// Jonathan Westhues, split Nov 2006
// Modified by Greg Jones, Jan 2009
// Modified by Adrian Dabrowski "atrox", Mar-Sept 2010,Oct 2011
+// Modified by piwi, Oct 2018
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Routines to support ISO 15693. This includes both the reader software and
-// the `fake tag' modes, but at the moment I've implemented only the reader
-// stuff, and that barely.
-// Modified to perform modulation onboard in arm rather than on PC
-// Also added additional reader commands (SELECT, READ etc.)
+// the `fake tag' modes.
//-----------------------------------------------------------------------------
-// The ISO 15693 describes two transmission modes from reader to tag, and 4
-// transmission modes from tag to reader. As of Mar 2010 this code only
-// supports one of each: "1of4" mode from reader to tag, and the highspeed
-// variant with one subcarrier from card to reader.
-// As long, as the card fully support ISO 15693 this is no problem, since the
-// reader chooses both data rates, but some non-standard tags do not. Further for
-// the simulation to work, we will need to support all data rates.
+
+// The ISO 15693 describes two transmission modes from reader to tag, and four
+// transmission modes from tag to reader. As of Oct 2018 this code supports
+// both reader modes and the high speed variant with one subcarrier from card to reader.
+// As long as the card fully support ISO 15693 this is no problem, since the
+// reader chooses both data rates, but some non-standard tags do not.
+// For card simulation, the code supports both high and low speed modes with one subcarrier.
//
// VCD (reader) -> VICC (tag)
// 1 out of 256:
-// data rate: 1,66 kbit/s (fc/8192)
-// used for long range
+// data rate: 1,66 kbit/s (fc/8192)
+// used for long range
// 1 out of 4:
-// data rate: 26,48 kbit/s (fc/512)
-// used for short range, high speed
-//
+// data rate: 26,48 kbit/s (fc/512)
+// used for short range, high speed
+//
// VICC (tag) -> VCD (reader)
// Modulation:
-// ASK / one subcarrier (423,75 khz)
-// FSK / two subcarriers (423,75 khz && 484,28 khz)
+// ASK / one subcarrier (423,75 khz)
+// FSK / two subcarriers (423,75 khz && 484,28 khz)
// Data Rates / Modes:
-// low ASK: 6,62 kbit/s
-// low FSK: 6.67 kbit/s
-// high ASK: 26,48 kbit/s
-// high FSK: 26,69 kbit/s
+// low ASK: 6,62 kbit/s
+// low FSK: 6.67 kbit/s
+// high ASK: 26,48 kbit/s
+// high FSK: 26,69 kbit/s
//-----------------------------------------------------------------------------
-// added "1 out of 256" mode (for VCD->PICC) - atrox 20100911
// Random Remarks:
// *) UID is always used "transmission order" (LSB), which is reverse to display order
// TODO / BUGS / ISSUES:
-// *) writing to tags takes longer: we miss the answer from the tag in most cases
-// -> tweak the read-timeout times
-// *) signal decoding from the card is still a bit shaky.
-// *) signal decoding is unable to detect collissions.
-// *) add anti-collission support for inventory-commands
+// *) signal decoding is unable to detect collisions.
+// *) add anti-collision support for inventory-commands
// *) read security status of a block
-// *) sniffing and simulation do only support one transmission mode. need to support
-// all 8 transmission combinations
-// *) remove or refactor code under "depricated"
+// *) sniffing and simulation do not support two subcarrier modes.
+// *) remove or refactor code under "deprecated"
// *) document all the functions
+#include "iso15693.h"
#include "proxmark3.h"
#include "util.h"
#include "apps.h"
#include "string.h"
#include "iso15693tools.h"
-#include "cmd.h"
+#include "protocols.h"
+#include "usb_cdc.h"
+#include "BigBuf.h"
+#include "fpgaloader.h"
#define arraylen(x) (sizeof(x)/sizeof((x)[0]))
+// Delays in SSP_CLK ticks.
+// SSP_CLK runs at 13,56MHz / 32 = 423.75kHz when simulating a tag
+#define DELAY_READER_TO_ARM 8
+#define DELAY_ARM_TO_READER 0
+//SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when acting as reader. All values should be multiples of 16
+#define DELAY_ARM_TO_TAG 16
+#define DELAY_TAG_TO_ARM 32
+//SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when snooping. All values should be multiples of 16
+#define DELAY_TAG_TO_ARM_SNOOP 32
+#define DELAY_READER_TO_ARM_SNOOP 32
+
+// times in samples @ 212kHz when acting as reader
+//#define ISO15693_READER_TIMEOUT 80 // 80/212kHz = 378us, nominal t1_max=313,9us
+#define ISO15693_READER_TIMEOUT 330 // 330/212kHz = 1558us, should be even enough for iClass tags responding to ACTALL
+#define ISO15693_READER_TIMEOUT_WRITE 4700 // 4700/212kHz = 22ms, nominal 20ms
+
+
static int DEBUG = 0;
+
///////////////////////////////////////////////////////////////////////
// ISO 15693 Part 2 - Air Interface
-// This section basicly contains transmission and receiving of bits
+// This section basically contains transmission and receiving of bits
///////////////////////////////////////////////////////////////////////
-#define FrameSOF Iso15693FrameSOF
-#define Logic0 Iso15693Logic0
-#define Logic1 Iso15693Logic1
-#define FrameEOF Iso15693FrameEOF
+// buffers
+#define ISO15693_DMA_BUFFER_SIZE 256 // must be a power of 2
+#define ISO15693_MAX_RESPONSE_LENGTH 36 // allows read single block with the maximum block size of 256bits. Read multiple blocks not supported yet
+#define ISO15693_MAX_COMMAND_LENGTH 45 // allows write single block with the maximum block size of 256bits. Write multiple blocks not supported yet
-#define Crc(data,datalen) Iso15693Crc(data,datalen)
-#define AddCrc(data,datalen) Iso15693AddCrc(data,datalen)
-#define sprintUID(target,uid) Iso15693sprintUID(target,uid)
-// approximate amplitude=sqrt(ci^2+cq^2)
-#define AMPLITUDE(ci, cq) (MAX(ABS(ci), ABS(cq)) + MIN(ABS(ci), ABS(cq))/2)
+// specific LogTrace function for ISO15693: the duration needs to be scaled because otherwise it won't fit into a uint16_t
+bool LogTrace_ISO15693(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag) {
+ uint32_t duration = timestamp_end - timestamp_start;
+ duration /= 32;
+ timestamp_end = timestamp_start + duration;
+ return LogTrace(btBytes, iLen, timestamp_start, timestamp_end, parity, readerToTag);
+}
-// DMA buffer
-#define ISO15693_DMA_BUFFER_SIZE 128
// ---------------------------
-// Signal Processing
+// Signal Processing
// ---------------------------
// prepare data using "1 out of 4" code for later transmission
-// resulting data rate is 26,48 kbit/s (fc/512)
+// resulting data rate is 26.48 kbit/s (fc/512)
// cmd ... data
// n ... length of data
-static void CodeIso15693AsReader(uint8_t *cmd, int n)
-{
- int i, j;
+void CodeIso15693AsReader(uint8_t *cmd, int n) {
ToSendReset();
- // Give it a bit of slack at the beginning
- for(i = 0; i < 24; i++) {
- ToSendStuffBit(1);
- }
-
// SOF for 1of4
- ToSendStuffBit(0);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(0);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- for(i = 0; i < n; i++) {
- for(j = 0; j < 8; j += 2) {
- int these = (cmd[i] >> j) & 3;
+ ToSend[++ToSendMax] = 0x84; //10000100
+
+ // data
+ for (int i = 0; i < n; i++) {
+ for (int j = 0; j < 8; j += 2) {
+ int these = (cmd[i] >> j) & 0x03;
switch(these) {
case 0:
- ToSendStuffBit(1);
- ToSendStuffBit(0);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
+ ToSend[++ToSendMax] = 0x40; //01000000
break;
case 1:
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(0);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
+ ToSend[++ToSendMax] = 0x10; //00010000
break;
case 2:
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(0);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
+ ToSend[++ToSendMax] = 0x04; //00000100
break;
case 3:
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(0);
+ ToSend[++ToSendMax] = 0x01; //00000001
break;
}
}
}
+
// EOF
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(0);
- ToSendStuffBit(1);
-
- // Fill remainder of last byte with 1
- for(i = 0; i < 4; i++) {
- ToSendStuffBit(1);
- }
-
+ ToSend[++ToSendMax] = 0x20; //0010 + 0000 padding
+
ToSendMax++;
}
+
+// Encode EOF only
+static void CodeIso15693AsReaderEOF() {
+ ToSendReset();
+ ToSend[++ToSendMax] = 0x20;
+ ToSendMax++;
+}
+
+
// encode data using "1 out of 256" scheme
-// data rate is 1,66 kbit/s (fc/8192)
+// data rate is 1,66 kbit/s (fc/8192)
// is designed for more robust communication over longer distances
static void CodeIso15693AsReader256(uint8_t *cmd, int n)
{
- int i, j;
-
ToSendReset();
- // Give it a bit of slack at the beginning
- for(i = 0; i < 24; i++) {
- ToSendStuffBit(1);
- }
-
// SOF for 1of256
- ToSendStuffBit(0);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(0);
-
- for(i = 0; i < n; i++) {
- for (j = 0; j<=255; j++) {
- if (cmd[i]==j) {
- ToSendStuffBit(1);
+ ToSend[++ToSendMax] = 0x81; //10000001
+
+ // data
+ for(int i = 0; i < n; i++) {
+ for (int j = 0; j <= 255; j++) {
+ if (cmd[i] == j) {
ToSendStuffBit(0);
- } else {
ToSendStuffBit(1);
- ToSendStuffBit(1);
- }
- }
+ } else {
+ ToSendStuffBit(0);
+ ToSendStuffBit(0);
+ }
+ }
}
+
// EOF
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(0);
- ToSendStuffBit(1);
-
- // And slack at the end, too.
- for(i = 0; i < 24; i++) {
- ToSendStuffBit(1);
+ ToSend[++ToSendMax] = 0x20; //0010 + 0000 padding
+
+ ToSendMax++;
+}
+
+
+// static uint8_t encode4Bits(const uint8_t b) {
+ // uint8_t c = b & 0xF;
+ // // OTA, the least significant bits first
+ // // The columns are
+ // // 1 - Bit value to send
+ // // 2 - Reversed (big-endian)
+ // // 3 - Manchester Encoded
+ // // 4 - Hex values
+
+ // switch(c){
+ // // 1 2 3 4
+ // case 15: return 0x55; // 1111 -> 1111 -> 01010101 -> 0x55
+ // case 14: return 0x95; // 1110 -> 0111 -> 10010101 -> 0x95
+ // case 13: return 0x65; // 1101 -> 1011 -> 01100101 -> 0x65
+ // case 12: return 0xa5; // 1100 -> 0011 -> 10100101 -> 0xa5
+ // case 11: return 0x59; // 1011 -> 1101 -> 01011001 -> 0x59
+ // case 10: return 0x99; // 1010 -> 0101 -> 10011001 -> 0x99
+ // case 9: return 0x69; // 1001 -> 1001 -> 01101001 -> 0x69
+ // case 8: return 0xa9; // 1000 -> 0001 -> 10101001 -> 0xa9
+ // case 7: return 0x56; // 0111 -> 1110 -> 01010110 -> 0x56
+ // case 6: return 0x96; // 0110 -> 0110 -> 10010110 -> 0x96
+ // case 5: return 0x66; // 0101 -> 1010 -> 01100110 -> 0x66
+ // case 4: return 0xa6; // 0100 -> 0010 -> 10100110 -> 0xa6
+ // case 3: return 0x5a; // 0011 -> 1100 -> 01011010 -> 0x5a
+ // case 2: return 0x9a; // 0010 -> 0100 -> 10011010 -> 0x9a
+ // case 1: return 0x6a; // 0001 -> 1000 -> 01101010 -> 0x6a
+ // default: return 0xaa; // 0000 -> 0000 -> 10101010 -> 0xaa
+
+ // }
+// }
+
+static const uint8_t encode_4bits[16] = { 0xaa, 0x6a, 0x9a, 0x5a, 0xa6, 0x66, 0x96, 0x56, 0xa9, 0x69, 0x99, 0x59, 0xa5, 0x65, 0x95, 0x55 };
+
+void CodeIso15693AsTag(uint8_t *cmd, size_t len) {
+ /*
+ * SOF comprises 3 parts;
+ * * An unmodulated time of 56.64 us
+ * * 24 pulses of 423.75 kHz (fc/32)
+ * * A logic 1, which starts with an unmodulated time of 18.88us
+ * followed by 8 pulses of 423.75kHz (fc/32)
+ *
+ * EOF comprises 3 parts:
+ * - A logic 0 (which starts with 8 pulses of fc/32 followed by an unmodulated
+ * time of 18.88us.
