CHG: reordered the "hf search" internal checks. The iclass check takes 4.5sec to...

[proxmark3-svn] / armsrc / legicrf.c

diff --git a/armsrc/legicrf.c b/armsrc/legicrf.c
index 19f12a95bc5817e6ce227c8fc682e8ffa1796fd6..f9092103ea1f0b1a70037731ba64fd81b2b0f3d3 100644 (file)
--- a/armsrc/legicrf.c
+++ b/armsrc/legicrf.c
@@ -91,7 +91,9 @@ static void setup_timer(void) {
 #ifndef OPEN_COIL
 # define OPEN_COIL     HIGH(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
 // Pause pulse,  off in 20us / 30ticks,
 // ONE / ZERO bit pulse,  
 //    one == 80us / 120ticks


@@ -161,10 +163,6 @@ uint32_t get_key_stream(int skip, int count) {
 
        i = (count == 6) ? -1 : legic_read_count;
 
 
        i = (count == 6) ? -1 : legic_read_count;
 

-       // log
-       //uint8_t cmdbytes[] = {bits,   BYTEx(data, 0), BYTEx(data, 1), BYTEx(send, 0), BYTEx(send, 1), legic_prng_count()};
-       //LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, TRUE);
-

        /* Generate KeyStream */
        return legic_prng_get_bits(count);
 }
        /* Generate KeyStream */
        return legic_prng_get_bits(count);
 }


@@ -203,8 +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);


@@ -220,7 +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);
 }
 


@@ -255,9 +252,6 @@ static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits) {
        volatile uint32_t level = 0;
        
        frame_clean(f);
        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);
        
        // calibrate the prng.
        legic_prng_forward(2);


@@ -346,10 +340,11 @@ static void LegicCommonInit(void) {
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
        /* Bitbang the transmitter */
        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();
        memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE);
        // reserve a cardmem,  meaning we can use the tracelog function in bigbuff easier.
        cardmem = BigBuf_get_EM_addr();
        memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE);


@@ -363,7 +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();
 }


@@ -394,7 +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;
        }
 


@@ -407,65 +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);

+       
+       LINE_IN;

 
 

-       // wait for ack
-       AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
-       AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
-
-    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) {


@@ -481,13 +477,9 @@ int LegicRfReader(uint16_t offset, uint16_t len, uint8_t iv) {
                goto OUT;
        }
 
                goto OUT;
        }
 

-       switch_off_tag_rwd();
-

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


@@ -511,16 +503,16 @@ 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) {
 

+       #define LOWERLIMIT 4

        uint8_t isOK = 1;
        uint8_t isOK = 1;

+       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();
        
        if ( legic_select_card_iv(&card, iv) ) {
        LegicCommonInit();
        
        if ( legic_select_card_iv(&card, iv) ) {


@@ -528,42 +520,21 @@ void LegicRfWriter(uint16_t offset, uint16_t len, uint8_t iv, uint8_t *data) {
                goto OUT;
        }
        
                goto OUT;
        }
        

-       if (len + offset >= card.cardsize)
-               len = card.cardsize - offset;
-
-       setup_phase_reader(iv);
+       if ( len + offset + LOWERLIMIT >= card.cardsize) {
+               isOK = 0;
+               goto OUT;
+       }

 
     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( cardmem[index], index , card.addrsize);
-               --index;
-       end loop        
-       */
-       uint16_t index = len;
-       while(index > 4) {
-
-               r = legic_write_byte( index, cardmem[ 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:
        cmd_send(CMD_ACK, isOK, 0,0,0,0);
        switch_off_tag_rwd();
 OUT:
        cmd_send(CMD_ACK, isOK, 0,0,0,0);
        switch_off_tag_rwd();


@@ -681,7 +652,11 @@ OUT:
  */
 static void frame_handle_tag(struct legic_frame const * const f)
 {
  */
 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) {


@@ -691,8 +666,12 @@ static void frame_handle_tag(struct legic_frame const * const f)
                // Reset prng timer
                ResetTimer(prng_timer);
 
                // Reset prng timer
                ResetTimer(prng_timer);
 

+               // IV from reader.

                legic_prng_init(f->data);
                legic_prng_init(f->data);

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

                frame_send_tag(0x3d, 6); /* 0x3d^0x26 = 0x1B */
                frame_send_tag(0x3d, 6); /* 0x3d^0x26 = 0x1B */

+               

                legic_state = STATE_IV;
                legic_read_count = 0;
                legic_prng_bc = 0;
                legic_state = STATE_IV;
                legic_read_count = 0;
                legic_prng_bc = 0;


@@ -706,7 +685,7 @@ static void frame_handle_tag(struct legic_frame const * const f)
 
    /* 0x19==??? */
    if(legic_state == STATE_IV) {
 
    /* 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;
       int xored = 0x39 ^ local_key;
       if((f->bits == 6) && (f->data == xored)) {
          legic_state = STATE_CON;


@@ -726,59 +705,47 @@ static void frame_handle_tag(struct legic_frame const * const f)
    /* Read */
    if(f->bits == 11) {
       if(legic_state == STATE_CON) {
    /* 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;
          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);
          legic_prng_forward(legic_reqresp_drift);
 
          frame_send_tag(hash | data, 12);

-

                 ResetTimer(timer);
          legic_prng_forward(2);
                 ResetTimer(timer);
          legic_prng_forward(2);

-                WaitUS(180);
+                WaitTicks(330);

          return;
       }
    }
 
    /* Write */
    if(f->bits == 23) {
          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);
       /* 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);
       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);
       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);
    legic_state = STATE_DISCON; 
    legic_read_count = 0;
    SpinDelay(10);


@@ -822,6 +789,9 @@ 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.
    */
    * 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;
 
        legic_phase_drift = phase;
        legic_frame_drift = frame;


@@ -829,30 +799,36 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
 
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
 
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);

-       FpgaSetupSsc();

        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_212K);
 
        /* Bitbang the receiver */
        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);
 
        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()) {
 
        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 */
                                
                                if (FUZZ_EQUAL(time, RWD_TIME_1, RWD_TIME_FUZZ)) {
                                        /* 1 bit */


@@ -880,15 +856,22 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
                        LED_A_OFF();
                }
 
                        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();
        }
 
                old_level = level;
                WDT_HIT();
        }

-       if ( MF_DBGLEVEL >= 1) DbpString("Stopped");
+
+       WDT_HIT();
+       switch_off_tag_rwd();

        LEDsoff();
        LEDsoff();

+       cmd_send(CMD_ACK, 1, 0, 0, 0, 0);

 }
 
 //-----------------------------------------------------------------------------
 }
 
 //-----------------------------------------------------------------------------