chg: syntax sugar

[proxmark3-svn] / armsrc / legicrf.c

diff --git a/armsrc/legicrf.c b/armsrc/legicrf.c
index ff193edb31a0429ba9746dc91343a11fcbb56052..f58cb44267f82cda314c7194628af02173eeabf9 100644 (file)
--- a/armsrc/legicrf.c
+++ b/armsrc/legicrf.c
@@ -69,7 +69,7 @@ static void setup_timer(void) {
 */
 
 // At TIMER_CLOCK3 (MCK/32)
 */
 
 // At TIMER_CLOCK3 (MCK/32)

-// testing calculating in (us) microseconds.
+// testing calculating in ticks. 1.5ticks = 1us 

 #define        RWD_TIME_1 120          // READER_TIME_PAUSE 20us off, 80us on = 100us  80 * 1.5 == 120ticks
 #define RWD_TIME_0 60          // READER_TIME_PAUSE 20us off, 40us on = 60us   40 * 1.5 == 60ticks 
 #define RWD_TIME_PAUSE 30      // 20us == 20 * 1.5 == 30ticks */
 #define        RWD_TIME_1 120          // READER_TIME_PAUSE 20us off, 80us on = 100us  80 * 1.5 == 120ticks
 #define RWD_TIME_0 60          // READER_TIME_PAUSE 20us off, 40us on = 60us   40 * 1.5 == 60ticks 
 #define RWD_TIME_PAUSE 30      // 20us == 20 * 1.5 == 30ticks */


@@ -92,11 +92,7 @@ static void setup_timer(void) {
 # define OPEN_COIL     HIGH(GPIO_SSC_DOUT);
 #endif
 #ifndef LINE_IN
 # define OPEN_COIL     HIGH(GPIO_SSC_DOUT);
 #endif
 #ifndef LINE_IN

-# define LINE_IN \
-       do { \
-       AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; \
-       AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; \
-       } while (0); 
+# define LINE_IN  AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;

 #endif
 // Pause pulse,  off in 20us / 30ticks,
 // ONE / ZERO bit pulse,  
 #endif
 // Pause pulse,  off in 20us / 30ticks,
 // ONE / ZERO bit pulse,  


@@ -184,7 +180,7 @@ void frame_send_tag(uint16_t response, uint8_t bits) {
        AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
 
         /* TAG_FRAME_WAIT -> shift by 2 */
        AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
 
         /* TAG_FRAME_WAIT -> shift by 2 */

-       legic_prng_forward(2);
+       legic_prng_forward(3);

        response ^= legic_prng_get_bits(bits);
 
        /* Wait for the frame start */
        response ^= legic_prng_get_bits(bits);
 
        /* Wait for the frame start */


@@ -205,8 +201,7 @@ void frame_send_tag(uint16_t response, uint8_t bits) {
  */
 void frame_sendAsReader(uint32_t data, uint8_t bits){
 
  */
 void frame_sendAsReader(uint32_t data, uint8_t bits){
 

-       uint32_t starttime = GET_TICKS, send = 0;
-       uint16_t mask = 1;
+       uint32_t starttime = GET_TICKS, send = 0, mask = 1;

        
        // xor lsfr onto data.
        send = data ^ legic_prng_get_bits(bits);
        
        // xor lsfr onto data.
        send = data ^ legic_prng_get_bits(bits);


@@ -222,7 +217,7 @@ void frame_sendAsReader(uint32_t data, uint8_t bits){
        COIL_PULSE(0);
        
        // log
        COIL_PULSE(0);
        
        // log

-       uint8_t cmdbytes[] = {bits,     BYTEx(data, 0), BYTEx(data, 1), BYTEx(send, 0), BYTEx(send, 1)};
+       uint8_t cmdbytes[] = {bits, BYTEx(data,0), BYTEx(data,1), BYTEx(data,2), BYTEx(send,0), BYTEx(send,1), BYTEx(send,2)};

        LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, TRUE);
 }
 
        LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, TRUE);
 }
 


@@ -258,9 +253,6 @@ static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits) {
        
        frame_clean(f);
        
        
        frame_clean(f);
        

