CHG: extern methods.

[proxmark3-svn] / armsrc / lfops.c

diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index 0dc5bcf9cee1f95e34ece58662971fbca7b02942..ffeb8ea12e76c2a6fec0019d61608b6da55ef179 100644 (file)
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -43,7 +43,7 @@ void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t periods, uint3
        uint16_t period_0 =  periods >> 16;
        uint16_t period_1 =  periods & 0xFFFF;
        
        uint16_t period_0 =  periods >> 16;
        uint16_t period_1 =  periods & 0xFFFF;
        

-       // 95 == 125 KHz  88 == 124.8 KHz
+       // 95 == 125 KHz  88 == 134.8 KHz

        int divisor_used = (useHighFreq) ? 88 : 95;
        sample_config sc = { 0,0,1, divisor_used, 0};
        setSamplingConfig(&sc);
        int divisor_used = (useHighFreq) ? 88 : 95;
        sample_config sc = { 0,0,1, divisor_used, 0};
        setSamplingConfig(&sc);


@@ -326,7 +326,6 @@ void AcquireTiType(void)
 // if not provided a valid crc will be computed from the data and written.
 void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc)
 {
 // if not provided a valid crc will be computed from the data and written.
 void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc)
 {

-       StartTicks();

        FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        if(crc == 0) {
                crc = update_crc16(crc, (idlo)&0xff);
        FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
        if(crc == 0) {
                crc = update_crc16(crc, (idlo)&0xff);


@@ -347,8 +346,10 @@ void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc)
        // whether we're modulating the antenna (high)
        // or listening to the antenna (low)
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU);
        // whether we're modulating the antenna (high)
        // or listening to the antenna (low)
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU);

+       StartTicks();
+       

        LED_A_ON();
        LED_A_ON();

-
+       

        // steal this pin from the SSP and use it to control the modulation
        AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
        AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
        // steal this pin from the SSP and use it to control the modulation
        AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
        AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;


@@ -361,7 +362,7 @@ void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc)
        // then write 80 bits of data (or 64 bit data + 16 bit crc if you prefer)
        // finally end with 0x0300 (write frame)
        // all data is sent lsb first
        // then write 80 bits of data (or 64 bit data + 16 bit crc if you prefer)
        // finally end with 0x0300 (write frame)
        // all data is sent lsb first

-       // finish with 15ms programming time
+       // finish with 50ms programming time

 
        // modulate antenna
        HIGH(GPIO_SSC_DOUT);
 
        // modulate antenna
        HIGH(GPIO_SSC_DOUT);


@@ -399,7 +400,8 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol)
        int i = 0;
        uint8_t *buf = BigBuf_get_addr();
 
        int i = 0;
        uint8_t *buf = BigBuf_get_addr();
 

-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU);
+       //FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);

        //FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD);
        //FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_TOGGLE_MODE );
 
        //FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_READER_FIELD);
        //FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT | FPGA_LF_EDGE_DETECT_TOGGLE_MODE );
 


@@ -420,8 +422,9 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol)
        AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_CLK;
 
        // power on antenna
        AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_CLK;
 
        // power on antenna

-       // OPEN_COIL();
-       // SpinDelay(50);
+       OPEN_COIL();
+       // charge time
+       WaitMS(50);

                
        for(;;) {
                WDT_HIT();
                
        for(;;) {
                WDT_HIT();


@@ -710,7 +713,7 @@ void CmdASKsimTag(uint16_t arg1, uint16_t arg2, size_t size, uint8_t *BitStream)
                for (i=0; i<size; i++){
                        askSimBit(BitStream[i]^invert, &n, clk, encoding);
                }
                for (i=0; i<size; i++){
                        askSimBit(BitStream[i]^invert, &n, clk, encoding);
                }

-               if (encoding==0 && BitStream[0]==BitStream[size-1]){ //run a second set inverted (for biphase phase)
+               if (encoding==0 && BitStream[0]==BitStream[size-1]){ //run a second set inverted (for ask/raw || biphase phase)

                        for (i=0; i<size; i++){
                                askSimBit(BitStream[i]^invert^1, &n, clk, encoding);
                        }
                        for (i=0; i<size; i++){
                                askSimBit(BitStream[i]^invert^1, &n, clk, encoding);
                        }


@@ -799,7 +802,7 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)
                WDT_HIT();
                if (ledcontrol) LED_A_ON();
 
