]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - armsrc/lfops.c
fixed compiling under ubuntu with devkitARM_r41
[proxmark3-svn] / armsrc / lfops.c
index 3b7216ed35d189eac699296aba56ee33f90d2347..8d4e2dc9c84e903e23d9051cde65eaafd6f07cac 100644 (file)
@@ -598,7 +598,7 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
 {
        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;
+  uint32_t hi2=0, hi=0, lo=0;
 
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
@@ -735,15 +735,15 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
                        {
                                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 (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)
                                        {
@@ -751,7 +751,7 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
                                                *low = lo;
                                                return;
                                        }
-                                       hi2=0;
+          hi2=0;
                                        hi=0;
                                        lo=0;
                                        found=0;
@@ -759,16 +759,16 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
                        }
                        if (found) {
                                if (dest[idx] && (!dest[idx+1]) ) {
-                                       hi2=(hi2<<1)|(hi>>31);
+          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);
+          hi2=(hi2<<1)|(hi>>31);
                                        hi=(hi<<1)|(lo>>31);
                                        lo=(lo<<1)|1;
                                } else {
                                        found=0;
-                                       hi2=0;
+          hi2=0;
                                        hi=0;
                                        lo=0;
                                }
@@ -779,14 +779,14 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
                                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 (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)
                                        {
@@ -805,7 +805,6 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
        }
 }
 
-
 /*------------------------------
  * T5555/T5557/T5567 routines
  *------------------------------
@@ -902,11 +901,11 @@ void T55xxWriteBlock(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t PwdMod
        // Opcode
        T55xxWriteBit(1);
        T55xxWriteBit(0); //Page 0
-       if (PwdMode == 1){
-               // Pwd
-               for (i = 0x80000000; i != 0; i >>= 1)
-                       T55xxWriteBit(Pwd & i);
-       }       
+  if (PwdMode == 1){
+    // Pwd
+    for (i = 0x80000000; i != 0; i >>= 1)
+      T55xxWriteBit(Pwd & i);
+  }
        // Lock bit
        T55xxWriteBit(0);
 
@@ -926,13 +925,12 @@ void T55xxWriteBlock(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t PwdMod
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
 }
 
-
-// Read one card block in page 0 
+// Read one card block in page 0
 void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode)
 {
        uint8_t *dest = (uint8_t *)BigBuf;
        int m=0, i=0;
+  
        m = sizeof(BigBuf);
   // Clear destination buffer before sending the command
        memset(dest, 128, m);
@@ -940,19 +938,19 @@ void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode)
        SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
        // Now set up the SSC to get the ADC samples that are now streaming at us.
        FpgaSetupSsc();
-
+  
        LED_D_ON();
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
-
+  
        // Give it a bit of time for the resonant antenna to settle.
        // And for the tag to fully power up
        SpinDelay(150);
-
+  
        // Now start writting
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        SpinDelayUs(START_GAP);
-
+  
        // Opcode
        T55xxWriteBit(1);
        T55xxWriteBit(0); //Page 0
@@ -960,7 +958,7 @@ void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode)
                // Pwd
                for (i = 0x80000000; i != 0; i >>= 1)
                        T55xxWriteBit(Pwd & i);
-       }       
+       }
        // Lock bit
        T55xxWriteBit(0);
        // Block
@@ -970,8 +968,8 @@ void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode)
   // Turn field on to read the response
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
-
-       // Now do the acquisition 
+  
+       // Now do the acquisition
        i = 0;
        for(;;) {
                if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
@@ -981,22 +979,22 @@ void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode)
                        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;
+      //                       if(dest[i] < 127) dest[i] = 0; else dest[i] = 1;
                        i++;
                        if (i >= m) break;
                }
        }
-
+  
   FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
        LED_D_OFF();
        DbpString("DONE!");
 }
 