-       /* Bitbang the receiver */
-       LINE_IN;
-       

        // calibrate the prng.
        legic_prng_forward(2);
        data = legic_prng_get_bits(bits);
        // calibrate the prng.
        legic_prng_forward(2);
        data = legic_prng_get_bits(bits);


@@ -305,19 +297,18 @@ static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits) {
 // Setup pm3 as a Legic Reader
 static uint32_t setup_phase_reader(uint8_t iv) {
        
 // Setup pm3 as a Legic Reader
 static uint32_t setup_phase_reader(uint8_t iv) {
        

-       // Switch on carrier and let the tag charge for 1ms
+       // Switch on carrier and let the tag charge for 5ms

        HIGH(GPIO_SSC_DOUT);
        HIGH(GPIO_SSC_DOUT);

-       WaitUS(5000);   
+       WaitUS(5000);

        
        ResetTicks();
        
        
        ResetTicks();
        

-       // no keystream yet

        legic_prng_init(0);
        
        // send IV handshake
        frame_sendAsReader(iv, 7);
 
        legic_prng_init(0);
        
        // send IV handshake
        frame_sendAsReader(iv, 7);
 

-       // Now both tag and reader has same IV. Prng can start.
+       // tag and reader has same IV.

        legic_prng_init(iv);
 
        frame_receiveAsReader(&current_frame, 6);
        legic_prng_init(iv);
 
        frame_receiveAsReader(&current_frame, 6);


@@ -341,20 +332,22 @@ static uint32_t setup_phase_reader(uint8_t iv) {
        return current_frame.data;
 }
 
        return current_frame.data;
 }
 

-static void LegicCommonInit(void) {
+void LegicCommonInit(bool clear_mem) {

 
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
        /* Bitbang the transmitter */
 
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
        /* Bitbang the transmitter */

-       LOW(GPIO_SSC_DOUT);
+       SHORT_COIL;

        AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
        AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
        AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
        AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;

-
+       AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
+       

        // reserve a cardmem,  meaning we can use the tracelog function in bigbuff easier.
        cardmem = BigBuf_get_EM_addr();
        // reserve a cardmem,  meaning we can use the tracelog function in bigbuff easier.
        cardmem = BigBuf_get_EM_addr();

-       memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE);
+       if ( clear_mem )
+               memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE);

 
        clear_trace();
        set_tracing(TRUE);
 
        clear_trace();
        set_tracing(TRUE);


@@ -365,7 +358,7 @@ static void LegicCommonInit(void) {
 
 // Switch off carrier, make sure tag is reset
 static void switch_off_tag_rwd(void) {
 
 // Switch off carrier, make sure tag is reset
 static void switch_off_tag_rwd(void) {

-       LOW(GPIO_SSC_DOUT);
+       SHORT_COIL;

        WaitUS(20);
        WDT_HIT();
 }
        WaitUS(20);
        WDT_HIT();
 }


@@ -396,7 +389,7 @@ int legic_read_byte( uint16_t index, uint8_t cmd_sz) {
        calcCrc = legic4Crc(LEGIC_READ, index, byte, cmd_sz);
 
        if( calcCrc != crc ) {
        calcCrc = legic4Crc(LEGIC_READ, index, byte, cmd_sz);
 
        if( calcCrc != crc ) {

-               Dbprintf("!!! crc mismatch: expected %x but got %x !!!",  calcCrc, crc);
+               Dbprintf("!!! crc mismatch: %x != %x !!!",  calcCrc, crc);

                return -1;
        }
 
                return -1;
        }
 


@@ -409,64 +402,66 @@ int legic_read_byte( uint16_t index, uint8_t cmd_sz) {
  * - wait until the tag sends back an ACK ('1' bit unencrypted)
  * - forward the prng based on the timing
  */
  * - wait until the tag sends back an ACK ('1' bit unencrypted)
  * - forward the prng based on the timing
  */

