#include "iso14443b.h"
#ifndef FWT_TIMEOUT_14B
-# define FWT_TIMEOUT_14B 60000
+// defaults to 2000ms
+# define FWT_TIMEOUT_14B 35312
#endif
#ifndef ISO14443B_DMA_BUFFER_SIZE
# define ISO14443B_DMA_BUFFER_SIZE 256
// 4sample
#define SEND4STUFFBIT(x) ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);
//#define SEND4STUFFBIT(x) ToSendStuffBit(x);
+ // iceman, this threshold value, what makes 8 a good amplituted for this IQ values?
+#ifndef SUBCARRIER_DETECT_THRESHOLD
+# define SUBCARRIER_DETECT_THRESHOLD 8
+#endif
+static void iso14b_set_timeout(uint32_t timeout);
+static void iso14b_set_maxframesize(uint16_t size);
static void switch_off(void);
// the block number for the ISO14443-4 PCB (used with APDUs)
static uint8_t pcb_blocknum = 0;
-
static uint32_t iso14b_timeout = FWT_TIMEOUT_14B;
-// param timeout is in ftw_
-void iso14b_set_timeout(uint32_t timeout) {
- // 9.4395us = 1etu.
- // clock is about 1.5 us
- iso14b_timeout = timeout;
- if(MF_DBGLEVEL >= 2) Dbprintf("ISO14443B Timeout set to %ld fwt", iso14b_timeout);
-}
-static void switch_off(void){
- if (MF_DBGLEVEL > 3) Dbprintf("switch_off");
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- SpinDelay(100);
- FpgaDisableSscDma();
- set_tracing(FALSE);
- LEDsoff();
-}
//=============================================================================
// An ISO 14443 Type B tag. We listen for commands from the reader, using
// memset(Demod.output, 0x00, MAX_FRAME_SIZE);
}
+
+/*
+* 9.4395 us = 1 ETU and clock is about 1.5 us
+* 13560000Hz
+* 1000ms/s
+* timeout in ETUs (time to transfer 1 bit, 9.4395 us)
+*
+* Formula to calculate FWT (in ETUs) by timeout (in ms):
+* fwt = 13560000 * 1000 / (8*16) * timeout;
+* Sample: 3sec == 3000ms
+* 13560000 * 1000 / (8*16) * 3000 ==
+* 13560000000 / 384000 = 35312 FWT
+* @param timeout is in frame wait time, fwt, measured in ETUs
+*/
+static void iso14b_set_timeout(uint32_t timeout) {
+ #define MAX_TIMEOUT 40542464 // 13560000Hz * 1000ms / (2^32-1) * (8*16)
+ if(timeout > MAX_TIMEOUT)
+ timeout = MAX_TIMEOUT;
+
+ iso14b_timeout = timeout;
+ if(MF_DBGLEVEL >= 3) Dbprintf("ISO14443B Timeout set to %ld fwt", iso14b_timeout);
+}
+static void iso14b_set_maxframesize(uint16_t size) {
+ if (size > 256)
+ size = MAX_FRAME_SIZE;
+
+ Uart.byteCntMax = size;
+ if(MF_DBGLEVEL >= 3) Dbprintf("ISO14443B Max frame size set to %d bytes", Uart.byteCntMax);
+}
+static void switch_off(void){
+ if (MF_DBGLEVEL > 3) Dbprintf("switch_off");
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ SpinDelay(100);
+ FpgaDisableSscDma();
+ set_tracing(FALSE);
+ LEDsoff();
+}
+
void AppendCrc14443b(uint8_t* data, int len) {
ComputeCrc14443(CRC_14443_B, data, len, data+len, data+len+1);
}
* Card data transmission
* - TR1
* - SOF
- * - data (each bytes is: 1startbit,8bits, 1stopbit)
+ * - data (each bytes is: 1startbit, 8bits, 1stopbit)
* - CRC_B
* - EOF
*
// Data bits
b = cmd[i];
for(j = 0; j < 8; ++j) {
- if(b & 1) {
- SEND4STUFFBIT(1);
- //ToSendStuffBit(1);
- } else {
- SEND4STUFFBIT(0);