+ * - 24 pulses of fc/32
+ * - An unmodulated time of 56.64 us
+ *
+ * A logic 0 starts with 8 pulses of fc/32
+ * followed by an unmodulated time of 256/fc (~18,88us).
+ *
+ * A logic 0 starts with unmodulated time of 256/fc (~18,88us) followed by
+ * 8 pulses of fc/32 (also 18.88us)
+ *
+ * A bit here becomes 8 pulses of fc/32. Therefore:
+ * The SOF can be written as 00011101 = 0x1D
+ * The EOF can be written as 10111000 = 0xb8
+ * A logic 1 is 01
+ * A logic 0 is 10
+ *
+ * */
+
+ ToSendReset();
+
+ // SOF
+ ToSend[++ToSendMax] = 0x1D; // 00011101
+
+ // data
+ for (int i = 0; i < len; i++) {
+ ToSend[++ToSendMax] = encode_4bits[cmd[i] & 0xF];
+ ToSend[++ToSendMax] = encode_4bits[cmd[i] >> 4];
}
+
+ // EOF
+ ToSend[++ToSendMax] = 0xB8; // 10111000
+
+ ToSendMax++;
}
// Transmit the command (to the tag) that was placed in cmd[].
-static void TransmitTo15693Tag(const uint8_t *cmd, int len)
-{
- FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX);
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
+void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t *start_time) {
+
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_FULL_MOD);
+
+ if (*start_time < DELAY_ARM_TO_TAG) {
+ *start_time = DELAY_ARM_TO_TAG;
+ }
+
+ *start_time = (*start_time - DELAY_ARM_TO_TAG) & 0xfffffff0;
+
+ if (GetCountSspClk() > *start_time) { // we may miss the intended time
+ *start_time = (GetCountSspClk() + 16) & 0xfffffff0; // next possible time
+ }
+
+ while (GetCountSspClk() < *start_time)
+ /* wait */ ;
LED_B_ON();
- for(int c = 0; c < len; ) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = ~cmd[c];
- c++;
- }
- WDT_HIT();
- }
+ for (int c = 0; c < len; c++) {
+ uint8_t data = cmd[c];
+ for (int i = 0; i < 8; i++) {
+ uint16_t send_word = (data & 0x80) ? 0xffff : 0x0000;
+ while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ;
+ AT91C_BASE_SSC->SSC_THR = send_word;
+ while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ;
+ AT91C_BASE_SSC->SSC_THR = send_word;
+ data <<= 1;
+ }
+ WDT_HIT();
+ }
LED_B_OFF();
+
+ *start_time = *start_time + DELAY_ARM_TO_TAG;
}
+
//-----------------------------------------------------------------------------
-// Transmit the command (to the reader) that was placed in cmd[].
+// Transmit the tag response (to the reader) that was placed in cmd[].
//-----------------------------------------------------------------------------
-static void TransmitTo15693Reader(const uint8_t *cmd, int len)
-{
+void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t *start_time, uint32_t slot_time, bool slow) {
+ // don't use the FPGA_HF_SIMULATOR_MODULATE_424K_8BIT minor mode. It would spoil GetCountSspClk()
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_424K);
+ uint32_t modulation_start_time = *start_time - DELAY_ARM_TO_READER + 3 * 8; // no need to transfer the unmodulated start of SOF
+
+ while (GetCountSspClk() > (modulation_start_time & 0xfffffff8) + 3) { // we will miss the intended time
+ if (slot_time) {
+ modulation_start_time += slot_time; // use next available slot
+ } else {
+ modulation_start_time = (modulation_start_time & 0xfffffff8) + 8; // next possible time
+ }
+ }
+
+ while (GetCountSspClk() < (modulation_start_time & 0xfffffff8))
+ /* wait */ ;
+
+ uint8_t shift_delay = modulation_start_time & 0x00000007;
+
+ *start_time = modulation_start_time + DELAY_ARM_TO_READER - 3 * 8;
+
LED_C_ON();
- for(int c = 0; c < len; ) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = cmd[c];
- c++;
- }
- WDT_HIT();
- }
+ uint8_t bits_to_shift = 0x00;
+ uint8_t bits_to_send = 0x00;
+ for (size_t c = 0; c < len; c++) {
+ for (int i = (c==0?4:7); i >= 0; i--) {
+ uint8_t cmd_bits = ((cmd[c] >> i) & 0x01) ? 0xff : 0x00;
+ for (int j = 0; j < (slow?4:1); ) {
+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
+ bits_to_send = bits_to_shift << (8 - shift_delay) | cmd_bits >> shift_delay;
+ AT91C_BASE_SSC->SSC_THR = bits_to_send;
+ bits_to_shift = cmd_bits;
+ j++;
+ }
+ }
+ }
+ WDT_HIT();
+ }
+ // send the remaining bits, padded with 0:
+ bits_to_send = bits_to_shift << (8 - shift_delay);
+ for ( ; ; ) {
+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
+ AT91C_BASE_SSC->SSC_THR = bits_to_send;
+ break;
+ }
+ }
LED_C_OFF();
}
//=============================================================================
-// An ISO 15693 demodulator (one subcarrier only). Uses cross correlation to
-// identify the SOF, each bit, and EOF.
+// An ISO 15693 decoder for tag responses (one subcarrier only).
+// Uses cross correlation to identify each bit and EOF.
// This function is called 8 times per bit (every 2 subcarrier cycles).
-// Subcarrier frequency fs is 424kHz, 1/fs = 2,36us,
+// Subcarrier frequency fs is 424kHz, 1/fs = 2,36us,
// i.e. function is called every 4,72us
// LED handling:
// LED C -> ON once we have received the SOF and are expecting the rest.
// false if we are still waiting for some more
//=============================================================================
-#define SUBCARRIER_DETECT_THRESHOLD 2
-#define SOF_CORRELATOR_LEN (1<<5)
+#define NOISE_THRESHOLD 80 // don't try to correlate noise
+#define MAX_PREVIOUS_AMPLITUDE (-1 - NOISE_THRESHOLD)
-typedef struct Demod {
+typedef struct DecodeTag {
enum {
- DEMOD_UNSYNCD,
- DEMOD_AWAIT_SOF_1,
- DEMOD_AWAIT_SOF_2,
- DEMOD_RECEIVING_DATA,
- DEMOD_AWAIT_EOF
+ STATE_TAG_SOF_LOW,
+ STATE_TAG_SOF_RISING_EDGE,
+ STATE_TAG_SOF_HIGH,
+ STATE_TAG_SOF_HIGH_END,
+ STATE_TAG_RECEIVING_DATA,
+ STATE_TAG_EOF,
+ STATE_TAG_EOF_TAIL
} state;
int bitCount;
int posCount;
SOF_PART2
} lastBit;
uint16_t shiftReg;
+ uint16_t max_len;
uint8_t *output;
int len;
int sum1, sum2;
- uint8_t SOF_low;
- uint8_t SOF_high;
- uint8_t SOF_last;
- int32_t SOF_corr;
- int32_t SOF_corr_prev;
- uint8_t SOF_correlator[SOF_CORRELATOR_LEN];
-} Demod_t;
-
-static RAMFUNC int Handle15693SamplesDemod(int8_t ci, int8_t cq, Demod_t *Demod)
-{
- switch(Demod->state) {
- case DEMOD_UNSYNCD:
- // initialize SOF correlator. We are looking for 12 samples low and 12 samples high.
- Demod->SOF_low = 0;
- Demod->SOF_high = 12;
- Demod->SOF_last = 23;
- memset(Demod->SOF_correlator, 0x00, Demod->SOF_last + 1);
- Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq);
- Demod->SOF_corr = Demod->SOF_correlator[Demod->SOF_last];
- Demod->SOF_corr_prev = Demod->SOF_corr;
- // initialize Demodulator
- Demod->posCount = 0;
- Demod->bitCount = 0;
- Demod->len = 0;
- Demod->state = DEMOD_AWAIT_SOF_1;
+ int threshold_sof;
+ int threshold_half;
+ uint16_t previous_amplitude;
+} DecodeTag_t;
+
+
+static int inline __attribute__((always_inline)) Handle15693SamplesFromTag(uint16_t amplitude, DecodeTag_t *DecodeTag) {
+ switch (DecodeTag->state) {
+ case STATE_TAG_SOF_LOW:
+ // waiting for a rising edge
+ if (amplitude > NOISE_THRESHOLD + DecodeTag->previous_amplitude) {
+ if (DecodeTag->posCount > 10) {
+ DecodeTag->threshold_sof = amplitude - DecodeTag->previous_amplitude; // to be divided by 2
+ DecodeTag->threshold_half = 0;
+ DecodeTag->state = STATE_TAG_SOF_RISING_EDGE;
+ } else {
+ DecodeTag->posCount = 0;
+ }
+ } else {
+ DecodeTag->posCount++;
+ DecodeTag->previous_amplitude = amplitude;
+ }
break;
-
- case DEMOD_AWAIT_SOF_1:
- // calculate the correlation in real time. Look at differences only.
- Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_low++];
- Demod->SOF_corr -= 2*Demod->SOF_correlator[Demod->SOF_high++];
- Demod->SOF_last++;
- Demod->SOF_low &= (SOF_CORRELATOR_LEN-1);
- Demod->SOF_high &= (SOF_CORRELATOR_LEN-1);
- Demod->SOF_last &= (SOF_CORRELATOR_LEN-1);
- Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq);
- Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_last];
-
- // if correlation increases for 10 consecutive samples, we are close to maximum correlation
- if (Demod->SOF_corr > Demod->SOF_corr_prev + SUBCARRIER_DETECT_THRESHOLD) {
- Demod->posCount++;
+
+ case STATE_TAG_SOF_RISING_EDGE:
+ if (amplitude > DecodeTag->threshold_sof + DecodeTag->previous_amplitude) { // edge still rising
+ if (amplitude > DecodeTag->threshold_sof + DecodeTag->threshold_sof) { // steeper edge, take this as time reference
+ DecodeTag->posCount = 1;
+ } else {
+ DecodeTag->posCount = 2;
+ }
+ DecodeTag->threshold_sof = (amplitude - DecodeTag->previous_amplitude) / 2;
} else {
- Demod->posCount = 0;
+ DecodeTag->posCount = 2;
+ DecodeTag->threshold_sof = DecodeTag->threshold_sof/2;
}
+ // DecodeTag->posCount = 2;
+ DecodeTag->state = STATE_TAG_SOF_HIGH;
+ break;
- if (Demod->posCount == 10) { // correlation increased 10 times
- Demod->state = DEMOD_AWAIT_SOF_2;
+ case STATE_TAG_SOF_HIGH:
+ // waiting for 10 times high. Take average over the last 8
+ if (amplitude > DecodeTag->threshold_sof) {
+ DecodeTag->posCount++;
+ if (DecodeTag->posCount > 2) {
+ DecodeTag->threshold_half += amplitude; // keep track of average high value
+ }
+ if (DecodeTag->posCount == 10) {
+ DecodeTag->threshold_half >>= 2; // (4 times 1/2 average)
+ DecodeTag->state = STATE_TAG_SOF_HIGH_END;
+ }
+ } else { // high phase was too short
+ DecodeTag->posCount = 1;
+ DecodeTag->previous_amplitude = amplitude;
+ DecodeTag->state = STATE_TAG_SOF_LOW;
}
-
- Demod->SOF_corr_prev = Demod->SOF_corr;
-
break;
- case DEMOD_AWAIT_SOF_2:
- // calculate the correlation in real time. Look at differences only.
- Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_low++];
- Demod->SOF_corr -= 2*Demod->SOF_correlator[Demod->SOF_high++];
- Demod->SOF_last++;
- Demod->SOF_low &= (SOF_CORRELATOR_LEN-1);
- Demod->SOF_high &= (SOF_CORRELATOR_LEN-1);
- Demod->SOF_last &= (SOF_CORRELATOR_LEN-1);
- Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq);
- Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_last];
-
- if (Demod->SOF_corr >= Demod->SOF_corr_prev) { // we are looking for the maximum correlation
- Demod->SOF_corr_prev = Demod->SOF_corr;
- } else {
- Demod->lastBit = SOF_PART1; // detected 1st part of SOF
- Demod->sum1 = Demod->SOF_correlator[Demod->SOF_last];
- Demod->sum2 = 0;
- Demod->posCount = 2;
- Demod->state = DEMOD_RECEIVING_DATA;
+ case STATE_TAG_SOF_HIGH_END:
+ // check for falling edge
+ if (DecodeTag->posCount == 13 && amplitude < DecodeTag->threshold_sof) {
+ DecodeTag->lastBit = SOF_PART1; // detected 1st part of SOF (12 samples low and 12 samples high)
+ DecodeTag->shiftReg = 0;
+ DecodeTag->bitCount = 0;
+ DecodeTag->len = 0;
+ DecodeTag->sum1 = amplitude;
+ DecodeTag->sum2 = 0;
+ DecodeTag->posCount = 2;
+ DecodeTag->state = STATE_TAG_RECEIVING_DATA;
+ // FpgaDisableTracing(); // DEBUGGING
+ // Dbprintf("amplitude = %d, threshold_sof = %d, threshold_half/4 = %d, previous_amplitude = %d",
+ // amplitude,
+ // DecodeTag->threshold_sof,
+ // DecodeTag->threshold_half/4,
+ // DecodeTag->previous_amplitude); // DEBUGGING
LED_C_ON();
+ } else {
+ DecodeTag->posCount++;
+ if (DecodeTag->posCount > 13) { // high phase too long
+ DecodeTag->posCount = 0;
+ DecodeTag->previous_amplitude = amplitude;
+ DecodeTag->state = STATE_TAG_SOF_LOW;
+ LED_C_OFF();
+ }
}
-
break;
- case DEMOD_RECEIVING_DATA:
- if (Demod->posCount == 1) {
- Demod->sum1 = 0;
- Demod->sum2 = 0;
+ case STATE_TAG_RECEIVING_DATA:
+ // FpgaDisableTracing(); // DEBUGGING
+ // Dbprintf("amplitude = %d, threshold_sof = %d, threshold_half/4 = %d, previous_amplitude = %d",
+ // amplitude,
+ // DecodeTag->threshold_sof,
+ // DecodeTag->threshold_half/4,
+ // DecodeTag->previous_amplitude); // DEBUGGING
+ if (DecodeTag->posCount == 1) {
+ DecodeTag->sum1 = 0;
+ DecodeTag->sum2 = 0;
}
-
- if (Demod->posCount <= 4) {
- Demod->sum1 += AMPLITUDE(ci, cq);
+ if (DecodeTag->posCount <= 4) {
+ DecodeTag->sum1 += amplitude;
} else {
- Demod->sum2 += AMPLITUDE(ci, cq);
+ DecodeTag->sum2 += amplitude;
}
-
- if (Demod->posCount == 8) {
- int16_t corr_1 = (Demod->sum2 - Demod->sum1) / 4;
- int16_t corr_0 = (Demod->sum1 - Demod->sum2) / 4;
- int16_t corr_EOF = (Demod->sum1 + Demod->sum2) / 8;
- if (corr_EOF > corr_0 && corr_EOF > corr_1) {
- Demod->state = DEMOD_AWAIT_EOF;
- } else if (corr_1 > corr_0) {
+ if (DecodeTag->posCount == 8) {
+ if (DecodeTag->sum1 > DecodeTag->threshold_half && DecodeTag->sum2 > DecodeTag->threshold_half) { // modulation in both halves
+ if (DecodeTag->lastBit == LOGIC0) { // this was already part of EOF
+ DecodeTag->state = STATE_TAG_EOF;
+ } else {
+ DecodeTag->posCount = 0;
+ DecodeTag->previous_amplitude = amplitude;
+ DecodeTag->state = STATE_TAG_SOF_LOW;
+ LED_C_OFF();
+ }
+ } else if (DecodeTag->sum1 < DecodeTag->threshold_half && DecodeTag->sum2 > DecodeTag->threshold_half) { // modulation in second half
// logic 1
- if (Demod->lastBit == SOF_PART1) { // still part of SOF
- Demod->lastBit = SOF_PART2;
+ if (DecodeTag->lastBit == SOF_PART1) { // still part of SOF
+ DecodeTag->lastBit = SOF_PART2; // SOF completed
} else {
- Demod->lastBit = LOGIC1;
- Demod->shiftReg >>= 1;
- Demod->shiftReg |= 0x80;
- Demod->bitCount++;
- if (Demod->bitCount == 8) {
- Demod->output[Demod->len] = Demod->shiftReg;
- Demod->len++;
- Demod->bitCount = 0;
- Demod->shiftReg = 0;
+ DecodeTag->lastBit = LOGIC1;
+ DecodeTag->shiftReg >>= 1;
+ DecodeTag->shiftReg |= 0x80;
+ DecodeTag->bitCount++;
+ if (DecodeTag->bitCount == 8) {
+ DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg;
+ DecodeTag->len++;
+ // if (DecodeTag->shiftReg == 0x12 && DecodeTag->len == 1) FpgaDisableTracing(); // DEBUGGING
+ if (DecodeTag->len > DecodeTag->max_len) {
+ // buffer overflow, give up
+ LED_C_OFF();
+ return true;
+ }
+ DecodeTag->bitCount = 0;
+ DecodeTag->shiftReg = 0;
}
}
- } else {
+ } else if (DecodeTag->sum1 > DecodeTag->threshold_half && DecodeTag->sum2 < DecodeTag->threshold_half) { // modulation in first half
// logic 0
- if (Demod->lastBit == SOF_PART1) { // incomplete SOF
- Demod->state = DEMOD_UNSYNCD;
+ if (DecodeTag->lastBit == SOF_PART1) { // incomplete SOF
+ DecodeTag->posCount = 0;
+ DecodeTag->previous_amplitude = amplitude;
+ DecodeTag->state = STATE_TAG_SOF_LOW;
LED_C_OFF();
} else {
- Demod->lastBit = LOGIC0;
- Demod->shiftReg >>= 1;
- Demod->bitCount++;
- if (Demod->bitCount == 8) {
- Demod->output[Demod->len] = Demod->shiftReg;
- Demod->len++;
- Demod->bitCount = 0;
- Demod->shiftReg = 0;
+ DecodeTag->lastBit = LOGIC0;
+ DecodeTag->shiftReg >>= 1;
+ DecodeTag->bitCount++;
+ if (DecodeTag->bitCount == 8) {
+ DecodeTag->output[DecodeTag->len] = DecodeTag->shiftReg;
+ DecodeTag->len++;
+ // if (DecodeTag->shiftReg == 0x12 && DecodeTag->len == 1) FpgaDisableTracing(); // DEBUGGING
+ if (DecodeTag->len > DecodeTag->max_len) {
+ // buffer overflow, give up
+ DecodeTag->posCount = 0;
+ DecodeTag->previous_amplitude = amplitude;
+ DecodeTag->state = STATE_TAG_SOF_LOW;
+ LED_C_OFF();
+ }
+ DecodeTag->bitCount = 0;
+ DecodeTag->shiftReg = 0;
}
}
+ } else { // no modulation
+ if (DecodeTag->lastBit == SOF_PART2) { // only SOF (this is OK for iClass)
+ LED_C_OFF();
+ return true;
+ } else {
+ DecodeTag->posCount = 0;
+ DecodeTag->state = STATE_TAG_SOF_LOW;
+ LED_C_OFF();
+ }
}
- Demod->posCount = 0;
+ DecodeTag->posCount = 0;
}
- Demod->posCount++;
+ DecodeTag->posCount++;
break;
-
- case DEMOD_AWAIT_EOF:
- if (Demod->lastBit == LOGIC0) { // this was already part of EOF
- LED_C_OFF();
- return true;
+
+ case STATE_TAG_EOF:
+ if (DecodeTag->posCount == 1) {
+ DecodeTag->sum1 = 0;
+ DecodeTag->sum2 = 0;
+ }
+ if (DecodeTag->posCount <= 4) {
+ DecodeTag->sum1 += amplitude;
} else {
- Demod->state = DEMOD_UNSYNCD;
- LED_C_OFF();
+ DecodeTag->sum2 += amplitude;
}
+ if (DecodeTag->posCount == 8) {
+ if (DecodeTag->sum1 > DecodeTag->threshold_half && DecodeTag->sum2 < DecodeTag->threshold_half) { // modulation in first half
+ DecodeTag->posCount = 0;
+ DecodeTag->state = STATE_TAG_EOF_TAIL;
+ } else {
+ DecodeTag->posCount = 0;
+ DecodeTag->previous_amplitude = amplitude;
+ DecodeTag->state = STATE_TAG_SOF_LOW;
+ LED_C_OFF();
+ }
+ }
+ DecodeTag->posCount++;
break;
- default:
- Demod->state = DEMOD_UNSYNCD;
- LED_C_OFF();
+ case STATE_TAG_EOF_TAIL:
+ if (DecodeTag->posCount == 1) {
+ DecodeTag->sum1 = 0;
+ DecodeTag->sum2 = 0;
+ }
+ if (DecodeTag->posCount <= 4) {
+ DecodeTag->sum1 += amplitude;
+ } else {
+ DecodeTag->sum2 += amplitude;
+ }
+ if (DecodeTag->posCount == 8) {
+ if (DecodeTag->sum1 < DecodeTag->threshold_half && DecodeTag->sum2 < DecodeTag->threshold_half) { // no modulation in both halves
+ LED_C_OFF();
+ return true;
+ } else {
+ DecodeTag->posCount = 0;
+ DecodeTag->previous_amplitude = amplitude;
+ DecodeTag->state = STATE_TAG_SOF_LOW;
+ LED_C_OFF();
+ }
+ }
+ DecodeTag->posCount++;
break;
}
}
-static void DemodInit(Demod_t* Demod, uint8_t* data)
-{
- Demod->output = data;
- Demod->state = DEMOD_UNSYNCD;
+static void DecodeTagInit(DecodeTag_t *DecodeTag, uint8_t *data, uint16_t max_len) {
+ DecodeTag->previous_amplitude = MAX_PREVIOUS_AMPLITUDE;
+ DecodeTag->posCount = 0;
+ DecodeTag->state = STATE_TAG_SOF_LOW;
+ DecodeTag->output = data;
+ DecodeTag->max_len = max_len;
+}
+
+
+static void DecodeTagReset(DecodeTag_t *DecodeTag) {
+ DecodeTag->posCount = 0;
+ DecodeTag->state = STATE_TAG_SOF_LOW;
+ DecodeTag->previous_amplitude = MAX_PREVIOUS_AMPLITUDE;
}
/*
- * Demodulate the samples we received from the tag, also log to tracebuffer
+ * Receive and decode the tag response, also log to tracebuffer
*/
-static int GetIso15693AnswerFromTag(uint8_t* response, int timeout)
-{
- int maxBehindBy = 0;
- int lastRxCounter, samples = 0;
- int8_t ci, cq;
- bool gotFrame = false;
-
- // Allocate memory from BigBuf for some buffers
- // free all previous allocations first
- BigBuf_free();
+int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, uint16_t timeout, uint32_t *eof_time) {
- // The DMA buffer, used to stream samples from the FPGA
- uint16_t* dmaBuf = (uint16_t*) BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE * sizeof(uint16_t));
+ int samples = 0;
+ int ret = 0;
- // the Demodulatur data structure
- Demod_t* Demod = (Demod_t*) BigBuf_malloc(sizeof(Demod_t));
-
- // Set up the demodulator for tag -> reader responses.
- DemodInit(Demod, response);
+ uint16_t dmaBuf[ISO15693_DMA_BUFFER_SIZE];
+
+ // the Decoder data structure
+ DecodeTag_t DecodeTag = { 0 };
+ DecodeTagInit(&DecodeTag, response, max_len);
// wait for last transfer to complete
while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY));
// And put the FPGA in the appropriate mode
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_SUBCARRIER_424_KHZ | FPGA_HF_READER_MODE_RECEIVE_AMPLITUDE);
// Setup and start DMA.
- FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+ FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER);
FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
-
+ uint32_t dma_start_time = 0;
uint16_t *upTo = dmaBuf;
- lastRxCounter = ISO15693_DMA_BUFFER_SIZE;
for(;;) {
- int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO15693_DMA_BUFFER_SIZE-1);
- if(behindBy > maxBehindBy) {
- maxBehindBy = behindBy;
+ uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1);
+
+ if (behindBy == 0) continue;
+
+ samples++;
+ if (samples == 1) {
+ // DMA has transferred the very first data
+ dma_start_time = GetCountSspClk() & 0xfffffff0;
}
- if (behindBy < 1) continue;
-
- ci = (int8_t)(*upTo >> 8);
- cq = (int8_t)(*upTo & 0xff);
+ uint16_t tagdata = *upTo++;
- upTo++;
- lastRxCounter--;
if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content.
upTo = dmaBuf; // start reading the circular buffer from the beginning
- lastRxCounter += ISO15693_DMA_BUFFER_SIZE;
+ if (behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) {
+ Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy);
+ ret = -1;
+ break;
+ }
}
if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated.
AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and
AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers
}
- samples++;
- if (Handle15693SamplesDemod(ci, cq, Demod)) {
- gotFrame = true;
+ if (Handle15693SamplesFromTag(tagdata, &DecodeTag)) {
+ *eof_time = dma_start_time + samples*16 - DELAY_TAG_TO_ARM; // end of EOF
+ if (DecodeTag.lastBit == SOF_PART2) {
+ *eof_time -= 8*16; // needed 8 additional samples to confirm single SOF (iCLASS)
+ }
+ if (DecodeTag.len > DecodeTag.max_len) {
+ ret = -2; // buffer overflow
+ }
break;
}
- if(samples > timeout && Demod->state < DEMOD_RECEIVING_DATA) {
- Demod->len = 0;
+ if (samples > timeout && DecodeTag.state < STATE_TAG_RECEIVING_DATA) {
+ ret = -1; // timeout
break;
}
+
}
FpgaDisableSscDma();
- if (DEBUG) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.state = %d, Demod.len = %d, Demod.bitCount = %d, Demod.posCount = %d",
- maxBehindBy, samples, gotFrame, Demod->state, Demod->len, Demod->bitCount, Demod->posCount);
+ if (DEBUG) Dbprintf("samples = %d, ret = %d, Decoder: state = %d, lastBit = %d, len = %d, bitCount = %d, posCount = %d",
+ samples, ret, DecodeTag.state, DecodeTag.lastBit, DecodeTag.len, DecodeTag.bitCount, DecodeTag.posCount);
- if (tracing && Demod->len > 0) {
- uint8_t parity[MAX_PARITY_SIZE];
- LogTrace(Demod->output, Demod->len, 0, 0, parity, false);
+ if (ret < 0) {
+ return ret;
}
- return Demod->len;
+ uint32_t sof_time = *eof_time
+ - DecodeTag.len * 8 * 8 * 16 // time for byte transfers
+ - 32 * 16 // time for SOF transfer
+ - (DecodeTag.lastBit != SOF_PART2?32*16:0); // time for EOF transfer
+
+ if (DEBUG) Dbprintf("timing: sof_time = %d, eof_time = %d", sof_time, *eof_time);
+
+ LogTrace_ISO15693(DecodeTag.output, DecodeTag.len, sof_time*4, *eof_time*4, NULL, false);
+
+ return DecodeTag.len;
}
-// Now the GetISO15693 message from sniffing command
-// TODO: fix it. This cannot work for several reasons:
-// 1. Carrier is switched on during sniffing?
-// 2. We most probable miss the next reader command when demodulating
-static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed)
-{
- uint8_t *dest = BigBuf_get_addr();
+//=============================================================================
+// An ISO15693 decoder for reader commands.
+//
+// This function is called 4 times per bit (every 2 subcarrier cycles).
+// Subcarrier frequency fs is 848kHz, 1/fs = 1,18us, i.e. function is called every 2,36us
+// LED handling:
+// LED B -> ON once we have received the SOF and are expecting the rest.
+// LED B -> OFF once we have received EOF or are in error state or unsynced
+//
+// Returns: true if we received a EOF
+// false if we are still waiting for some more
+//=============================================================================
-// NOW READ RESPONSE
- LED_D_ON();
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
- //spindelay(60); // greg - experiment to get rid of some of the 0 byte/failed reads
- for(int c = 0; c < BIGBUF_SIZE; ) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- uint16_t iq = AT91C_BASE_SSC->SSC_RHR;
- // The samples are correlations against I and Q versions of the
- // tone that the tag AM-modulates. We just want power,
- // so abs(I) + abs(Q) is close to what we want.
- int8_t i = (int8_t)(iq >> 8);
- int8_t q = (int8_t)(iq & 0xff);
- uint8_t r = AMPLITUDE(i, q);
- dest[c++] = r;
- }
- }
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- LED_D_OFF();
+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,
+ STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4,
+ STATE_READER_RECEIVE_DATA_1_OUT_OF_4,
+ STATE_READER_RECEIVE_DATA_1_OUT_OF_256,
+ STATE_READER_RECEIVE_JAMMING
+ } state;
+ enum {
+ CODING_1_OUT_OF_4,
+ CODING_1_OUT_OF_256
+ } Coding;
+ uint8_t shiftReg;
+ uint8_t bitCount;
+ int byteCount;
+ int byteCountMax;
+ int posCount;
+ int sum1, sum2;
+ uint8_t *output;
+ uint8_t jam_search_len;
+ uint8_t *jam_search_string;
+} DecodeReader_t;
+
+
+static void DecodeReaderInit(DecodeReader_t* DecodeReader, uint8_t *data, uint16_t max_len, uint8_t jam_search_len, uint8_t *jam_search_string) {
+ DecodeReader->output = data;
+ DecodeReader->byteCountMax = max_len;
+ DecodeReader->state = STATE_READER_UNSYNCD;
+ DecodeReader->byteCount = 0;
+ DecodeReader->bitCount = 0;
+ DecodeReader->posCount = 1;
+ DecodeReader->shiftReg = 0;
+ DecodeReader->jam_search_len = jam_search_len;
+ DecodeReader->jam_search_string = jam_search_string;
+}
- //////////////////////////////////////////
- /////////// DEMODULATE ///////////////////
- //////////////////////////////////////////
- int i, j;
- int max = 0, maxPos=0;
+static void DecodeReaderReset(DecodeReader_t* DecodeReader) {
+ DecodeReader->state = STATE_READER_UNSYNCD;
+}
- int skip = 2;
- // First, correlate for SOF
- for(i = 0; i < 38000; i++) {
- int corr = 0;
- for(j = 0; j < arraylen(FrameSOF); j += skip) {
- corr += FrameSOF[j]*dest[i+(j/skip)];
- }
- if(corr > max) {
- max = corr;
- maxPos = i;
- }
- }
+static int inline __attribute__((always_inline)) Handle15693SampleFromReader(bool bit, DecodeReader_t *DecodeReader) {
+ switch (DecodeReader->state) {
+ case STATE_READER_UNSYNCD:
+ // wait for unmodulated carrier
+ if (bit) {
+ DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF;
+ }
+ break;
- if (DEBUG) Dbprintf("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip));
+ 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;
+ DecodeReader->state = STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF;
+ }
+ break;
- int k = 0; // this will be our return value
+ case STATE_READER_AWAIT_1ST_RISING_EDGE_OF_SOF:
+ DecodeReader->posCount++;
+ if (bit) { // detected rising edge
+ if (DecodeReader->posCount < 4) { // rising edge too early (nominally expected at 5)
+ DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF;
+ } else { // SOF
+ DecodeReader->state = STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF;
+ }
+ } else {
+ if (DecodeReader->posCount > 5) { // stayed low for too long
+ DecodeReaderReset(DecodeReader);
+ } else {
+ // do nothing, keep waiting
+ }
+ }
+ break;
- // greg - If correlation is less than 1 then there's little point in continuing
- if ((max/(arraylen(FrameSOF)/skip)) >= 1) // THIS SHOULD BE 1
- {
-
- i = maxPos + arraylen(FrameSOF)/skip;
-
- uint8_t outBuf[20];
- memset(outBuf, 0, sizeof(outBuf));
- uint8_t mask = 0x01;
- for(;;) {
- int corr0 = 0, corr00 = 0, corr01 = 0, corr1 = 0, corrEOF = 0;
- for(j = 0; j < arraylen(Logic0); j += skip) {
- corr0 += Logic0[j]*dest[i+(j/skip)];
+ case STATE_READER_AWAIT_2ND_FALLING_EDGE_OF_SOF:
+ DecodeReader->posCount++;
+ if (!bit) { // detected a falling edge
+ if (DecodeReader->posCount < 20) { // falling edge too early (nominally expected at 21 earliest)
+ DecodeReaderReset(DecodeReader);
+ } else if (DecodeReader->posCount < 23) { // SOF for 1 out of 4 coding
+ DecodeReader->Coding = CODING_1_OUT_OF_4;
+ 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 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
+ DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF;
+ } else {
+ // do nothing, keep waiting
+ }
}
- corr01 = corr00 = corr0;
- for(j = 0; j < arraylen(Logic0); j += skip) {
- corr00 += Logic0[j]*dest[i+arraylen(Logic0)/skip+(j/skip)];
- corr01 += Logic1[j]*dest[i+arraylen(Logic0)/skip+(j/skip)];
+ break;
+
+ case STATE_READER_AWAIT_2ND_RISING_EDGE_OF_SOF:
+ DecodeReader->posCount++;
+ 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)
+ DecodeReader->state = STATE_READER_AWAIT_1ST_FALLING_EDGE_OF_SOF;
+ } else {
+ DecodeReader->posCount = 1;
+ DecodeReader->bitCount = 0;
+ DecodeReader->byteCount = 0;
+ DecodeReader->sum1 = 1;
+ DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_256;
+ LED_B_ON();
+ }
+ } else { // CODING_1_OUT_OF_4
+ if (DecodeReader->posCount < 24) { // rising edge too early (nominally expected at 25)
+ 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);
+ } else {
+ // do nothing, keep waiting
+ }
+ } else { // CODING_1_OUT_OF_4
+ if (DecodeReader->posCount > 26) { // signal stayed low for too long
+ DecodeReaderReset(DecodeReader);
+ } else {
+ // do nothing, keep waiting
+ }
+ }
}
- for(j = 0; j < arraylen(Logic1); j += skip) {
- corr1 += Logic1[j]*dest[i+(j/skip)];
+ break;
+
+ case STATE_READER_AWAIT_END_OF_SOF_1_OUT_OF_4:
+ DecodeReader->posCount++;
+ if (bit) {
+ if (DecodeReader->posCount == 9) {
+ DecodeReader->posCount = 1;
+ DecodeReader->bitCount = 0;
+ DecodeReader->byteCount = 0;
+ DecodeReader->sum1 = 1;
+ DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_4;
+ LED_B_ON();
+ } else {
+ // do nothing, keep waiting
+ }
+ } else { // unexpected falling edge
+ DecodeReaderReset(DecodeReader);
}
- for(j = 0; j < arraylen(FrameEOF); j += skip) {
- corrEOF += FrameEOF[j]*dest[i+(j/skip)];
+ break;
+
+ case STATE_READER_RECEIVE_DATA_1_OUT_OF_4:
+ DecodeReader->posCount++;
+ if (DecodeReader->posCount == 1) {
+ DecodeReader->sum1 = bit?1:0;
+ } else if (DecodeReader->posCount <= 4) {
+ if (bit) DecodeReader->sum1++;
+ } else if (DecodeReader->posCount == 5) {
+ DecodeReader->sum2 = bit?1:0;
+ } else {
+ if (bit) DecodeReader->sum2++;
}
- // Even things out by the length of the target waveform.