-int legic_write_byte(uint16_t index, uint8_t byte, uint8_t addr_sz) {
-
-       // crc
-       crc_clear(&legic_crc);
-       crc_update(&legic_crc, 0, 1); /* CMD_WRITE */
-       crc_update(&legic_crc, index, addr_sz);
-       crc_update(&legic_crc, byte, 8);
-       uint32_t crc = crc_finish(&legic_crc);
-       uint32_t crc2 = legic4Crc(LEGIC_WRITE, index, byte, addr_sz+1);
-       if ( crc != crc2 ) {
-               Dbprintf("crc is missmatch");
-               return 1;
-       }
+bool legic_write_byte(uint16_t index, uint8_t byte, uint8_t addr_sz) {
+
+       bool isOK = false;
+       int8_t i = 40;
+       uint8_t edges = 0;
+       uint8_t cmd_sz = addr_sz+1+8+4; //crc+data+cmd;
+       uint32_t steps = 0, next_bit_at, start, crc, old_level = 0;
+
+       crc = legic4Crc(LEGIC_WRITE, index, byte, addr_sz+1);
+

        // send write command
        // send write command

-       uint32_t cmd = ((crc     <<(addr_sz+1+8)) //CRC
-                   |(byte    <<(addr_sz+1))   //Data
-                   |(index    <<1)             //index
-                   | LEGIC_WRITE);            //CMD = Write
-                                  
-    uint32_t cmd_sz = addr_sz+1+8+4;          //crc+data+cmd
-
-    legic_prng_forward(2);
+       uint32_t cmd = LEGIC_WRITE;
+       cmd |= index << 1;                        // index
+       cmd |= byte  << (addr_sz+1);  // Data   
+       cmd     |= (crc & 0xF ) << (addr_sz+1+8);       // CRC

        
        

-       WaitTicks(330);
+       WaitTicks(240);

        
        frame_sendAsReader(cmd, cmd_sz);
        
        frame_sendAsReader(cmd, cmd_sz);

-
-       /* Bitbang the receiver */
+       

        LINE_IN;
 
        LINE_IN;
 

-    int t, old_level = 0, edges = 0;
-    int next_bit_at = 0;
-
-       // ACK 3.6ms = 3600us * 1.5 = 5400ticks.
-       WaitTicks(5360);
+       start = GET_TICKS;

 
 

-    for( t = 0; t < 80; ++t) {
+       // ACK,  - one single "1" bit after 3.6ms
+       // 3.6ms = 3600us * 1.5 = 5400ticks.
+       WaitTicks(5400);
+       
+       next_bit_at = GET_TICKS + TAG_BIT_PERIOD;
+       
+    while ( i-- ) {
+               WDT_HIT();

         edges = 0;
         edges = 0;

-               next_bit_at += TAG_BIT_PERIOD;
-        while(timer->TC_CV < next_bit_at) {
+        while ( GET_TICKS < next_bit_at) {
+                       

             volatile uint32_t level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
             volatile uint32_t level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);

-            if(level != old_level)
-                edges++;
+            
+                       if (level != old_level)
+                ++edges;

 
             old_level = level;
         }
 
             old_level = level;
         }

-               /* expected are 42 edges (ONE) */
+               
+               next_bit_at += TAG_BIT_PERIOD;
+               
+               // We expect 42 edges (ONE)

         if(edges > 20 ) {
         if(edges > 20 ) {

-                       int t = timer->TC_CV;
-                       int c = t / TAG_BIT_PERIOD;
-                       
-                       ResetTimer(timer);
-                       legic_prng_forward(c);
-               return 0;
+                       steps = ( (GET_TICKS - start) / TAG_BIT_PERIOD);                        
+                       legic_prng_forward(steps);
+               isOK = true;
+                       goto OUT;

         }
     }
         }
     }

-
-       return -1;
+               
+OUT: ;
+       legic_prng_forward(1);
+       
+       uint8_t cmdbytes[] = {1, isOK, BYTEx(steps, 0), BYTEx(steps, 1) };
+       LogTrace(cmdbytes, sizeof(cmdbytes), start, GET_TICKS, NULL, FALSE);
+       return isOK;