- //ToSendStuffBit(0);
- }
+ // if(b & 1) {
+ // SEND4STUFFBIT(1);
+ // //ToSendStuffBit(1);
+ // } else {
+ // SEND4STUFFBIT(0);
+ // //ToSendStuffBit(0);
+ // }
+ SEND4STUFFBIT( b & 1 );
b >>= 1;
}
* false if we are still waiting for some more
*/
static RAMFUNC int Handle14443bReaderUartBit(uint8_t bit) {
- switch(Uart.state) {
+ switch (Uart.state) {
case STATE_UNSYNCD:
- if(!bit) {
+ if (!bit) {
// we went low, so this could be the beginning of an SOF
Uart.state = STATE_GOT_FALLING_EDGE_OF_SOF;
Uart.posCnt = 0;
case STATE_GOT_FALLING_EDGE_OF_SOF:
Uart.posCnt++;
- if(Uart.posCnt == 2) { // sample every 4 1/fs in the middle of a bit
- if(bit) {
- if(Uart.bitCnt > 9) {
+ if (Uart.posCnt == 2) { // sample every 4 1/fs in the middle of a bit
+ if (bit) {
+ if (Uart.bitCnt > 9) {
// we've seen enough consecutive
// zeros that it's a valid SOF
Uart.posCnt = 0;
Uart.state = STATE_AWAITING_START_BIT;
LED_A_ON(); // Indicate we got a valid SOF
} else {
- // didn't stay down long enough
- // before going high, error
+ // didn't stay down long enough before going high, error
Uart.state = STATE_UNSYNCD;
}
} else {
}
Uart.bitCnt++;
}
- if(Uart.posCnt >= 4) Uart.posCnt = 0;
- if(Uart.bitCnt > 12) {
- // Give up if we see too many zeros without
- // a one, too.
+ if (Uart.posCnt >= 4) Uart.posCnt = 0;
+ if (Uart.bitCnt > 12) {
+ // Give up if we see too many zeros without a one, too.
LED_A_OFF();
Uart.state = STATE_UNSYNCD;
}
case STATE_AWAITING_START_BIT:
Uart.posCnt++;
- if(bit) {
- if(Uart.posCnt > 50/2) { // max 57us between characters = 49 1/fs, max 3 etus after low phase of SOF = 24 1/fs
- // stayed high for too long between
- // characters, error
+ if (bit) {
+ if (Uart.posCnt > 50/2) { // max 57us between characters = 49 1/fs, max 3 etus after low phase of SOF = 24 1/fs
+ // stayed high for too long between characters, error
Uart.state = STATE_UNSYNCD;
}
} else {
case STATE_RECEIVING_DATA:
Uart.posCnt++;
- if(Uart.posCnt == 2) {
+ if (Uart.posCnt == 2) {
// time to sample a bit
Uart.shiftReg >>= 1;
- if(bit) {
+ if (bit) {
Uart.shiftReg |= 0x200;
}
Uart.bitCnt++;
}
- if(Uart.posCnt >= 4) {
+ if (Uart.posCnt >= 4) {
Uart.posCnt = 0;
}
- if(Uart.bitCnt == 10) {
- if((Uart.shiftReg & 0x200) && !(Uart.shiftReg & 0x001))
+ if (Uart.bitCnt == 10) {
+ if ((Uart.shiftReg & 0x200) && !(Uart.shiftReg & 0x001))
{
// this is a data byte, with correct
// start and stop bits
Uart.output[Uart.byteCnt] = (Uart.shiftReg >> 1) & 0xff;
Uart.byteCnt++;
- if(Uart.byteCnt >= Uart.byteCntMax) {
+ if (Uart.byteCnt >= Uart.byteCntMax) {
// Buffer overflowed, give up
LED_A_OFF();
Uart.state = STATE_UNSYNCD;
// this is an EOF byte
LED_A_OFF(); // Finished receiving
Uart.state = STATE_UNSYNCD;
- if (Uart.byteCnt != 0) {
- return TRUE;
- }
+ if (Uart.byteCnt != 0)
+ return TRUE;
+
} else {
// this is an error
LED_A_OFF();
Uart.state = STATE_UNSYNCD;
break;
}
-
return FALSE;
}
* false if we are still waiting for some more
*
*/
- // iceman, this threshold value, what makes 8 a good amplituted for this IQ values?
