// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
-// Routines to support ISO 14443. This includes both the reader software and
-// the `fake tag' modes. At the moment only the Type B modulation is
-// supported.
+// Routines to support ISO 14443B. This includes both the reader software and
+// the `fake tag' modes.
//-----------------------------------------------------------------------------
+#include "iso14443b.h"
+
+#ifndef FWT_TIMEOUT_14B
+// defaults to 2000ms
+# define FWT_TIMEOUT_14B 35312
+#endif
+#ifndef ISO14443B_DMA_BUFFER_SIZE
+# define ISO14443B_DMA_BUFFER_SIZE 256
+#endif
+#ifndef RECEIVE_MASK
+# define RECEIVE_MASK (ISO14443B_DMA_BUFFER_SIZE-1)
+#endif
+
+// Guard Time (per 14443-2)
+#ifndef TR0
+# define TR0 0
+#endif
+
+// Synchronization time (per 14443-2)
+#ifndef TR1
+# define TR1 0
+#endif
+// Frame Delay Time PICC to PCD (per 14443-3 Amendment 1)
+#ifndef TR2
+# define TR2 0
+#endif
+
+// 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;
-#include "proxmark3.h"
-#include "apps.h"
-#include "util.h"
-#include "string.h"
-
-#include "iso14443crc.h"
-
-//static void GetSamplesFor14443(int weTx, int n);
-
-/*#define DEMOD_TRACE_SIZE 4096
-#define READER_TAG_BUFFER_SIZE 2048
-#define TAG_READER_BUFFER_SIZE 2048
-#define DEMOD_DMA_BUFFER_SIZE 1024
-*/
-
-#define RECEIVE_SAMPLES_TIMEOUT 2000
//=============================================================================
// An ISO 14443 Type B tag. We listen for commands from the reader, using
// a response.
//=============================================================================
+
+//-----------------------------------------------------------------------------
+// The software UART that receives commands from the reader, and its state variables.
+//-----------------------------------------------------------------------------
+static struct {
+ enum {
+ STATE_UNSYNCD,
+ STATE_GOT_FALLING_EDGE_OF_SOF,
+ STATE_AWAITING_START_BIT,
+ STATE_RECEIVING_DATA
+ } state;
+ uint16_t shiftReg;
+ int bitCnt;
+ int byteCnt;
+ int byteCntMax;
+ int posCnt;
+ uint8_t *output;
+} Uart;
+
+static void UartReset() {
+ Uart.state = STATE_UNSYNCD;
+ Uart.shiftReg = 0;
+ Uart.bitCnt = 0;
+ Uart.byteCnt = 0;
+ Uart.byteCntMax = MAX_FRAME_SIZE;
+ Uart.posCnt = 0;
+}
+
+static void UartInit(uint8_t *data) {
+ Uart.output = data;
+ UartReset();
+// memset(Uart.output, 0x00, MAX_FRAME_SIZE);
+}
+
+//-----------------------------------------------------------------------------
+// The software Demod that receives commands from the tag, and its state variables.
+//-----------------------------------------------------------------------------
+static struct {
+ enum {
+ DEMOD_UNSYNCD,
+ DEMOD_PHASE_REF_TRAINING,
+ DEMOD_AWAITING_FALLING_EDGE_OF_SOF,
+ DEMOD_GOT_FALLING_EDGE_OF_SOF,
+ DEMOD_AWAITING_START_BIT,
+ DEMOD_RECEIVING_DATA
+ } state;
+ uint16_t bitCount;
+ int posCount;
+ int thisBit;
+/* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented.
+ int metric;
+ int metricN;
+*/
+ uint16_t shiftReg;
+ uint8_t *output;
+ uint16_t len;
+ int sumI;
+ int sumQ;
+ uint32_t startTime, endTime;
+} Demod;
+
+// Clear out the state of the "UART" that receives from the tag.
+static void DemodReset() {
+ Demod.state = DEMOD_UNSYNCD;
+ Demod.bitCount = 0;
+ Demod.posCount = 0;
+ Demod.thisBit = 0;
+ Demod.shiftReg = 0;
+ Demod.len = 0;
+ Demod.sumI = 0;
+ Demod.sumQ = 0;
+ Demod.startTime = 0;
+ Demod.endTime = 0;
+}
+
+static void DemodInit(uint8_t *data) {
+ Demod.output = data;
+ DemodReset();
+ // 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);
+}
+
//-----------------------------------------------------------------------------
// Code up a string of octets at layer 2 (including CRC, we don't generate
// that here) so that they can be transmitted to the reader. Doesn't transmit
// them yet, just leaves them ready to send in ToSend[].
//-----------------------------------------------------------------------------
-static void CodeIso14443bAsTag(const uint8_t *cmd, int len)
-{
- int i;
-
+static void CodeIso14443bAsTag(const uint8_t *cmd, int len) {
+ /* ISO 14443 B
+ *
+ * Reader to card | ASK - Amplitude Shift Keying Modulation (PCD to PICC for Type B) (NRZ-L encodig)
+ * Card to reader | BPSK - Binary Phase Shift Keying Modulation, (PICC to PCD for Type B)
+ *
+ * fc - carrier frequency 13.56mHz
+ * TR0 - Guard Time per 14443-2
+ * TR1 - Synchronization Time per 14443-2
+ * TR2 - PICC to PCD Frame Delay Time (per 14443-3 Amendment 1)
+ *
+ * Elementary Time Unit (ETU) is
+ * - 128 Carrier Cycles (9.4395 µS) = 8 Subcarrier Units
+ * - 1 ETU = 1 bit
+ * - 10 ETU = 1 startbit, 8 databits, 1 stopbit (10bits length)
+ * - startbit is a 0
+ * - stopbit is a 1
+ *
+ * Start of frame (SOF) is
+ * - [10-11] ETU of ZEROS, unmodulated time
+ * - [2-3] ETU of ONES,
+ *
+ * End of frame (EOF) is
+ * - [10-11] ETU of ZEROS, unmodulated time
+ *
+ * -TO VERIFY THIS BELOW-
+ * The mode FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK which we use to simulate tag
+ * works like this:
+ * - A 1-bit input to the FPGA becomes 8 pulses at 847.5kHz (1.18µS / pulse) == 9.44us
+ * - A 0-bit input to the FPGA becomes an unmodulated time of 1.18µS or does it become 8 nonpulses for 9.44us
+ *
+ * FPGA doesn't seem to work with ETU. It seems to work with pulse / duration instead.
+ *
+ * Card sends data ub 847.e kHz subcarrier
+ * subcar |duration| FC division
+ * -------+--------+------------
+ * 106kHz | 9.44µS | FC/128
+ * 212kHz | 4.72µS | FC/64
+ * 424kHz | 2.36µS | FC/32
+ * 848kHz | 1.18µS | FC/16
+ * -------+--------+------------
+ *
+ * Reader data transmission:
+ * - no modulation ONES
+ * - SOF
+ * - Command, data and CRC_B
+ * - EOF
+ * - no modulation ONES
+ *
+ * Card data transmission
+ * - TR1
+ * - SOF
+ * - data (each bytes is: 1startbit, 8bits, 1stopbit)
+ * - CRC_B
+ * - EOF
+ *
+ * FPGA implementation :
+ * At this point only Type A is implemented. This means that we are using a
+ * bit rate of 106 kbit/s, or fc/128. Oversample by 4, which ought to make
+ * things practical for the ARM (fc/32, 423.8 kbits/s, ~50 kbytes/s)
+ *
+ */
+
+ int i,j;
+ uint8_t b;
+
ToSendReset();
// Transmit a burst of ones, as the initial thing that lets the
- // reader get phase sync. This (TR1) must be > 80/fs, per spec,
- // but tag that I've tried (a Paypass) exceeds that by a fair bit,
- // so I will too.
- for(i = 0; i < 20; i++) {
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- }
+ // reader get phase sync.
+ // This loop is TR1, per specification
+ // TR1 minimum must be > 80/fs
+ // TR1 maximum 200/fs
+ // 80/fs < TR1 < 200/fs
+ // 10 ETU < TR1 < 24 ETU
// Send SOF.