 }
 
 int LegicRfReader(uint16_t offset, uint16_t len, uint8_t iv) {
 }
 
 int LegicRfReader(uint16_t offset, uint16_t len, uint8_t iv) {


@@ -475,20 +470,16 @@ int LegicRfReader(uint16_t offset, uint16_t len, uint8_t iv) {
        uint8_t isOK = 1;
        legic_card_select_t card;
        
        uint8_t isOK = 1;
        legic_card_select_t card;
        

-       LegicCommonInit();
+       LegicCommonInit(TRUE);

        
        if ( legic_select_card_iv(&card, iv) ) {
                isOK = 0;
                goto OUT;
        }
 
        
        if ( legic_select_card_iv(&card, iv) ) {
                isOK = 0;
                goto OUT;
        }
 

-       switch_off_tag_rwd();
-
-       if (len + offset >= card.cardsize)
+       if (len + offset > card.cardsize)

                len = card.cardsize - offset;
 
                len = card.cardsize - offset;
 

-       setup_phase_reader(iv);
-               

        LED_B_ON();
        while (i < len) {
                int r = legic_read_byte(offset + i, card.cmdsize);
        LED_B_ON();
        while (i < len) {
                int r = legic_read_byte(offset + i, card.cmdsize);


@@ -512,61 +503,39 @@ OUT:
 
 void LegicRfWriter(uint16_t offset, uint16_t len, uint8_t iv, uint8_t *data) {
 
 
 void LegicRfWriter(uint16_t offset, uint16_t len, uint8_t iv, uint8_t *data) {
 

-       uint8_t isOK = 1;
+       #define LOWERLIMIT 4
+       uint8_t isOK = 1, msg = 0;
+       legic_card_select_t card;

        
        

-       // UID not is writeable.
-       if ( offset <= 4 ) {
+       // uid NOT is writeable.
+       if ( offset <= LOWERLIMIT ) {

                isOK = 0;
                goto OUT;
        }
        
                isOK = 0;
                goto OUT;
        }
        

-       legic_card_select_t card;
-       
-       LegicCommonInit();
+       LegicCommonInit(TRUE);

        
        if ( legic_select_card_iv(&card, iv) ) {
                isOK = 0;
        
        if ( legic_select_card_iv(&card, iv) ) {
                isOK = 0;

+               msg = 1;

                goto OUT;
        }
        
                goto OUT;
        }
        

-       if (len + offset >= card.cardsize)
+       if ( len + offset > card.cardsize)

                len = card.cardsize - offset;
 
                len = card.cardsize - offset;
 

-       setup_phase_reader(iv);
-

     LED_B_ON();        
     LED_B_ON();        

-       int r = 0;
-       // how about we write backwards instead. no need for this extra DCF check.      
-       // index = len - cardsize
-       // stops uid 01234, 
-       /*
-       len = 20
-       offset = 5
-       
-       index = 20+5 = 25
-       if ( index > cardsize ) return -1;
-       
-       loop
-               write( data[index], index , card.addrsize);
-               --index;
-       end loop        
-       */
-       uint16_t index = len;
-       while(index > 4) {
-
-               r = legic_write_byte( index, data[ index ], card.addrsize);
-               
-               if ( r ) {
-                       Dbprintf("operation aborted @ 0x%03.3x", index);
+       while( len > 0 ) {
+               --len;          
+               if ( !legic_write_byte( len + offset, data[len], card.addrsize) ) {
+                       Dbprintf("operation failed | %02X | %02X | %02X", len + offset, len, data[len] );

                        isOK = 0;
                        goto OUT;
                }
                        isOK = 0;
                        goto OUT;
                }

-               --index;

                WDT_HIT();
        }
                WDT_HIT();
        }

-

 OUT:
 OUT:

-       cmd_send(CMD_ACK, isOK, 0,0,0,0);
+       cmd_send(CMD_ACK, isOK, msg,0,0,0);

        switch_off_tag_rwd();
        LEDsoff();      
 }
        switch_off_tag_rwd();
        LEDsoff();      
 }


@@ -644,7 +613,7 @@ void LegicRfInfo(void){
        uint8_t buf[sizeof(legic_card_select_t)] = {0x00};
        legic_card_select_t *card = (legic_card_select_t*) buf;
        
        uint8_t buf[sizeof(legic_card_select_t)] = {0x00};
        legic_card_select_t *card = (legic_card_select_t*) buf;
        