-#ifndef SUBCARRIER_DETECT_THRESHOLD
-# define SUBCARRIER_DETECT_THRESHOLD 6
-#endif
-
static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) {
- int v = 0, myI = 0, myQ = 0;
+ int v = 0, myI = ABS(ci), myQ = ABS(cq);
+
// The soft decision on the bit uses an estimate of just the
// quadrant of the reference angle, not the exact angle.
#define MAKE_SOFT_DECISION() { \
//note: couldn't we just use MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2) from common.h - marshmellow
#define CHECK_FOR_SUBCARRIER() { \
- myI = ABS(ci); \
- myQ = ABS(cq); \
v = MAX(myI, myQ) + (MIN(myI, myQ) >> 1); \
}
case DEMOD_UNSYNCD:
CHECK_FOR_SUBCARRIER();
-
+
// subcarrier detected
- if(v > SUBCARRIER_DETECT_THRESHOLD) {
+ if (v > SUBCARRIER_DETECT_THRESHOLD) {
Demod.state = DEMOD_PHASE_REF_TRAINING;
Demod.sumI = ci;
Demod.sumQ = cq;
break;
case DEMOD_PHASE_REF_TRAINING:
- if(Demod.posCount < 8) {
+ if (Demod.posCount < 8) {
CHECK_FOR_SUBCARRIER();
MAKE_SOFT_DECISION();
- if(v < 0) { // logic '0' detected
+ if (v < 0) { // logic '0' detected
Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF;
Demod.posCount = 0; // start of SOF sequence
} else {
MAKE_SOFT_DECISION();
- if(v > 0) {
+ if (v > 0) {
// low phase of SOF too short (< 9 etu). Note: spec is >= 10, but FPGA tends to "smear" edges
- if(Demod.posCount < 8*2) {
+ if (Demod.posCount < 8*2) {
Demod.state = DEMOD_UNSYNCD;
} else {
LED_C_ON(); // Got SOF
- Demod.startTime = GetCountSspClk();
+ //Demod.startTime = GetCountSspClk();
Demod.state = DEMOD_AWAITING_START_BIT;
Demod.posCount = 0;
Demod.len = 0;
Demod.thisBit += v;
Demod.shiftReg >>= 1;
- // logic '1'
+ // OR in a logic '1'
if (Demod.thisBit > 0) Demod.shiftReg |= 0x200;
++Demod.bitCount;
uint16_t s = Demod.shiftReg;
// stop bit == '1', start bit == '0'
- if((s & 0x200) && !(s & 0x001)) {
- uint8_t b = (s >> 1);
- Demod.output[Demod.len] = b;
+ if ((s & 0x200) && (s & 0x001) == 0 ) {
+ // left shift to drop the startbit
+ Demod.output[Demod.len] = (s >> 1) & 0xFF;
++Demod.len;
Demod.state = DEMOD_AWAITING_START_BIT;
} else {
+ // this one is a bit hard, either its a correc byte or its unsynced.
Demod.state = DEMOD_UNSYNCD;
- Demod.endTime = GetCountSspClk();
+ //Demod.endTime = GetCountSspClk();
LED_C_OFF();
// This is EOF (start, stop and all data bits == '0'
- if(s == 0) return TRUE;
+ if (s == 0) return TRUE;
}
}
Demod.posCount = 0;
static void GetTagSamplesFor14443bDemod() {
bool gotFrame = FALSE, finished = FALSE;
int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
- int ci = 0, cq = 0, samples = 0;
+ int ci = 0, cq = 0;
uint32_t time_0 = 0, time_stop = 0;
BigBuf_free();
ci = upTo[0] >> 1;
cq = upTo[1] >> 1;
upTo += 2;
- samples += 2;
-
lastRxCounter -= 2;
// restart DMA buffer to receive again.
