]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/legicrf.c
CHG: "hf legic write" with these I managed to get one byte written. Its a start.
[proxmark3-svn] / armsrc / legicrf.c
index 2d02b636fc2cea8af8b1b28262dbcc33d7567b72..ae24f007f1801ea43e0d1c386ad0cb47815f7709 100644 (file)
@@ -1,5 +1,6 @@
 //-----------------------------------------------------------------------------
 // (c) 2009 Henryk Plötz <henryk@ploetzli.ch>
+//     2016 Iceman
 //
 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
 // at your option, any later version. See the LICENSE.txt file for the text of
@@ -85,12 +86,14 @@ static void setup_timer(void) {
 #define FUZZ_EQUAL(value, target, fuzz) ((value) > ((target)-(fuzz)) && (value) < ((target)+(fuzz)))
 
 #ifndef SHORT_COIL
-# define SHORT_COIL    LOW(GPIO_SSC_DOUT);
+# define SHORT_COIL     LOW(GPIO_SSC_DOUT);
 #endif
 #ifndef OPEN_COIL
 # define OPEN_COIL     HIGH(GPIO_SSC_DOUT);
 #endif
-
+#ifndef LINE_IN
+# define LINE_IN  AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
+#endif
 // Pause pulse,  off in 20us / 30ticks,
 // ONE / ZERO bit pulse,  
 //    one == 80us / 120ticks
@@ -102,7 +105,7 @@ static void setup_timer(void) {
                WaitTicks( (RWD_TIME_PAUSE) ); \
                OPEN_COIL; \
                WaitTicks((x)); \
-       } while (0) 
+       } while (0); 
 #endif
 
 // ToDo: define a meaningful maximum size for auth_table. The bigger this is, the lower will be the available memory for traces. 
@@ -140,14 +143,13 @@ static void frame_clean(struct legic_frame * const f) {
 
 /* Generate Keystream */
 uint32_t get_key_stream(int skip, int count) {
-       uint32_t key = 0;
+
        int i;
 
        // Use int to enlarge timer tc to 32bit
        legic_prng_bc += prng_timer->TC_CV;
 
        // reset the prng timer.
-       ResetTimer(prng_timer);
 
        /* If skip == -1, forward prng time based */
        if(skip == -1) {
@@ -161,55 +163,37 @@ uint32_t get_key_stream(int skip, int count) {
 
        i = (count == 6) ? -1 : legic_read_count;
 
-       /* Write Time Data into LOG */
-       // uint8_t *BigBuf = BigBuf_get_addr();
-       // BigBuf[OFFSET_LOG+128+i] = legic_prng_count();
-       // BigBuf[OFFSET_LOG+256+i*4]   = (legic_prng_bc >> 0) & 0xff;
-       // BigBuf[OFFSET_LOG+256+i*4+1] = (legic_prng_bc >> 8) & 0xff;
-       // BigBuf[OFFSET_LOG+256+i*4+2] = (legic_prng_bc >>16) & 0xff;
-       // BigBuf[OFFSET_LOG+256+i*4+3] = (legic_prng_bc >>24) & 0xff;
-       // BigBuf[OFFSET_LOG+384+i] = count;
-
        /* Generate KeyStream */
-       for(i=0; i<count; i++) {
-               key |= legic_prng_get_bit() << i;
-               legic_prng_forward(1);
-       }
-       return key;
+       return legic_prng_get_bits(count);
 }
 
 /* Send a frame in tag mode, the FPGA must have been set up by
  * LegicRfSimulate
  */
-void frame_send_tag(uint16_t response, uint8_t bits, uint8_t crypt) {
+void frame_send_tag(uint16_t response, uint8_t bits) {
+
+       uint16_t mask = 1;
+       
        /* Bitbang the response */
-       LOW(GPIO_SSC_DOUT);
+       SHORT_COIL;
        AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
        AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
 