                WDT_HIT();
                if (ledcontrol) LED_A_ON();
 

-               DoAcquisition_default(-1,true);
+               DoAcquisition_default(0, true);

                // FSK demodulator
                size = 50*128*2; //big enough to catch 2 sequences of largest format
                idx = HIDdemodFSK(dest, &size, &hi2, &hi, &lo);
                // FSK demodulator
                size = 50*128*2; //big enough to catch 2 sequences of largest format
                idx = HIDdemodFSK(dest, &size, &hi2, &hi, &lo);


@@ -1012,7 +1015,7 @@ void CmdEM410xdemod(int findone, int *high, int *low, int ledcontrol)
        
                        errCnt = Em410xDecode(dest, &size, &idx, &hi, &lo);
                        if (errCnt){
        
                        errCnt = Em410xDecode(dest, &size, &idx, &hi, &lo);
                        if (errCnt){

-                               if (size>64){
+                               if (size == 128){

                                        Dbprintf("EM XL TAG ID: %06x%08x%08x - (%05d_%03d_%08d)",
                                          hi,
                                          (uint32_t)(lo>>32),
                                        Dbprintf("EM XL TAG ID: %06x%08x%08x - (%05d_%03d_%08d)",
                                          hi,
                                          (uint32_t)(lo>>32),


@@ -1176,6 +1179,10 @@ void TurnReadLFOn(uint32_t delay) {
        // Give it a bit of time for the resonant antenna to settle.
        WaitUS(delay);
 }
        // Give it a bit of time for the resonant antenna to settle.
        WaitUS(delay);
 }

+void TurnReadLF_off(uint32_t delay) {
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       WaitUS(delay);
+}

 
 // Write one bit to card
 void T55xxWriteBit(int bit) {
 
 // Write one bit to card
 void T55xxWriteBit(int bit) {


@@ -1388,7 +1395,7 @@ void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT) {
        data[0] = T55x7_BITRATE_RF_50 | T55x7_MODULATION_FSK2a | last_block << T55x7_MAXBLOCK_SHIFT;
 
        //TODO add selection of chip for Q5 or T55x7
        data[0] = T55x7_BITRATE_RF_50 | T55x7_MODULATION_FSK2a | last_block << T55x7_MAXBLOCK_SHIFT;
 
        //TODO add selection of chip for Q5 or T55x7

-       // data[0] = (((50-2)/2)<<T5555_BITRATE_SHIFT) | T5555_MODULATION_FSK2 | T5555_INVERT_OUTPUT | last_block << T5555_MAXBLOCK_SHIFT;
+       // data[0] = (((50-2)>>1)<<T5555_BITRATE_SHIFT) | T5555_MODULATION_FSK2 | T5555_INVERT_OUTPUT | last_block << T5555_MAXBLOCK_SHIFT;

 
        LED_D_ON();
        WriteT55xx(data, 0, last_block+1);
 
        LED_D_ON();
        WriteT55xx(data, 0, last_block+1);


@@ -1399,7 +1406,7 @@ void CopyIOtoT55x7(uint32_t hi, uint32_t lo) {
        uint32_t data[] = {T55x7_BITRATE_RF_64 | T55x7_MODULATION_FSK2a | (2 << T55x7_MAXBLOCK_SHIFT), hi, lo};
        //TODO add selection of chip for Q5 or T55x7
        //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
        uint32_t data[] = {T55x7_BITRATE_RF_64 | T55x7_MODULATION_FSK2a | (2 << T55x7_MAXBLOCK_SHIFT), hi, lo};
        //TODO add selection of chip for Q5 or T55x7
        //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)

-       // data[0] = (64 << T5555_BITRATE_SHIFT) | T5555_MODULATION_FSK2 | T5555_INVERT_OUTPUT | 2 << T5555_MAXBLOCK_SHIFT;
+       // data[0] = ( ((64-2)>>1) << T5555_BITRATE_SHIFT) | T5555_MODULATION_FSK2 | T5555_INVERT_OUTPUT | 2 << T5555_MAXBLOCK_SHIFT;