}
// https://github.com/Proxmark/proxmark3/issues/103
- //gotFrame = Handle14443bTagSamplesDemod(ci & 0xfe, cq & 0xfe);
gotFrame = Handle14443bTagSamplesDemod(ci, cq);
time_stop = GetCountSspClk() - time_0;
}
FpgaDisableSscDma();
-
+
+ if ( upTo ) upTo = NULL;
+
if (MF_DBGLEVEL >= 3) {
- Dbprintf("time_stop = %u PDC_RCR = %u", time_stop, AT91C_BASE_PDC_SSC->PDC_RCR);
- Dbprintf("#Samples = %d, Demod.state = %d, Demod.len = %u",
- samples,
+ Dbprintf("Demod.state = %d, Demod.len = %u, PDC_RCR = %u",
Demod.state,
- Demod.len
+ Demod.len,
+ AT91C_BASE_PDC_SSC->PDC_RCR
);
}
+ // print the last batch of IQ values from FPGA
if (MF_DBGLEVEL == 4)
Dbhexdump(ISO14443B_DMA_BUFFER_SIZE, (uint8_t *)dmaBuf, FALSE);
if ( Demod.len > 0 )
- LogTrace(Demod.output, Demod.len, Demod.startTime, Demod.endTime, NULL, FALSE);
+ LogTrace(Demod.output, Demod.len, time_0, time_stop, NULL, FALSE);
}
// Code a layer 2 command (string of octets, including CRC) into ToSend[],
// so that it is ready to transmit to the tag using TransmitFor14443b().
//-----------------------------------------------------------------------------
-static void CodeIso14443bAsReader(const uint8_t *cmd, int len)
-{
+static void CodeIso14443bAsReader(const uint8_t *cmd, int len) {
/*
* Reader data transmission:
* - no modulation ONES
ToSendStuffBit(0);
// Data bits
b = cmd[i];
- if ( b & 1 ) ToSendStuffBit(1); else ToSendStuffBit(0);
- if ( (b>>1) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
- if ( (b>>2) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
- if ( (b>>3) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
- if ( (b>>4) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
- if ( (b>>5) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
- if ( (b>>6) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
- if ( (b>>7) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
+ // if ( b & 1 ) ToSendStuffBit(1); else ToSendStuffBit(0);
+ // if ( (b>>1) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
+ // if ( (b>>2) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
+ // if ( (b>>3) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
+ // if ( (b>>4) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
+ // if ( (b>>5) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
+ // if ( (b>>6) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
+ // if ( (b>>7) & 1) ToSendStuffBit(1); else ToSendStuffBit(0);
+
+ ToSendStuffBit( b & 1);
+ ToSendStuffBit( (b>>1) & 1);
+ ToSendStuffBit( (b>>2) & 1);
+ ToSendStuffBit( (b>>3) & 1);
+ ToSendStuffBit( (b>>4) & 1);
+ ToSendStuffBit( (b>>5) & 1);
+ ToSendStuffBit( (b>>6) & 1);
+ ToSendStuffBit( (b>>7) & 1);
+
// Stop bit
ToSendStuffBit(1);
// EGT extra guard time
}
-/**
- Convenience function to encode, transmit and trace iso 14443b comms
- **/
+/*
+* Convenience function to encode, transmit and trace iso 14443b comms
+*/
static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) {
+
+ uint32_t time_start = GetCountSspClk();
CodeIso14443bAsReader(cmd, len);
-
- uint32_t time_start = GetCountSspClk();
TransmitFor14443b_AsReader();
-
+
if(trigger) LED_A_ON();
-
+
LogTrace(cmd, len, time_start, GetCountSspClk()-time_start, NULL, TRUE);