-       /* Use time to crypt frame */
-       if(crypt) {
-               legic_prng_forward(2); /* TAG_FRAME_WAIT -> shift by 2 */
-               response ^= legic_prng_get_bits(bits);
-       }
+        /* TAG_FRAME_WAIT -> shift by 2 */
+       legic_prng_forward(2);
+       response ^= legic_prng_get_bits(bits);
 
        /* Wait for the frame start */
-       WaitUS( TAG_FRAME_WAIT );
-
-       uint8_t bit = 0;
-       for(int i = 0; i < bits; i++) {
+       WaitTicks( TAG_FRAME_WAIT );
 
-               bit = response & 1;
-               response >>= 1;
-
-               if (bit)
-                       HIGH(GPIO_SSC_DOUT);
+       for (; mask < BITMASK(bits); mask <<= 1) {      
+               if (response & mask)
+                       OPEN_COIL
                else
-                       LOW(GPIO_SSC_DOUT);
-                 
-               WaitUS(100);
+                       SHORT_COIL
+               WaitTicks(TAG_BIT_PERIOD);
    }
-   LOW(GPIO_SSC_DOUT);
+   SHORT_COIL;
 }
 
 /* Send a frame in reader mode, the FPGA must have been set up by
@@ -217,24 +201,23 @@ void frame_send_tag(uint16_t response, uint8_t bits, uint8_t crypt) {
  */
 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);
                                
        for (; mask < BITMASK(bits); mask <<= 1) {      
                if (send & mask)
-                       COIL_PULSE(RWD_TIME_1);
+                       COIL_PULSE(RWD_TIME_1)
                else
-                       COIL_PULSE(RWD_TIME_0);
+                       COIL_PULSE(RWD_TIME_0)
        }
 
        // Final pause to mark the end of the frame
        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)};
        LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, TRUE);
 }
 
@@ -269,9 +252,6 @@ static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits) {
        volatile uint32_t level = 0;
        
        frame_clean(f);
-               
-       AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
-       AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
        
        // calibrate the prng.
        legic_prng_forward(2);
@@ -360,10 +340,11 @@ static void LegicCommonInit(void) {
        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_ODR = GPIO_SSC_DIN;
+       
        // reserve a cardmem,  meaning we can use the tracelog function in bigbuff easier.
        cardmem = BigBuf_get_EM_addr();
        memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE);
@@ -377,7 +358,7 @@ static void LegicCommonInit(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();
 }
@@ -394,9 +375,10 @@ int legic_read_byte( uint16_t index, uint8_t cmd_sz) {
 
        uint8_t byte, crc, calcCrc = 0;
        uint32_t cmd = (index << 1) | LEGIC_READ;
-
-       //WaitTicks(366); 
-       WaitTicks(330); 
+       
+       // 90ticks = 60us (should be 100us but crc calc takes time.)
+       //WaitTicks(330); // 330ticks prng(4) - works
+       WaitTicks(240); // 240ticks prng(3) - works
        
        frame_sendAsReader(cmd, cmd_sz);
        frame_receiveAsReader(&current_frame, 12);
@@ -407,11 +389,11 @@ int legic_read_byte( uint16_t index, uint8_t cmd_sz) {
        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;
        }
 
-       legic_prng_forward(4);
+       legic_prng_forward(3);
        return byte;
 }
 
@@ -420,68 +402,75 @@ 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
  */
-//int legic_write_byte(int byte, int addr, int addr_sz, int PrngCorrection) {
-int legic_write_byte(uint8_t byte, uint16_t addr, uint8_t addr_sz) {
+bool legic_write_byte(uint16_t index, uint8_t byte, uint8_t addr_sz) {
 
