fix 'hf iclass sim':
authorpwpiwi <pwpiwi@users.noreply.github.com>
Sat, 21 Sep 2019 09:58:51 +0000 (11:58 +0200)
committerpwpiwi <pwpiwi@users.noreply.github.com>
Tue, 24 Sep 2019 17:23:21 +0000 (19:23 +0200)
* chg to reader command decoder in iso15693.c (require no modulation before SOF)
* add 'has_been_low_for' logic to hi_simulate.v (same as in other FPGA modes, default to "no modulation")
* add simulation of chip status (IDLE, ACTIVE, SELECTED, HALTED)
* check ACSN on SELECT
* add simulation of RESELECT
* always check length of reader commands
* fix printing of NR, MAC in sim 2 mode
* fix response length to CHECK command

armsrc/iclass.c
armsrc/iso15693.c
client/cmdhficlass.c
fpga/fpga_hf.bit
fpga/hi_simulate.v

index 66238a10e363df7f0ab4ff0f6bae47ab679e46d6..23701540f1c50f0f29a1b16a010640ab96203524 100644 (file)
@@ -777,8 +777,6 @@ static void AppendCrc(uint8_t *data, int len) {
 
 /**
  * @brief Does the actual simulation
- * @param csn - csn to use
- * @param breakAfterMacReceived if true, returns after reader MAC has been received.
  */
 int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 
@@ -919,6 +917,8 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
 
        LED_A_ON();
        bool buttonPressed = false;
+       enum { IDLE, ACTIVATED, SELECTED, HALTED } chip_state = IDLE;
+
        while (!exitLoop) {
                WDT_HIT();
                LED_B_OFF();
@@ -943,162 +943,193 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
                trace_data = NULL;
                trace_data_size = 0;
 
-               if (receivedCmd[0] == ICLASS_CMD_ACTALL) {
-                       // Reader in anticollission phase
-                       modulated_response = resp_sof;
-                       modulated_response_size = resp_sof_Len;
-                       trace_data = sof_data;
-                       trace_data_size = sizeof(sof_data);
+               if (receivedCmd[0] == ICLASS_CMD_ACTALL && len == 1) {
+                       // Reader in anticollision phase
+                       if (chip_state != HALTED) {
+                               modulated_response = resp_sof;
+                               modulated_response_size = resp_sof_Len;
+                               trace_data = sof_data;
+                               trace_data_size = sizeof(sof_data);
+                               chip_state = ACTIVATED;
+                       }
 
                } else if (receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 1) { // identify
-                       // Reader asks for anticollission CSN
-                       modulated_response = resp_anticoll;
-                       modulated_response_size = resp_anticoll_len;
-                       trace_data = anticoll_data;
-                       trace_data_size = sizeof(anticoll_data);
+                       // Reader asks for anticollision CSN
+                       if (chip_state == SELECTED || chip_state == ACTIVATED) {
+                               modulated_response = resp_anticoll;
+                               modulated_response_size = resp_anticoll_len;
+                               trace_data = anticoll_data;
+                               trace_data_size = sizeof(anticoll_data);
+                       }
+
+               } else if (receivedCmd[0] == ICLASS_CMD_SELECT && len == 9) {
+                       // Reader selects anticollision CSN.
+                       // Tag sends the corresponding real CSN
+                       if (chip_state == ACTIVATED || chip_state == SELECTED) {
+                               if (!memcmp(receivedCmd+1, anticoll_data, 8)) {
+                                       modulated_response = resp_csn;
+                                       modulated_response_size = resp_csn_len;
+                                       trace_data = csn_data;
+                                       trace_data_size = sizeof(csn_data);
+                                       chip_state = SELECTED;
+                               } else {
+                                       chip_state = IDLE;
+                               }
+                       } else if (chip_state == HALTED) {
+                               // RESELECT with CSN
+                               if (!memcmp(receivedCmd+1, csn_data, 8)) {
+                                       modulated_response = resp_csn;
+                                       modulated_response_size = resp_csn_len;
+                                       trace_data = csn_data;
+                                       trace_data_size = sizeof(csn_data);
+                                       chip_state = SELECTED;
+                               }
+                       }
 
