meant to put clock detection before demods

[proxmark3-svn] / armsrc / iso14443b.c

diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c
index f8e6046ca487b20d24b071e549b98e77df4cd49b..22227e74bec96651d5c2620dd37f4bea210f27d2 100644 (file)
--- a/armsrc/iso14443b.c
+++ b/armsrc/iso14443b.c
@@ -324,10 +324,14 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len)
 //-----------------------------------------------------------------------------
 void SimulateIso14443bTag(void)
 {
-       // the only commands we understand is REQB, AFI=0, Select All, N=0:
-       static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 };
-       // ... and REQB, AFI=0, Normal Request, N=0:
-       static const uint8_t cmd2[] = { 0x05, 0x00, 0x00, 0x71, 0xFF };
+       // the only commands we understand is WUPB, AFI=0, Select All, N=1:
+       static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; // WUPB
+       // ... and REQB, AFI=0, Normal Request, N=1:
+       static const uint8_t cmd2[] = { 0x05, 0x00, 0x00, 0x71, 0xFF }; // REQB
+       // ... and HLTB
+       static const uint8_t cmd3[] = { 0x50, 0xff, 0xff, 0xff, 0xff }; // HLTB
+       // ... and ATTRIB
+       static const uint8_t cmd4[] = { 0x1D, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; // ATTRIB
 
        // ... and we always respond with ATQB, PUPI = 820de174, Application Data = 0x20381922,
        // supports only 106kBit/s in both directions, max frame size = 32Bytes,
@@ -336,6 +340,9 @@ void SimulateIso14443bTag(void)
                0x50, 0x82, 0x0d, 0xe1, 0x74, 0x20, 0x38, 0x19, 0x22,
                0x00, 0x21, 0x85, 0x5e, 0xd7
        };
+       // response to HLTB and ATTRIB
+       static const uint8_t response2[] = {0x00, 0x78, 0xF0};
+
 
        FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 
@@ -359,6 +366,12 @@ void SimulateIso14443bTag(void)
        memcpy(resp1Code, ToSend, ToSendMax);
        uint16_t resp1CodeLen = ToSendMax;
 
+       // prepare the (other) tag answer:
+       CodeIso14443bAsTag(response2, sizeof(response2));
+       uint8_t *resp2Code = BigBuf_malloc(ToSendMax);
+       memcpy(resp2Code, ToSend, ToSendMax);
+       uint16_t resp2CodeLen = ToSendMax;
+
        // We need to listen to the high-frequency, peak-detected path.
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
        FpgaSetupSsc();
@@ -384,18 +397,33 @@ void SimulateIso14443bTag(void)
                        respLen = sizeof(response1);
                        respCode = resp1Code;
                        respCodeLen = resp1CodeLen;
+               } else if ( (len == sizeof(cmd3) && receivedCmd[0] == cmd3[0])
+                       || (len == sizeof(cmd4) && receivedCmd[0] == cmd4[0]) ) {
+                       resp = response2;
+                       respLen = sizeof(response2);
+                       respCode = resp2Code;
+                       respCodeLen = resp2CodeLen;
                } else {
                        Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd);
                        // And print whether the CRC fails, just for good measure
                        uint8_t b1, b2;
-                       ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2);
-                       if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) {
-                               // Not so good, try again.
-                               DbpString("+++CRC fail");
-                       } else {
-                               DbpString("CRC passes");
+                       if (len >= 3){ // if crc exists
+                               ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2);
+                               if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) {
+                                       // Not so good, try again.
+                                       DbpString("+++CRC fail");
+               
+                               } else {
+                                       DbpString("CRC passes");
+                               }
                        }
-                       break;
+                       //get rid of compiler warning
+                       respCodeLen = 0;
+                       resp = response1;
+                       respLen = 0;
+                       respCode = resp1Code;
+                       //don't crash at new command just wait and see if reader will send other new cmds.
+                       //break;
                }
 
                cmdsRecvd++;
@@ -519,15 +547,20 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
        }
  */
 // Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq)))
+
+       //note: couldn't we just use MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2) from common.h - marshmellow
 #define CHECK_FOR_SUBCARRIER() { \
+               v = MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2); \
+       }
+               /*
                if(ci < 0) { \
-                       if(cq < 0) { /* ci < 0, cq < 0 */ \
+                       if(cq < 0) { \ // ci < 0, cq < 0
                                if (cq < ci) { \
                                        v = -cq - (ci >> 1); \
                                } else { \
                                        v = -ci - (cq >> 1); \
                                } \
-                       } else {        /* ci < 0, cq >= 0 */ \
+                       } else {        \ // ci < 0, cq >= 0
                                if (cq < -ci) { \
                                        v = -ci + (cq >> 1); \
                                } else { \
@@ -535,13 +568,13 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
                                } \
                        } \
                } else { \
-                       if(cq < 0) { /* ci >= 0, cq < 0 */ \
+                       if(cq < 0) { \ // ci >= 0, cq < 0
                                if (-cq < ci) { \
                                        v = ci - (cq >> 1); \
                                } else { \
                                        v = -cq + (ci >> 1); \
                                } \
-                       } else {        /* ci >= 0, cq >= 0 */ \
+                       } else {        \ // ci >= 0, cq >= 0
                                if (cq < ci) { \
                                        v = ci + (cq >> 1); \
                                } else { \
@@ -550,6 +583,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
                        } \
                } \
        }
+               */
 
        switch(Demod.state) {
                case DEMOD_UNSYNCD:
@@ -1295,14 +1329,16 @@ void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, u
        SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
        FpgaSetupSsc();
 
-       set_tracing(TRUE);
-
-       CodeAndTransmit14443bAsReader(data, datalen);
+       if (datalen){
+               set_tracing(TRUE);
+               
+               CodeAndTransmit14443bAsReader(data, datalen);
 
-       if(recv) {
-               GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
-               uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE);
-               cmd_send(CMD_ACK, iLen, 0, 0, Demod.output, iLen);
+               if(recv) {
+                       GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+                       uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE);
+                       cmd_send(CMD_ACK, iLen, 0, 0, Demod.output, iLen);
+               }
        }
 
        if(!powerfield) {