-    //do not write UID, CRC at offset 0-4.
-       if (addr <= 4) return 0;
+       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
+/*     
        crc_clear(&legic_crc);
-       crc_update(&legic_crc, 0, 1); /* CMD_WRITE */
-       crc_update(&legic_crc, addr, addr_sz);
+       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, addr, byte, addr_sz+1);
-       if ( crc != crc2 ) {
-               Dbprintf("crc is missmatch");
-               return 1;
-       }
+       crc = crc_finish(&legic_crc);
+*/
+       crc = legic4Crc(LEGIC_WRITE, index, byte, addr_sz+1);
+
        // send write command
-       uint32_t cmd = ((crc     <<(addr_sz+1+8)) //CRC
-                   |(byte    <<(addr_sz+1))   //Data
-                   |(addr    <<1)             //Address
-                   | LEGIC_WRITE);             //CMD = Write
-                                  
-    uint32_t cmd_sz = addr_sz+1+8+4;          //crc+data+cmd
-
-    legic_prng_forward(2); /* we wait anyways */
+       uint32_t cmd = LEGIC_WRITE;
+       cmd |= index << 1;                        // index
+       cmd |= byte  << (addr_sz+1);  // Data   
+       cmd     |= (crc & 0xF ) << (addr_sz+1+8);       // CRC
+
+       /* Bitbang the response */
+       //AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
        
-       WaitTicks(330);
+       WaitTicks(240);
        
        frame_sendAsReader(cmd, cmd_sz);
-   
-       AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
-       AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
-
-       // wait for ack
-    int t, old_level = 0, edges = 0;
-    int next_bit_at = 0;
+       
+       LINE_IN;
 
-       WaitUS(TAG_FRAME_WAIT);
+       start = GET_TICKS;
 
-    for( t = 0; t < 80; ++t) {
+       // ACK,  - one single "1" bit after 3.6ms
+       // 3.6ms = 3600us * 1.5 = 5400ticks.
+       WaitTicks(5300);
+       
+       next_bit_at = GET_TICKS + TAG_BIT_PERIOD;
+       
+    while ( i-- ) {
+               WDT_HIT();
         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);
-            if(level != old_level)
-                edges++;
+            
+                       if (level != old_level)
+                ++edges;
 
             old_level = level;
         }
-        if(edges > 20 ) { /* expected are 42 edges */
-                       int t = timer->TC_CV;
-                       int c = t / TAG_BIT_PERIOD;
-                       
-                       ResetTimer(timer);
-                       legic_prng_forward(c);
-               return 0;
+               
+               next_bit_at += TAG_BIT_PERIOD;
+               
+               // We expect 42 edges (ONE)
+        if(edges > 20 ) {
+                       steps = ( (GET_TICKS - start) / TAG_BIT_PERIOD);                        
+                       legic_prng_forward(steps);
+               isOK = true;
+                       goto OUT;
         }
     }
-
-       ResetTimer(timer);
-       return -1;
+               
+OUT: ;
+       // log
+       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) {
@@ -497,15 +486,11 @@ int LegicRfReader(uint16_t offset, uint16_t len, uint8_t iv) {
                goto OUT;
        }
 
-       switch_off_tag_rwd();
-
        if (len + offset >= card.cardsize)
                len = card.cardsize - offset;
 
-       setup_phase_reader(iv);
-               
        LED_B_ON();
-       while (i <= len) {
+       while (i < len) {
                int r = legic_read_byte(offset + i, card.cmdsize);
                
                if (r == -1 || BUTTON_PRESS()) {                        
@@ -525,53 +510,18 @@ OUT:
     return 0;
 }
 
-/*int _LegicRfWriter(int offset, int bytes, int addr_sz, uint8_t *BigBuf, int RoundBruteforceValue) {
-       int byte_index=0;
-
-    LED_B_ON();
-       setup_phase_reader(iv);
-    //legic_prng_forward(2);
-       while(byte_index < bytes) {
-               int r;
-
-               //check if the DCF should be changed
-               if ( (offset == 0x05) && (bytes == 0x02) ) {
-                       //write DCF in reverse order (addr 0x06 before 0x05)
-                       r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz, RoundBruteforceValue);
-                       //legic_prng_forward(1);
-                       if(r == 0) {
-                               byte_index++;
-                               r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz, RoundBruteforceValue);
-                       }
-                       //legic_prng_forward(1);
-               }
-               else {
-                       r = legic_write_byte(BigBuf[byte_index+offset], byte_index+offset, addr_sz, RoundBruteforceValue);
-               }
-               if((r != 0) || BUTTON_PRESS()) {
-                       Dbprintf("operation aborted @ 0x%03.3x", byte_index);
-       switch_off_tag_rwd();
-                       LED_B_OFF();
-                       LED_C_OFF();
-                       return -1;
-               }
-
-        WDT_HIT();
-               byte_index++;
-        if(byte_index & 0x10) LED_C_ON(); else LED_C_OFF();
-       }
-    LED_B_OFF();
-    LED_C_OFF();
-    DbpString("write successful");
-    return 0;
-}*/
-
-void LegicRfWriter(uint16_t offset, uint16_t bytes, uint8_t iv) {
+void LegicRfWriter(uint16_t offset, uint16_t len, uint8_t iv, uint8_t *data) {
 