- corr00 *= 2;
- corr01 *= 2;
- corr0 *= 4;
- corr1 *= 4;
-
- if(corrEOF > corr1 && corrEOF > corr00 && corrEOF > corr01) {
- if (DEBUG) Dbprintf("EOF at %d, correlation %d (corr01: %d, corr00: %d, corr1: %d, corr0: %d)",
- i, corrEOF, corr01, corr00, corr1, corr0);
- break;
- } else if(corr1 > corr0) {
- i += arraylen(Logic1)/skip;
- outBuf[k] |= mask;
+ if (DecodeReader->posCount == 8) {
+ DecodeReader->posCount = 0;
+ if (DecodeReader->sum1 <= 1 && DecodeReader->sum2 >= 3) { // EOF
+ LED_B_OFF(); // Finished receiving
+ DecodeReaderReset(DecodeReader);
+ if (DecodeReader->byteCount != 0) {
+ return true;
+ }
+ } else if (DecodeReader->sum1 >= 3 && DecodeReader->sum2 <= 1) { // detected a 2bit position
+ DecodeReader->shiftReg >>= 2;
+ DecodeReader->shiftReg |= (DecodeReader->bitCount << 6);
+ }
+ if (DecodeReader->bitCount == 15) { // we have a full byte
+ DecodeReader->output[DecodeReader->byteCount++] = DecodeReader->shiftReg;
+ if (DecodeReader->byteCount > DecodeReader->byteCountMax) {
+ // buffer overflow, give up
+ LED_B_OFF();
+ DecodeReaderReset(DecodeReader);
+ }
+ DecodeReader->bitCount = 0;
+ DecodeReader->shiftReg = 0;
+ if (DecodeReader->byteCount == DecodeReader->jam_search_len) {
+ if (!memcmp(DecodeReader->output, DecodeReader->jam_search_string, DecodeReader->jam_search_len)) {
+ LED_D_ON();
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_JAM);
+ DecodeReader->state = STATE_READER_RECEIVE_JAMMING;
+ }
+ }
+ } else {
+ DecodeReader->bitCount++;
+ }
+ }
+ break;
+
+ case STATE_READER_RECEIVE_DATA_1_OUT_OF_256:
+ DecodeReader->posCount++;
+ if (DecodeReader->posCount == 1) {
+ DecodeReader->sum1 = bit?1:0;
+ } else if (DecodeReader->posCount <= 4) {
+ if (bit) DecodeReader->sum1++;
+ } else if (DecodeReader->posCount == 5) {
+ DecodeReader->sum2 = bit?1:0;
+ } else if (bit) {
+ DecodeReader->sum2++;
+ }
+ if (DecodeReader->posCount == 8) {
+ DecodeReader->posCount = 0;
+ if (DecodeReader->sum1 <= 1 && DecodeReader->sum2 >= 3) { // EOF
+ LED_B_OFF(); // Finished receiving
+ DecodeReaderReset(DecodeReader);
+ if (DecodeReader->byteCount != 0) {
+ return true;
+ }
+ } else if (DecodeReader->sum1 >= 3 && DecodeReader->sum2 <= 1) { // detected the bit position
+ DecodeReader->shiftReg = DecodeReader->bitCount;
+ }
+ if (DecodeReader->bitCount == 255) { // we have a full byte
+ DecodeReader->output[DecodeReader->byteCount++] = DecodeReader->shiftReg;
+ if (DecodeReader->byteCount > DecodeReader->byteCountMax) {
+ // buffer overflow, give up
+ LED_B_OFF();
+ DecodeReaderReset(DecodeReader);
+ }
+ if (DecodeReader->byteCount == DecodeReader->jam_search_len) {
+ if (!memcmp(DecodeReader->output, DecodeReader->jam_search_string, DecodeReader->jam_search_len)) {
+ LED_D_ON();
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_JAM);
+ DecodeReader->state = STATE_READER_RECEIVE_JAMMING;
+ }
+ }
+ }
+ DecodeReader->bitCount++;
+ }
+ break;
+
+ case STATE_READER_RECEIVE_JAMMING:
+ DecodeReader->posCount++;
+ if (DecodeReader->Coding == CODING_1_OUT_OF_4) {
+ if (DecodeReader->posCount == 7*16) { // 7 bits jammed
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SNOOP_AMPLITUDE); // stop jamming
+ // FpgaDisableTracing();
+ LED_D_OFF();
+ } else if (DecodeReader->posCount == 8*16) {
+ DecodeReader->posCount = 0;
+ DecodeReader->output[DecodeReader->byteCount++] = 0x00;
+ DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_4;
+ }
} else {
- i += arraylen(Logic0)/skip;
+ if (DecodeReader->posCount == 7*256) { // 7 bits jammend
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SNOOP_AMPLITUDE); // stop jamming
+ LED_D_OFF();
+ } else if (DecodeReader->posCount == 8*256) {
+ DecodeReader->posCount = 0;
+ DecodeReader->output[DecodeReader->byteCount++] = 0x00;
+ DecodeReader->state = STATE_READER_RECEIVE_DATA_1_OUT_OF_256;
+ }
}
- mask <<= 1;
- if(mask == 0) {
- k++;
- mask = 0x01;
+ break;
+
+ default:
+ LED_B_OFF();
+ DecodeReaderReset(DecodeReader);
+ break;
+ }
+
+ return false;
+}
+
+
+//-----------------------------------------------------------------------------
+// Receive a command (from the reader to us, where we are the simulated tag),
+// and store it in the given buffer, up to the given maximum length. Keeps
+// spinning, waiting for a well-framed command, until either we get one
+// (returns len) or someone presses the pushbutton on the board (returns -1).
+//
+// Assume that we're called with the SSC (to the FPGA) and ADC path set
+// correctly.
+//-----------------------------------------------------------------------------
+
+int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time) {
+ int samples = 0;
+ bool gotFrame = false;
+ uint8_t b;
+
+ uint8_t dmaBuf[ISO15693_DMA_BUFFER_SIZE];
+
+ // the decoder data structure
+ DecodeReader_t DecodeReader = {0};
+ DecodeReaderInit(&DecodeReader, received, max_len, 0, NULL);
+
+ // wait for last transfer to complete
+ while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY));
+
+ LED_D_OFF();
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION);
+
+ // clear receive register and wait for next transfer
+ uint32_t temp = AT91C_BASE_SSC->SSC_RHR;
+ (void) temp;
+ while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)) ;
+
+ uint32_t dma_start_time = GetCountSspClk() & 0xfffffff8;
+
+ // Setup and start DMA.
+ FpgaSetupSscDma(dmaBuf, ISO15693_DMA_BUFFER_SIZE);
+ uint8_t *upTo = dmaBuf;
+
+ for (;;) {
+ uint16_t behindBy = ((uint8_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1);
+
+ if (behindBy == 0) continue;
+
+ b = *upTo++;
+ if (upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content.
+ upTo = dmaBuf; // start reading the circular buffer from the beginning
+ if (behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) {
+ Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy);
+ break;
}
- if((i+(int)arraylen(FrameEOF)/skip) >= BIGBUF_SIZE) {
- DbpString("ran off end!");
+ }
+ if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated.
+ AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and
+ AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers
+ }
+
+ for (int i = 7; i >= 0; i--) {
+ if (Handle15693SampleFromReader((b >> i) & 0x01, &DecodeReader)) {
+ *eof_time = dma_start_time + samples - DELAY_READER_TO_ARM; // end of EOF
+ gotFrame = true;
break;
}
+ samples++;
}
- if(mask != 0x01) {
- DbpString("sniff: error, uneven octet! (discard extra bits!)");
- /// DbpString(" mask=%02x", mask);
+
+ if (gotFrame) {
+ break;
}
- // uint8_t str1 [8];
- // itoa(k,str1);
- // strncat(str1," octets read",8);
-
- // DbpString( str1); // DbpString("%d octets", k);
-
- // for(i = 0; i < k; i+=3) {
- // //DbpString("# %2d: %02x ", i, outBuf[i]);
- // DbpIntegers(outBuf[i],outBuf[i+1],outBuf[i+2]);
- // }
-
- for(i = 0; i < k; i++) {
- receivedResponse[i] = outBuf[i];
+
+ if (BUTTON_PRESS()) {
+ DecodeReader.byteCount = -1;
+ break;
}
- } // "end if correlation > 0" (max/(arraylen(FrameSOF)/skip))
- return k; // return the number of bytes demodulated
-/// DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2));
+ WDT_HIT();
+ }
+
+ FpgaDisableSscDma();
+
+ if (DEBUG) Dbprintf("samples = %d, gotFrame = %d, Decoder: state = %d, len = %d, bitCount = %d, posCount = %d",
+ samples, gotFrame, DecodeReader.state, DecodeReader.byteCount, DecodeReader.bitCount, DecodeReader.posCount);
+
+ if (DecodeReader.byteCount > 0) {
+ uint32_t sof_time = *eof_time
+ - DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128:2048) // time for byte transfers
+ - 32 // time for SOF transfer
+ - 16; // time for EOF transfer
+ LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*32, *eof_time*32, NULL, true);
+ }
+
+ return DecodeReader.byteCount;
+}
+
+
+// Construct an identify (Inventory) request, which is the first
+// thing that you must send to a tag to get a response.
+static void BuildIdentifyRequest(uint8_t *cmd) {
+ uint16_t crc;
+ // one sub-carrier, inventory, 1 slot, fast rate
+ cmd[0] = ISO15693_REQ_INVENTORY | ISO15693_REQINV_SLOT1 | ISO15693_REQ_DATARATE_HIGH;
+ // inventory command code
+ cmd[1] = 0x01;
+ // no mask
+ cmd[2] = 0x00;
+ //Now the CRC
+ crc = Iso15693Crc(cmd, 3);
+ cmd[3] = crc & 0xff;
+ cmd[4] = crc >> 8;
}
-static void BuildIdentifyRequest(void);
//-----------------------------------------------------------------------------
// Start to read an ISO 15693 tag. We send an identify request, then wait
// for the response. The response is not demodulated, just left in the buffer
// so that it can be downloaded to a PC and processed there.
//-----------------------------------------------------------------------------
-void AcquireRawAdcSamplesIso15693(void)
-{
- LEDsoff();
+void AcquireRawAdcSamplesIso15693(void) {
LED_A_ON();
-
+
uint8_t *dest = BigBuf_get_addr();
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- BuildIdentifyRequest();
-
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER);
+ LED_D_ON();
+ FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER);
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+ uint8_t cmd[5];
+ BuildIdentifyRequest(cmd);
+ CodeIso15693AsReader(cmd, sizeof(cmd));
+
// Give the tags time to energize
- LED_D_ON();
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
SpinDelay(100);
// Now send the command
- FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX);
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
-
- LED_B_ON();
- for(int c = 0; c < ToSendMax; ) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = ~ToSend[c];
- c++;
- }
- WDT_HIT();
- }
- LED_B_OFF();
+ uint32_t start_time = 0;
+ TransmitTo15693Tag(ToSend, ToSendMax, &start_time);
// wait for last transfer to complete
- while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY));
+ while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)) ;
- FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_SUBCARRIER_424_KHZ | FPGA_HF_READER_MODE_RECEIVE_AMPLITUDE);
for(int c = 0; c < 4000; ) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- uint16_t iq = AT91C_BASE_SSC->SSC_RHR;
- // The samples are correlations against I and Q versions of the
- // tone that the tag AM-modulates. We just want power,
- // so abs(I) + abs(Q) is close to what we want.
- int8_t i = (int8_t)(iq >> 8);
- int8_t q = (int8_t)(iq & 0xff);
- uint8_t r = AMPLITUDE(i, q);
- dest[c++] = r;
+ uint16_t r = AT91C_BASE_SSC->SSC_RHR;
+ dest[c++] = r >> 5;
}
}
}
-// TODO: there is no trigger condition. The 14000 samples represent a time frame of 66ms.
-// It is unlikely that we get something meaningful.
-// TODO: Currently we only record tag answers. Add tracing of reader commands.
-// TODO: would we get something at all? The carrier is switched on...
-void RecordRawAdcSamplesIso15693(void)
-{
- LEDsoff();
+void SnoopIso15693(uint8_t jam_search_len, uint8_t *jam_search_string) {
+
LED_A_ON();
-
- uint8_t *dest = BigBuf_get_addr();
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- // Setup SSC
- FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
- // Start from off (no field generated)
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- SpinDelay(200);
+ clear_trace();
+ set_tracing(true);
+
+ // The DMA buffer, used to stream samples from the FPGA
+ uint16_t dmaBuf[ISO15693_DMA_BUFFER_SIZE];
+
+ // Count of samples received so far, so that we can include timing
+ // information in the trace buffer.
+ int samples = 0;
+
+ DecodeTag_t DecodeTag = {0};
+ uint8_t response[ISO15693_MAX_RESPONSE_LENGTH];
+ DecodeTagInit(&DecodeTag, response, sizeof(response));
+
+ DecodeReader_t DecodeReader = {0};
+ uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH];
+ DecodeReaderInit(&DecodeReader, cmd, sizeof(cmd), jam_search_len, jam_search_string);
+
+ // Print some debug information about the buffer sizes
+ if (DEBUG) {
+ Dbprintf("Snooping buffers initialized:");
+ Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen());
+ Dbprintf(" Reader -> tag: %i bytes", ISO15693_MAX_COMMAND_LENGTH);
+ Dbprintf(" tag -> Reader: %i bytes", ISO15693_MAX_RESPONSE_LENGTH);
+ Dbprintf(" DMA: %i bytes", ISO15693_DMA_BUFFER_SIZE * sizeof(uint16_t));
+ }
+ Dbprintf("Snoop started. Press PM3 Button to stop.");
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SNOOP_AMPLITUDE);
+ LED_D_OFF();
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+ FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER);
+ StartCountSspClk();
+ FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
- SpinDelay(100);
+ bool TagIsActive = false;
+ bool ReaderIsActive = false;
+ bool ExpectTagAnswer = false;
+ uint32_t dma_start_time = 0;
+ uint16_t *upTo = dmaBuf;
- LED_D_ON();
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+ uint16_t max_behindBy = 0;
+
+ // And now we loop, receiving samples.