 
        LED_D_ON();
        // Program the data blocks for supplied ID
 
        LED_D_ON();
        // Program the data blocks for supplied ID


@@ -1414,7 +1421,7 @@ void CopyIndala64toT55x7(uint32_t hi, uint32_t lo) {
        // and the Config for Indala 64 format (RF/32;PSK1 with RF/2;Maxblock=2)
        uint32_t data[] = { T55x7_BITRATE_RF_32 | T55x7_MODULATION_PSK1 | (2 << T55x7_MAXBLOCK_SHIFT), hi, lo};
        //TODO add selection of chip for Q5 or T55x7
        // and the Config for Indala 64 format (RF/32;PSK1 with RF/2;Maxblock=2)
        uint32_t data[] = { T55x7_BITRATE_RF_32 | T55x7_MODULATION_PSK1 | (2 << T55x7_MAXBLOCK_SHIFT), hi, lo};
        //TODO add selection of chip for Q5 or T55x7

-       // data[0] = (((32-2)/2)<<T5555_BITRATE_SHIFT) | T5555_MODULATION_PSK1 | 2 << T5555_MAXBLOCK_SHIFT;
+       // data[0] = (((32-2)>>1)<<T5555_BITRATE_SHIFT) | T5555_MODULATION_PSK1 | 2 << T5555_MAXBLOCK_SHIFT;

 
        WriteT55xx(data, 0, 3);
        //Alternative config for Indala (Extended mode;RF/32;PSK1 with RF/2;Maxblock=2;Inverse data)
 
        WriteT55xx(data, 0, 3);
        //Alternative config for Indala (Extended mode;RF/32;PSK1 with RF/2;Maxblock=2;Inverse data)


@@ -1428,7 +1435,7 @@ void CopyIndala224toT55x7(uint32_t uid1, uint32_t uid2, uint32_t uid3, uint32_t
        //Config for Indala (RF/32;PSK1 with RF/2;Maxblock=7)
        data[0] = T55x7_BITRATE_RF_32 | T55x7_MODULATION_PSK1 | (7 << T55x7_MAXBLOCK_SHIFT);
        //TODO add selection of chip for Q5 or T55x7
        //Config for Indala (RF/32;PSK1 with RF/2;Maxblock=7)
        data[0] = T55x7_BITRATE_RF_32 | T55x7_MODULATION_PSK1 | (7 << T55x7_MAXBLOCK_SHIFT);
        //TODO add selection of chip for Q5 or T55x7

-       // data[0] = (((32-2)/2)<<T5555_BITRATE_SHIFT) | T5555_MODULATION_PSK1 | 7 << T5555_MAXBLOCK_SHIFT;
+       // data[0] = (((32-2)>>1) << T5555_BITRATE_SHIFT) | T5555_MODULATION_PSK1 | 7 << T5555_MAXBLOCK_SHIFT;

        WriteT55xx(data, 0, 8);
        //Alternative config for Indala (Extended mode;RF/32;PSK1 with RF/2;Maxblock=7;Inverse data)
        //      T5567WriteBlock(0x603E10E2,0);
        WriteT55xx(data, 0, 8);
        //Alternative config for Indala (Extended mode;RF/32;PSK1 with RF/2;Maxblock=7;Inverse data)
        //      T5567WriteBlock(0x603E10E2,0);


@@ -1437,7 +1444,7 @@ void CopyIndala224toT55x7(uint32_t uid1, uint32_t uid2, uint32_t uid3, uint32_t
 void CopyVikingtoT55xx(uint32_t block1, uint32_t block2, uint8_t Q5) {
        uint32_t data[] = {T55x7_BITRATE_RF_32 | T55x7_MODULATION_MANCHESTER | (2 << T55x7_MAXBLOCK_SHIFT), block1, block2};
        //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
 void CopyVikingtoT55xx(uint32_t block1, uint32_t block2, uint8_t Q5) {
        uint32_t data[] = {T55x7_BITRATE_RF_32 | T55x7_MODULATION_MANCHESTER | (2 << T55x7_MAXBLOCK_SHIFT), block1, block2};
        //t5555 (Q5) BITRATE = (RF-2)/2 (iceman)

-       if (Q5) data[0] = (32 << T5555_BITRATE_SHIFT) | T5555_MODULATION_MANCHESTER | 2 << T5555_MAXBLOCK_SHIFT;
+       if (Q5) data[0] = (((32-2)>>1) << T5555_BITRATE_SHIFT) | T5555_MODULATION_MANCHESTER | 2 << T5555_MAXBLOCK_SHIFT;