-       int byte_index = 0;  
+       #define LOWERLIMIT 4
        uint8_t isOK = 1;
        legic_card_select_t card;
        
+       // uid NOT is writeable.
+       if ( offset <= LOWERLIMIT ) {
+               isOK = 0;
+               goto OUT;
+       }
+       
        LegicCommonInit();
        
        if ( legic_select_card_iv(&card, iv) ) {
@@ -579,131 +529,27 @@ void LegicRfWriter(uint16_t offset, uint16_t bytes, uint8_t iv) {
                goto OUT;
        }
        
-       switch_off_tag_rwd();
-       
-       switch(card.tagtype) {
-               case 0x0d:
-                       if(offset+bytes > 22) {
-                               Dbprintf("Error: can not write to 0x%03.3x on MIM22", offset + bytes);
-                               return;
-                       }
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM22 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset + bytes);
-                       break;
-               case 0x1d:
-                       if(offset+bytes > 0x100) {
-                               Dbprintf("Error: can not write to 0x%03.3x on MIM256", offset + bytes);
-                               return;
-                       }
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM256 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset + bytes);
-                       break;
-               case 0x3d:
-                       if(offset+bytes > 0x400) {
-                       Dbprintf("Error: can not write to 0x%03.3x on MIM1024", offset + bytes);
-                       return;
-               }
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM1024 card found, writing 0x%03.3x - 0x%03.3x ...", offset, offset + bytes);
-                       break;
-               default:
-            return;
+       if ( len + offset + LOWERLIMIT >= card.cardsize) {
+               isOK = 0;
+               goto OUT;
        }
 
-    LED_B_ON();
-       setup_phase_reader(iv);
-       
-       int r = 0;
-       while(byte_index < bytes) {
-
-               //check if the DCF should be changed
-               if ( ((byte_index+offset) == 0x05) && (bytes >= 0x02) ) {
-                       //write DCF in reverse order (addr 0x06 before 0x05)
-                       r = legic_write_byte(cardmem[(0x06-byte_index)], (0x06-byte_index), card.addrsize);
-
-                       // write second byte on success
-                       if(r == 0) {
-                               byte_index++;
-                               r = legic_write_byte(cardmem[(0x06-byte_index)], (0x06-byte_index), card.addrsize);
-                       }
-               }
-               else {
-                       r = legic_write_byte(cardmem[byte_index+offset], byte_index+offset, card.addrsize);
-               }
-               
-               if ((r != 0) || BUTTON_PRESS()) {
-                       Dbprintf("operation aborted @ 0x%03.3x", byte_index);
+    LED_B_ON();        
+       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;
                }
-
-        WDT_HIT();
-               byte_index++;
+               WDT_HIT();
        }
-
 OUT:
        cmd_send(CMD_ACK, isOK, 0,0,0,0);
        switch_off_tag_rwd();
        LEDsoff();      
 }
 