- for(i = 0; i < 10; i++) {
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- }
- for(i = 0; i < 2; i++) {
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- }
-
- for(i = 0; i < len; i++) {
- int j;
- uint8_t b = cmd[i];
-
+ // 10-11 ETU * 4times samples ZEROS
+ for(i = 0; i < 10; i++) { SEND4STUFFBIT(0); }
+ //for(i = 0; i < 10; i++) { ToSendStuffBit(0); }
+
+ // 2-3 ETU * 4times samples ONES
+ for(i = 0; i < 3; i++) { SEND4STUFFBIT(1); }
+ //for(i = 0; i < 3; i++) { ToSendStuffBit(1); }
+
+ // data
+ for(i = 0; i < len; ++i) {
+
// Start bit
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
+ SEND4STUFFBIT(0);
+ //ToSendStuffBit(0);
// Data bits
- for(j = 0; j < 8; j++) {
- if(b & 1) {
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- } else {
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- }
+ b = cmd[i];
+ for(j = 0; j < 8; ++j) {
+ // if(b & 1) {
+ // SEND4STUFFBIT(1);
+ // //ToSendStuffBit(1);
+ // } else {
+ // SEND4STUFFBIT(0);
+ // //ToSendStuffBit(0);
+ // }
+ SEND4STUFFBIT( b & 1 );
b >>= 1;
}
// Stop bit
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- }
-
- // Send SOF.
- for(i = 0; i < 10; i++) {
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- }
- for(i = 0; i < 10; i++) {
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
+ SEND4STUFFBIT(1);
+ //ToSendStuffBit(1);
+
+ // Extra Guard bit
+ // For PICC it ranges 0-18us (1etu = 9us)
+ SEND4STUFFBIT(1);
+ //ToSendStuffBit(1);
}
+ // Send EOF.
+ // 10-11 ETU * 4 sample rate = ZEROS
+ for(i = 0; i < 10; i++) { SEND4STUFFBIT(0); }
+ //for(i = 0; i < 10; i++) { ToSendStuffBit(0); }
+
+ // why this?
+ for(i = 0; i < 40; i++) { SEND4STUFFBIT(1); }
+ //for(i = 0; i < 40; i++) { ToSendStuffBit(1); }
+
// Convert from last byte pos to length
- ToSendMax++;
-
- // Add a few more for slop
- ToSendMax += 2;
+ ++ToSendMax;
}
-//-----------------------------------------------------------------------------
-// The software UART that receives commands from the reader, and its state
-// variables.
-//-----------------------------------------------------------------------------
-static struct {
- enum {
- STATE_UNSYNCD,
- STATE_GOT_FALLING_EDGE_OF_SOF,
- STATE_AWAITING_START_BIT,
- STATE_RECEIVING_DATA,
- STATE_ERROR_WAIT
- } state;
- uint16_t shiftReg;
- int bitCnt;
- int byteCnt;
- int byteCntMax;
- int posCnt;
- uint8_t *output;
-} Uart;
/* Receive & handle a bit coming from the reader.
+ *
+ * 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 A -> ON once we have received the SOF and are expecting the rest.
* Returns: true if we received a EOF
* false if we are still waiting for some more
*/
-static int Handle14443UartBit(int bit)
-{
- switch(Uart.state) {
+static RAMFUNC int Handle14443bReaderUartBit(uint8_t bit) {
+ switch (Uart.state) {
case STATE_UNSYNCD:
- if(!bit) {
- // we went low, so this could be the beginning
- // of an SOF
+ 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;
Uart.bitCnt = 0;
case STATE_GOT_FALLING_EDGE_OF_SOF:
Uart.posCnt++;
- if(Uart.posCnt == 2) {
- if(bit) {
- if(Uart.bitCnt >= 10) {
+ 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
- Uart.state = STATE_ERROR_WAIT;
+ // didn't stay down long enough before going high, error
+ Uart.state = STATE_UNSYNCD;
}
} else {
// do nothing, keep waiting
}
Uart.bitCnt++;
}
- if(Uart.posCnt >= 4) Uart.posCnt = 0;
- if(Uart.bitCnt > 14) {
- // Give up if we see too many zeros without
- // a one, too.
- Uart.state = STATE_ERROR_WAIT;
+ 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;
}
break;
case STATE_AWAITING_START_BIT:
Uart.posCnt++;
- if(bit) {
- if(Uart.posCnt > 25) {
- // stayed high for too long between
- // characters, error
- Uart.state = STATE_ERROR_WAIT;
+ 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 {
// falling edge, this starts the data byte
Uart.bitCnt = 0;
Uart.shiftReg = 0;
Uart.state = STATE_RECEIVING_DATA;
- LED_A_ON(); // Indicate we're receiving
}
break;
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
- Uart.posCnt = 0;
- Uart.state = STATE_ERROR_WAIT;
+ LED_A_OFF();
+ Uart.state = STATE_UNSYNCD;
} else {
// so get the next byte now
Uart.posCnt = 0;
Uart.state = STATE_AWAITING_START_BIT;
}
- } else if(Uart.shiftReg == 0x000) {
+ } else if (Uart.shiftReg == 0x000) {
// this is an EOF byte
LED_A_OFF(); // Finished receiving
- return TRUE;
+ Uart.state = STATE_UNSYNCD;
+ if (Uart.byteCnt != 0)
+ return TRUE;
+
} else {
// this is an error
- Uart.posCnt = 0;
- Uart.state = STATE_ERROR_WAIT;
+ LED_A_OFF();
+ Uart.state = STATE_UNSYNCD;
}
}
break;
- case STATE_ERROR_WAIT:
- // We're all screwed up, so wait a little while
- // for whatever went wrong to finish, and then
- // start over.
- Uart.posCnt++;
- if(Uart.posCnt > 10) {
- Uart.state = STATE_UNSYNCD;
- }
- break;
-
default:
+ LED_A_OFF();
Uart.state = STATE_UNSYNCD;
break;
}
-
- if (Uart.state == STATE_UNSYNCD) LED_A_OFF();
-
return FALSE;
}
// Assume that we're called with the SSC (to the FPGA) and ADC path set
// correctly.
//-----------------------------------------------------------------------------
-static int GetIso14443CommandFromReader(uint8_t *received, int *len, int maxLen)
-{
- uint8_t mask;
- int i, bit;
-
- // Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
+static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) {
+ // Set FPGA mode to "simulated ISO 14443B tag", no modulation (listen
// only, since we are receiving, not transmitting).
// Signal field is off with the appropriate LED
LED_D_OFF();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION);
+
+ StartCountSspClk();
+
+ volatile uint8_t b = 0;
-
+ // clear receiving shift register and holding register
+ // What does this loop do? Is it TR1?
+ for(uint8_t c = 0; c < 10;) {
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ AT91C_BASE_SSC->SSC_THR = 0xFF;
+ ++c;
+ }
+ }
+
// Now run a `software UART' on the stream of incoming samples.
- Uart.output = received;
- Uart.byteCntMax = maxLen;
- Uart.state = STATE_UNSYNCD;
+ UartInit(received);
- for(;;) {
+ uint8_t mask;
+ while( !BUTTON_PRESS() ) {
WDT_HIT();
- if(BUTTON_PRESS()) return FALSE;
-
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = 0x00;
- }
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-
- mask = 0x80;
- for(i = 0; i < 8; i++, mask >>= 1) {
- bit = (b & mask);
- if(Handle14443UartBit(bit)) {
+ if ( AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY ) {
+ b = (uint8_t) AT91C_BASE_SSC->SSC_RHR;
+ for ( mask = 0x80; mask != 0; mask >>= 1) {
+ if ( Handle14443bReaderUartBit(b & mask)) {
*len = Uart.byteCnt;
return TRUE;
}
}
}
- }
+ }
+ return FALSE;
}
-//-----------------------------------------------------------------------------
-// Main loop of simulated tag: receive commands from reader, decide what
-// response to send, and send it.