        // Program the data blocks for supplied ID and the block 0 config
        WriteT55xx(data, 0, 3);
        LED_D_OFF();
        // Program the data blocks for supplied ID and the block 0 config
        WriteT55xx(data, 0, 3);
        LED_D_OFF();


@@ -1521,8 +1528,8 @@ void WriteEM410x(uint32_t card, uint32_t id_hi, uint32_t id_lo) {
                }
                data[0] = clock | T55x7_MODULATION_MANCHESTER | (2 << T55x7_MAXBLOCK_SHIFT);
        } else { //t5555 (Q5)
                }
                data[0] = clock | T55x7_MODULATION_MANCHESTER | (2 << T55x7_MAXBLOCK_SHIFT);
        } else { //t5555 (Q5)

-               clock = (clock-2)>>1;  //n = (RF-2)/2
-               data[0] = (clock << T5555_BITRATE_SHIFT) | T5555_MODULATION_MANCHESTER | (2 << T5555_MAXBLOCK_SHIFT);
+               // t5555 (Q5) BITRATE = (RF-2)/2 (iceman)
+               data[0] = ( ((clock-2) >> 1) << T5555_BITRATE_SHIFT) | T5555_MODULATION_MANCHESTER | (2 << T5555_MAXBLOCK_SHIFT);

        }
  
        WriteT55xx(data, 0, 3);
        }
  
        WriteT55xx(data, 0, 3);


@@ -1537,7 +1544,9 @@ void WriteEM410x(uint32_t card, uint32_t id_hi, uint32_t id_lo) {
 //-----------------------------------
 // EM4469 / EM4305 routines
 //-----------------------------------
 //-----------------------------------
 // EM4469 / EM4305 routines
 //-----------------------------------

-#define FWD_CMD_LOGIN   0xC //including the even parity, binary mirrored
+// Below given command set. 
+// Commands are including the even parity, binary mirrored
+#define FWD_CMD_LOGIN   0xC 

 #define FWD_CMD_WRITE   0xA
 #define FWD_CMD_READ    0x9
 #define FWD_CMD_DISABLE 0x5
 #define FWD_CMD_WRITE   0xA
 #define FWD_CMD_READ    0x9
 #define FWD_CMD_DISABLE 0x5


@@ -1586,7 +1595,7 @@ uint8_t Prepare_Addr( uint8_t addr ) {
 
        uint8_t i;
        line_parity = 0;
 
        uint8_t i;
        line_parity = 0;

-       for(i=0;i<6;i++) {
+       for( i=0; i<6; i++ ) {

                *forward_ptr++ = addr;
                line_parity ^= addr;
                addr >>= 1;
                *forward_ptr++ = addr;
                line_parity ^= addr;
                addr >>= 1;


@@ -1640,117 +1649,150 @@ uint8_t Prepare_Data( uint16_t data_low, uint16_t data_hi) {
 //====================================================================
 void SendForward(uint8_t fwd_bit_count) {
 
 //====================================================================
 void SendForward(uint8_t fwd_bit_count) {
 

+// iceman,   21.3us increments for the USclock verification.
+// 55FC * 8us == 440us / 21.3 === 20.65 steps.  could be too short. Go for 56FC instead
+// 32FC * 8us == 256us / 21.3 ==  12.018 steps. ok
+// 16FC * 8us == 128us / 21.3 ==  6.009 steps. ok 
+#ifndef EM_START_GAP
+#define EM_START_GAP 55*8
+#endif
+

        fwd_write_ptr = forwardLink_data;
        fwd_bit_sz = fwd_bit_count;
 
        fwd_write_ptr = forwardLink_data;
        fwd_bit_sz = fwd_bit_count;
 

-       LED_D_ON();
-

        // Set up FPGA, 125kHz
        LFSetupFPGAForADC(95, true);
        
        // force 1st mod pulse (start gap must be longer for 4305)
        fwd_bit_sz--; //prepare next bit modulation
        fwd_write_ptr++;
        // Set up FPGA, 125kHz
        LFSetupFPGAForADC(95, true);
        
        // 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
-       WaitUS(55*8); //55 cycles off (8us each)for 4305        // ICEMAN:  problem with (us) clock is  21.3us increments
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);//field on
-       WaitUS(16*8); //16 cycles on (8us each) // ICEMAN:  problem with (us) clock is  21.3us increments
+       
+       TurnReadLF_off(EM_START_GAP);
+       TurnReadLFOn(18*8);