                } else if (receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 4) { // read block
                        uint16_t blockNo = receivedCmd[1];
-                       if (simulationMode == ICLASS_SIM_MODE_EXIT_AFTER_MAC) {
-                               // provide defaults for blocks 0 ... 5
-                               switch (blockNo) {
-                                       case 0: // csn (block 00)
-                                               modulated_response = resp_csn;
-                                               modulated_response_size = resp_csn_len;
-                                               trace_data = csn_data;
-                                               trace_data_size = sizeof(csn_data);
-                                               break;
-                                       case 1: // configuration (block 01)
-                                               modulated_response = resp_conf;
-                                               modulated_response_size = resp_conf_len;
-                                               trace_data = conf_data;
-                                               trace_data_size = sizeof(conf_data);
-                                               break;
-                                       case 2: // e-purse (block 02)
-                                               modulated_response = resp_cc;
-                                               modulated_response_size = resp_cc_len;
-                                               trace_data = card_challenge_data;
-                                               trace_data_size = sizeof(card_challenge_data);
-                                               // set epurse of sim2,4 attack
-                                               if (reader_mac_buf != NULL) {
-                                                       memcpy(reader_mac_buf, card_challenge_data, 8);
-                                               }
-                                               break;
-                                       case 3:
-                                       case 4: // Kd, Kd, always respond with 0xff bytes
+                       if (chip_state == SELECTED) {
+                               if (simulationMode == ICLASS_SIM_MODE_EXIT_AFTER_MAC) {
+                                       // provide defaults for blocks 0 ... 5
+                                       switch (blockNo) {
+                                               case 0: // csn (block 00)
+                                                       modulated_response = resp_csn;
+                                                       modulated_response_size = resp_csn_len;
+                                                       trace_data = csn_data;
+                                                       trace_data_size = sizeof(csn_data);
+                                                       break;
+                                               case 1: // configuration (block 01)
+                                                       modulated_response = resp_conf;
+                                                       modulated_response_size = resp_conf_len;
+                                                       trace_data = conf_data;
+                                                       trace_data_size = sizeof(conf_data);
+                                                       break;
+                                               case 2: // e-purse (block 02)
+                                                       modulated_response = resp_cc;
+                                                       modulated_response_size = resp_cc_len;
+                                                       trace_data = card_challenge_data;
+                                                       trace_data_size = sizeof(card_challenge_data);
+                                                       // set epurse of sim2,4 attack
+                                                       if (reader_mac_buf != NULL) {
+                                                               memcpy(reader_mac_buf, card_challenge_data, 8);
+                                                       }
+                                                       break;
+                                               case 3:
+                                               case 4: // Kd, Kc, always respond with 0xff bytes
+                                                       modulated_response = resp_ff;
+                                                       modulated_response_size = resp_ff_len;
+                                                       trace_data = ff_data;
+                                                       trace_data_size = sizeof(ff_data);
+                                                       break;
+                                               case 5: // Application Issuer Area (block 05)
+                                                       modulated_response = resp_aia;
+                                                       modulated_response_size = resp_aia_len;
+                                                       trace_data = aia_data;
+                                                       trace_data_size = sizeof(aia_data);