-//-----------------------------------------------------------------------------
-void SimulateIso14443Tag(void)
-{
- static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 };
- static const uint8_t response1[] = {
- 0x50, 0x82, 0x0d, 0xe1, 0x74, 0x20, 0x38, 0x19, 0x22,
- 0x00, 0x21, 0x85, 0x5e, 0xd7
- };
+void ClearFpgaShiftingRegisters(void){
- uint8_t *resp;
- int respLen;
+ volatile uint8_t b;
- uint8_t *resp1 = BigBuf_get_addr() + 800;
- int resp1Len;
+ // clear receiving shift register and holding register
+ while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)) {};
- uint8_t *receivedCmd = BigBuf_get_addr();
- int len;
+ b = AT91C_BASE_SSC->SSC_RHR; (void) b;
- int i;
+ while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY)) {};
- int cmdsRecvd = 0;
+ b = AT91C_BASE_SSC->SSC_RHR; (void) b;
+
+ // wait for the FPGA to signal fdt_indicator == 1 (the FPGA is ready to queue new data in its delay line)
+ for (uint8_t j = 0; j < 5; j++) { // allow timeout - better late than never
+ while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
+ if (AT91C_BASE_SSC->SSC_RHR) break;
+ }
+
+ // Clear TXRDY:
+ //AT91C_BASE_SSC->SSC_THR = 0xFF;
+}
- FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- memset(receivedCmd, 0x44, 400);
+void WaitForFpgaDelayQueueIsEmpty( uint16_t delay ){
+ // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again:
+ uint8_t fpga_queued_bits = delay >> 3; // twich /8 ?? >>3,
+ for (uint8_t i = 0; i <= fpga_queued_bits/8 + 1; ) {
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ AT91C_BASE_SSC->SSC_THR = 0xFF;
+ i++;
+ }
+ }
+}
- CodeIso14443bAsTag(response1, sizeof(response1));
- memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
+static void TransmitFor14443b_AsTag( uint8_t *response, uint16_t len) {
- // We need to listen to the high-frequency, peak-detected path.
- SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+ volatile uint32_t b;
+
+ // Signal field is off with the appropriate LED
+ LED_D_OFF();
+ //uint16_t fpgasendQueueDelay = 0;
+
+ // Modulate BPSK
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK);
+ SpinDelay(40);
+
+ ClearFpgaShiftingRegisters();
+
FpgaSetupSsc();
- cmdsRecvd = 0;
-
- for(;;) {
- uint8_t b1, b2;
-
- if(!GetIso14443CommandFromReader(receivedCmd, &len, 100)) {
- Dbprintf("button pressed, received %d commands", cmdsRecvd);
- break;
- }
-
- // Good, look at the command now.
-
- if(len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len)==0) {
- resp = resp1; respLen = resp1Len;
- } else {
- Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd);
- // And print whether the CRC fails, just for good measure
- ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2);
- if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) {
- // Not so good, try again.
- DbpString("+++CRC fail");
- } else {
- DbpString("CRC passes");
- }
- break;
+ // Transmit the response.
+ for(uint16_t i = 0; i < len;) {
+ if(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
+ AT91C_BASE_SSC->SSC_THR = response[++i];
}
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+ b = AT91C_BASE_SSC->SSC_RHR;
+ (void)b;
+ }
+ }
+
+ //WaitForFpgaDelayQueueIsEmpty(fpgasendQueueDelay);
+ AT91C_BASE_SSC->SSC_THR = 0xFF;
+}
+//-----------------------------------------------------------------------------
+// Main loop of simulated tag: receive commands from reader, decide what
+// response to send, and send it.
+//-----------------------------------------------------------------------------
+void SimulateIso14443bTag(uint32_t pupi) {
- memset(receivedCmd, 0x44, 32);
+ ///////////// setup device.
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- cmdsRecvd++;
+ // allocate command receive buffer
+ BigBuf_free();
+ BigBuf_Clear_ext(false);
+ clear_trace(); //sim
+ set_tracing(TRUE);
+
+ // connect Demodulated Signal to ADC:
+ SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
- if(cmdsRecvd > 0x30) {
- DbpString("many commands later...");
- break;
- }
+ // Set up the synchronous serial port
+ FpgaSetupSsc();
+ /////////////
+
+ uint16_t len, cmdsReceived = 0;
+ int cardSTATE = SIM_NOFIELD;
+ int vHf = 0; // in mV
+ // uint32_t time_0 = 0;
+ // uint32_t t2r_time = 0;
+ // uint32_t r2t_time = 0;
+ uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
+
+ // the only commands we understand is WUPB, AFI=0, Select All, N=1:
+// static const uint8_t cmdWUPB[] = { ISO14443B_REQB, 0x00, 0x08, 0x39, 0x73 }; // WUPB
+ // ... and REQB, AFI=0, Normal Request, N=1:
+// static const uint8_t cmdREQB[] = { ISO14443B_REQB, 0x00, 0x00, 0x71, 0xFF }; // REQB
+ // ... and ATTRIB
+// static const uint8_t cmdATTRIB[] = { ISO14443B_ATTRIB, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; // ATTRIB
+
+ // ... if not PUPI/UID is supplied we always respond with ATQB, PUPI = 820de174, Application Data = 0x20381922,
+ // supports only 106kBit/s in both directions, max frame size = 32Bytes,
+ // supports ISO14443-4, FWI=8 (77ms), NAD supported, CID not supported:
+ uint8_t respATQB[] = { 0x50, 0x82, 0x0d, 0xe1, 0x74, 0x20, 0x38, 0x19,
+ 0x22, 0x00, 0x21, 0x85, 0x5e, 0xd7 };
+
+ // response to HLTB and ATTRIB
+ static const uint8_t respOK[] = {0x00, 0x78, 0xF0};
+
+ // ...PUPI/UID supplied from user. Adjust ATQB response accordingly
+ if ( pupi > 0 ) {
+ uint8_t len = sizeof(respATQB);
+ num_to_bytes(pupi, 4, respATQB+1);
+ ComputeCrc14443(CRC_14443_B, respATQB, 12, &respATQB[len-2], &respATQB[len-1]);
+ }
- if(respLen <= 0) continue;
+ // prepare "ATQB" tag answer (encoded):
+ CodeIso14443bAsTag(respATQB, sizeof(respATQB));
+ uint8_t *encodedATQB = BigBuf_malloc(ToSendMax);
+ uint16_t encodedATQBLen = ToSendMax;
+ memcpy(encodedATQB, ToSend, ToSendMax);
- // Modulate BPSK
- // Signal field is off with the appropriate LED
- LED_D_OFF();
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK);
- AT91C_BASE_SSC->SSC_THR = 0xff;
- FpgaSetupSsc();
+
+ // prepare "OK" tag answer (encoded):
+ CodeIso14443bAsTag(respOK, sizeof(respOK));
+ uint8_t *encodedOK = BigBuf_malloc(ToSendMax);
+ uint16_t encodedOKLen = ToSendMax;
+ memcpy(encodedOK, ToSend, ToSendMax);
+
+ // Simulation loop
+ while (!BUTTON_PRESS() && !usb_poll_validate_length()) {
+ WDT_HIT();
- // Transmit the response.
- i = 0;
- for(;;) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- uint8_t b = resp[i];
+ // find reader field
+ if (cardSTATE == SIM_NOFIELD) {
+ vHf = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10;
+ if ( vHf > MF_MINFIELDV ) {
+ cardSTATE = SIM_IDLE;
+ LED_A_ON();
+ }
+ }
+ if (cardSTATE == SIM_NOFIELD) continue;
- AT91C_BASE_SSC->SSC_THR = b;
+ // Get reader command
+ if (!GetIso14443bCommandFromReader(receivedCmd, &len)) {
+ Dbprintf("button pressed, received %d commands", cmdsReceived);
+ break;
+ }
- i++;
- if(i > respLen) {
- break;
- }
+ // ISO14443-B protocol states:
+ // REQ or WUP request in ANY state
+ // WUP in HALTED state
+ if (len == 5 ) {
+ if ( (receivedCmd[0] == ISO14443B_REQB && (receivedCmd[2] & 0x8)== 0x8 && cardSTATE == SIM_HALTED) ||
+ receivedCmd[0] == ISO14443B_REQB ){
+ LogTrace(receivedCmd, len, 0, 0, NULL, TRUE);
+ cardSTATE = SIM_SELECTING;
+ }
+ }
+
+ /*
+ * How should this flow go?