 
 

-       // now start writting
+       // now start writting with bitbanging the antenna.

        while(fwd_bit_sz-- > 0) { //prepare next bit modulation
        while(fwd_bit_sz-- > 0) { //prepare next bit modulation

-               if(((*fwd_write_ptr++) & 1) == 1)
-                       WaitUS(32*8); //32 cycles at 125Khz (8us each)  // ICEMAN:  problem with (us) clock is  21.3us increments
-               else {
-                       //These timings work for 4469/4269/4305 (with the 55*8 above)
-                       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
-                       WaitUS(16*8); //16-4 cycles off (8us each)      // ICEMAN:  problem with (us) clock is  21.3us increments
-                       FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);//field on
-                       WaitUS(16*8); //16 cycles on (8us each) // ICEMAN:  problem with (us) clock is  21.3us increments
+               if(((*fwd_write_ptr++) & 1) == 1) {
+                       WaitUS(32);
+               } else {
+                       TurnReadLF_off(23*8);
+                       TurnReadLFOn(16*8);

                }
        }
 }
 
                }
        }
 }
 

-void EM4xLogin(uint32_t Password) {
-
-       uint8_t fwd_bit_count;
+void EM4xLogin(uint32_t pwd) {
+       uint8_t len;

        forward_ptr = forwardLink_data;
        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
-       WaitMS(20);
+       len = Prepare_Cmd( FWD_CMD_LOGIN );
+       len += Prepare_Data( pwd & 0xFFFF, pwd >> 16 );
+       SendForward(len);
+       //WaitUS(20); // no wait for login command.
+       // should receive
+       // 0000 1010 ok.
+       // 0000 0001 fail

 }
 
 }
 

-void EM4xReadWord(uint8_t Address, uint32_t Pwd, uint8_t PwdMode) {
+void EM4xReadWord(uint8_t addr, uint32_t pwd, uint8_t usepwd) {

 
 

-       uint8_t fwd_bit_count;
-       uint8_t *dest = BigBuf_get_addr();
-       uint16_t bufsize = BigBuf_max_traceLen();  // ICEMAN: this tries to fill up all tracelog space
-       uint32_t i = 0;
-
-       // Clear destination buffer before sending the command
+       LED_A_ON();
+       uint8_t len;
+       
+       //clear buffer now so it does not interfere with timing later

        BigBuf_Clear_ext(false);
        
        BigBuf_Clear_ext(false);
        

-       //If password mode do login
-       if (PwdMode == 1) EM4xLogin(Pwd);
+       /* should we read answer from Logincommand?
+       *
+       * should receive
+       * 0000 1010 ok.
+       * 0000 0001 fail
+       **/
+       if (usepwd) EM4xLogin(pwd);

 
        forward_ptr = forwardLink_data;
 
        forward_ptr = forwardLink_data;

-       fwd_bit_count = Prepare_Cmd( FWD_CMD_READ );
-       fwd_bit_count += Prepare_Addr( Address );
+       len = Prepare_Cmd( FWD_CMD_READ );
+       len += Prepare_Addr( addr );

 
 

-       SendForward(fwd_bit_count);
+       SendForward(len);

 
 

-       // Now do the acquisition
-       // ICEMAN, change to the one in lfsampling.c
-       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 >= bufsize) break;
-               }
-       }
+       WaitUS(400);
+
+       DoPartialAcquisition(20, true, 6000);

 
 

-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off    
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

        cmd_send(CMD_ACK,0,0,0,0,0);
        cmd_send(CMD_ACK,0,0,0,0,0);

-       LED_D_OFF();
+       LED_A_OFF();

 }
 
 }
 

-void EM4xWriteWord(uint32_t Data, uint8_t Address, uint32_t Pwd, uint8_t PwdMode) {
+void EM4xWriteWord(uint32_t flag, uint32_t data, uint32_t pwd) {

 
 

-       uint8_t fwd_bit_count;
+       LED_A_ON();
+       
+       bool usePwd = (flag & 0xF);
+       uint8_t addr = (flag >> 8) & 0xFF;
+       uint8_t len;
+       
+       //clear buffer now so it does not interfere with timing later
+       BigBuf_Clear_ext(false);

 
 

