CHG; added an option wither or not to clear emulator mem on init

[proxmark3-svn] / armsrc / legicrf.c

diff --git a/armsrc/legicrf.c b/armsrc/legicrf.c
index 9abc77612c71fe09333a0c32fc4c2abf99e0f2a8..a1b96b9ae7c5d142e641105ec062ccde8c049cac 100644 (file)
--- a/armsrc/legicrf.c
+++ b/armsrc/legicrf.c
@@ -180,7 +180,7 @@ void frame_send_tag(uint16_t response, uint8_t bits) {
        AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
 
         /* TAG_FRAME_WAIT -> shift by 2 */
-       legic_prng_forward(2);
+       legic_prng_forward(3);
        response ^= legic_prng_get_bits(bits);
 
        /* Wait for the frame start */
@@ -333,7 +333,7 @@ static uint32_t setup_phase_reader(uint8_t iv) {
        return current_frame.data;
 }
 
-static void LegicCommonInit(void) {
+void LegicCommonInit(bool clear_mem) {
 
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
@@ -347,7 +347,8 @@ static void LegicCommonInit(void) {
        
        // reserve a cardmem,  meaning we can use the tracelog function in bigbuff easier.
        cardmem = BigBuf_get_EM_addr();
-       memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE);
+       if ( clear_mem )
+               memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE);
 
        clear_trace();
        set_tracing(TRUE);
@@ -470,7 +471,7 @@ int LegicRfReader(uint16_t offset, uint16_t len, uint8_t iv) {
        uint8_t isOK = 1;
        legic_card_select_t card;
        
-       LegicCommonInit();
+       LegicCommonInit(TRUE);
        
        if ( legic_select_card_iv(&card, iv) ) {
                isOK = 0;
@@ -513,7 +514,7 @@ void LegicRfWriter(uint16_t offset, uint16_t len, uint8_t iv, uint8_t *data) {
                goto OUT;
        }
        
-       LegicCommonInit();
+       LegicCommonInit(TRUE);
        
        if ( legic_select_card_iv(&card, iv) ) {
                isOK = 0;
@@ -613,7 +614,7 @@ void LegicRfInfo(void){
        uint8_t buf[sizeof(legic_card_select_t)] = {0x00};
        legic_card_select_t *card = (legic_card_select_t*) buf;
        
-       LegicCommonInit();
+       LegicCommonInit(FALSE);
 
        if ( legic_select_card(card) ) {
                cmd_send(CMD_ACK,0,0,0,0,0);
@@ -654,31 +655,35 @@ static void frame_handle_tag(struct legic_frame const * const f)
        // log
        //uint8_t cmdbytes[] = {bits,   BYTEx(data, 0), BYTEx(data, 1)};
        //LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, FALSE);
-       
-       cardmem = BigBuf_get_EM_addr();
-
+       Dbprintf("ICE: enter frame_handle_tag: %02x ", f->bits);
+               
        /* First Part of Handshake (IV) */
        if(f->bits == 7) {
 
                LED_C_ON();
 
                // Reset prng timer
-               ResetTimer(prng_timer);
+               //ResetTimer(prng_timer);
+               ResetTicks();
 
                // IV from reader.
                legic_prng_init(f->data);
                
+               Dbprintf("ICE: IV: %02x ", f->data);
+               
                // We should have three tagtypes with three different answers.
-               frame_send_tag(0x3d, 6); /* 0x3d^0x26 = 0x1B */
+               legic_prng_forward(2);
+               //frame_send_tag(0x3d, 6); /* MIM1024 0x3d^0x26 = 0x1B */
+               frame_send_tag(0x1d, 6); // MIM256
                
                legic_state = STATE_IV;
                legic_read_count = 0;
                legic_prng_bc = 0;
                legic_prng_iv = f->data;
 
-
-               ResetTimer(timer);
-               WaitUS(280);
+               //ResetTimer(timer);
+               //WaitUS(280);
+               WaitTicks(388);
                return;
        }
 