+ * REQB or WUPB
+ * send response ( waiting for Attrib)
+ * ATTRIB
+ * send response ( waiting for commands 7816)
+ * HALT
+ send halt response ( waiting for wupb )
+ */
+
+ switch (cardSTATE) {
+ //case SIM_NOFIELD:
+ case SIM_HALTED:
+ case SIM_IDLE: {
+ LogTrace(receivedCmd, len, 0, 0, NULL, TRUE);
+ break;
+ }
+ case SIM_SELECTING: {
+ TransmitFor14443b_AsTag( encodedATQB, encodedATQBLen );
+ LogTrace(respATQB, sizeof(respATQB), 0, 0, NULL, FALSE);
+ cardSTATE = SIM_WORK;
+ break;
+ }
+ case SIM_HALTING: {
+ TransmitFor14443b_AsTag( encodedOK, encodedOKLen );
+ LogTrace(respOK, sizeof(respOK), 0, 0, NULL, FALSE);
+ cardSTATE = SIM_HALTED;
+ break;
+ }
+ case SIM_ACKNOWLEDGE: {
+ TransmitFor14443b_AsTag( encodedOK, encodedOKLen );
+ LogTrace(respOK, sizeof(respOK), 0, 0, NULL, FALSE);
+ cardSTATE = SIM_IDLE;
+ break;
}
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
- (void)b;
+ case SIM_WORK: {
+ if ( len == 7 && receivedCmd[0] == ISO14443B_HALT ) {
+ cardSTATE = SIM_HALTED;
+ } else if ( len == 11 && receivedCmd[0] == ISO14443B_ATTRIB ) {
+ cardSTATE = SIM_ACKNOWLEDGE;
+ } else {
+ // Todo:
+ // - SLOT MARKER
+ // - ISO7816
+ // - emulate with a memory dump
+ Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsReceived);
+
+ // CRC Check
+ uint8_t b1, b2;
+ if (len >= 3){ // if crc exists
+ ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2);
+ if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1])
+ DbpString("+++CRC fail");
+ else
+ DbpString("CRC passes");
+ }
+ cardSTATE = SIM_IDLE;
+ }
+ break;
}
+ default: break;
+ }
+
+ ++cmdsReceived;
+ // iceman, could add a switch to turn this on/off (if off, no logging?)
+ if(cmdsReceived > 1000) {
+ DbpString("14B Simulate, 1000 commands later...");
+ break;
}
}
+ if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen());
+ switch_off(); //simulate
}
//=============================================================================
// PC side.
//=============================================================================
-static struct {
- enum {
- DEMOD_UNSYNCD,
- DEMOD_PHASE_REF_TRAINING,
- DEMOD_AWAITING_FALLING_EDGE_OF_SOF,
- DEMOD_GOT_FALLING_EDGE_OF_SOF,
- DEMOD_AWAITING_START_BIT,
- DEMOD_RECEIVING_DATA,
- DEMOD_ERROR_WAIT
- } state;
- int bitCount;
- int posCount;
- int thisBit;
- int metric;
- int metricN;
- uint16_t shiftReg;
- uint8_t *output;
- int len;
- int sumI;
- int sumQ;
-} Demod;
-
/*
* Handles reception of a bit from the tag
*
+ * This function is called 2 times per bit (every 4 subcarrier cycles).
+ * Subcarrier frequency fs is 848kHz, 1/fs = 1,18us, i.e. function is called every 4,72us
+ *
* LED handling:
* LED C -> ON once we have received the SOF and are expecting the rest.
* LED C -> OFF once we have received EOF or are unsynced
* false if we are still waiting for some more
*
*/
-static RAMFUNC int Handle14443SamplesDemod(int ci, int cq)
-{
- int v;
+static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) {
+ 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.
+// 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() { \
if(Demod.sumI > 0) { \
v = ci; \
} \
}
+// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by abs(ci) + abs(cq)
+// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq)))
+#define CHECK_FOR_SUBCARRIER_old() { \
+ if(ci < 0) { \
+ if(cq < 0) { /* ci < 0, cq < 0 */ \
+ if (cq < ci) { \
+ v = -cq - (ci >> 1); \
+ } else { \
+ v = -ci - (cq >> 1); \
+ } \
+ } else { /* ci < 0, cq >= 0 */ \
+ if (cq < -ci) { \
+ v = -ci + (cq >> 1); \
+ } else { \
+ v = cq - (ci >> 1); \
+ } \
+ } \
+ } else { \
+ if(cq < 0) { /* ci >= 0, cq < 0 */ \
+ if (-cq < ci) { \
+ v = ci - (cq >> 1); \
+ } else { \
+ v = -cq + (ci >> 1); \
+ } \
+ } else { /* ci >= 0, cq >= 0 */ \
+ if (cq < ci) { \
+ v = ci + (cq >> 1); \
+ } else { \
+ v = cq + (ci >> 1); \
+ } \
+ } \
+ } \
+ }
+
+//note: couldn't we just use MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2) from common.h - marshmellow
+#define CHECK_FOR_SUBCARRIER() { \
+ v = MAX(myI, myQ) + (MIN(myI, myQ) >> 1); \
+ }
+
switch(Demod.state) {
case DEMOD_UNSYNCD:
- v = ci;
- if(v < 0) v = -v;
- if(cq > 0) {
- v += cq;
- } else {
- v -= cq;
- }
- if(v > 40) {
- Demod.posCount = 0;
+
+ CHECK_FOR_SUBCARRIER();
+
+ // subcarrier detected
+ if (v > SUBCARRIER_DETECT_THRESHOLD) {
Demod.state = DEMOD_PHASE_REF_TRAINING;
- Demod.sumI = 0;
- Demod.sumQ = 0;
+ Demod.sumI = ci;
+ Demod.sumQ = cq;
+ Demod.posCount = 1;
}
break;
case DEMOD_PHASE_REF_TRAINING:
- if(Demod.posCount < 8) {
- Demod.sumI += ci;
- Demod.sumQ += cq;
- } else if(Demod.posCount > 100) {
- // error, waited too long
- Demod.state = DEMOD_UNSYNCD;
- } else {
- MAKE_SOFT_DECISION();
- if(v < 0) {
- Demod.state = DEMOD_AWAITING_FALLING_EDGE_OF_SOF;
- Demod.posCount = 0;
+ if (Demod.posCount < 8) {
+
+ CHECK_FOR_SUBCARRIER();
+
+ if (v > SUBCARRIER_DETECT_THRESHOLD) {
+ // set the reference phase (will code a logic '1') by averaging over 32 1/fs.
+ // note: synchronization time > 80 1/fs
+ Demod.sumI += ci;
+ Demod.sumQ += cq;
+ ++Demod.posCount;
+ } else {
+ // subcarrier lost
+ Demod.state = DEMOD_UNSYNCD;
}
+ } else {
+ Demod.state = DEMOD_AWAITING_FALLING_EDGE_OF_SOF;
}
- Demod.posCount++;
break;
case DEMOD_AWAITING_FALLING_EDGE_OF_SOF:
+
MAKE_SOFT_DECISION();
- if(v < 0) {
+
+ if (v < 0) { // logic '0' detected
Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF;
- Demod.posCount = 0;
+ Demod.posCount = 0; // start of SOF sequence
} else {
- if(Demod.posCount > 100) {
- Demod.state = DEMOD_UNSYNCD;
- }
+ // maximum length of TR1 = 200 1/fs
+ if(Demod.posCount > 26*2) Demod.state = DEMOD_UNSYNCD;
}
- Demod.posCount++;
+ ++Demod.posCount;
break;
case DEMOD_GOT_FALLING_EDGE_OF_SOF:
+ ++Demod.posCount;
+
MAKE_SOFT_DECISION();
- if(v > 0) {
- if(Demod.posCount < 12) {
+
+ 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) {
Demod.state = DEMOD_UNSYNCD;
} else {
LED_C_ON(); // Got SOF
+ //Demod.startTime = GetCountSspClk();
Demod.state = DEMOD_AWAITING_START_BIT;
Demod.posCount = 0;
Demod.len = 0;
- Demod.metricN = 0;
- Demod.metric = 0;
}
} else {
- if(Demod.posCount > 100) {
+ // low phase of SOF too long (> 12 etu)
+ if (Demod.posCount > 14*2) {
Demod.state = DEMOD_UNSYNCD;
+ LED_C_OFF();
}
}
- Demod.posCount++;
break;
case DEMOD_AWAITING_START_BIT:
+ ++Demod.posCount;
+
MAKE_SOFT_DECISION();
- if(v > 0) {
- if(Demod.posCount > 10) {
+
+ if (v > 0) {
+ if(Demod.posCount > 2*2) { // max 19us between characters = 16 1/fs, max 3 etu after low phase of SOF = 24 1/fs
Demod.state = DEMOD_UNSYNCD;
+ LED_C_OFF();
}
- } else {
+ } else { // start bit detected
Demod.bitCount = 0;
- Demod.posCount = 1;
+ Demod.posCount = 1; // this was the first half
Demod.thisBit = v;
Demod.shiftReg = 0;
Demod.state = DEMOD_RECEIVING_DATA;
break;
case DEMOD_RECEIVING_DATA:
+
MAKE_SOFT_DECISION();
- if(Demod.posCount == 0) {
+
+ if (Demod.posCount == 0) {
+ // first half of bit
Demod.thisBit = v;
Demod.posCount = 1;
} else {
+ // second half of bit
Demod.thisBit += v;
+ Demod.shiftReg >>= 1;
- if(Demod.thisBit > 0) {
- Demod.metric += Demod.thisBit;
- } else {
- Demod.metric -= Demod.thisBit;
- }
- (Demod.metricN)++;
-
- Demod.shiftReg >>= 1;
- if(Demod.thisBit > 0) {
- Demod.shiftReg |= 0x200;
- }
+ // OR in a logic '1'
+ if (Demod.thisBit > 0) Demod.shiftReg |= 0x200;
- Demod.bitCount++;
- if(Demod.bitCount == 10) {
+ ++Demod.bitCount;
+
+ // 1 start 8 data 1 stop = 10
+ if (Demod.bitCount == 10) {
+
uint16_t s = Demod.shiftReg;
- if((s & 0x200) && !(s & 0x001)) {
- uint8_t b = (s >> 1);
- Demod.output[Demod.len] = b;
- Demod.len++;
+
+ // stop bit == '1', start bit == '0'
+ 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 if(s == 0x000) {
- // This is EOF
- LED_C_OFF();
- Demod.state = DEMOD_UNSYNCD;
- return TRUE;
} else {
+ // this one is a bit hard, either its a correc byte or its unsynced.