}
ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]);
if ( crc[0] != Demod.output[1] || crc[1] != Demod.output[2] )
return 3;
-
- // CID
+
if (card) {
+
+ // CID
card->cid = Demod.output[0];
+
+ // MAX FRAME
+ uint16_t maxFrame = card->atqb[5] >> 4;
+ if (maxFrame < 5) maxFrame = 8 * maxFrame + 16;
+ else if (maxFrame == 5) maxFrame = 64;
+ else if (maxFrame == 6) maxFrame = 96;
+ else if (maxFrame == 7) maxFrame = 128;
+ else if (maxFrame == 8) maxFrame = 256;
+ else maxFrame = 257;
+ iso14b_set_maxframesize(maxFrame);
+
+ // FWT
uint8_t fwt = card->atqb[6] >> 4;
if ( fwt < 16 ){
uint32_t fwt_time = (302 << fwt);
void RAMFUNC SnoopIso14443b(void) {
uint32_t time_0 = 0, time_start = 0, time_stop = 0;
-
+ int ci = 0, cq = 0;
+ int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
+
// We won't start recording the frames that we acquire until we trigger;
// a good trigger condition to get started is probably when we see a
// response from the tag.
- int triggered = TRUE; // TODO: set and evaluate trigger condition
- int ci, cq;
- int maxBehindBy = 0;
- //int behindBy = 0;
- int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
-
+ bool triggered = TRUE; // TODO: set and evaluate trigger condition
bool TagIsActive = FALSE;
bool ReaderIsActive = FALSE;
for(;;) {
WDT_HIT();
-
- /* iceman: the & (and) should do what?
- ISO14443B_DMA_BUFFER_SIZE = 256
- Should it be a "mod 255" ?
-
- (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1);
-
- */
- int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & RECEIVE_MASK;
- if ( behindBy > maxBehindBy )
- maxBehindBy = behindBy;
-
- // this one needs the inner loop from tr
- if ( behindBy < 2 ) continue;
-
ci = upTo[0];
cq = upTo[1];
- upTo += 2;
-
+ upTo += 2;
lastRxCounter -= 2;
if (upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE;
- WDT_HIT();
-
- // TODO: understand whether we can increase/decrease as we want or not?
- if ( behindBy > ( 9 * ISO14443B_DMA_BUFFER_SIZE/10) ) {
- Dbprintf("blew circular buffer! behindBy = %d", behindBy);
- break;
- }
-
- if(!tracing) {
- DbpString("Trace full");
+
+ if (!tracing) {
+ if (MF_DBGLEVEL >= 2) DbpString("Trace full");
break;
}
- if(BUTTON_PRESS()) {
- DbpString("cancelled");
+ if (BUTTON_PRESS()) {
+ if (MF_DBGLEVEL >= 2) DbpString("cancelled");
break;
}
}
LED_A_OFF();
}
- if(!ReaderIsActive) {
+ if (!ReaderIsActive) {
// no need to try decoding tag data if the reader is sending - and we cannot afford the time
// is this | 0x01 the error? & 0xfe in https://github.com/Proxmark/proxmark3/issues/103
- if(Handle14443bTagSamplesDemod(ci & 0xFE, cq & 0xFE)) {
+ // LSB is a fpga signal bit.
+ if (Handle14443bTagSamplesDemod(ci >> 1, cq >> 1)) {
time_stop = GetCountSspClk() - time_0;
switch_off(); // Snoop
DbpString("Snoop statistics:");
- Dbprintf(" Max behind by: %i", maxBehindBy);
Dbprintf(" Uart State: %x ByteCount: %i ByteCountMax: %i", Uart.state, Uart.byteCnt, Uart.byteCntMax);
Dbprintf(" Trace length: %i", BigBuf_get_traceLen());
// free mem refs.
- if ( upTo ) upTo = NULL;
+ if ( upTo ) upTo = NULL;
// Uart.byteCntMax should be set with ATQB value..
}
projects / proxmark3-svn / blobdiff