+                                                       break;
+                                               // default: don't respond
+                                       }
+                               } else if (simulationMode == ICLASS_SIM_MODE_FULL) {
+                                       if (blockNo == 3 || blockNo == 4) { // Kd, Kc, always respond with 0xff bytes
                                                modulated_response = resp_ff;
                                                modulated_response_size = resp_ff_len;
                                                trace_data = ff_data;
                                                trace_data_size = sizeof(ff_data);
-                                               break;
-                                       case 5: // Application Issuer Area (block 05)
-                                               modulated_response = resp_aia;
-                                               modulated_response_size = resp_aia_len;
-                                               trace_data = aia_data;
-                                               trace_data_size = sizeof(aia_data);
-                                               break;
-                                       // default: don't respond
+                                       } else { // use data from emulator memory
+                                               memcpy(data_generic_trace, emulator + 8*blockNo, 8);
+                                               AppendCrc(data_generic_trace, 8);
+                                               trace_data = data_generic_trace;
+                                               trace_data_size = 10;
+                                               CodeIso15693AsTag(trace_data, trace_data_size);
+                                               memcpy(data_response, ToSend, ToSendMax);
+                                               modulated_response = data_response;
+                                               modulated_response_size = ToSendMax;
+                                       }
                                }
-                       } else if (simulationMode == ICLASS_SIM_MODE_FULL) {
-                               if (blockNo == 3 || blockNo == 4) { // Kd, Kc, always respond with 0xff bytes
-                                       modulated_response = resp_ff;
-                                       modulated_response_size = resp_ff_len;
-                                       trace_data = ff_data;
-                                       trace_data_size = sizeof(ff_data);
-                               } else { // use data from emulator memory
-                                       memcpy(data_generic_trace, emulator + (receivedCmd[1] << 3), 8);
-                                       AppendCrc(data_generic_trace, 8);
+                       }
+
+               } else if ((receivedCmd[0] == ICLASS_CMD_READCHECK_KD
+                                       || receivedCmd[0] == ICLASS_CMD_READCHECK_KC) && len == 2) {
+                       // Read e-purse (88 02 || 18 02)
+                       if (chip_state == SELECTED) {
+                               modulated_response = resp_cc;
+                               modulated_response_size = resp_cc_len;
+                               trace_data = card_challenge_data;
+                               trace_data_size = sizeof(card_challenge_data);
+                               LED_B_ON();
+                       }
+
+               } else if (receivedCmd[0] == ICLASS_CMD_CHECK && len == 9) {
+                       // Reader random and reader MAC!!!
+                       if (chip_state == SELECTED) {
+                               if (simulationMode == ICLASS_SIM_MODE_FULL) {
+                                       //NR, from reader, is in receivedCmd+1
+                                       opt_doTagMAC_2(cipher_state, receivedCmd+1, data_generic_trace, diversified_key);
                                        trace_data = data_generic_trace;
-                                       trace_data_size = 10;
+                                       trace_data_size = 4;
                                        CodeIso15693AsTag(trace_data, trace_data_size);
                                        memcpy(data_response, ToSend, ToSendMax);
                                        modulated_response = data_response;
                                        modulated_response_size = ToSendMax;
+                                       //exitLoop = true;
+                               } else { // Not fullsim, we don't respond
+                                       // We do not know what to answer, so lets keep quiet
+                                       if (simulationMode == ICLASS_SIM_MODE_EXIT_AFTER_MAC) {
+                                               if (reader_mac_buf != NULL) {
+                                                       // save NR and MAC for sim 2,4
+                                                       memcpy(reader_mac_buf + 8, receivedCmd + 1, 8);
+                                               }
+                                               exitLoop = true;
+                                       }
                                }
                        }
 