-       //If password mode do login
-       if (PwdMode == 1) EM4xLogin(Pwd);
+       /* should we read answer from Logincommand?
+       *
+       * should receive
+       * 0000 1010 ok.
+       * 0000 0001 fail
+       **/     
+       if (usePwd) EM4xLogin(pwd);

 
        forward_ptr = forwardLink_data;
 
        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 );
+       len = Prepare_Cmd( FWD_CMD_WRITE );
+       len += Prepare_Addr( addr );
+       len += Prepare_Data( data & 0xFFFF, data >> 16 );

 
 

-       SendForward(fwd_bit_count);
+       SendForward(len);

 
 

-       //Wait for write to complete
-       WaitMS(20);
-       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
-       LED_D_OFF();
+       //Wait 20ms for write to complete?
+       WaitMS(7);
+
+       //Capture response if one exists
+       DoPartialAcquisition(20, true, 6000);
+       
+       FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+       cmd_send(CMD_ACK,0,0,0,0,0);
+       LED_A_OFF();

 }
 
 }
 

-void Cotag() {
+/*
+Reading a COTAG.

 
 

-//#define WAIT2200     { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); WaitUS(2035); }
-#define WAIT2200       { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); WaitUS(2200); }
-       LED_A_ON();
+COTAG needs the reader to send a startsequence and the card has an extreme slow datarate.
+because of this, we can "sample" the data signal but we interpreate it to Manchester direct.
+
+READER START SEQUENCE:
+burst 800 us,    gap   2.2 msecs
+burst 3.6 msecs  gap   2.2 msecs
+burst 800 us     gap   2.2 msecs
+pulse 3.6 msecs
+
+This triggers a COTAG tag to response
+*/
+void Cotag(uint32_t arg0) {
+#ifndef OFF
+# define OFF   { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); WaitUS(2035); }
+#endif
+#ifndef ON
+# define ON(x)   { FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); WaitUS((x)); }
+#endif
+       uint8_t rawsignal = arg0 & 0xF;
+
+       LED_A_ON();     
+
+       // Switching to LF image on FPGA. This might empty BigBuff
+       FpgaDownloadAndGo(FPGA_BITSTREAM_LF);

        
        //clear buffer now so it does not interfere with timing later
        BigBuf_Clear_ext(false);
        
        //clear buffer now so it does not interfere with timing later
        BigBuf_Clear_ext(false);

-
-       // Set up FPGA, 132kHz to power up the tag
-       FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
+       
+       // Set up FPGA, 132kHz to power up the tag      

        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 89);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
 
        FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 89);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);
 


@@ -1760,33 +1802,27 @@ void Cotag() {
        // Now set up the SSC to get the ADC samples that are now streaming at us.
        FpgaSetupSsc();
 
        // Now set up the SSC to get the ADC samples that are now streaming at us.
        FpgaSetupSsc();
 

-       // start a 1.5ticks is 1us
+       // start clock - 1.5ticks is 1us

        StartTicks();
        
        StartTicks();
        

-       //send start pulse
-       TurnReadLFOn(800);      WAIT2200
-       TurnReadLFOn(3600);     WAIT2200
-       TurnReadLFOn(800);      WAIT2200
-       TurnReadLFOn(3600);     
-       
-/*
-       TurnReadLFOn(740);      WAIT2200
-       TurnReadLFOn(3330);     WAIT2200
-       TurnReadLFOn(740);      WAIT2200
-       TurnReadLFOn(3330);     
-       
-
-burst 800 us,    gap   2.2 msecs
-burst 3.6 msecs  gap   2.2 msecs
-burst 800 us     gap   2.2 msecs
-pulse 3.6 msecs
-*/
-       
-       // Acquisition
-       DoAcquisition_default(-1, true);
+       //send COTAG start pulse
+       ON(740)  OFF
+       ON(3330) OFF
+       ON(740)  OFF
+       ON(1000)
+
+       switch(rawsignal) {
+               case 0: doCotagAcquisition(50000); break;
+               case 1: doCotagAcquisitionManchester(); break;
+               case 2: DoAcquisition_config(TRUE); break;
+       }

        
        // Turn the field off
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
        cmd_send(CMD_ACK,0,0,0,0,0);    
        LED_A_OFF();
 }
        
        // Turn the field off
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off
        cmd_send(CMD_ACK,0,0,0,0,0);    
        LED_A_OFF();
 }

+
+/*
+* EM4305 support
+*/