+ for(;;) {
+ uint16_t behindBy = ((uint16_t*)AT91C_BASE_PDC_SSC->PDC_RPR - upTo) & (ISO15693_DMA_BUFFER_SIZE-1);
+ if (behindBy > max_behindBy) {
+ max_behindBy = behindBy;
+ }
+
+ if (behindBy == 0) continue;
- for(int c = 0; c < 14000;) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- uint16_t iq = AT91C_BASE_SSC->SSC_RHR;
- // The samples are correlations against I and Q versions of the
- // tone that the tag AM-modulates. We just want power,
- // so abs(I) + abs(Q) is close to what we want.
- int8_t i = (int8_t)(iq >> 8);
- int8_t q = (int8_t)(iq & 0xff);
- uint8_t r = AMPLITUDE(i, q);
- dest[c++] = r;
+ samples++;
+ if (samples == 1) {
+ // DMA has transferred the very first data
+ dma_start_time = GetCountSspClk() & 0xfffffff0;
+ }
+
+ uint16_t snoopdata = *upTo++;
+
+ if (upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content.
+ upTo = dmaBuf; // start reading the circular buffer from the beginning
+ if (behindBy > (9*ISO15693_DMA_BUFFER_SIZE/10)) {
+ // FpgaDisableTracing();
+ Dbprintf("About to blow circular buffer - aborted! behindBy=%d, samples=%d", behindBy, samples);
+ break;
+ }
+ if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated.
+ AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and
+ AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers
+ WDT_HIT();
+ if (BUTTON_PRESS()) {
+ DbpString("Snoop stopped.");
+ break;
+ }
+ }
}
+
+ if (!TagIsActive) { // no need to try decoding reader data if the tag is sending
+ if (Handle15693SampleFromReader(snoopdata & 0x02, &DecodeReader)) {
+ // FpgaDisableSscDma();
+ uint32_t eof_time = dma_start_time + samples*16 + 8 - DELAY_READER_TO_ARM_SNOOP; // end of EOF
+ if (DecodeReader.byteCount > 0) {
+ uint32_t sof_time = eof_time
+ - DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128*16:2048*16) // time for byte transfers
+ - 32*16 // time for SOF transfer
+ - 16*16; // time for EOF transfer
+ LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*4, eof_time*4, NULL, true);
+ }
+ /* And ready to receive another command. */
+ DecodeReaderReset(&DecodeReader);
+ /* And also reset the demod code, which might have been */
+ /* false-triggered by the commands from the reader. */
+ DecodeTagReset(&DecodeTag);
+ ReaderIsActive = false;
+ ExpectTagAnswer = true;
+ // upTo = dmaBuf;
+ // samples = 0;
+ // FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
+ // continue;
+ } else if (Handle15693SampleFromReader(snoopdata & 0x01, &DecodeReader)) {
+ // FpgaDisableSscDma();
+ uint32_t eof_time = dma_start_time + samples*16 + 16 - DELAY_READER_TO_ARM_SNOOP; // end of EOF
+ if (DecodeReader.byteCount > 0) {
+ uint32_t sof_time = eof_time
+ - DecodeReader.byteCount * (DecodeReader.Coding==CODING_1_OUT_OF_4?128*16:2048*16) // time for byte transfers
+ - 32*16 // time for SOF transfer
+ - 16*16; // time for EOF transfer
+ LogTrace_ISO15693(DecodeReader.output, DecodeReader.byteCount, sof_time*4, eof_time*4, NULL, true);
+ }
+ /* And ready to receive another command. */
+ DecodeReaderReset(&DecodeReader);
+ /* And also reset the demod code, which might have been */
+ /* false-triggered by the commands from the reader. */
+ DecodeTagReset(&DecodeTag);
+ ReaderIsActive = false;
+ ExpectTagAnswer = true;
+ // upTo = dmaBuf;
+ // samples = 0;
+ // FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
+ // continue;
+ } else {
+ ReaderIsActive = (DecodeReader.state >= STATE_READER_RECEIVE_DATA_1_OUT_OF_4);
+ }
+ }
+
+ if (!ReaderIsActive && ExpectTagAnswer) { // no need to try decoding tag data if the reader is currently sending or no answer expected yet
+ if (Handle15693SamplesFromTag(snoopdata >> 2, &DecodeTag)) {
+ // FpgaDisableSscDma();
+ uint32_t eof_time = dma_start_time + samples*16 - DELAY_TAG_TO_ARM_SNOOP; // end of EOF
+ if (DecodeTag.lastBit == SOF_PART2) {
+ eof_time -= 8*16; // needed 8 additional samples to confirm single SOF (iCLASS)
+ }
+ uint32_t sof_time = eof_time
+ - DecodeTag.len * 8 * 8 * 16 // time for byte transfers
+ - 32 * 16 // time for SOF transfer
+ - (DecodeTag.lastBit != SOF_PART2?32*16:0); // time for EOF transfer
+ LogTrace_ISO15693(DecodeTag.output, DecodeTag.len, sof_time*4, eof_time*4, NULL, false);
+ // And ready to receive another response.
+ DecodeTagReset(&DecodeTag);
+ DecodeReaderReset(&DecodeReader);
+ ExpectTagAnswer = false;
+ TagIsActive = false;
+ // upTo = dmaBuf;
+ // samples = 0;
+ // FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
+ // continue;
+ } else {
+ TagIsActive = (DecodeTag.state >= STATE_TAG_RECEIVING_DATA);
+ }
+ }
+
}
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- LED_D_OFF();
- Dbprintf("finished recording");
- LED_A_OFF();
+ FpgaDisableSscDma();
+
+ DbpString("Snoop statistics:");
+ Dbprintf(" ExpectTagAnswer: %d, TagIsActive: %d, ReaderIsActive: %d", ExpectTagAnswer, TagIsActive, ReaderIsActive);
+ Dbprintf(" DecodeTag State: %d", DecodeTag.state);
+ Dbprintf(" DecodeTag byteCnt: %d", DecodeTag.len);
+ Dbprintf(" DecodeTag posCount: %d", DecodeTag.posCount);
+ Dbprintf(" DecodeReader State: %d", DecodeReader.state);
+ Dbprintf(" DecodeReader byteCnt: %d", DecodeReader.byteCount);
+ Dbprintf(" DecodeReader posCount: %d", DecodeReader.posCount);
+ Dbprintf(" Trace length: %d", BigBuf_get_traceLen());
+ Dbprintf(" Max behindBy: %d", max_behindBy);
}
-// Initialize the proxmark as iso15k reader
-// (this might produces glitches that confuse some tags
-static void Iso15693InitReader() {
+// Initialize the proxmark as iso15k reader
+void Iso15693InitReader(void) {
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- // Setup SSC
- // FpgaSetupSsc();
- // Start from off (no field generated)
- LED_D_OFF();
+ // switch field off and wait until tag resets
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LED_D_OFF();
SpinDelay(10);
+ // switch field on
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER);
+ LED_D_ON();
+
+ // initialize SSC and select proper AD input
+ FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER);
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
- FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
- // Give the tags time to energize
- LED_D_ON();
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+ // give tags some time to energize
SpinDelay(250);
}
// This section basically contains transmission and receiving of bits
///////////////////////////////////////////////////////////////////////
-// Encode (into the ToSend buffers) an identify request, which is the first
-// thing that you must send to a tag to get a response.
-static void BuildIdentifyRequest(void)
-{
- uint8_t cmd[5];
-
- uint16_t crc;
- // one sub-carrier, inventory, 1 slot, fast rate
- // AFI is at bit 5 (1<<4) when doing an INVENTORY
- cmd[0] = (1 << 2) | (1 << 5) | (1 << 1);
- // inventory command code
- cmd[1] = 0x01;
- // no mask
- cmd[2] = 0x00;
- //Now the CRC
- crc = Crc(cmd, 3);
- cmd[3] = crc & 0xff;
- cmd[4] = crc >> 8;
-
- CodeIso15693AsReader(cmd, sizeof(cmd));
-}
// uid is in transmission order (which is reverse of display order)
-static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber )
-{
- uint8_t cmd[13];
-
+static void BuildReadBlockRequest(uint8_t *uid, uint8_t blockNumber, uint8_t *cmd) {
uint16_t crc;
- // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
- // followed by teh block data
- // one sub-carrier, inventory, 1 slot, fast rate
- cmd[0] = (1 << 6)| (1 << 5) | (1 << 1); // no SELECT bit, ADDR bit, OPTION bit
+ // If we set the Option_Flag in this request, the VICC will respond with the security status of the block
+ // followed by the block data
+ cmd[0] = ISO15693_REQ_OPTION | ISO15693_REQ_ADDRESS | ISO15693_REQ_DATARATE_HIGH;
// READ BLOCK command code
- cmd[1] = 0x20;
+ cmd[1] = ISO15693_READBLOCK;
// UID may be optionally specified here
// 64-bit UID
cmd[2] = uid[0];
cmd[8] = uid[6];
cmd[9] = uid[7]; // 0xe0; // always e0 (not exactly unique)
// Block number to read
- cmd[10] = blockNumber;//0x00;
+ cmd[10] = blockNumber;
//Now the CRC
- crc = Crc(cmd, 11); // the crc needs to be calculated over 12 bytes
+ crc = Iso15693Crc(cmd, 11); // the crc needs to be calculated over 11 bytes
cmd[11] = crc & 0xff;
cmd[12] = crc >> 8;
- CodeIso15693AsReader(cmd, sizeof(cmd));
}
// Now the VICC>VCD responses when we are simulating a tag
-static void BuildInventoryResponse( uint8_t *uid)
-{
+static void BuildInventoryResponse(uint8_t *uid) {
uint8_t cmd[12];
uint16_t crc;
- // one sub-carrier, inventory, 1 slot, fast rate
- // AFI is at bit 5 (1<<4) when doing an INVENTORY
- //(1 << 2) | (1 << 5) | (1 << 1);
- cmd[0] = 0; //
+
+ cmd[0] = 0; // No error, no protocol format extension
cmd[1] = 0; // DSFID (data storage format identifier). 0x00 = not supported
// 64-bit UID
cmd[2] = uid[7]; //0x32;
cmd[8] = uid[1]; //0x05;
cmd[9] = uid[0]; //0xe0;
//Now the CRC
- crc = Crc(cmd, 10);
+ crc = Iso15693Crc(cmd, 10);
cmd[10] = crc & 0xff;
cmd[11] = crc >> 8;
- CodeIso15693AsReader(cmd, sizeof(cmd));
+ CodeIso15693AsTag(cmd, sizeof(cmd));
}
// Universal Method for sending to and recv bytes from a tag
-// init ... should we initialize the reader?
-// speed ... 0 low speed, 1 hi speed
-// **recv will return you a pointer to the received data
-// If you do not need the answer use NULL for *recv[]
-// return: lenght of received data
-int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t **recv) {
-
- LED_A_ON();
- LED_B_OFF();
- LED_C_OFF();
-
- if (init) Iso15693InitReader();
+// init ... should we initialize the reader?