-               } else if (receivedCmd[0] == ICLASS_CMD_SELECT) {
-                       // Reader selects anticollission CSN.
-                       // Tag sends the corresponding real CSN
-                       modulated_response = resp_csn;
-                       modulated_response_size = resp_csn_len;
-                       trace_data = csn_data;
-                       trace_data_size = sizeof(csn_data);
-
-               } else if (receivedCmd[0] == ICLASS_CMD_READCHECK_KD
-                                       || receivedCmd[0] == ICLASS_CMD_READCHECK_KC) {
-                       // Read e-purse (88 02 || 18 02)
-                       modulated_response = resp_cc;
-                       modulated_response_size = resp_cc_len;
-                       trace_data = card_challenge_data;
-                       trace_data_size = sizeof(card_challenge_data);
-                       LED_B_ON();
+               } else if (receivedCmd[0] == ICLASS_CMD_HALT && len == 1) {
+                       if (chip_state == SELECTED) {
+                               // Reader ends the session
+                               chip_state = HALTED;
+                       }
 
-               } else if (receivedCmd[0] == ICLASS_CMD_CHECK) {
-                       // Reader random and reader MAC!!!
-                       if (simulationMode == ICLASS_SIM_MODE_FULL) {
-                               //NR, from reader, is in receivedCmd+1
-                               opt_doTagMAC_2(cipher_state, receivedCmd+1, data_generic_trace, diversified_key);
+               } else if (simulationMode == ICLASS_SIM_MODE_FULL && receivedCmd[0] == ICLASS_CMD_READ4 && len == 4) {  // 0x06
+                       //Read 4 blocks
+                       if (chip_state == SELECTED) {
+                               memcpy(data_generic_trace, emulator + (receivedCmd[1] << 3), 8 * 4);
+                               AppendCrc(data_generic_trace, 8 * 4);
                                trace_data = data_generic_trace;
-                               trace_data_size = 4;
+                               trace_data_size = 8 * 4 + 2;
                                CodeIso15693AsTag(trace_data, trace_data_size);
                                memcpy(data_response, ToSend, ToSendMax);
                                modulated_response = data_response;
                                modulated_response_size = ToSendMax;
-                               //exitLoop = true;
-                       } else { // Not fullsim, we don't respond
-                               // We do not know what to answer, so lets keep quiet
-                               if (simulationMode == ICLASS_SIM_MODE_EXIT_AFTER_MAC) {
-                                       if (reader_mac_buf != NULL) {
-                                               // save NR and MAC for sim 2,4
-                                               memcpy(reader_mac_buf + 8, receivedCmd + 1, 8);
-                                       }
-                                       exitLoop = true;
-                               }
                        }
 
-               } else if (receivedCmd[0] == ICLASS_CMD_HALT && len == 1) {
-                       // Reader ends the session
-                       modulated_response = resp_sof;
-                       modulated_response_size = 0;
-                       trace_data = NULL;
-                       trace_data_size = 0;
-
-               } else if (simulationMode == ICLASS_SIM_MODE_FULL && receivedCmd[0] == ICLASS_CMD_READ4 && len == 4) {  // 0x06
-                       //Read block
-                       //Take the data...
-                       memcpy(data_generic_trace, emulator + (receivedCmd[1] << 3), 8 * 4);
-                       AppendCrc(data_generic_trace, 8 * 4);
-                       trace_data = data_generic_trace;
-                       trace_data_size = 8 * 4 + 2;
-                       CodeIso15693AsTag(trace_data, trace_data_size);
-                       memcpy(data_response, ToSend, ToSendMax);
-                       modulated_response = data_response;
-                       modulated_response_size = ToSendMax;
-
-               } else if (receivedCmd[0] == ICLASS_CMD_UPDATE && simulationMode == ICLASS_SIM_MODE_FULL) {
+               } else if (receivedCmd[0] == ICLASS_CMD_UPDATE && (len == 12 || len == 14)) {
                        // Probably the reader wants to update the nonce. Let's just ignore that for now.
                        // OBS! If this is implemented, don't forget to regenerate the cipher_state
                        // We're expected to respond with the data+crc, exactly what's already in the receivedCmd
                        // receivedCmd is now UPDATE 1b | ADDRESS 1b | DATA 8b | Signature 4b or CRC 2b
-                       memcpy(data_generic_trace, receivedCmd + 2, 8);
-                       AppendCrc(data_generic_trace, 8);
-                       trace_data = data_generic_trace;
-                       trace_data_size = 10;
-                       CodeIso15693AsTag(trace_data, trace_data_size);
-                       memcpy(data_response, ToSend, ToSendMax);
-                       modulated_response = data_response;
-                       modulated_response_size = ToSendMax;
-
-               } else if (receivedCmd[0] == ICLASS_CMD_PAGESEL) {
+                       if (chip_state == SELECTED) {
+                               memcpy(data_generic_trace, receivedCmd + 2, 8);
+                               AppendCrc(data_generic_trace, 8);
+                               trace_data = data_generic_trace;
+                               trace_data_size = 10;
+                               CodeIso15693AsTag(trace_data, trace_data_size);
+                               memcpy(data_response, ToSend, ToSendMax);
+                               modulated_response = data_response;
+                               modulated_response_size = ToSendMax;
+                       }
+
+               } else if (receivedCmd[0] == ICLASS_CMD_PAGESEL && len == 4) {
                        // Pagesel
-                       // Pagesel enables to select a page in the selected chip memory and return its configuration block
-                       // Chips with a single page will not answer to this command
-                       // It appears we're fine ignoring this.
-                       // Otherwise, we should answer 8bytes (block) + 2bytes CRC
+                       if (chip_state == SELECTED) {
+                               // Pagesel enables to select a page in the selected chip memory and return its configuration block
+                               // Chips with a single page will not answer to this command
+                               // It appears we're fine ignoring this.
+                               // Otherwise, we should answer 8bytes (block) + 2bytes CRC
+                       }
 