Demod.state = DEMOD_UNSYNCD;
+ //Demod.endTime = GetCountSspClk();
+ LED_C_OFF();
+
+ // This is EOF (start, stop and all data bits == '0'
+ if (s == 0) return TRUE;
}
}
Demod.posCount = 0;
default:
Demod.state = DEMOD_UNSYNCD;
+ LED_C_OFF();
break;
}
-
- if (Demod.state == DEMOD_UNSYNCD) LED_C_OFF(); // Not synchronized...
return FALSE;
}
-static void DemodReset()
-{
- // Clear out the state of the "UART" that receives from the tag.
- Demod.len = 0;
- Demod.state = DEMOD_UNSYNCD;
- memset(Demod.output, 0x00, MAX_FRAME_SIZE);
-}
-
-
-static void DemodInit(uint8_t *data)
-{
- Demod.output = data;
- DemodReset();
-}
-
-
-static void UartReset()
-{
- Uart.byteCntMax = MAX_FRAME_SIZE;
- Uart.state = STATE_UNSYNCD;
- Uart.byteCnt = 0;
- Uart.bitCnt = 0;
-}
-
-
-static void UartInit(uint8_t *data)
-{
- Uart.output = data;
- UartReset();
-}
-
-
/*
* Demodulate the samples we received from the tag, also log to tracebuffer
- * weTx: set to 'TRUE' if we behave like a reader
- * set to 'FALSE' if we behave like a snooper
* quiet: set to 'TRUE' to disable debug output
*/
-static void GetSamplesFor14443Demod(int weTx, int n, int quiet)
-{
- int max = 0;
- int gotFrame = FALSE;
- int lastRxCounter, ci, cq, samples = 0;
+static void GetTagSamplesFor14443bDemod() {
+ bool gotFrame = FALSE, finished = FALSE;
+ int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
+ int ci = 0, cq = 0;
+ uint32_t time_0 = 0, time_stop = 0;
- // Allocate memory from BigBuf for some buffers
- // free all previous allocations first
BigBuf_free();
- // The response (tag -> reader) that we're receiving.
- uint8_t *receivedResponse = BigBuf_malloc(MAX_FRAME_SIZE);
+ // Set up the demodulator for tag -> reader responses.
+ DemodInit(BigBuf_malloc(MAX_FRAME_SIZE));
// The DMA buffer, used to stream samples from the FPGA
- int8_t *dmaBuf = (int8_t*) BigBuf_malloc(DMA_BUFFER_SIZE);
-
- // Set up the demodulator for tag -> reader responses.
- DemodInit(receivedResponse);
-
- // Setup and start DMA.
- FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE);
-
+ int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE);
int8_t *upTo = dmaBuf;
- lastRxCounter = DMA_BUFFER_SIZE;
+
+ // Setup and start DMA.
+ if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE) ){
+ if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting");
+ return;
+ }
- // Signal field is ON with the appropriate LED:
- if (weTx) LED_D_ON(); else LED_D_OFF();
// And put the FPGA in the appropriate mode
- FpgaWriteConfWord(
- FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ |
- (weTx ? 0 : FPGA_HF_READER_RX_XCORR_SNOOP));
-
- for(;;) {
- int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR;
- if(behindBy > max) max = behindBy;
-
- while(((lastRxCounter-AT91C_BASE_PDC_SSC->PDC_RCR) & (DMA_BUFFER_SIZE-1))
- > 2)
- {
- ci = upTo[0];
- cq = upTo[1];
- upTo += 2;
- if(upTo >= dmaBuf + DMA_BUFFER_SIZE) {
- upTo = dmaBuf;
- AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
- AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
- }
- lastRxCounter -= 2;
- if(lastRxCounter <= 0) {
- lastRxCounter += DMA_BUFFER_SIZE;
- }
-
- samples += 2;
-
- if(Handle14443SamplesDemod(ci, cq)) {
- gotFrame = 1;
- }
- }
-
- if(samples > n) {
- break;
- }
- }
- AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
- if (!quiet) Dbprintf("%x %x %x", max, gotFrame, Demod.len);
- //Tracing
- if (tracing && Demod.len > 0) {
- uint8_t parity[MAX_PARITY_SIZE];
- GetParity(Demod.output, Demod.len, parity);
- LogTrace(Demod.output, Demod.len, 0, 0, parity, FALSE);
- }
-}
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
+ // get current clock
+ time_0 = GetCountSspClk();
+
+ // rx counter - dma counter? (how much?) & (mod) mask > 2. (since 2bytes at the time is read)
+ while ( !finished ) {
-//-----------------------------------------------------------------------------
-// Read the tag's response. We just receive a stream of slightly-processed
-// samples from the FPGA, which we will later do some signal processing on,
-// to get the bits.
-//-----------------------------------------------------------------------------
-/*static void GetSamplesFor14443(int weTx, int n)
-{
- uint8_t *dest = (uint8_t *)BigBuf;
- int c;
+ LED_A_INV();
+ WDT_HIT();
- FpgaWriteConfWord(
- FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ |
- (weTx ? 0 : FPGA_HF_READER_RX_XCORR_SNOOP));
+ // LSB is a fpga signal bit.
+ ci = upTo[0] >> 1;
+ cq = upTo[1] >> 1;
+ upTo += 2;
+ lastRxCounter -= 2;
- c = 0;
- for(;;) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = 0x43;
+ // restart DMA buffer to receive again.
+ if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
+ upTo = dmaBuf;
+ lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
+ AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
+ AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE;
}
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- int8_t b;
- b = (int8_t)AT91C_BASE_SSC->SSC_RHR;
- dest[c++] = (uint8_t)b;
+ // https://github.com/Proxmark/proxmark3/issues/103
+ gotFrame = Handle14443bTagSamplesDemod(ci, cq);
+ time_stop = GetCountSspClk() - time_0;
- if(c >= n) {
- break;
- }
- }
+ finished = (time_stop > iso14b_timeout || gotFrame);
+ }
+
+ FpgaDisableSscDma();
+
+ if ( upTo ) upTo = NULL;
+
+ if (MF_DBGLEVEL >= 3) {
+ Dbprintf("Demod.state = %d, Demod.len = %u, PDC_RCR = %u",
+ Demod.state,
+ 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, time_0, time_stop, NULL, FALSE);
+}
//-----------------------------------------------------------------------------
// Transmit the command (to the tag) that was placed in ToSend[].
//-----------------------------------------------------------------------------
-static void TransmitFor14443(void)
-{
- int c;
+static void TransmitFor14443b_AsReader(void) {
- FpgaSetupSsc();
-
- while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = 0xff;
- }
-
- // Signal field is ON with the appropriate Red LED
- LED_D_ON();
- // Signal we are transmitting with the Green LED
- LED_B_ON();
- FpgaWriteConfWord(
- FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD);
-
- for(c = 0; c < 10;) {
+ // we could been in following mode:
+ // FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ
+ // if its second call or more
+
+ // while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ // AT91C_BASE_SSC->SSC_THR = 0XFF;
+ // }
+
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD);
+ SpinDelay(40);
+
+ int c;
+ volatile uint32_t b;
+
+ // What does this loop do? Is it TR1?
+ // 0xFF = 8 bits of 1. 1 bit == 1Etu,..
+ // loop 10 * 8 = 80 ETU of delay, with a non modulated signal. why?
+ // 80*9 = 720us.