+// speed ... 0 low speed, 1 hi speed
+// *recv will contain the tag's answer
+// return: length of received data, or -1 for timeout
+int SendDataTag(uint8_t *send, int sendlen, bool init, bool speed_fast, uint8_t *recv, uint16_t max_recv_len, uint32_t start_time, uint16_t timeout, uint32_t *eof_time) {
+
+ if (init) {
+ Iso15693InitReader();
+ StartCountSspClk();
+ }
- int answerLen=0;
- uint8_t *answer = BigBuf_get_addr() + 4000;
- if (recv != NULL) memset(answer, 0, 100);
+ int answerLen = 0;
- if (!speed) {
- // low speed (1 out of 256)
- CodeIso15693AsReader256(send, sendlen);
- } else {
+ if (speed_fast) {
// high speed (1 out of 4)
CodeIso15693AsReader(send, sendlen);
+ } else {
+ // low speed (1 out of 256)
+ CodeIso15693AsReader256(send, sendlen);
}
-
- TransmitTo15693Tag(ToSend,ToSendMax);
+
+ TransmitTo15693Tag(ToSend, ToSendMax, &start_time);
+ uint32_t end_time = start_time + 32*(8*ToSendMax-4); // substract the 4 padding bits after EOF
+ LogTrace_ISO15693(send, sendlen, start_time*4, end_time*4, NULL, true);
+
// Now wait for a response
- if (recv!=NULL) {
- answerLen = GetIso15693AnswerFromTag(answer, 100);
- *recv=answer;
+ if (recv != NULL) {
+ answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, timeout, eof_time);
+ }
+
+ return answerLen;
+}
+
+
+int SendDataTagEOF(uint8_t *recv, uint16_t max_recv_len, uint32_t start_time, uint16_t timeout, uint32_t *eof_time) {
+
+ int answerLen = 0;
+
+ CodeIso15693AsReaderEOF();
+
+ TransmitTo15693Tag(ToSend, ToSendMax, &start_time);
+ uint32_t end_time = start_time + 32*(8*ToSendMax-4); // substract the 4 padding bits after EOF
+ LogTrace_ISO15693(NULL, 0, start_time*4, end_time*4, NULL, true);
+
+ // Now wait for a response
+ if (recv != NULL) {
+ answerLen = GetIso15693AnswerFromTag(recv, max_recv_len, timeout, eof_time);
}
- LED_A_OFF();
-
return answerLen;
}
// --------------------------------------------------------------------
-// Debug Functions
+// Debug Functions
// --------------------------------------------------------------------
// Decodes a message from a tag and displays its metadata and content
char status[DBD15STATLEN+1]={0};
uint16_t crc;
- if (len>3) {
- if (d[0]&(1<<3))
- strncat(status,"ProtExt ",DBD15STATLEN);
- if (d[0]&1) {
+ if (len > 3) {
+ if (d[0] & ISO15693_RES_EXT)
+ strncat(status,"ProtExt ", DBD15STATLEN);
+ if (d[0] & ISO15693_RES_ERROR) {
// error
- strncat(status,"Error ",DBD15STATLEN);
+ strncat(status,"Error ", DBD15STATLEN);
switch (d[1]) {
- case 0x01:
- strncat(status,"01:notSupp",DBD15STATLEN);
+ case 0x01:
+ strncat(status,"01:notSupp", DBD15STATLEN);
break;
- case 0x02:
- strncat(status,"02:notRecog",DBD15STATLEN);
+ case 0x02:
+ strncat(status,"02:notRecog", DBD15STATLEN);
break;
- case 0x03:
- strncat(status,"03:optNotSupp",DBD15STATLEN);
+ case 0x03:
+ strncat(status,"03:optNotSupp", DBD15STATLEN);
break;
- case 0x0f:
- strncat(status,"0f:noInfo",DBD15STATLEN);
+ case 0x0f:
+ strncat(status,"0f:noInfo", DBD15STATLEN);
break;
- case 0x10:
- strncat(status,"10:dontExist",DBD15STATLEN);
+ case 0x10:
+ strncat(status,"10:doesn'tExist", DBD15STATLEN);
break;
- case 0x11:
- strncat(status,"11:lockAgain",DBD15STATLEN);
+ case 0x11:
+ strncat(status,"11:lockAgain", DBD15STATLEN);
break;
- case 0x12:
- strncat(status,"12:locked",DBD15STATLEN);
+ case 0x12:
+ strncat(status,"12:locked", DBD15STATLEN);
break;
- case 0x13:
- strncat(status,"13:progErr",DBD15STATLEN);
+ case 0x13:
+ strncat(status,"13:progErr", DBD15STATLEN);
break;
- case 0x14:
- strncat(status,"14:lockErr",DBD15STATLEN);
+ case 0x14:
+ strncat(status,"14:lockErr", DBD15STATLEN);
break;
default:
- strncat(status,"unknownErr",DBD15STATLEN);
+ strncat(status,"unknownErr", DBD15STATLEN);
}
- strncat(status," ",DBD15STATLEN);
+ strncat(status," ", DBD15STATLEN);
} else {
- strncat(status,"NoErr ",DBD15STATLEN);
+ strncat(status,"NoErr ", DBD15STATLEN);
}
-
- crc=Crc(d,len-2);
- if ( (( crc & 0xff ) == d[len-2]) && (( crc >> 8 ) == d[len-1]) )
+
+ crc=Iso15693Crc(d,len-2);
+ if ( (( crc & 0xff ) == d[len-2]) && (( crc >> 8 ) == d[len-1]) )
strncat(status,"CrcOK",DBD15STATLEN);
else
- strncat(status,"CrcFail!",DBD15STATLEN);
+ strncat(status,"CrcFail!",DBD15STATLEN);
Dbprintf("%s",status);
}
return;
}
-//-----------------------------------------------------------------------------
-// Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector
-// all demodulation performed in arm rather than host. - greg
-//-----------------------------------------------------------------------------
-void ReaderIso15693(uint32_t parameter)
-{
- LEDsoff();
- LED_A_ON();
-
- int answerLen1 = 0;
- uint8_t TagUID[8] = {0x00};
-
- FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- uint8_t *answer1 = BigBuf_get_addr() + 4000;
- memset(answer1, 0x00, 200);
+//---------------------------------------------------------------------------------------
+// Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector.
+// all demodulation performed in arm rather than host. - greg
+//---------------------------------------------------------------------------------------
+void ReaderIso15693(uint32_t parameter) {
- SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
- // Setup SSC
- FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+ LED_A_ON();
- // Start from off (no field generated)
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- SpinDelay(200);
+ set_tracing(true);
- // Give the tags time to energize
- LED_D_ON();
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
- SpinDelay(200);
+ uint8_t TagUID[8] = {0x00};
+ uint8_t answer[ISO15693_MAX_RESPONSE_LENGTH];
// FIRST WE RUN AN INVENTORY TO GET THE TAG UID
// THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME
// Now send the IDENTIFY command
- BuildIdentifyRequest();
-
- TransmitTo15693Tag(ToSend,ToSendMax);
-
- // Now wait for a response
- answerLen1 = GetIso15693AnswerFromTag(answer1, 100) ;
-
- if (answerLen1 >=12) // we should do a better check than this
- {
- TagUID[0] = answer1[2];
- TagUID[1] = answer1[3];
- TagUID[2] = answer1[4];
- TagUID[3] = answer1[5];
- TagUID[4] = answer1[6];
- TagUID[5] = answer1[7];
- TagUID[6] = answer1[8]; // IC Manufacturer code
- TagUID[7] = answer1[9]; // always E0
-
+ uint8_t cmd[5];
+ BuildIdentifyRequest(cmd);
+ uint32_t start_time = 0;
+ uint32_t eof_time;
+ int answerLen = SendDataTag(cmd, sizeof(cmd), true, true, answer, sizeof(answer), start_time, ISO15693_READER_TIMEOUT, &eof_time);
+ start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER;
+
+ if (answerLen >= 12) { // we should do a better check than this
+ TagUID[0] = answer[2];
+ TagUID[1] = answer[3];
+ TagUID[2] = answer[4];
+ TagUID[3] = answer[5];
+ TagUID[4] = answer[6];
+ TagUID[5] = answer[7];
+ TagUID[6] = answer[8]; // IC Manufacturer code
+ TagUID[7] = answer[9]; // always E0
}
- Dbprintf("%d octets read from IDENTIFY request:", answerLen1);
- DbdecodeIso15693Answer(answerLen1,answer1);
- Dbhexdump(answerLen1,answer1,true);
+ Dbprintf("%d octets read from IDENTIFY request:", answerLen);
+ DbdecodeIso15693Answer(answerLen, answer);
+ Dbhexdump(answerLen, answer, false);
// UID is reverse
- if (answerLen1 >= 12)
+ if (answerLen >= 12)
Dbprintf("UID = %02hX%02hX%02hX%02hX%02hX%02hX%02hX%02hX",
TagUID[7],TagUID[6],TagUID[5],TagUID[4],
TagUID[3],TagUID[2],TagUID[1],TagUID[0]);
-
- // Dbprintf("%d octets read from SELECT request:", answerLen2);
- // DbdecodeIso15693Answer(answerLen2,answer2);
- // Dbhexdump(answerLen2,answer2,true);
-
- // Dbprintf("%d octets read from XXX request:", answerLen3);
- // DbdecodeIso15693Answer(answerLen3,answer3);
- // Dbhexdump(answerLen3,answer3,true);
-
// read all pages
- if (answerLen1 >= 12 && DEBUG) {
- uint8_t *answer2 = BigBuf_get_addr() + 4100;
- int i=0;
- while (i<32) { // sanity check, assume max 32 pages
- BuildReadBlockRequest(TagUID,i);
- TransmitTo15693Tag(ToSend,ToSendMax);
- int answerLen2 = GetIso15693AnswerFromTag(answer2, 100);
- if (answerLen2>0) {
- Dbprintf("READ SINGLE BLOCK %d returned %d octets:",i,answerLen2);
- DbdecodeIso15693Answer(answerLen2,answer2);
- Dbhexdump(answerLen2,answer2,true);
- if ( *((uint32_t*) answer2) == 0x07160101 ) break; // exit on NoPageErr
- }
- i++;
- }
+ if (answerLen >= 12 && DEBUG) {
+ for (int i = 0; i < 32; i++) { // sanity check, assume max 32 pages
+ uint8_t cmd[13];
+ BuildReadBlockRequest(TagUID, i, cmd);
+ answerLen = SendDataTag(cmd, sizeof(cmd), false, true, answer, sizeof(answer), start_time, ISO15693_READER_TIMEOUT, &eof_time);
+ start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER;
+ if (answerLen > 0) {
+ Dbprintf("READ SINGLE BLOCK %d returned %d octets:", i, answerLen);
+ DbdecodeIso15693Answer(answerLen, answer);
+ Dbhexdump(answerLen, answer, false);
+ if ( *((uint32_t*) answer) == 0x07160101 ) break; // exit on NoPageErr
+ }
+ }
}
- // for the time being, switch field off to protect rdv4.0
+ // for the time being, switch field off to protect RDV4
// note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LED_D_OFF();
-
+
LED_A_OFF();
}
-// Simulate an ISO15693 TAG, perform anti-collision and then print any reader commands
-// all demodulation performed in arm rather than host. - greg
-void SimTagIso15693(uint32_t parameter, uint8_t *uid)
-{
- LEDsoff();
- LED_A_ON();
-
- int answerLen1 = 0;
- int samples = 0;
- int elapsed = 0;
+// Initialize the proxmark as iso15k tag
+void Iso15693InitTag(void) {
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
-
- uint8_t *buf = BigBuf_get_addr() + 4000;
- memset(buf, 0x00, 100);
-
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
- FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION);
+ LED_D_OFF();
+ FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR);
+ StartCountSspClk();
+}
- // Start from off (no field generated)
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- SpinDelay(200);
- // Listen to reader
- answerLen1 = GetIso15693AnswerFromSniff(buf, 100, &samples, &elapsed) ;
+// Simulate an ISO15693 TAG.
+// For Inventory command: print command and send Inventory Response with given UID
+// TODO: interpret other reader commands and send appropriate response
+void SimTagIso15693(uint32_t parameter, uint8_t *uid) {
- if (answerLen1 >=1) // we should do a better check than this
- {
- // Build a suitable reponse to the reader INVENTORY cocmmand
- // not so obsvious, but in the call to BuildInventoryResponse, the command is copied to the global ToSend buffer used below.