                } else {
-                       // Never seen this command before
+                       // don't know how to handle this command
                        char debug_message[250]; // should be enough
                        sprintf(debug_message, "Unhandled command (len = %d) received from reader:", len);
                        for (int i = 0; i < len && strlen(debug_message) < sizeof(debug_message) - 3 - 1; i++) {
@@ -1187,8 +1218,9 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
                                        datain[i*8+0], datain[i*8+1], datain[i*8+2], datain[i*8+3],
                                        datain[i*8+4], datain[i*8+5], datain[i*8+6], datain[i*8+7]);
                        Dbprintf("NR,MAC: %02x %02x %02x %02x %02x %02x %02x %02x",
-                                       datain[i*8+ 8], datain[i*8+ 9], datain[i*8+10], datain[i*8+11],
-                                       datain[i*8+12], datain[i*8+13], datain[i*8+14], datain[i*8+15]);
+                                       mac_responses[i*16+ 8], mac_responses[i*16+ 9], mac_responses[i*16+10], mac_responses[i*16+11],
+                                       mac_responses[i*16+12], mac_responses[i*16+13], mac_responses[i*16+14], mac_responses[i*16+15]);
+                       SpinDelay(100); // give the reader some time to prepare for next CSN
                }
                cmd_send(CMD_ACK, CMD_SIMULATE_TAG_ICLASS, i, 0, mac_responses, i*16);
        } else if (simType == ICLASS_SIM_MODE_FULL) {
index 4b4577e79b0f8bb797f3026c6c8dd70d6f8f266d..f33e0156cda0614154f45bc56694b1828dc39c86 100644 (file)
@@ -671,6 +671,7 @@ static int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, int tim
 typedef struct DecodeReader {
        enum {
                STATE_READER_UNSYNCD,
+               STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF,
                STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF,
                STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF,
                STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF,
@@ -714,6 +715,13 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin
 {
        switch (DecodeReader->state) {
                case STATE_READER_UNSYNCD:
+                       // wait for unmodulated carrier
+                       if (bit) {
+                               DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF;
+                       }
+                       break;
+
+               case STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF:
                        if (!bit) {
                                // we went low, so this could be the beginning of a SOF
                                DecodeReader->posCount = 1;
@@ -725,7 +733,7 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin
                        DecodeReader->posCount++;
                        if (bit) { // detected rising edge
                                if (DecodeReader->posCount < 4) { // rising edge too early (nominally expected at 5)
-                                       DecodeReaderReset(DecodeReader);
+                                       DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF;
                                } else { // SOF
                                        DecodeReader->state = STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF;
                                }
@@ -748,13 +756,13 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin
                                        DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF;
                                } else if (DecodeReader->posCount < 28) {  // falling edge too early (nominally expected at 29 latest)
                                        DecodeReaderReset(DecodeReader);
-                               } else {                                 // SOF for 1 out of 4 coding
+                               } else {                                   // SOF for 1 out of 256 coding
                                        DecodeReader->Coding = CODING_1_OUT_OF_256;
                                        DecodeReader->state = STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF;
                                }
                        } else {
                                if (DecodeReader->posCount > 29) { // stayed high for too long
-                                       DecodeReaderReset(DecodeReader);
+                                       DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF;
                                } else {
                                        // do nothing, keep waiting
                                }
@@ -766,7 +774,7 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin
                        if (bit) { // detected rising edge
                                if (DecodeReader->Coding == CODING_1_OUT_OF_256) {
                                        if (DecodeReader->posCount < 32) { // rising edge too early (nominally expected at 33)
-                                       DecodeReaderReset(DecodeReader);
+                                               DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF;
                                        } else {
                                                DecodeReader->posCount = 1;
                                                DecodeReader->bitCount = 0;
@@ -777,21 +785,22 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin
                                        }
                                } else { // CODING_1_OUT_OF_4
                                        if (DecodeReader->posCount < 24) { // rising edge too early (nominally expected at 25)
-                                       DecodeReaderReset(DecodeReader);
+                                               DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF;
                                        } else {
+                                               DecodeReader->posCount = 1;
                                                DecodeReader->state = STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4;
                                        }
                                }
                        } else {
                                if (DecodeReader->Coding == CODING_1_OUT_OF_256) {
                                        if (DecodeReader->posCount > 34) { // signal stayed low for too long
-                                       DecodeReaderReset(DecodeReader);
+                                               DecodeReaderReset(DecodeReader);
                                        } else {
                                                // do nothing, keep waiting
                                        }
                                } else { // CODING_1_OUT_OF_4
                                        if (DecodeReader->posCount > 26) { // signal stayed low for too long
-                                       DecodeReaderReset(DecodeReader);
+                                               DecodeReaderReset(DecodeReader);
                                        } else {
                                                // do nothing, keep waiting
                                        }
@@ -802,7 +811,7 @@ static int inline __attribute__((always_inline)) Handle15693SampleFromReader(uin
                case STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4:
                        DecodeReader->posCount++;
                        if (bit) {
-                               if (DecodeReader->posCount == 33) {
+                               if (DecodeReader->posCount == 9) {
                                        DecodeReader->posCount = 1;
                                        DecodeReader->bitCount = 0;
                                        DecodeReader->byteCount = 0;
index ee0dd16eda99a1856978f6f0a220d99702050bc1..48b62b176b94e07002d221d89f12f9217b4ff7cb 100644 (file)
@@ -100,7 +100,46 @@ int usage_hf_iclass_sim(void) {
        return 0;
 }
 