 // Read card traceability data (page 1)
-void T55xxReadTrace(void){ 
+void T55xxReadTrace(void){
        uint8_t *dest = (uint8_t *)BigBuf;
        int m=0, i=0;
+  
        m = sizeof(BigBuf);
   // Clear destination buffer before sending the command
        memset(dest, 128, m);
@@ -1004,19 +1002,19 @@ void T55xxReadTrace(void){
        SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
        // Now set up the SSC to get the ADC samples that are now streaming at us.
        FpgaSetupSsc();
-
+  
        LED_D_ON();
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
-
+  
        // Give it a bit of time for the resonant antenna to settle.
        // And for the tag to fully power up
        SpinDelay(150);
-
+  
        // Now start writting
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
        SpinDelayUs(START_GAP);
-
+  
        // Opcode
        T55xxWriteBit(1);
        T55xxWriteBit(1); //Page 1
@@ -1024,8 +1022,8 @@ void T55xxReadTrace(void){
   // Turn field on to read the response
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
-
-       // Now do the acquisition 
+  
+       // Now do the acquisition
        i = 0;
        for(;;) {
                if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
@@ -1037,7 +1035,7 @@ void T55xxReadTrace(void){
                        if (i >= m) break;
                }
        }
-
+  
   FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
        LED_D_OFF();
        DbpString("DONE!");
@@ -1047,9 +1045,9 @@ void T55xxReadTrace(void){
 // Copy HID id to card and setup block 0 config
 void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT)
 {
-       int data1, data2, data3, data4, data5, data6; //up to six blocks for long format
+       int data1=0, data2=0, data3=0, data4=0, data5=0, data6=0; //up to six blocks for long format
        int last_block = 0;
-
+  
   if (longFMT){
          // Ensure no more than 84 bits supplied
          if (hi2>0xFFFFF) {
@@ -1065,7 +1063,7 @@ void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT)
                  else
                          data1 |= (1<<((3-i)*2)); // 0 -> 01
          }
-
+    
        data2 = 0;
        for (int i=0;i<16;i++) {
                if (hi2 & (1<<(15-i)))
@@ -1073,7 +1071,7 @@ void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT)
                else
                        data2 |= (1<<((15-i)*2)); // 0 -> 01
     }
-
+    
        data3 = 0;
        for (int i=0;i<16;i++) {
                if (hi & (1<<(31-i)))
@@ -1081,7 +1079,7 @@ void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT)
                else
                        data3 |= (1<<((15-i)*2)); // 0 -> 01
        }
-  
+    
        data4 = 0;
        for (int i=0;i<16;i++) {
                if (hi & (1<<(15-i)))
@@ -1097,7 +1095,7 @@ void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT)
                else
                        data5 |= (1<<((15-i)*2)); // 0 -> 01
        }
-  
+    
        data6 = 0;
        for (int i=0;i<16;i++) {
                if (lo & (1<<(15-i)))
@@ -1106,25 +1104,25 @@ void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT)
                        data6 |= (1<<((15-i)*2)); // 0 -> 01
     }
   }
-  else {       
+  else {
          // Ensure no more than 44 bits supplied
          if (hi>0xFFF) {
                  DbpString("Tags can only have 44 bits.");
                  return;
          }
-
+    
        // Build the 3 data blocks for supplied 44bit ID
        last_block = 3;
        
        data1 = 0x1D000000; // load preamble
-  
-       for (int i=0;i<12;i++) {
-               if (hi & (1<<(12-i)))
-                       data1 |= (1<<(((12-i)*2)+1)); // 1 -> 10
-               else
-                       data1 |= (1<<((12-i)*2)); // 0 -> 01
-       }
-  
+    
+    for (int i=0;i<12;i++) {
+      if (hi & (1<<(11-i)))
+        data1 |= (1<<(((11-i)*2)+1)); // 1 -> 10
+      else
+        data1 |= (1<<((11-i)*2)); // 0 -> 01
+    }
+    
        data2 = 0;
        for (int i=0;i<16;i++) {
                if (lo & (1<<(31-i)))
@@ -1132,16 +1130,16 @@ void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT)
                else
                        data2 |= (1<<((15-i)*2)); // 0 -> 01
        }
-  
+    
        data3 = 0;
        for (int i=0;i<16;i++) {
                if (lo & (1<<(15-i)))
                        data3 |= (1<<(((15-i)*2)+1)); // 1 -> 10
                else
                        data3 |= (1<<((15-i)*2)); // 0 -> 01
-       }               
+       }
   }
-
+  
        LED_D_ON();
        // Program the data blocks for supplied ID
        // and the block 0 for HID format
@@ -1154,12 +1152,12 @@ void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT)
          T55xxWriteBlock(data5,5,0,0);
          T55xxWriteBlock(data6,6,0,0);
   }
-
+  
        // Config for HID (RF/50, FSK2a, Maxblock=3 for short/6 for long)
        T55xxWriteBlock(T55x7_BITRATE_RF_50    |
-                       T55x7_MODULATION_FSK2a |
-                       last_block << T55x7_MAXBLOCK_SHIFT,
-                       0,0,0);
+                  T55x7_MODULATION_FSK2a |
+                  last_block << T55x7_MAXBLOCK_SHIFT,
+                  0,0,0);
   