@@ -689,8 +694,10 @@ static void frame_handle_tag(struct legic_frame const * const f)
       if((f->bits == 6) && (f->data == xored)) {
          legic_state = STATE_CON;
 
-                ResetTimer(timer);
-                WaitUS(200);
+                //ResetTimer(timer);
+
+                //WaitUS(200);
+                WaitTicks(300);
          return;
 
         } else {
@@ -708,13 +715,14 @@ static void frame_handle_tag(struct legic_frame const * const f)
          uint16_t addr = f->data ^ key; 
                 addr >>= 1;
          uint8_t data = cardmem[addr];
-         int hash = legic4Crc(LEGIC_READ, addr, data, 11) << 8;
+                
+         uint32_t crc = legic4Crc(LEGIC_READ, addr, data, 11) << 8;
 
-         legic_read_count++;
-         legic_prng_forward(legic_reqresp_drift);
+         //legic_read_count++;
+         //legic_prng_forward(legic_reqresp_drift);
 
-         frame_send_tag(hash | data, 12);
-                ResetTimer(timer);
+         frame_send_tag(crc | data, 12);
+                //ResetTimer(timer);
          legic_prng_forward(2);
                 WaitTicks(330);
          return;
@@ -745,11 +753,11 @@ static void frame_handle_tag(struct legic_frame const * const f)
       Dbprintf("IV: %03.3x", legic_prng_iv);
    }
 
-   legic_state = STATE_DISCON; 
-   legic_read_count = 0;
-   SpinDelay(10);
-   LED_C_OFF();
-   return; 
+       legic_state = STATE_DISCON; 
+       legic_read_count = 0;
+       WaitMS(10);
+       LED_C_OFF();
+       return; 
 }
 
 /* Read bit by bit untill full frame is received
@@ -757,6 +765,7 @@ static void frame_handle_tag(struct legic_frame const * const f)
  */
 static void emit(int bit) {
 
+       Dbprintf("ICE: enter emit:");
        switch (bit) {
                case 1:
                        frame_append_bit(&current_frame, 1);
@@ -790,18 +799,24 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
    */
                
        int old_level = 0, active = 0;
+       volatile uint32_t level = 0;
+       
        legic_state = STATE_DISCON;
-
        legic_phase_drift = phase;
        legic_frame_drift = frame;
        legic_reqresp_drift = reqresp;
 
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+       
+       /* to get the stream of bits from FPGA in sim mode.*/
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+       FpgaSetupSsc(); 
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_212K);
 
        /* Bitbang the receiver */
-       LINE_IN;
+//     LINE_IN;
+       AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
+       AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
 
        // need a way to determine which tagtype we are simulating
        
@@ -819,7 +834,8 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
        DbpString("Starting Legic emulator, press button to end");
    
        while(!BUTTON_PRESS() && !usb_poll_validate_length()) {
-               volatile uint32_t level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
+               
+               level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
 
                uint32_t time = GET_TICKS;
 
@@ -849,7 +865,7 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
                }
 
                /* Frame end */
-               if(time >= (RWD_TIME_1+RWD_TIME_FUZZ) && active) {
+               if(time >= (RWD_TIME_1 + RWD_TIME_FUZZ) && active) {
                        emit(-1);
                        active = 0;
                        LED_A_OFF();
@@ -860,14 +876,16 @@ void LegicRfSimulate(int phase, int frame, int reqresp)
                * shutdown in its status register. Reading the SR has the
                * side-effect of clearing any pending state in there.
                */
-               if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA))
-                       StopTicks();
+               //if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA))
+               //if(time >= (20 * RWD_TIME_1) )
+               //StopTicks();
 
                old_level = level;
                WDT_HIT();
        }
 
        WDT_HIT();
+       DbpString("LEGIC Prime emulator stopped");
        switch_off_tag_rwd();
        LEDsoff();
        cmd_send(CMD_ACK, 1, 0, 0, 0, 0);