+// the original malicious IDs from Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult,
+// and Milosch Meriac. Dismantling iClass and iClass Elite.
 #define NUM_CSNS 15
+static uint8_t csns[8 * NUM_CSNS] = {
+       0x00, 0x0B, 0x0F, 0xFF, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x04, 0x0E, 0x08, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x09, 0x0D, 0x05, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x0A, 0x0C, 0x06, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x0F, 0x0B, 0x03, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x08, 0x0A, 0x0C, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x0D, 0x09, 0x09, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x0E, 0x08, 0x0A, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x03, 0x07, 0x17, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x3C, 0x06, 0xE0, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x01, 0x05, 0x1D, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x02, 0x04, 0x1E, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x07, 0x03, 0x1B, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x00, 0x02, 0x24, 0xF7, 0xFF, 0x12, 0xE0,
+       0x00, 0x05, 0x01, 0x21, 0xF7, 0xFF, 0x12, 0xE0 };
+
+
+// pre-defined 9 CSNs by iceman.
+// only one csn depend on several others.
+// six depends only on the first csn,  (0,1, 0x45)
+
+// #define NUM_CSNS 9
+// static uint8_t csns[8 * NUM_CSNS] = {
+    // 0x01, 0x0A, 0x0F, 0xFF, 0xF7, 0xFF, 0x12, 0xE0,
+    // 0x0C, 0x06, 0x0C, 0xFE, 0xF7, 0xFF, 0x12, 0xE0,
+    // 0x10, 0x97, 0x83, 0x7B, 0xF7, 0xFF, 0x12, 0xE0,
+    // 0x13, 0x97, 0x82, 0x7A, 0xF7, 0xFF, 0x12, 0xE0,
+    // 0x07, 0x0E, 0x0D, 0xF9, 0xF7, 0xFF, 0x12, 0xE0,
+    // 0x14, 0x96, 0x84, 0x76, 0xF7, 0xFF, 0x12, 0xE0,
+    // 0x17, 0x96, 0x85, 0x71, 0xF7, 0xFF, 0x12, 0xE0,
+    // 0xCE, 0xC5, 0x0F, 0x77, 0xF7, 0xFF, 0x12, 0xE0,
+    // 0xD2, 0x5A, 0x82, 0xF8, 0xF7, 0xFF, 0x12, 0xE0
+    // //0x04, 0x08, 0x9F, 0x78, 0x6E, 0xFF, 0x12, 0xE0
+// };
+
+
 int CmdHFiClassSim(const char *Cmd) {
        uint8_t simType = 0;
        uint8_t CSN[8] = {0, 0, 0, 0, 0, 0, 0, 0};
@@ -123,23 +162,6 @@ int CmdHFiClassSim(const char *Cmd) {
                UsbCommand c = {CMD_SIMULATE_TAG_ICLASS, {simType, NUM_CSNS}};
                UsbCommand resp = {0};
 