        LED_D_OFF();
        
@@ -1264,7 +1262,7 @@ void CopyIndala64toT55x7(int hi, int lo)
        T55xxWriteBlock(T55x7_BITRATE_RF_32    |
                        T55x7_MODULATION_PSK1 |
                        2 << T55x7_MAXBLOCK_SHIFT,
-                       0,0,0);
+                       0, 0, 0);
        //Alternative config for Indala (Extended mode;RF/32;PSK1 with RF/2;Maxblock=2;Inverse data)
 //     T5567WriteBlock(0x603E1042,0);
 
@@ -1296,165 +1294,166 @@ void CopyIndala224toT55x7(int uid1, int uid2, int uid3, int uid4, int uid5, int
 
 }
 
+
 #define abs(x) ( ((x)<0) ? -(x) : (x) )
 #define max(x,y) ( x<y ? y:x)
 
 int DemodPCF7931(uint8_t **outBlocks) {
-  uint8_t BitStream[256];
-  uint8_t Blocks[8][16];
-  uint8_t *GraphBuffer = (uint8_t *)BigBuf;
-  int GraphTraceLen = sizeof(BigBuf);
-  int i, j, lastval, bitidx, half_switch;
-  int clock = 64;
-  int tolerance = clock / 8;
-  int pmc, block_done;
-  int lc, warnings = 0;
-  int num_blocks = 0;
-  int lmin=128, lmax=128;
-  uint8_t dir;
-
-  AcquireRawAdcSamples125k(0);
-
-  lmin = 64;
-  lmax = 192;
-
-  i = 2;
-
-  /* Find first local max/min */
-  if(GraphBuffer[1] > GraphBuffer[0]) {
+       uint8_t BitStream[256];
+       uint8_t Blocks[8][16];
+       uint8_t *GraphBuffer = (uint8_t *)BigBuf;
+       int GraphTraceLen = sizeof(BigBuf);
+       int i, j, lastval, bitidx, half_switch;
+       int clock = 64;
+       int tolerance = clock / 8;
+       int pmc, block_done;
+       int lc, warnings = 0;
+       int num_blocks = 0;
+       int lmin=128, lmax=128;
+       uint8_t dir;
+       
+       AcquireRawAdcSamples125k(0);
+       
+       lmin = 64;
+       lmax = 192;
+       
+       i = 2;
+       
+       /* Find first local max/min */
+       if(GraphBuffer[1] > GraphBuffer[0]) {
     while(i < GraphTraceLen) {
       if( !(GraphBuffer[i] > GraphBuffer[i-1]) && GraphBuffer[i] > lmax)
-       break;
+        break;
       i++;
     }
     dir = 0;
-  }
-  else {
+       }
+       else {
     while(i < GraphTraceLen) {
       if( !(GraphBuffer[i] < GraphBuffer[i-1]) && GraphBuffer[i] < lmin)
-       break;
+        break;
       i++;
     }
     dir = 1;
-  }
-  
-  lastval = i++;
-  half_switch = 0;
-  pmc = 0;
-  block_done = 0;
-  
-  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;
+       
+       lastval = i++;
+       half_switch = 0;
+       pmc = 0;
+       block_done = 0;
+       
+       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;
     }
-  memcpy(outBlocks, Blocks, 16*num_blocks);
-  return num_blocks;
+    if(bitidx==255)
+      bitidx=0;
+    warnings = 0;
+    if(num_blocks == 4) break;
+       }
+       memcpy(outBlocks, Blocks, 16*num_blocks);
+       return num_blocks;
 }
 