-void LegicRfRawWriter(int address, int byte, uint8_t iv) {
-
-       int byte_index = 0, addr_sz = 0;
-       
-       LegicCommonInit();
-       
-       if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card");
-       
-       uint32_t tag_type = setup_phase_reader(iv);
-       
-       switch_off_tag_rwd();
-       
-       switch(tag_type) {
-               case 0x0d:
-                       if(address > 22) {
-                               Dbprintf("Error: can not write to 0x%03.3x on MIM22", address);
-                               return;
-                       }
-                       addr_sz = 5;
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM22 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte);
-                       break;
-               case 0x1d:
-                       if(address > 0x100) {
-                               Dbprintf("Error: can not write to 0x%03.3x on MIM256", address);
-                               return;
-                       }
-                       addr_sz = 8;
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM256 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte);
-                       break;
-               case 0x3d:
-                       if(address > 0x400) {
-                       Dbprintf("Error: can not write to 0x%03.3x on MIM1024", address);
-                       return;
-               }
-                       addr_sz = 10;
-                       if ( MF_DBGLEVEL >= 2) Dbprintf("MIM1024 card found, writing at addr 0x%03.3x - value 0x%03.3x ...", address, byte);
-                       break;
-               default:
-                       Dbprintf("No or unknown card found, aborting");
-            return;
-       }
-       
-       Dbprintf("integer value: %d address: %d  addr_sz: %d", byte, address, addr_sz);
-    LED_B_ON();
-       
-       setup_phase_reader(iv);
-               
-       int r = legic_write_byte(byte, address, addr_sz);
-               
-       if((r != 0) || BUTTON_PRESS()) {
-               Dbprintf("operation aborted @ 0x%03.3x (%1d)", byte_index, r);
-               switch_off_tag_rwd();
-               LEDsoff();
-               return;
-       }
-
-    LEDsoff();
-    if ( MF_DBGLEVEL >= 1) DbpString("write successful");
-}
-
 int legic_select_card_iv(legic_card_select_t *p_card, uint8_t iv){
 
        if ( p_card == NULL ) return 1;
@@ -738,8 +584,42 @@ int legic_select_card(legic_card_select_t *p_card){
        return legic_select_card_iv(p_card, 0x01);
 }
 
+//-----------------------------------------------------------------------------
+// Work with emulator memory
+// 
+// Note: we call FpgaDownloadAndGo(FPGA_BITSTREAM_HF) here although FPGA is not
+// involved in dealing with emulator memory. But if it is called later, it might
+// destroy the Emulator Memory.
+//-----------------------------------------------------------------------------
+// arg0 = offset
+// arg1 = num of bytes
+void LegicEMemSet(uint32_t arg0, uint32_t arg1, uint8_t *data) {
+       FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+       legic_emlset_mem(data, arg0, arg1);
+}
+// arg0 = offset
+// arg1 = num of bytes
+void LegicEMemGet(uint32_t arg0, uint32_t arg1) {
+       FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+       uint8_t buf[USB_CMD_DATA_SIZE] = {0x00};
+       legic_emlget_mem(buf, arg0, arg1);
+       LED_B_ON();
+       cmd_send(CMD_ACK, arg0, arg1, 0, buf, USB_CMD_DATA_SIZE);
+       LED_B_OFF();
+}
+void legic_emlset_mem(uint8_t *data, int offset, int numofbytes) {
+       cardmem = BigBuf_get_EM_addr();
+       memcpy(cardmem + offset, data, numofbytes);
+}
+void legic_emlget_mem(uint8_t *data, int offset, int numofbytes) {
+       cardmem = BigBuf_get_EM_addr();
+       memcpy(data, cardmem + offset, numofbytes);
+}
+
 void LegicRfInfo(void){
 
+       int r;
+       
        uint8_t buf[sizeof(legic_card_select_t)] = {0x00};
        legic_card_select_t *card = (legic_card_select_t*) buf;
        
@@ -752,7 +632,7 @@ void LegicRfInfo(void){
 
        // read UID bytes
        for ( uint8_t i = 0; i < sizeof(card->uid); ++i) {
-               int r = legic_read_byte(i, card->cmdsize);
+               r = legic_read_byte(i, card->cmdsize);
                if ( r == -1 ) {
                        cmd_send(CMD_ACK,0,0,0,0,0);
                        goto OUT;
@@ -760,8 +640,17 @@ void LegicRfInfo(void){
                card->uid[i] = r & 0xFF;
        }
 