-       LegicCommonInit();
+       LegicCommonInit(FALSE);

 
        if ( legic_select_card(card) ) {
                cmd_send(CMD_ACK,0,0,0,0,0);
 
        if ( legic_select_card(card) ) {
                cmd_send(CMD_ACK,0,0,0,0,0);


@@ -685,31 +654,35 @@ static void frame_handle_tag(struct legic_frame const * const f)
        // log
        //uint8_t cmdbytes[] = {bits,   BYTEx(data, 0), BYTEx(data, 1)};
        //LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, FALSE);
        // log
        //uint8_t cmdbytes[] = {bits,   BYTEx(data, 0), BYTEx(data, 1)};
        //LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, FALSE);

-       
-       cardmem = BigBuf_get_EM_addr();
-
+       //Dbprintf("ICE: enter frame_handle_tag: %02x ", f->bits);
+               

        /* First Part of Handshake (IV) */
        if(f->bits == 7) {
 
                LED_C_ON();
 
                // Reset prng timer
        /* First Part of Handshake (IV) */
        if(f->bits == 7) {
 
                LED_C_ON();
 
                // Reset prng timer

-               ResetTimer(prng_timer);
+               //ResetTimer(prng_timer);
+               ResetTicks();

 
                // IV from reader.
                legic_prng_init(f->data);
                
 
                // IV from reader.
                legic_prng_init(f->data);
                

+               Dbprintf("ICE: IV: %02x ", f->data);
+               

                // We should have three tagtypes with three different answers.
                // We should have three tagtypes with three different answers.

-               frame_send_tag(0x3d, 6); /* 0x3d^0x26 = 0x1B */
+               legic_prng_forward(2);
+               //frame_send_tag(0x3d, 6); /* MIM1024 0x3d^0x26 = 0x1B */
+               frame_send_tag(0x1d, 6); // MIM256

                
                legic_state = STATE_IV;
                legic_read_count = 0;
                legic_prng_bc = 0;
                legic_prng_iv = f->data;
 
                
                legic_state = STATE_IV;
                legic_read_count = 0;
                legic_prng_bc = 0;
                legic_prng_iv = f->data;
 

-
-               ResetTimer(timer);
-               WaitUS(280);
+               //ResetTimer(timer);
+               //WaitUS(280);
+               WaitTicks(388);

                return;
        }
 
                return;
        }
 


@@ -721,7 +694,7 @@ static void frame_handle_tag(struct legic_frame const * const f)
          legic_state = STATE_CON;
 
                 ResetTimer(timer);
          legic_state = STATE_CON;
 
                 ResetTimer(timer);

-                WaitUS(200);
+                WaitTicks(300);

          return;
 
         } else {
          return;
 
         } else {


@@ -739,13 +712,14 @@ static void frame_handle_tag(struct legic_frame const * const f)
          uint16_t addr = f->data ^ key; 
                 addr >>= 1;
          uint8_t data = cardmem[addr];
          uint16_t addr = f->data ^ key; 
                 addr >>= 1;
          uint8_t data = cardmem[addr];

-         int hash = legic4Crc(LEGIC_READ, addr, data, 11) << 8;
+                
+         uint32_t crc = legic4Crc(LEGIC_READ, addr, data, 11) << 8;

 
 

-         legic_read_count++;
-         legic_prng_forward(legic_reqresp_drift);
+         //legic_read_count++;
+         //legic_prng_forward(legic_reqresp_drift);

 
 

-         frame_send_tag(hash | data, 12);
-                ResetTimer(timer);
+         frame_send_tag(crc | data, 12);
+                //ResetTimer(timer);

          legic_prng_forward(2);
                 WaitTicks(330);
          return;
          legic_prng_forward(2);
                 WaitTicks(330);
          return;


@@ -753,7 +727,7 @@ static void frame_handle_tag(struct legic_frame const * const f)
    }
 