 int IsBlock0PCF7931(uint8_t *Block) {
-  // Assume RFU means 0 :)
-  if((memcmp(Block, "\x00\x00\x00\x00\x00\x00\x00\x01", 8) == 0) && memcmp(Block+9, "\x00\x00\x00\x00\x00\x00\x00", 7) == 0) // PAC enabled
+       // Assume RFU means 0 :)
+       if((memcmp(Block, "\x00\x00\x00\x00\x00\x00\x00\x01", 8) == 0) && memcmp(Block+9, "\x00\x00\x00\x00\x00\x00\x00", 7) == 0) // PAC enabled
     return 1;
-  if((memcmp(Block+9, "\x00\x00\x00\x00\x00\x00\x00", 7) == 0) && Block[7] == 0) // PAC disabled, can it *really* happen ?
+       if((memcmp(Block+9, "\x00\x00\x00\x00\x00\x00\x00", 7) == 0) && Block[7] == 0) // PAC disabled, can it *really* happen ?
     return 1;
-  return 0;
+       return 0;
 }
 
 int IsBlock1PCF7931(uint8_t *Block) {
-  // Assume RFU means 0 :)
-  if(Block[10] == 0 && Block[11] == 0 && Block[12] == 0 && Block[13] == 0)
+       // Assume RFU means 0 :)
+       if(Block[10] == 0 && Block[11] == 0 && Block[12] == 0 && Block[13] == 0)
     if((Block[14] & 0x7f) <= 9 && Block[15] <= 9)
       return 1;
-
-  return 0;
+       
+       return 0;
 }
 
 #define ALLOC 16
 
 void ReadPCF7931() {
-  uint8_t Blocks[8][17];
-  uint8_t tmpBlocks[4][16];
-  int i, j, ind, ind2, n;
-  int num_blocks = 0;
-  int max_blocks = 8;
-  int ident = 0;
-  int error = 0;
-  int tries = 0;
-  
-  memset(Blocks, 0, 8*17*sizeof(uint8_t));
-
-  do {
+       uint8_t Blocks[8][17];
+       uint8_t tmpBlocks[4][16];
+       int i, j, ind, ind2, n;
+       int num_blocks = 0;
+       int max_blocks = 8;
+       int ident = 0;
+       int error = 0;
+       int tries = 0;
+       
+       memset(Blocks, 0, 8*17*sizeof(uint8_t));
+       
+       do {
     memset(tmpBlocks, 0, 4*16*sizeof(uint8_t));
     n = DemodPCF7931((uint8_t**)tmpBlocks);
     if(!n)
@@ -1471,85 +1470,303 @@ void ReadPCF7931() {
     