+ for(c = 0; c < 50;) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = 0xff;
- c++;
+ AT91C_BASE_SSC->SSC_THR = 0xFF;
+ ++c;
}
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
- (void)r;
+ b = AT91C_BASE_SSC->SSC_RHR;
+ (void)b;
}
- WDT_HIT();
}
- c = 0;
- for(;;) {
+ // Send frame loop
+ for(c = 0; c < ToSendMax;) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = ToSend[c];
- c++;
- if(c >= ToSendMax) {
- break;
- }
+ AT91C_BASE_SSC->SSC_THR = ToSend[c++];
}
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
- (void)r;
- }
- WDT_HIT();
+ b = AT91C_BASE_SSC->SSC_RHR;
+ (void)b;
+ }
}
- LED_B_OFF(); // Finished sending
+ //WaitForFpgaDelayQueueIsEmpty(delay);
+ // We should wait here for the FPGA to send all bits.
+ WDT_HIT();
}
-
//-----------------------------------------------------------------------------
// Code a layer 2 command (string of octets, including CRC) into ToSend[],
-// so that it is ready to transmit to the tag using TransmitFor14443().
+// so that it is ready to transmit to the tag using TransmitFor14443b().
//-----------------------------------------------------------------------------
-static void CodeIso14443bAsReader(const uint8_t *cmd, int len)
-{
- int i, j;
+static void CodeIso14443bAsReader(const uint8_t *cmd, int len) {
+ /*
+ * Reader data transmission:
+ * - no modulation ONES
+ * - SOF
+ * - Command, data and CRC_B
+ * - EOF
+ * - no modulation ONES
+ *
+ * 1 ETU == 1 BIT!
+ * TR0 - 8 ETUS minimum.
+ *
+ * QUESTION: how long is a 1 or 0 in pulses in the xcorr_848 mode?
+ * 1 "stuffbit" = 1ETU (9us)
+ */
+ int i;
uint8_t b;
-
+
ToSendReset();
- // Establish initial reference level
- for(i = 0; i < 40; i++) {
- ToSendStuffBit(1);
- }
// Send SOF
- for(i = 0; i < 10; i++) {
+ // 10-11 ETUs of ZERO
+ for(i = 0; i < 10; ++i) ToSendStuffBit(0);
+
+ // 2-3 ETUs of ONE
+ ToSendStuffBit(1);
+ ToSendStuffBit(1);
+ ToSendStuffBit(1);
+
+ // Sending cmd, LSB
+ // from here we add BITS
+ for(i = 0; i < len; ++i) {
+ // Start bit
ToSendStuffBit(0);
- }
-
- for(i = 0; i < len; i++) {
- // Stop bits/EGT
+ // 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);
+
+ 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
+ // For PCD it ranges 0-57us (1etu = 9us)
ToSendStuffBit(1);
- // Start bit
- ToSendStuffBit(0);
- // Data bits
- b = cmd[i];
- for(j = 0; j < 8; j++) {
- if(b & 1) {
- ToSendStuffBit(1);
- } else {
- ToSendStuffBit(0);
- }
- b >>= 1;
- }
- }
- // Send EOF
- ToSendStuffBit(1);
- for(i = 0; i < 10; i++) {
- ToSendStuffBit(0);
- }
- for(i = 0; i < 8; i++) {
ToSendStuffBit(1);
- }
-
- // And then a little more, to make sure that the last character makes
- // it out before we switch to rx mode.
- for(i = 0; i < 24; i++) {
ToSendStuffBit(1);
}
-
+
+ // Send EOF
+ // 10-11 ETUs of ZERO
+ for(i = 0; i < 10; ++i) ToSendStuffBit(0);
+
+ // Transition time. TR0 - guard time
+ // 8ETUS minum?
+ // Per specification, Subcarrier must be stopped no later than 2 ETUs after EOF.
+ // I'm guessing this is for the FPGA to be able to send all bits before we switch to listening mode
+ for(i = 0; i < 32 ; ++i) ToSendStuffBit(1);
+
+ // TR1 - Synchronization time
// Convert from last character reference to length
- ToSendMax++;
+ ++ToSendMax;
}
-//-----------------------------------------------------------------------------
-// Read an ISO 14443 tag. We send it some set of commands, and record the
-// responses.
-// The command name is misleading, it actually decodes the reponse in HEX
-// into the output buffer (read the result using hexsamples, not hisamples)
-//
-// obsolete function only for test
-//-----------------------------------------------------------------------------
-void AcquireRawAdcSamplesIso14443(uint32_t parameter)
-{
- uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 };
+/*
+* 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);
+
+ TransmitFor14443b_AsReader();
- SendRawCommand14443B(sizeof(cmd1),1,1,cmd1);
+ if(trigger) LED_A_ON();
+
+ LogTrace(cmd, len, time_start, GetCountSspClk()-time_start, NULL, TRUE);
}
+/* Sends an APDU to the tag
+ * TODO: check CRC and preamble
+ */
+uint8_t iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *response)
+{
+ uint8_t crc[2] = {0x00, 0x00};
+ uint8_t message_frame[message_length + 4];
+ // PCB
+ message_frame[0] = 0x0A | pcb_blocknum;
+ pcb_blocknum ^= 1;
+ // CID
+ message_frame[1] = 0;
+ // INF
+ memcpy(message_frame + 2, message, message_length);
+ // EDC (CRC)
+ ComputeCrc14443(CRC_14443_B, message_frame, message_length + 2, &message_frame[message_length + 2], &message_frame[message_length + 3]);
+ // send
+ CodeAndTransmit14443bAsReader(message_frame, message_length + 4); //no
+ // get response
+ GetTagSamplesFor14443bDemod(); //no
+ if(Demod.len < 3)
+ return 0;
+
+ // VALIDATE CRC
+ ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]);
+ if ( crc[0] != Demod.output[Demod.len-2] || crc[1] != Demod.output[Demod.len-1] )
+ return 0;
+
+ // copy response contents
+ if(response != NULL)
+ memcpy(response, Demod.output, Demod.len);
+
+ return Demod.len;
+}
/**
- Convenience function to encode, transmit and trace iso 14443b comms
- **/
-static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len)
+* SRx Initialise.
+*/
+uint8_t iso14443b_select_srx_card(iso14b_card_select_t *card )
{
- CodeIso14443bAsReader(cmd, len);
- TransmitFor14443();
- if (tracing) {
- uint8_t parity[MAX_PARITY_SIZE];
- GetParity(cmd, len, parity);
- LogTrace(cmd,len, 0, 0, parity, TRUE);
+ // INITIATE command: wake up the tag using the INITIATE
+ static const uint8_t init_srx[] = { ISO14443B_INITIATE, 0x00, 0x97, 0x5b };
+ // SELECT command (with space for CRC)
+ uint8_t select_srx[] = { ISO14443B_SELECT, 0x00, 0x00, 0x00};
+ // temp to calc crc.
+ uint8_t crc[2] = {0x00, 0x00};
+
+ CodeAndTransmit14443bAsReader(init_srx, sizeof(init_srx));
+ GetTagSamplesFor14443bDemod(); //no
+
+ if (Demod.len == 0) return 2;
+
+ // Randomly generated Chip ID
+ if (card) card->chipid = Demod.output[0];
+
+ select_srx[1] = Demod.output[0];
+
+ ComputeCrc14443(CRC_14443_B, select_srx, 2, &select_srx[2], &select_srx[3]);
+ CodeAndTransmit14443bAsReader(select_srx, sizeof(select_srx));
+ GetTagSamplesFor14443bDemod(); //no
+
+ if (Demod.len != 3) return 2;
+
+ // Check the CRC of the answer:
+ 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;
+
+ // Check response from the tag: should be the same UID as the command we just sent:
+ if (select_srx[1] != Demod.output[0]) return 1;
+
+ // First get the tag's UID:
+ select_srx[0] = ISO14443B_GET_UID;
+
+ ComputeCrc14443(CRC_14443_B, select_srx, 1 , &select_srx[1], &select_srx[2]);
+ CodeAndTransmit14443bAsReader(select_srx, 3); // Only first three bytes for this one
+ GetTagSamplesFor14443bDemod(); //no
+
+ if (Demod.len != 10) return 2;
+
+ // The check the CRC of the answer
+ ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]);
+ if(crc[0] != Demod.output[8] || crc[1] != Demod.output[9]) return 3;
+
+ if (card) {
+ card->uidlen = 8;
+ memcpy(card->uid, Demod.output, 8);
}
+
+ return 0;
}
+/* Perform the ISO 14443 B Card Selection procedure
+ * Currently does NOT do any collision handling.