-       cmd_send(CMD_ACK, 1, 0, 0, buf, sizeof(legic_card_select_t));
+       // MCC byte.
+       r = legic_read_byte(4, card->cmdsize);
+       uint32_t calc_mcc =  CRC8Legic(card->uid, 4);;
+       if ( r != calc_mcc) {
+               cmd_send(CMD_ACK,0,0,0,0,0);
+               goto OUT;
+       }
        
+       // OK
+       cmd_send(CMD_ACK, 1, 0, 0, buf, sizeof(legic_card_select_t));
+
 OUT:
        switch_off_tag_rwd();
        LEDsoff();
@@ -772,32 +661,40 @@ OUT:
  */
 static void frame_handle_tag(struct legic_frame const * const f)
 {
-       uint8_t *BigBuf = BigBuf_get_addr();
+       // 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();
 
-   /* First Part of Handshake (IV) */
-   if(f->bits == 7) {
+       /* First Part of Handshake (IV) */
+       if(f->bits == 7) {
+
+               LED_C_ON();
 
-        LED_C_ON();
-        
                // Reset prng timer
                ResetTimer(prng_timer);
+
+               // IV from reader.
+               legic_prng_init(f->data);
                
-        legic_prng_init(f->data);
-        frame_send_tag(0x3d, 6, 1); /* 0x3d^0x26 = 0x1B */
-        legic_state = STATE_IV;
-        legic_read_count = 0;
-        legic_prng_bc = 0;
-        legic_prng_iv = f->data;
+               // We should have three tagtypes with three different answers.
+               frame_send_tag(0x3d, 6); /* 0x3d^0x26 = 0x1B */
+               
+               legic_state = STATE_IV;
+               legic_read_count = 0;
+               legic_prng_bc = 0;
+               legic_prng_iv = f->data;
+
+
                ResetTimer(timer);
                WaitUS(280);
-        return;
-   }
+               return;
+       }
 
    /* 0x19==??? */
    if(legic_state == STATE_IV) {
-      int local_key = get_key_stream(3, 6);
+      uint32_t local_key = get_key_stream(3, 6);
       int xored = 0x39 ^ local_key;
       if((f->bits == 6) && (f->data == xored)) {
          legic_state = STATE_CON;
@@ -817,59 +714,47 @@ static void frame_handle_tag(struct legic_frame const * const f)
    /* Read */
    if(f->bits == 11) {
       if(legic_state == STATE_CON) {
-         int key   = get_key_stream(2, 11); //legic_phase_drift, 11);
-         int addr  = f->data ^ key; addr = addr >> 1;
-         int data = BigBuf[addr];
+         uint32_t key = get_key_stream(2, 11); //legic_phase_drift, 11);
+         uint16_t addr = f->data ^ key; 
+                addr >>= 1;
+         uint8_t data = cardmem[addr];
          int hash = legic4Crc(LEGIC_READ, addr, data, 11) << 8;
-         BigBuf[OFFSET_LOG+legic_read_count] = (uint8_t)addr;
-         legic_read_count++;
 
-         //Dbprintf("Data:%03.3x, key:%03.3x, addr: %03.3x, read_c:%u", f->data, key, addr, read_c);
+         legic_read_count++;
          legic_prng_forward(legic_reqresp_drift);
 
-         frame_send_tag(hash | data, 12, 1);
-
+         frame_send_tag(hash | data, 12);
                 ResetTimer(timer);
          legic_prng_forward(2);
-                WaitUS(180);
+                WaitTicks(330);
          return;
       }
    }
 