     for(i=0; i<n; i++)
       Dbprintf("(dbg) %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
-              tmpBlocks[i][0], tmpBlocks[i][1], tmpBlocks[i][2], tmpBlocks[i][3], tmpBlocks[i][4], tmpBlocks[i][5], tmpBlocks[i][6], tmpBlocks[i][7], 
-              tmpBlocks[i][8], tmpBlocks[i][9], tmpBlocks[i][10], tmpBlocks[i][11], tmpBlocks[i][12], tmpBlocks[i][13], tmpBlocks[i][14], tmpBlocks[i][15]);
+               tmpBlocks[i][0], tmpBlocks[i][1], tmpBlocks[i][2], tmpBlocks[i][3], tmpBlocks[i][4], tmpBlocks[i][5], tmpBlocks[i][6], tmpBlocks[i][7],
+               tmpBlocks[i][8], tmpBlocks[i][9], tmpBlocks[i][10], tmpBlocks[i][11], tmpBlocks[i][12], tmpBlocks[i][13], tmpBlocks[i][14], tmpBlocks[i][15]);
     if(!ident) {
       for(i=0; i<n; i++) {
-       if(IsBlock0PCF7931(tmpBlocks[i])) {
-         // Found block 0 ?
-         if(i < n-1 && IsBlock1PCF7931(tmpBlocks[i+1])) {
-           // Found block 1!
-           // \o/
-           ident = 1;
-           memcpy(Blocks[0], tmpBlocks[i], 16);
-           Blocks[0][ALLOC] = 1;
-           memcpy(Blocks[1], tmpBlocks[i+1], 16);
-           Blocks[1][ALLOC] = 1;
-           max_blocks = max((Blocks[1][14] & 0x7f), Blocks[1][15]) + 1;
-           // Debug print
-           Dbprintf("(dbg) Max blocks: %d", max_blocks);
-           num_blocks = 2;
-           // Handle following blocks
-           for(j=i+2, ind2=2; j!=i; j++, ind2++, num_blocks++) {
-             if(j==n) j=0;
-             if(j==i) break;
-             memcpy(Blocks[ind2], tmpBlocks[j], 16);
-             Blocks[ind2][ALLOC] = 1;
-           }
-           break;
-         }
-       }
+        if(IsBlock0PCF7931(tmpBlocks[i])) {
+          // Found block 0 ?
+          if(i < n-1 && IsBlock1PCF7931(tmpBlocks[i+1])) {
+            // Found block 1!
+            // \o/
+            ident = 1;
+            memcpy(Blocks[0], tmpBlocks[i], 16);
+            Blocks[0][ALLOC] = 1;
+            memcpy(Blocks[1], tmpBlocks[i+1], 16);
+            Blocks[1][ALLOC] = 1;
+            max_blocks = max((Blocks[1][14] & 0x7f), Blocks[1][15]) + 1;
+            // Debug print
+            Dbprintf("(dbg) Max blocks: %d", max_blocks);
+            num_blocks = 2;
+            // Handle following blocks
+            for(j=i+2, ind2=2; j!=i; j++, ind2++, num_blocks++) {
+              if(j==n) j=0;
+              if(j==i) break;
+              memcpy(Blocks[ind2], tmpBlocks[j], 16);
+              Blocks[ind2][ALLOC] = 1;
+            }
+            break;
+          }
+        }
       }
     }
     else {
       for(i=0; i<n; i++) { // Look for identical block in known blocks
-       if(memcmp(tmpBlocks[i], "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16)) { // Block is not full of 00
-         for(j=0; j<max_blocks; j++) {
-           if(Blocks[j][ALLOC] == 1 && !memcmp(tmpBlocks[i], Blocks[j], 16)) {
-             // Found an identical block
-             for(ind=i-1,ind2=j-1; ind >= 0; ind--,ind2--) {
-               if(ind2 < 0)
-                 ind2 = max_blocks;
-               if(!Blocks[ind2][ALLOC]) { // Block ind2 not already found
-                 // Dbprintf("Tmp %d -> Block %d", ind, ind2);
-                 memcpy(Blocks[ind2], tmpBlocks[ind], 16);
-                 Blocks[ind2][ALLOC] = 1;
-                 num_blocks++;
-                 if(num_blocks == max_blocks) goto end;
-               }
-             }
-             for(ind=i+1,ind2=j+1; ind < n; ind++,ind2++) {
-               if(ind2 > max_blocks)
-                 ind2 = 0;
-               if(!Blocks[ind2][ALLOC]) { // Block ind2 not already found
-                 // Dbprintf("Tmp %d -> Block %d", ind, ind2);
-                 memcpy(Blocks[ind2], tmpBlocks[ind], 16);
-                 Blocks[ind2][ALLOC] = 1;
-                 num_blocks++;
-                 if(num_blocks == max_blocks) goto end;
-               }
-             }
-           }
-         }
-       }
+        if(memcmp(tmpBlocks[i], "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16)) { // Block is not full of 00
+          for(j=0; j<max_blocks; j++) {
+            if(Blocks[j][ALLOC] == 1 && !memcmp(tmpBlocks[i], Blocks[j], 16)) {
+              // Found an identical block
+              for(ind=i-1,ind2=j-1; ind >= 0; ind--,ind2--) {
+                if(ind2 < 0)
+                  ind2 = max_blocks;
+                if(!Blocks[ind2][ALLOC]) { // Block ind2 not already found