-
- BuildInventoryResponse(uid);
-
- TransmitTo15693Reader(ToSend,ToSendMax);
- }
+ LED_A_ON();
- Dbprintf("%d octets read from reader command: %x %x %x %x %x %x %x %x %x", answerLen1,
- buf[0], buf[1], buf[2], buf[3],
- buf[4], buf[5], buf[6], buf[7], buf[8]);
+ Iso15693InitTag();
- Dbprintf("Simulationg uid: %x %x %x %x %x %x %x %x",
- uid[0], uid[1], uid[2], uid[3],
- uid[4], uid[5], uid[6], uid[7]);
+ // Build a suitable response to the reader INVENTORY command
+ BuildInventoryResponse(uid);
- LEDsoff();
+ // Listen to reader
+ while (!BUTTON_PRESS()) {
+ uint8_t cmd[ISO15693_MAX_COMMAND_LENGTH];
+ uint32_t eof_time = 0, start_time = 0;
+ int cmd_len = GetIso15693CommandFromReader(cmd, sizeof(cmd), &eof_time);
+
+ if ((cmd_len >= 5) && (cmd[0] & ISO15693_REQ_INVENTORY) && (cmd[1] == ISO15693_INVENTORY)) { // TODO: check more flags
+ bool slow = !(cmd[0] & ISO15693_REQ_DATARATE_HIGH);
+ start_time = eof_time + DELAY_ISO15693_VCD_TO_VICC_SIM;
+ TransmitTo15693Reader(ToSend, ToSendMax, &start_time, 0, slow);
+ }
+
+ Dbprintf("%d bytes read from reader:", cmd_len);
+ Dbhexdump(cmd_len, cmd, false);
+ }
+
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LED_D_OFF();
+ LED_A_OFF();
}
// Since there is no standardized way of reading the AFI out of a tag, we will brute force it
// (some manufactures offer a way to read the AFI, though)
-void BruteforceIso15693Afi(uint32_t speed)
-{
- LEDsoff();
+void BruteforceIso15693Afi(uint32_t speed) {
LED_A_ON();
-
- uint8_t data[20];
- uint8_t *recv=data;
- int datalen=0, recvlen=0;
-
- Iso15693InitReader();
-
+
+ uint8_t data[6];
+ uint8_t recv[ISO15693_MAX_RESPONSE_LENGTH];
+ int datalen = 0, recvlen = 0;
+ uint32_t eof_time;
+
// first without AFI
- // Tags should respond wihtout AFI and with AFI=0 even when AFI is active
-
- data[0]=ISO15_REQ_SUBCARRIER_SINGLE | ISO15_REQ_DATARATE_HIGH |
- ISO15_REQ_INVENTORY | ISO15_REQINV_SLOT1;
- data[1]=ISO15_CMD_INVENTORY;
- data[2]=0; // mask length
- datalen=AddCrc(data,3);
- recvlen=SendDataTag(data, datalen, false, speed, &recv);
+ // Tags should respond without AFI and with AFI=0 even when AFI is active
+
+ data[0] = ISO15693_REQ_DATARATE_HIGH | ISO15693_REQ_INVENTORY | ISO15693_REQINV_SLOT1;
+ data[1] = ISO15693_INVENTORY;
+ data[2] = 0; // mask length
+ datalen = Iso15693AddCrc(data,3);
+ uint32_t start_time = GetCountSspClk();
+ recvlen = SendDataTag(data, datalen, true, speed, recv, sizeof(recv), 0, ISO15693_READER_TIMEOUT, &eof_time);
+ start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER;
WDT_HIT();
if (recvlen>=12) {
- Dbprintf("NoAFI UID=%s",sprintUID(NULL,&recv[2]));
+ Dbprintf("NoAFI UID=%s", Iso15693sprintUID(NULL, &recv[2]));
}
-
+
// now with AFI
-
- data[0]=ISO15_REQ_SUBCARRIER_SINGLE | ISO15_REQ_DATARATE_HIGH |
- ISO15_REQ_INVENTORY | ISO15_REQINV_AFI | ISO15_REQINV_SLOT1;
- data[1]=ISO15_CMD_INVENTORY;
- data[2]=0; // AFI
- data[3]=0; // mask length
-
- for (int i=0;i<256;i++) {
- data[2]=i & 0xFF;
- datalen=AddCrc(data,4);
- recvlen=SendDataTag(data, datalen, false, speed, &recv);
+
+ data[0] = ISO15693_REQ_DATARATE_HIGH | ISO15693_REQ_INVENTORY | ISO15693_REQINV_AFI | ISO15693_REQINV_SLOT1;
+ data[1] = ISO15693_INVENTORY;
+ data[2] = 0; // AFI
+ data[3] = 0; // mask length
+
+ for (int i = 0; i < 256; i++) {
+ data[2] = i & 0xFF;
+ datalen = Iso15693AddCrc(data,4);
+ recvlen = SendDataTag(data, datalen, false, speed, recv, sizeof(recv), start_time, ISO15693_READER_TIMEOUT, &eof_time);
+ start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER;
WDT_HIT();
- if (recvlen>=12) {
- Dbprintf("AFI=%i UID=%s",i,sprintUID(NULL,&recv[2]));
+ if (recvlen >= 12) {
+ Dbprintf("AFI=%i UID=%s", i, Iso15693sprintUID(NULL, &recv[2]));
}
- }
+ }
Dbprintf("AFI Bruteforcing done.");
-
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- LEDsoff();
+
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LED_D_OFF();
+ LED_A_OFF();
+
}
// Allows to directly send commands to the tag via the client
void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint8_t data[]) {
- int recvlen=0;
- uint8_t *recvbuf = BigBuf_get_addr();
-
LED_A_ON();
+
+ int recvlen = 0;
+ uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH];
+ uint32_t eof_time;
+
+ uint16_t timeout;
+ bool request_answer = false;
+ switch (data[1]) {
+ case ISO15693_WRITEBLOCK:
+ case ISO15693_LOCKBLOCK:
+ case ISO15693_WRITE_MULTI_BLOCK:
+ case ISO15693_WRITE_AFI:
+ case ISO15693_LOCK_AFI:
+ case ISO15693_WRITE_DSFID:
+ case ISO15693_LOCK_DSFID:
+ timeout = ISO15693_READER_TIMEOUT_WRITE;
+ request_answer = data[0] & ISO15693_REQ_OPTION;
+ break;
+ default:
+ timeout = ISO15693_READER_TIMEOUT;
+ }
+
if (DEBUG) {
- Dbprintf("SEND");
- Dbhexdump(datalen,data,true);
+ Dbprintf("SEND:");
+ Dbhexdump(datalen, data, false);
+ }
+
+ recvlen = SendDataTag(data, datalen, true, speed, (recv?recvbuf:NULL), sizeof(recvbuf), 0, timeout, &eof_time);
+
+ if (request_answer) { // send a single EOF to get the tag response
+ recvlen = SendDataTagEOF((recv?recvbuf:NULL), sizeof(recvbuf), 0, ISO15693_READER_TIMEOUT, &eof_time);
}
- recvlen = SendDataTag(data, datalen, true, speed, (recv?&recvbuf:NULL));
+ // for the time being, switch field off to protect rdv4.0
+ // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LED_D_OFF();
- if (recv) {
- cmd_send(CMD_ACK, recvlen>48?48:recvlen, 0, 0, recvbuf, 48);
-
+ if (recv) {
if (DEBUG) {
- Dbprintf("RECV");
- DbdecodeIso15693Answer(recvlen,recvbuf);
- Dbhexdump(recvlen,recvbuf,true);
+ Dbprintf("RECV:");
+ if (recvlen > 0) {
+ Dbhexdump(recvlen, recvbuf, false);
+ DbdecodeIso15693Answer(recvlen, recvbuf);
+ }
}
+ if (recvlen > ISO15693_MAX_RESPONSE_LENGTH) {
+ recvlen = ISO15693_MAX_RESPONSE_LENGTH;
+ }
+ cmd_send(CMD_ACK, recvlen, 0, 0, recvbuf, ISO15693_MAX_RESPONSE_LENGTH);
}
- // for the time being, switch field off to protect rdv4.0
- // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- LED_D_OFF();
-
LED_A_OFF();
}
+//-----------------------------------------------------------------------------
+// Work with "magic Chinese" card.
+//
+//-----------------------------------------------------------------------------
+
+// Set the UID on Magic ISO15693 tag (based on Iceman's LUA-script).
+void SetTag15693Uid(uint8_t *uid) {
+
+ LED_A_ON();
+
+ uint8_t cmd[4][9] = {
+ {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x3e, 0x00, 0x00, 0x00, 0x00},
+ {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x3f, 0x69, 0x96, 0x00, 0x00},
+ {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x38},
+ {ISO15693_REQ_DATARATE_HIGH, ISO15693_WRITEBLOCK, 0x39}
+ };
+
+ uint16_t crc;
+
+ int recvlen = 0;
+ uint8_t recvbuf[ISO15693_MAX_RESPONSE_LENGTH];
+ uint32_t eof_time;
+
+ // Command 3 : 022138u8u7u6u5 (where uX = uid byte X)
+ cmd[2][3] = uid[7];
+ cmd[2][4] = uid[6];
+ cmd[2][5] = uid[5];
+ cmd[2][6] = uid[4];
+
+ // Command 4 : 022139u4u3u2u1 (where uX = uid byte X)
+ cmd[3][3] = uid[3];
+ cmd[3][4] = uid[2];
+ cmd[3][5] = uid[1];
+ cmd[3][6] = uid[0];
+
+ uint32_t start_time = 0;
+
+ for (int i = 0; i < 4; i++) {
+ // Add the CRC
+ crc = Iso15693Crc(cmd[i], 7);
+ cmd[i][7] = crc & 0xff;
+ cmd[i][8] = crc >> 8;
+
+ recvlen = SendDataTag(cmd[i], sizeof(cmd[i]), i==0?true:false, true, recvbuf, sizeof(recvbuf), start_time, ISO15693_READER_TIMEOUT_WRITE, &eof_time);
+ start_time = eof_time + DELAY_ISO15693_VICC_TO_VCD_READER;
+ if (DEBUG) {
+ Dbprintf("SEND:");
+ Dbhexdump(sizeof(cmd[i]), cmd[i], false);
+ Dbprintf("RECV:");
+ if (recvlen > 0) {
+ Dbhexdump(recvlen, recvbuf, false);
+ DbdecodeIso15693Answer(recvlen, recvbuf);
+ }
+ }
+ // Note: need to know if we expect an answer from one of the magic commands
+ // if (recvlen < 0) {
+ // break;
+ // }
+ }
+
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LED_D_OFF();
+
+ cmd_send(CMD_ACK, recvlen, 0, 0, recvbuf, recvlen);
+ LED_A_OFF();
+}
uint8_t cmd[12];
uint16_t crc;
- // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
- // followed by teh block data
+ // If we set the Option_Flag in this request, the VICC will respond with the security status of the block
+ // followed by the block data
// one sub-carrier, inventory, 1 slot, fast rate
cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit
// System Information command code
cmd[8] = 0x05;
cmd[9]= 0xe0; // always e0 (not exactly unique)
//Now the CRC
- crc = Crc(cmd, 10); // the crc needs to be calculated over 2 bytes
+ crc = Iso15693Crc(cmd, 10); // the crc needs to be calculated over 2 bytes
cmd[10] = crc & 0xff;
cmd[11] = crc >> 8;
uint8_t cmd[14];
uint16_t crc;
- // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
- // followed by teh block data
+ // If we set the Option_Flag in this request, the VICC will respond with the security status of the block
+ // followed by the block data
// one sub-carrier, inventory, 1 slot, fast rate
cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit
// READ Multi BLOCK command code
// Number of Blocks to read
cmd[11] = 0x2f; // read quite a few
//Now the CRC
- crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
+ crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
cmd[12] = crc & 0xff;
cmd[13] = crc >> 8;
uint8_t cmd[14];
uint16_t crc;
- // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
- // followed by teh block data
+ // If we set the Option_Flag in this request, the VICC will respond with the security status of the block
+ // followed by the block data
// one sub-carrier, inventory, 1 slot, fast rate
cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit
// READ BLOCK command code
cmd[10] = 0x00;
cmd[11] = 0x0a;
-// cmd[12] = 0x00;
-// cmd[13] = 0x00; //Now the CRC
- crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
+// cmd[12] = 0x00;
+// cmd[13] = 0x00; //Now the CRC
+ crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
cmd[12] = crc & 0xff;
cmd[13] = crc >> 8;
uint8_t cmd[14];
uint16_t crc;
- // If we set the Option_Flag in this request, the VICC will respond with the secuirty status of the block
- // followed by teh block data
+ // If we set the Option_Flag in this request, the VICC will respond with the security status of the block
+ // followed by the block data
// one sub-carrier, inventory, 1 slot, fast rate
cmd[0] = (1 << 5) | (1 << 1); // no SELECT bit
// READ BLOCK command code
cmd[8] = 0x05;
cmd[9]= 0xe0; // always e0 (not exactly unique)
// Parameter
- cmd[10] = 0x05; // for custom codes this must be manufcturer code
+ cmd[10] = 0x05; // for custom codes this must be manufacturer code
cmd[11] = 0x00;
-// cmd[12] = 0x00;
-// cmd[13] = 0x00; //Now the CRC
- crc = Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
+// cmd[12] = 0x00;
+// cmd[13] = 0x00; //Now the CRC
+ crc = Iso15693Crc(cmd, 12); // the crc needs to be calculated over 2 bytes
cmd[12] = crc & 0xff;
cmd[13] = crc >> 8;
projects / proxmark3-svn / blobdiff