(i >= m) {
- break;
- }
- }
- }
-
- // FSK demodulator
-
- // sync to first lo-hi transition
- for( idx=1; idx<m; idx++) {
- if (dest[idx-1]<dest[idx])
- lastval=idx;
- break;
- }
- WDT_HIT();
-
- // 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( i=0; idx<m; idx++) {
- if (dest[idx-1]<dest[idx]) {
- dest[i]=idx-lastval;
- if (dest[i] <= 8) {
- dest[i]=1;
- } else {
- dest[i]=0;
- }
-
- lastval=idx;
- i++;
- }
- }
- m=i;
- WDT_HIT();
-
- // we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns
- lastval=dest[0];
- idx=0;
- i=0;
- n=0;
- for( idx=0; idx<m; idx++) {
- if (dest[idx]==lastval) {
- n++;
- } else {
- // a bit time is five fc/10 or six fc/8 cycles so figure out how many bits a pattern width represents,
- // an extra fc/8 pattern preceeds every 4 bits (about 200 cycles) just to complicate things but it gets
- // swallowed up by rounding
- // expected results are 1 or 2 bits, any more and it's an invalid manchester encoding
- // special start of frame markers use invalid manchester states (no transitions) by using sequences
- // like 111000
- if (dest[idx-1]) {
- n=(n+1)/6; // fc/8 in sets of 6
- } else {
- n=(n+1)/5; // fc/10 in sets of 5
- }
- switch (n) { // stuff appropriate bits in buffer
- case 0:
- case 1: // one bit
- dest[i++]=dest[idx-1];
- break;
- case 2: // two bits
- dest[i++]=dest[idx-1];
- dest[i++]=dest[idx-1];
- break;
- case 3: // 3 bit start of frame markers
- dest[i++]=dest[idx-1];
- dest[i++]=dest[idx-1];
- dest[i++]=dest[idx-1];
- break;
- // When a logic 0 is immediately followed by the start of the next transmisson
- // (special pattern) a pattern of 4 bit duration lengths is created.
- case 4:
- dest[i++]=dest[idx-1];
- dest[i++]=dest[idx-1];
- dest[i++]=dest[idx-1];
- dest[i++]=dest[idx-1];
- break;
- default: // this shouldn't happen, don't stuff any bits
- break;
- }
- n=0;
- lastval=dest[idx];
- }
- }
- m=i;
- WDT_HIT();
-
- // 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
- for( idx=0; idx<m-6; idx++) {
- // search for a start of frame marker
- if ( dest[idx] && dest[idx+1] && dest[idx+2] && (!dest[idx+3]) && (!dest[idx+4]) && (!dest[idx+5]) )
- {
- found=1;
- idx+=6;
- if (found && (hi2|hi|lo)) {
- if (hi2 != 0){
- Dbprintf("TAG ID: %x%08x%08x (%d)",
- (unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
- }
- else {
- Dbprintf("TAG ID: %x%08x (%d)",
- (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
- }
- /* if we're only looking for one tag */
- if (findone)
- {
- *high = hi;
- *low = lo;
- return;
- }
- hi2=0;
- hi=0;
- lo=0;
- found=0;
- }
- }
- if (found) {
- if (dest[idx] && (!dest[idx+1]) ) {
- hi2=(hi2<<1)|(hi>>31);
- hi=(hi<<1)|(lo>>31);
- lo=(lo<<1)|0;
- } else if ( (!dest[idx]) && dest[idx+1]) {
- hi2=(hi2<<1)|(hi>>31);
- hi=(hi<<1)|(lo>>31);
- lo=(lo<<1)|1;
- } else {
- found=0;
- hi2=0;
- hi=0;
- lo=0;
- }
- idx++;
- }
- if ( dest[idx] && dest[idx+1] && dest[idx+2] && (!dest[idx+3]) && (!dest[idx+4]) && (!dest[idx+5]) )
- {
- found=1;
- idx+=6;
- if (found && (hi|lo)) {
- if (hi2 != 0){
- Dbprintf("TAG ID: %x%08x%08x (%d)",
- (unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
- }
- else {
- Dbprintf("TAG ID: %x%08x (%d)",
- (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);
- }
- /* if we're only looking for one tag */
- if (findone)
- {
- *high = hi;
- *low = lo;
- return;
- }
- hi2=0;
- hi=0;
- lo=0;
- found=0;
- }
- }
- }
- WDT_HIT();
- }
+ uint8_t *dest = (uint8_t *)BigBuf;
+
+ 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()) {
+
+ WDT_HIT();
+ if (ledcontrol) LED_A_ON();
+
+ DoAcquisition125k_internal(-1,true);
+ // FSK demodulator
+ size = HIDdemodFSK(dest, sizeof(BigBuf), &hi2, &hi, &lo);
+
+ WDT_HIT();
+
+ if (size>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
+ 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;
+ }
+ // reset
+ hi2 = hi = lo = 0;
+ }
+ WDT_HIT();
+ }
+ DbpString("Stopped");
+ if (ledcontrol) LED_A_OFF();
+}
+
+void CmdEM410xdemod(int findone, int *high, int *low, int ledcontrol)
+{
+ uint8_t *dest = (uint8_t *)BigBuf;
+
+ size_t size=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);
+ //Dbprintf("DEBUG: Buffer got");
+ //askdemod and manchester decode
+ errCnt = askmandemod(dest, &size, &clk, &invert);
+ //Dbprintf("DEBUG: ASK Got");
+ WDT_HIT();
+
+ if (errCnt>=0){
+ lo = Em410xDecode(dest,size);
+ //Dbprintf("DEBUG: EM GOT");
+ 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;
+ }
+ DbpString("Stopped");
+ if (ledcontrol) LED_A_OFF();
+}
+
+void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)
+{
+ uint8_t *dest = (uint8_t *)BigBuf;
+ 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();
+ if (ledcontrol) LED_A_ON();
+ DoAcquisition125k_internal(-1,true);
+ //fskdemod and get start index
+ WDT_HIT();
+ idx = IOdemodFSK(dest,sizeof(BigBuf));
+ 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");
+ if (ledcontrol) LED_A_OFF();
projects / proxmark3-svn / blobdiff