+                  // Dbprintf("Tmp %d -> Block %d", ind, ind2);
+                  memcpy(Blocks[ind2], tmpBlocks[ind], 16);
+                  Blocks[ind2][ALLOC] = 1;
+                  num_blocks++;
+                  if(num_blocks == max_blocks) goto end;
+                }
+              }
+              for(ind=i+1,ind2=j+1; ind < n; ind++,ind2++) {
+                if(ind2 > max_blocks)
+                  ind2 = 0;
+                if(!Blocks[ind2][ALLOC]) { // Block ind2 not already found
+                  // Dbprintf("Tmp %d -> Block %d", ind, ind2);
+                  memcpy(Blocks[ind2], tmpBlocks[ind], 16);
+                  Blocks[ind2][ALLOC] = 1;
+                  num_blocks++;
+                  if(num_blocks == max_blocks) goto end;
+                }
+              }
+            }
+          }
+        }
       }
     }
     tries++;
     if (BUTTON_PRESS()) return;
-  } while (num_blocks != max_blocks);
- end:
-  Dbprintf("-----------------------------------------");
-  Dbprintf("Memory content:");
-  Dbprintf("-----------------------------------------");
-  for(i=0; i<max_blocks; i++) {
+       } while (num_blocks != max_blocks);
+end:
+       Dbprintf("-----------------------------------------");
+       Dbprintf("Memory content:");
+       Dbprintf("-----------------------------------------");
+       for(i=0; i<max_blocks; i++) {
     if(Blocks[i][ALLOC]==1)
       Dbprintf("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
-              Blocks[i][0], Blocks[i][1], Blocks[i][2], Blocks[i][3], Blocks[i][4], Blocks[i][5], Blocks[i][6], Blocks[i][7], 
-              Blocks[i][8], Blocks[i][9], Blocks[i][10], Blocks[i][11], Blocks[i][12], Blocks[i][13], Blocks[i][14], Blocks[i][15]);
+               Blocks[i][0], Blocks[i][1], Blocks[i][2], Blocks[i][3], Blocks[i][4], Blocks[i][5], Blocks[i][6], Blocks[i][7],
+               Blocks[i][8], Blocks[i][9], Blocks[i][10], Blocks[i][11], Blocks[i][12], Blocks[i][13], Blocks[i][14], Blocks[i][15]);
     else
       Dbprintf("<missing block %d>", i);
+       }
+       Dbprintf("-----------------------------------------");
+       
+       return ;
+}
+
+
+//-----------------------------------
+// EM4469 / EM4305 routines
+//-----------------------------------
+#define FWD_CMD_LOGIN 0xC //including the even parity, binary mirrored
+#define FWD_CMD_WRITE 0xA
+#define FWD_CMD_READ 0x9
+#define FWD_CMD_DISABLE 0x5
+
+
+uint8_t forwardLink_data[64]; //array of forwarded bits
+uint8_t * forward_ptr; //ptr for forward message preparation
+uint8_t fwd_bit_sz; //forwardlink bit counter
+uint8_t * fwd_write_ptr; //forwardlink bit pointer
+
+//====================================================================
+// prepares command bits
+// see EM4469 spec
+//====================================================================
+//--------------------------------------------------------------------
+uint8_t Prepare_Cmd( uint8_t cmd ) {
+  //--------------------------------------------------------------------
+  
+  *forward_ptr++ = 0; //start bit
+  *forward_ptr++ = 0; //second pause for 4050 code
+  
+  *forward_ptr++ = cmd;
+  cmd >>= 1;
+  *forward_ptr++ = cmd;
+  cmd >>= 1;
+  *forward_ptr++ = cmd;
+  cmd >>= 1;
+  *forward_ptr++ = cmd;
+  
+  return 6; //return number of emited bits
+}
+
+//====================================================================
+// prepares address bits
+// see EM4469 spec
+//====================================================================
+
+//--------------------------------------------------------------------
+uint8_t Prepare_Addr( uint8_t addr ) {
+  //--------------------------------------------------------------------
+  
+  register uint8_t line_parity;
+  
+  uint8_t i;
+  line_parity = 0;
+  for(i=0;i<6;i++) {
+    *forward_ptr++ = addr;
+    line_parity ^= addr;
+    addr >>= 1;
+  }
+  
+  *forward_ptr++ = (line_parity & 1);
+  
+  return 7; //return number of emited bits
+}
+
+//====================================================================
+// prepares data bits intreleaved with parity bits
+// see EM4469 spec
+//====================================================================
+
+//--------------------------------------------------------------------
+uint8_t Prepare_Data( uint16_t data_low, uint16_t data_hi) {
+  //--------------------------------------------------------------------
+  
+  register uint8_t line_parity;