+ * It expects 0-1 cards in the device's range.
+ * TODO: Support multiple cards (perform anticollision)
+ * TODO: Verify CRC checksums
+ */
+uint8_t iso14443b_select_card(iso14b_card_select_t *card )
+{
+ // WUPB command (including CRC)
+ // Note: WUPB wakes up all tags, REQB doesn't wake up tags in HALT state
+ static const uint8_t wupb[] = { ISO14443B_REQB, 0x00, 0x08, 0x39, 0x73 };
+ // ATTRIB command (with space for CRC)
+ uint8_t attrib[] = { ISO14443B_ATTRIB, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00};
+
+ // temp to calc crc.
+ uint8_t crc[2] = {0x00, 0x00};
+
+ // first, wake up the tag
+ CodeAndTransmit14443bAsReader(wupb, sizeof(wupb));
+ GetTagSamplesFor14443bDemod(); //select_card
+
+ // ATQB too short?
+ if (Demod.len < 14) return 2;
+
+ // VALIDATE CRC
+ ComputeCrc14443(CRC_14443_B, Demod.output, Demod.len-2, &crc[0], &crc[1]);
+ if ( crc[0] != Demod.output[12] || crc[1] != Demod.output[13] )
+ return 3;
+
+ if (card) {
+ card->uidlen = 4;
+ memcpy(card->uid, Demod.output+1, 4);
+ memcpy(card->atqb, Demod.output+5, 7);
+ }
+
+ // copy the PUPI to ATTRIB ( PUPI == UID )
+ memcpy(attrib + 1, Demod.output + 1, 4);
+
+ // copy the protocol info from ATQB (Protocol Info -> Protocol_Type) into ATTRIB (Param 3)
+ attrib[7] = Demod.output[10] & 0x0F;
+ ComputeCrc14443(CRC_14443_B, attrib, 9, attrib + 9, attrib + 10);
+
+ CodeAndTransmit14443bAsReader(attrib, sizeof(attrib));
+ GetTagSamplesFor14443bDemod();//select_card
+ // Answer to ATTRIB too short?
+ if(Demod.len < 3) return 2;
+
+ // VALIDATE CRC
+ 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;
+
+ 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);
+ iso14b_set_timeout( fwt_time);
+ }
+ }
+ // reset PCB block number
+ pcb_blocknum = 0;
+ return 0;
+}
+
+// Set up ISO 14443 Type B communication (similar to iso14443a_setup)
+// field is setup for "Sending as Reader"
+void iso14443b_setup() {
+ if (MF_DBGLEVEL > 3) Dbprintf("iso1443b_setup Enter");
+ LEDsoff();
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ //BigBuf_free();
+ //BigBuf_Clear_ext(false);
+
+ // Initialize Demod and Uart structs
+ DemodInit(BigBuf_malloc(MAX_FRAME_SIZE));
+ UartInit(BigBuf_malloc(MAX_FRAME_SIZE));
+
+ // connect Demodulated Signal to ADC:
+ SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+ // Set up the synchronous serial port
+ FpgaSetupSsc();
+
+ // Signal field is on with the appropriate LED
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD);
+ SpinDelay(100);
+
+ // Start the timer
+ StartCountSspClk();
+
+ LED_D_ON();
+ if (MF_DBGLEVEL > 3) Dbprintf("iso1443b_setup Exit");
+}
//-----------------------------------------------------------------------------
-// Read a SRI512 ISO 14443 tag.
+// Read a SRI512 ISO 14443B tag.
//
// SRI512 tags are just simple memory tags, here we're looking at making a dump
// of the contents of the memory. No anticollision algorithm is done, we assume
//
// I tried to be systematic and check every answer of the tag, every CRC, etc...
//-----------------------------------------------------------------------------
-void ReadSTMemoryIso14443(uint32_t dwLast)
+void ReadSTMemoryIso14443b(uint8_t numofblocks)
{
- clear_trace();
- set_tracing(TRUE);
-
- uint8_t i = 0x00;
-
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+
// Make sure that we start from off, since the tags are stateful;
// confusing things will happen if we don't reset them between reads.
- LED_D_OFF();
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- SpinDelay(200);
+ switch_off(); // before ReadStMemory
+
+ set_tracing(TRUE);
+
+ uint8_t i = 0x00;
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
FpgaSetupSsc();
// Now give it time to spin up.
// Signal field is on with the appropriate LED
LED_D_ON();
- FpgaWriteConfWord(
- FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
- SpinDelay(200);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
+ SpinDelay(20);
// First command: wake up the tag using the INITIATE command
- uint8_t cmd1[] = { 0x06, 0x00, 0x97, 0x5b};
-
- CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
-// LED_A_ON();
- GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE);
-// LED_A_OFF();
+ uint8_t cmd1[] = {ISO14443B_INITIATE, 0x00, 0x97, 0x5b};
+ CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); //no
+ GetTagSamplesFor14443bDemod(); // no
if (Demod.len == 0) {
- DbpString("No response from tag");
- return;
+ DbpString("No response from tag");
+ set_tracing(FALSE);
+ return;
} else {
- Dbprintf("Randomly generated UID from tag (+ 2 byte CRC): %x %x %x",
- Demod.output[0], Demod.output[1],Demod.output[2]);
+ Dbprintf("Randomly generated Chip ID (+ 2 byte CRC): %02x %02x %02x",
+ Demod.output[0], Demod.output[1], Demod.output[2]);
}
+
// There is a response, SELECT the uid
DbpString("Now SELECT tag:");
- cmd1[0] = 0x0E; // 0x0E is SELECT
+ cmd1[0] = ISO14443B_SELECT; // 0x0E is SELECT
cmd1[1] = Demod.output[0];
ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]);
- CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
-
-// LED_A_ON();
- GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE);
-// LED_A_OFF();
+ CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); //no
+ GetTagSamplesFor14443bDemod(); //no
if (Demod.len != 3) {
- Dbprintf("Expected 3 bytes from tag, got %d", Demod.len);
- return;
+ Dbprintf("Expected 3 bytes from tag, got %d", Demod.len);
+ set_tracing(FALSE);
+ return;
}
// Check the CRC of the answer:
ComputeCrc14443(CRC_14443_B, Demod.output, 1 , &cmd1[2], &cmd1[3]);
if(cmd1[2] != Demod.output[1] || cmd1[3] != Demod.output[2]) {
- DbpString("CRC Error reading select response.");
- return;
+ DbpString("CRC Error reading select response.");
+ set_tracing(FALSE);
+ return;
}
// Check response from the tag: should be the same UID as the command we just sent:
if (cmd1[1] != Demod.output[0]) {
- Dbprintf("Bad response to SELECT from Tag, aborting: %x %x", cmd1[1], Demod.output[0]);
- return;
+ Dbprintf("Bad response to SELECT from Tag, aborting: %02x %02x", cmd1[1], Demod.output[0]);
+ set_tracing(FALSE);
+ return;
}
+
// Tag is now selected,
// First get the tag's UID:
- cmd1[0] = 0x0B;
+ cmd1[0] = ISO14443B_GET_UID;
ComputeCrc14443(CRC_14443_B, cmd1, 1 , &cmd1[1], &cmd1[2]);
- CodeAndTransmit14443bAsReader(cmd1, 3); // Only first three bytes for this one
-
-// LED_A_ON();
- GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE);
-// LED_A_OFF();
+ CodeAndTransmit14443bAsReader(cmd1, 3); // no -- Only first three bytes for this one
+ GetTagSamplesFor14443bDemod(); //no
if (Demod.len != 10) {
- Dbprintf("Expected 10 bytes from tag, got %d", Demod.len);
- return;
+ Dbprintf("Expected 10 bytes from tag, got %d", Demod.len);
+ set_tracing(FALSE);
+ return;
}
// The check the CRC of the answer (use cmd1 as temporary variable):
ComputeCrc14443(CRC_14443_B, Demod.output, 8, &cmd1[2], &cmd1[3]);
- if(cmd1[2] != Demod.output[8] || cmd1[3] != Demod.output[9]) {
- Dbprintf("CRC Error reading block! - Below: expected, got %x %x",
- (cmd1[2]<<8)+cmd1[3], (Demod.output[8]<<8)+Demod.output[9]);
+ if(cmd1[2] != Demod.output[8] || cmd1[3] != Demod.output[9]) {
+ Dbprintf("CRC Error reading block! Expected: %04x got: %04x",
+ (cmd1[2]<<8)+cmd1[3], (Demod.output[8]<<8)+Demod.output[9]);
// Do not return;, let's go on... (we should retry, maybe ?)