-               uint8_t csns[8 * NUM_CSNS] = {
-                       0x00, 0x0B, 0x0F, 0xFF, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x04, 0x0E, 0x08, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x09, 0x0D, 0x05, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x0A, 0x0C, 0x06, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x0F, 0x0B, 0x03, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x08, 0x0A, 0x0C, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x0D, 0x09, 0x09, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x0E, 0x08, 0x0A, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x03, 0x07, 0x17, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x3C, 0x06, 0xE0, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x01, 0x05, 0x1D, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x02, 0x04, 0x1E, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x07, 0x03, 0x1B, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x00, 0x02, 0x24, 0xF7, 0xFF, 0x12, 0xE0,
-                       0x00, 0x05, 0x01, 0x21, 0xF7, 0xFF, 0x12, 0xE0 };
-
                memcpy(c.d.asBytes, csns, 8 * NUM_CSNS);
 
                SendCommand(&c);
index 70c7909aeb328809bb41a63c389b1db42501aceb..1bd3c416fe728c26ee204ede9bc882c8f87486c8 100644 (file)
Binary files a/fpga/fpga_hf.bit and b/fpga/fpga_hf.bit differ
index 92ebcb51387c48be14eef162931115c68096b04b..097b8a084a3e5daadca9d6e31d4f8ea64ee8527f 100644 (file)
@@ -33,15 +33,33 @@ module hi_simulate(
     output dbg;
     input [2:0] mod_type;
 
+assign adc_clk = ck_1356meg;
 
 // The comparator with hysteresis on the output from the peak detector.
 reg after_hysteresis;
-assign adc_clk = ck_1356meg;
+reg [11:0] has_been_low_for;
 
 always @(negedge adc_clk)
 begin
-    if(& adc_d[7:5]) after_hysteresis = 1'b1;           // if (adc_d >= 224)
-    else if(~(| adc_d[7:5])) after_hysteresis = 1'b0;   // if (adc_d <= 31)
+    if (& adc_d[7:5]) after_hysteresis <= 1'b1;           // if (adc_d >= 224)
+    else if (~(| adc_d[7:5])) after_hysteresis <= 1'b0;   // if (adc_d <= 31)
+
+       if (adc_d >= 224)
+    begin
+        has_been_low_for <= 12'd0;
+    end
+    else
+    begin
+        if (has_been_low_for == 12'd4095)
+        begin
+            has_been_low_for <= 12'd0;
+            after_hysteresis <= 1'b1;
+        end
+        else
+               begin
+            has_been_low_for <= has_been_low_for + 1;
+               end     
+    end
 end
 
 
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