+  register uint8_t column_parity;
+  register uint8_t i, j;
+  register uint16_t data;
+  
+  data = data_low;
+  column_parity = 0;
+  
+  for(i=0; i<4; i++) {
+    line_parity = 0;
+    for(j=0; j<8; j++) {
+      line_parity ^= data;
+      column_parity ^= (data & 1) << j;
+      *forward_ptr++ = data;
+      data >>= 1;
+    }
+    *forward_ptr++ = line_parity;
+    if(i == 1)
+      data = data_hi;
+  }
+  
+  for(j=0; j<8; j++) {
+    *forward_ptr++ = column_parity;
+    column_parity >>= 1;
+  }
+  *forward_ptr = 0;
+  
+  return 45; //return number of emited bits
+}
+
+//====================================================================
+// Forward Link send function
+// Requires: forwarLink_data filled with valid bits (1 bit per byte)
+// fwd_bit_count set with number of bits to be sent
+//====================================================================
+void SendForward(uint8_t fwd_bit_count) {
+  
+  fwd_write_ptr = forwardLink_data;
+  fwd_bit_sz = fwd_bit_count;
+  
+  LED_D_ON();
+  
+  //Field on
+  FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
+  FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);
+  
+  // Give it a bit of time for the resonant antenna to settle.
+  // And for the tag to fully power up
+  SpinDelay(150);
+  
+  // force 1st mod pulse (start gap must be longer for 4305)
+  fwd_bit_sz--; //prepare next bit modulation
+  fwd_write_ptr++;
+  FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
+  SpinDelayUs(55*8); //55 cycles off (8us each)for 4305
+  FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
+  FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);//field on
+  SpinDelayUs(16*8); //16 cycles on (8us each)
+  
+  // now start writting
+  while(fwd_bit_sz-- > 0) { //prepare next bit modulation
+    if(((*fwd_write_ptr++) & 1) == 1)
+      SpinDelayUs(32*8); //32 cycles at 125Khz (8us each)
+    else {
+      //These timings work for 4469/4269/4305 (with the 55*8 above)
+      FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
+      SpinDelayUs(23*8); //16-4 cycles off (8us each)
+      FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz
+      FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);//field on
+      SpinDelayUs(9*8); //16 cycles on (8us each)
+    }
+  }
+}
+
+void EM4xLogin(uint32_t Password) {
+  
+  uint8_t fwd_bit_count;
+  
+  forward_ptr = forwardLink_data;
+  fwd_bit_count = Prepare_Cmd( FWD_CMD_LOGIN );
+  fwd_bit_count += Prepare_Data( Password&0xFFFF, Password>>16 );
+  
+  SendForward(fwd_bit_count);
+  
+  //Wait for command to complete
+  SpinDelay(20);
+  
+}
+
+void EM4xReadWord(uint8_t Address, uint32_t Pwd, uint8_t PwdMode) {
+  
+  uint8_t fwd_bit_count;
+  uint8_t *dest = (uint8_t *)BigBuf;
+  int m=0, i=0;
+  
+  //If password mode do login
+  if (PwdMode == 1) EM4xLogin(Pwd);
+  
+  forward_ptr = forwardLink_data;
+  fwd_bit_count = Prepare_Cmd( FWD_CMD_READ );
+  fwd_bit_count += Prepare_Addr( Address );
+  
+  m = sizeof(BigBuf);
+  // Clear destination buffer before sending the command
+  memset(dest, 128, m);
+  // Connect the A/D to the peak-detected low-frequency path.
+  SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
+  // Now set up the SSC to get the ADC samples that are now streaming at us.
+  FpgaSetupSsc();
+  
+  SendForward(fwd_bit_count);
+  
+  // Now do the acquisition
+  i = 0;
+  for(;;) {
+    if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
+      AT91C_BASE_SSC->SSC_THR = 0x43;
+    }
+    if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
+      dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+      i++;
+      if (i >= m) break;
+    }
   }
-  Dbprintf("-----------------------------------------");
+  FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
+  LED_D_OFF();
+}
+
+void EM4xWriteWord(uint32_t Data, uint8_t Address, uint32_t Pwd, uint8_t PwdMode) {
   
-  return ;
+  uint8_t fwd_bit_count;
+  
+  //If password mode do login
+  if (PwdMode == 1) EM4xLogin(Pwd);
+  
+  forward_ptr = forwardLink_data;
+  fwd_bit_count = Prepare_Cmd( FWD_CMD_WRITE );
+  fwd_bit_count += Prepare_Addr( Address );
+  fwd_bit_count += Prepare_Data( Data&0xFFFF, Data>>16 );
+  
+  SendForward(fwd_bit_count);
+  
+  //Wait for write to complete
+  SpinDelay(20);
+  FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
+  LED_D_OFF();
 }
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