- uint8_t *dest = (uint8_t *)BigBuf;
- int m=0, n=0, i=0, idx=0, lastval=0;
- int found=0;
- uint32_t code=0, code2=0;
- //uint32_t hi2=0, hi=0, lo=0;
-
- FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
-
- // 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)/7; // fc/8 in sets of 7
- } else {
- n=(n+1)/6; // fc/10 in sets of 6
- }
- switch (n) { // stuff appropriate bits in buffer
- case 0:
- case 1: // one bit
- dest[i++]=dest[idx-1]^1;
- //Dbprintf("%d",dest[idx-1]);
- break;
- case 2: // two bits
- dest[i++]=dest[idx-1]^1;
- dest[i++]=dest[idx-1]^1;
- //Dbprintf("%d",dest[idx-1]);
- //Dbprintf("%d",dest[idx-1]);
- break;
- case 3: // 3 bit start of frame markers
- for(int j=0; j<3; j++){
- dest[i++]=dest[idx-1]^1;
- // Dbprintf("%d",dest[idx-1]);
- }
- break;
- case 4:
- for(int j=0; j<4; j++){
- dest[i++]=dest[idx-1]^1;
- // Dbprintf("%d",dest[idx-1]);
- }
- break;
- case 5:
- for(int j=0; j<5; j++){
- dest[i++]=dest[idx-1]^1;
- // Dbprintf("%d",dest[idx-1]);
- }
- break;
- case 6:
- for(int j=0; j<6; j++){
- dest[i++]=dest[idx-1]^1;
- // Dbprintf("%d",dest[idx-1]);
- }
- break;
- case 7:
- for(int j=0; j<7; j++){
- dest[i++]=dest[idx-1]^1;
- // Dbprintf("%d",dest[idx-1]);
- }
- break;
- case 8:
- for(int j=0; j<8; j++){
- dest[i++]=dest[idx-1]^1;
- // Dbprintf("%d",dest[idx-1]);
- }
- break;
- case 9:
- for(int j=0; j<9; j++){
- dest[i++]=dest[idx-1]^1;
- // Dbprintf("%d",dest[idx-1]);
- }
- break;
- case 10:
- for(int j=0; j<10; j++){
- dest[i++]=dest[idx-1]^1;
- // Dbprintf("%d",dest[idx-1]);
- }
- break;
- case 11:
- for(int j=0; j<11; j++){
- dest[i++]=dest[idx-1]^1;
- // Dbprintf("%d",dest[idx-1]);
- }
- break;
- case 12:
- for(int j=0; j<12; j++){
- dest[i++]=dest[idx-1]^1;
- // Dbprintf("%d",dest[idx-1]);
- }
- break;
- default: // this shouldn't happen, don't stuff any bits
- //Dbprintf("%d",dest[idx-1]);
- break;
- }
- n=0;
- lastval=dest[idx];
- }
- }//end for
- /*for(int j=0; j<64;j+=8){
- Dbprintf("%d%d%d%d%d%d%d%d",dest[j],dest[j+1],dest[j+2],dest[j+3],dest[j+4],dest[j+5],dest[j+6],dest[j+7]);
- }
- Dbprintf("\n");*/
- m=i;
- WDT_HIT();
-
- for( idx=0; idx<m-9; idx++) {
- if ( !(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])&& (dest[idx+9])){
- found=1;
- //idx+=9;
- if (found) {
- 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]);
-
- short version='\x00';
- char unknown='\x00';
- uint16_t number=0;
- for(int j=14;j<18;j++){
- //Dbprintf("%d",dest[idx+j]);
- version <<=1;
- if (dest[idx+j]) version |= 1;
- }
- for(int j=19;j<27;j++){
- //Dbprintf("%d",dest[idx+j]);
- unknown <<=1;
- if (dest[idx+j]) unknown |= 1;
- }
- for(int j=36;j<45;j++){
- //Dbprintf("%d",dest[idx+j]);
- number <<=1;
- if (dest[idx+j]) number |= 1;
- }
- for(int j=46;j<53;j++){
- //Dbprintf("%d",dest[idx+j]);
- number <<=1;
- if (dest[idx+j]) number |= 1;
- }
- for(int j=0; j<32; j++){
- code <<=1;
- if(dest[idx+j]) code |= 1;
- }
- for(int j=32; j<64; j++){
- code2 <<=1;
- if(dest[idx+j]) code2 |= 1;
- }
-
- Dbprintf("XSF(%02d)%02x:%d (%08x%08x)",version,unknown,number,code,code2);
- if (ledcontrol)
- LED_D_OFF();
- }
- // if we're only looking for one tag
- if (findone){
- //*high = hi;
- //*low = lo;
- LED_A_OFF();
- return;
- }
-
- //hi=0;
- //lo=0;
- found=0;
- }
-
- }
- }
- WDT_HIT();
+ 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