    /* Write */
    }
 
    /* Write */

-   if(f->bits == 23) {
+   if (f->bits == 23 || f->bits == 21 ) {

       uint32_t key  = get_key_stream(-1, 23); //legic_frame_drift, 23);
       uint16_t addr = f->data ^ key; 
          addr >>= 1; 
       uint32_t key  = get_key_stream(-1, 23); //legic_frame_drift, 23);
       uint16_t addr = f->data ^ key; 
          addr >>= 1; 


@@ -767,7 +741,7 @@ static void frame_handle_tag(struct legic_frame const * const f)
       legic_state = STATE_DISCON;
       LED_C_OFF();
       Dbprintf("write - addr: %x, data: %x", addr, data);
       legic_state = STATE_DISCON;
       LED_C_OFF();
       Dbprintf("write - addr: %x, data: %x", addr, data);

-         // should send a ACK within 3.5ms too
+         // should send a ACK after 3.6ms 

       return;
    }
 
       return;
    }
 


@@ -776,11 +750,11 @@ static void frame_handle_tag(struct legic_frame const * const f)
       Dbprintf("IV: %03.3x", legic_prng_iv);
    }
 
       Dbprintf("IV: %03.3x", legic_prng_iv);
    }
 

-   legic_state = STATE_DISCON; 
-   legic_read_count = 0;
-   SpinDelay(10);
-   LED_C_OFF();
-   return; 
+       legic_state = STATE_DISCON; 
+       legic_read_count = 0;
+       WaitMS(10);
+       LED_C_OFF();
+       return; 

 }
 
 /* Read bit by bit untill full frame is received
 }
 
 /* Read bit by bit untill full frame is received


@@ -817,22 +791,41 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
    * measure the time between two rising edges on DIN, and no encoding on the
    * subcarrier from card to reader, so we'll just shift out our verbatim data
    * on DOUT, 1 bit is 100us. The time from reader to card frame is still unclear,
    * measure the time between two rising edges on DIN, and no encoding on the
    * subcarrier from card to reader, so we'll just shift out our verbatim data
    * on DOUT, 1 bit is 100us. The time from reader to card frame is still unclear,

-   * seems to be 300us-ish.
+   * seems to be 330us.

    */
                
        int old_level = 0, active = 0;
    */
                
        int old_level = 0, active = 0;

+       volatile int32_t level = 0;
+       

        legic_state = STATE_DISCON;
        legic_state = STATE_DISCON;

-

        legic_phase_drift = phase;
        legic_frame_drift = frame;
        legic_reqresp_drift = reqresp;
 
        legic_phase_drift = phase;
        legic_frame_drift = frame;
        legic_reqresp_drift = reqresp;
 

+
+       /* to get the stream of bits from FPGA in sim mode.*/

        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);

+       // Set up the synchronous serial port
+       //FpgaSetupSsc();
+       // connect Demodulated Signal to ADC:

        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_212K);
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_212K);

+       //FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION);
+
+       #define LEGIC_DMA_BUFFER 256
+       // The DMA buffer, used to stream samples from the FPGA
+       //uint8_t *dmaBuf = BigBuf_malloc(LEGIC_DMA_BUFFER);
+       //uint8_t *data = dmaBuf;
+       // Setup and start DMA.
+       // if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, LEGIC_DMA_BUFFER) ){
+               // if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting"); 
+               // return;
+       // }

 
 

+       //StartCountSspClk();

        /* Bitbang the receiver */
        /* Bitbang the receiver */

-       LINE_IN;
+       AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
+       AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;

 
        // need a way to determine which tagtype we are simulating
        
 
        // need a way to determine which tagtype we are simulating
        


@@ -848,30 +841,62 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
 
        LED_B_ON();
        DbpString("Starting Legic emulator, press button to end");
 
        LED_B_ON();
        DbpString("Starting Legic emulator, press button to end");