    /* Write */
    if(f->bits == 23) {
-      int key   = get_key_stream(-1, 23); //legic_frame_drift, 23);
-      int addr  = f->data ^ key; addr = addr >> 1; addr = addr & 0x3ff;
-      int data  = f->data ^ key; data = data >> 11; data = data & 0xff;
-
+      uint32_t key  = get_key_stream(-1, 23); //legic_frame_drift, 23);
+      uint16_t addr = f->data ^ key; 
+         addr >>= 1; 
+         addr &= 0x3ff;
+      uint32_t data = f->data ^ key; 
+         data >>= 11; 
+         data &= 0xff;
+
+         cardmem[addr] = data;
       /* write command */
       legic_state = STATE_DISCON;
       LED_C_OFF();
       Dbprintf("write - addr: %x, data: %x", addr, data);
+         // should send a ACK within 3.5ms too
       return;
    }
 
    if(legic_state != STATE_DISCON) {
       Dbprintf("Unexpected: sz:%u, Data:%03.3x, State:%u, Count:%u", f->bits, f->data, legic_state, legic_read_count);
-      int i;
       Dbprintf("IV: %03.3x", legic_prng_iv);
-      for(i = 0; i<legic_read_count; i++) {
-         Dbprintf("Read Nb: %u, Addr: %u", i, BigBuf[OFFSET_LOG+i]);
-      }
-
-      for(i = -1; i<legic_read_count; i++) {
-         uint32_t t;
-         t  = BigBuf[OFFSET_LOG+256+i*4];
-         t |= BigBuf[OFFSET_LOG+256+i*4+1] << 8;
-         t |= BigBuf[OFFSET_LOG+256+i*4+2] <<16;
-         t |= BigBuf[OFFSET_LOG+256+i*4+3] <<24;
-
-         Dbprintf("Cycles: %u, Frame Length: %u, Time: %u", 
-            BigBuf[OFFSET_LOG+128+i],
-            BigBuf[OFFSET_LOG+384+i],
-            t);
-      }
    }
+
    legic_state = STATE_DISCON; 
    legic_read_count = 0;
    SpinDelay(10);
@@ -913,6 +798,9 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
    * on DOUT, 1 bit is 100us. The time from reader to card frame is still unclear,
    * seems to be 300us-ish.
    */
+               
+       int old_level = 0, active = 0;
+       legic_state = STATE_DISCON;
 
        legic_phase_drift = phase;
        legic_frame_drift = frame;
@@ -920,30 +808,36 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
 
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-       FpgaSetupSsc();
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_212K);
 
        /* Bitbang the receiver */
-       AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
-       AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
+       LINE_IN;
+
+       // need a way to determine which tagtype we are simulating
+       
+       // hook up emulator memory  
+       cardmem = BigBuf_get_EM_addr();
+       
+       clear_trace();
+       set_tracing(TRUE);
 
-       //setup_timer();
        crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0);
 
-       int old_level = 0;
-       int active = 0;
-       legic_state = STATE_DISCON;
+       StartTicks();
 
        LED_B_ON();
        DbpString("Starting Legic emulator, press button to end");
    
        while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
-               int level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
-               int time = timer->TC_CV;
+               volatile uint32_t level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
+
+               uint32_t time = GET_TICKS;
+
+               if (level != old_level) {
+                       
+                       if (level) {
 
-               if(level != old_level) {
-                       if(level == 1) {
-                               timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
+                               ResetTicks();
                                
                                if (FUZZ_EQUAL(time, RWD_TIME_1, RWD_TIME_FUZZ)) {
                                        /* 1 bit */
@@ -971,15 +865,22 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
                        LED_A_OFF();
                }
 
-               if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA)) {
-                       timer->TC_CCR = AT91C_TC_CLKDIS;
-               }
+               /*
+               * Disable the counter, Then wait for the clock to acknowledge the
+               * 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))
+                       StopTicks();
 
                old_level = level;
                WDT_HIT();
        }
-       if ( MF_DBGLEVEL >= 1) DbpString("Stopped");
+
+       WDT_HIT();
+       switch_off_tag_rwd();
        LEDsoff();
+       cmd_send(CMD_ACK, 1, 0, 0, 0, 0);
 }
 
 //-----------------------------------------------------------------------------
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