-   
+       
+       /*
+        * The mode FPGA_HF_SIMULATOR_MODULATE_212K works like this.
+        * - A 1-bit input to the FPGA becomes 8 pulses on 212kHz (fc/64) (18.88us).
+        * - A 0-bit input to the FPGA becomes an unmodulated time of 18.88us
+        *
+        * In this mode the SOF can be written as 00011101 = 0x1D
+        * The EOF can be written as 10111000 = 0xb8
+        * A logic 1 is 01
+        * A logic 0 is 10
+       volatile uint8_t b;
+       uint8_t i = 0;
+       while( !BUTTON_PRESS() ) {
+               WDT_HIT();
+
+               // not sending anything.
+        if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+            AT91C_BASE_SSC->SSC_THR = 0x00;
+        }
+
+               // receive
+               if ( AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY ) {
+                       b = (uint8_t) AT91C_BASE_SSC->SSC_RHR;
+                       bd[i] = b;
+                       ++i;
+       //              if(OutOfNDecoding(b & 0x0f))
+       //                              *len = Uart.byteCnt;
+                       }
+               
+       }
+        */
+

        while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
        while(!BUTTON_PRESS() && !usb_poll_validate_length()) {

-               volatile uint32_t level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
+               
+               level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);

 
                uint32_t time = GET_TICKS;
 
                if (level != old_level) {
 
                uint32_t time = GET_TICKS;
 
                if (level != old_level) {

-                       
-                       if (level) {
+                       if (level == 1) {

 
 

-                               ResetTicks();
-                               
+                               //Dbprintf("start, %u ", time);
+                               StartTicks();
+                               // did we get a signal 

                                if (FUZZ_EQUAL(time, RWD_TIME_1, RWD_TIME_FUZZ)) {
                                if (FUZZ_EQUAL(time, RWD_TIME_1, RWD_TIME_FUZZ)) {

-                                       /* 1 bit */
+                                       // 1 bit 

                                        emit(1);
                                        active = 1;
                                        LED_A_ON();
                                } else if (FUZZ_EQUAL(time, RWD_TIME_0, RWD_TIME_FUZZ)) {
                                        emit(1);
                                        active = 1;
                                        LED_A_ON();
                                } else if (FUZZ_EQUAL(time, RWD_TIME_0, RWD_TIME_FUZZ)) {

-                                       /* 0 bit */
+                                       // 0 bit 

                                        emit(0);
                                        active = 1;
                                        LED_A_ON();
                                } else if (active) {
                                        emit(0);
                                        active = 1;
                                        LED_A_ON();
                                } else if (active) {

-                                       /* invalid */
+                                       // invalid 

                                        emit(-1);
                                        active = 0;
                                        LED_A_OFF();
                                        emit(-1);
                                        active = 0;
                                        LED_A_OFF();


@@ -879,8 +904,9 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
                        }
                }
 
                        }
                }
 

+       

                /* Frame end */
                /* Frame end */

-               if(time >= (RWD_TIME_1+RWD_TIME_FUZZ) && active) {
+               if(time >= (RWD_TIME_1 + RWD_TIME_FUZZ) && active) {

                        emit(-1);
                        active = 0;
                        LED_A_OFF();
                        emit(-1);
                        active = 0;
                        LED_A_OFF();


@@ -891,19 +917,23 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
                * shutdown in its status register. Reading the SR has the
                * side-effect of clearing any pending state in there.
                */
                * shutdown in its status register. Reading the SR has the
                * side-effect of clearing any pending state in there.
                */

-               if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA))
+               //if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA))
+               if(time >= (20 * RWD_TIME_1) )

                        StopTicks();
 
                old_level = level;
                WDT_HIT();
                        StopTicks();
 
                old_level = level;
                WDT_HIT();

-       }
+}

 
        WDT_HIT();
 
        WDT_HIT();

+       DbpString("LEGIC Prime emulator stopped");

        switch_off_tag_rwd();
        switch_off_tag_rwd();

+       FpgaDisableSscDma();

        LEDsoff();
        cmd_send(CMD_ACK, 1, 0, 0, 0, 0);
 }
 
        LEDsoff();
        cmd_send(CMD_ACK, 1, 0, 0, 0, 0);
 }
 

+

 //-----------------------------------------------------------------------------
 // Code up a string of octets at layer 2 (including CRC, we don't generate
 // that here) so that they can be transmitted to the reader. Doesn't transmit
 //-----------------------------------------------------------------------------
 // Code up a string of octets at layer 2 (including CRC, we don't generate
 // that here) so that they can be transmitted to the reader. Doesn't transmit