}
Dbprintf("Tag UID (64 bits): %08x %08x",
- (Demod.output[7]<<24) + (Demod.output[6]<<16) + (Demod.output[5]<<8) + Demod.output[4],
- (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0]);
+ (Demod.output[7]<<24) + (Demod.output[6]<<16) + (Demod.output[5]<<8) + Demod.output[4],
+ (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0]);
// Now loop to read all 16 blocks, address from 0 to last block
- Dbprintf("Tag memory dump, block 0 to %d",dwLast);
+ Dbprintf("Tag memory dump, block 0 to %d", numofblocks);
cmd1[0] = 0x08;
i = 0x00;
- dwLast++;
+ ++numofblocks;
+
for (;;) {
- if (i == dwLast) {
+ if (i == numofblocks) {
DbpString("System area block (0xff):");
i = 0xff;
}
cmd1[1] = i;
ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]);
- CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
-
-// LED_A_ON();
- GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE);
-// LED_A_OFF();
+ CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); //no
+ GetTagSamplesFor14443bDemod(); //no
+
if (Demod.len != 6) { // Check if we got an answer from the tag
- DbpString("Expected 6 bytes from tag, got less...");
- return;
+ DbpString("Expected 6 bytes from tag, got less...");
+ return;
}
// The check the CRC of the answer (use cmd1 as temporary variable):
ComputeCrc14443(CRC_14443_B, Demod.output, 4, &cmd1[2], &cmd1[3]);
if(cmd1[2] != Demod.output[4] || cmd1[3] != Demod.output[5]) {
- Dbprintf("CRC Error reading block! - Below: expected, got %x %x",
- (cmd1[2]<<8)+cmd1[3], (Demod.output[4]<<8)+Demod.output[5]);
+ Dbprintf("CRC Error reading block! Expected: %04x got: %04x",
+ (cmd1[2]<<8)+cmd1[3], (Demod.output[4]<<8)+Demod.output[5]);
// Do not return;, let's go on... (we should retry, maybe ?)
}
// Now print out the memory location:
- Dbprintf("Address=%x, Contents=%x, CRC=%x", i,
- (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0],
- (Demod.output[4]<<8)+Demod.output[5]);
- if (i == 0xff) {
- break;
- }
- i++;
+ Dbprintf("Address=%02x, Contents=%08x, CRC=%04x", i,
+ (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0],
+ (Demod.output[4]<<8)+Demod.output[5]);
+
+ if (i == 0xff) break;
+ ++i;
}
+
+ set_tracing(FALSE);
}
+static void iso1444b_setup_snoop(void){
+ if (MF_DBGLEVEL > 3) Dbprintf("iso1443b_setup_snoop Enter");
+ LEDsoff();
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ BigBuf_free();
+ BigBuf_Clear_ext(false);
+ clear_trace();//setup snoop
+ set_tracing(TRUE);
+
+ // Initialize Demod and Uart structs
+ DemodInit(BigBuf_malloc(MAX_FRAME_SIZE));
+ UartInit(BigBuf_malloc(MAX_FRAME_SIZE));
+
+ if (MF_DBGLEVEL > 1) {
+ // Print debug information about the buffer sizes
+ Dbprintf("Snooping buffers initialized:");
+ Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen());
+ Dbprintf(" Reader -> tag: %i bytes", MAX_FRAME_SIZE);
+ Dbprintf(" tag -> Reader: %i bytes", MAX_FRAME_SIZE);
+ Dbprintf(" DMA: %i bytes", ISO14443B_DMA_BUFFER_SIZE);
+ }
+
+ // connect Demodulated Signal to ADC:
+ SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+ // Setup for the DMA.
+ FpgaSetupSsc();
+
+ // Set FPGA in the appropriate mode
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ | FPGA_HF_READER_RX_XCORR_SNOOP);
+ SpinDelay(20);
+
+ // Start the SSP timer
+ StartCountSspClk();
+ if (MF_DBGLEVEL > 3) Dbprintf("iso1443b_setup_snoop Exit");
+}
+
//=============================================================================
// Finally, the `sniffer' combines elements from both the reader and
// simulated tag, to show both sides of the conversation.
* Memory usage for this function, (within BigBuf)
* Last Received command (reader->tag) - MAX_FRAME_SIZE
* Last Received command (tag->reader) - MAX_FRAME_SIZE
- * DMA Buffer, 1024 bytes (samples) - DMA_BUFFER_SIZE
+ * DMA Buffer - ISO14443B_DMA_BUFFER_SIZE
* Demodulated samples received - all the rest
*/
-void RAMFUNC SnoopIso14443(void)
-{
+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
-
- FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- BigBuf_free();
-
- clear_trace();
- set_tracing(TRUE);
+ bool triggered = TRUE; // TODO: set and evaluate trigger condition
+ bool TagIsActive = FALSE;
+ bool ReaderIsActive = FALSE;
+ iso1444b_setup_snoop();
+
// The DMA buffer, used to stream samples from the FPGA
- int8_t *dmaBuf = (int8_t*) BigBuf_malloc(DMA_BUFFER_SIZE);
- int lastRxCounter;
- int8_t *upTo;
- int ci, cq;
- int maxBehindBy = 0;
-
- // Count of samples received so far, so that we can include timing
- // information in the trace buffer.
- int samples = 0;
-
- DemodInit(BigBuf_malloc(MAX_FRAME_SIZE));
- UartInit(BigBuf_malloc(MAX_FRAME_SIZE));
-
- // Print some debug information about the buffer sizes
- Dbprintf("Snooping buffers initialized:");
- Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen());
- Dbprintf(" Reader -> tag: %i bytes", MAX_FRAME_SIZE);
- Dbprintf(" tag -> Reader: %i bytes", MAX_FRAME_SIZE);
- Dbprintf(" DMA: %i bytes", DMA_BUFFER_SIZE);
-
- // Signal field is off with the appropriate LED
- LED_D_OFF();
-
- // And put the FPGA in the appropriate mode
- FpgaWriteConfWord(
- FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ |
- FPGA_HF_READER_RX_XCORR_SNOOP);
- SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-
- // Setup for the DMA.
- FpgaSetupSsc();
- upTo = dmaBuf;
- lastRxCounter = DMA_BUFFER_SIZE;
- FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE);
- uint8_t parity[MAX_PARITY_SIZE];
- LED_A_ON();
+ int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE);
+ int8_t *upTo = dmaBuf;
- bool TagIsActive = FALSE;
- bool ReaderIsActive = FALSE;
+ // Setup and start DMA.
+ if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE) ){
+ if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting");
+ BigBuf_free();
+ return;
+ }
+ time_0 = GetCountSspClk();
+
// And now we loop, receiving samples.
for(;;) {
- int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
- (DMA_BUFFER_SIZE-1);
- if(behindBy > maxBehindBy) {
- maxBehindBy = behindBy;
- if(behindBy > (9*DMA_BUFFER_SIZE/10)) { // TODO: understand whether we can increase/decrease as we want or not?
- Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
- break;
- }
- }
- if(behindBy < 2) continue;
+
+ WDT_HIT();
ci = upTo[0];
cq = upTo[1];
- upTo += 2;
+ upTo += 2;
lastRxCounter -= 2;
- if(upTo >= dmaBuf + DMA_BUFFER_SIZE) {
+
+ if (upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
upTo = dmaBuf;
- lastRxCounter += DMA_BUFFER_SIZE;
+ lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
- AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
+ AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE;
+
+ if (!tracing) {
+ if (MF_DBGLEVEL >= 2) DbpString("Trace full");
+ break;
+ }
+
+ if (BUTTON_PRESS()) {
+ if (MF_DBGLEVEL >= 2) DbpString("cancelled");
+ break;
+ }
}
-
- samples += 2;
-
- if (!TagIsActive) { // no need to try decoding reader data if the tag is sending
- if(Handle14443UartBit(ci & 0x01)) {
- if(triggered && tracing) {
- GetParity(Uart.output, Uart.byteCnt, parity);
- LogTrace(Uart.output,Uart.byteCnt,samples, samples,parity,TRUE);
- }
- if(Uart.byteCnt==0) Dbprintf("[1] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt);
+
+ if (!TagIsActive) {
+
+ LED_A_ON();
+
+ // no need to try decoding reader data if the tag is sending
+ if (Handle14443bReaderUartBit(ci & 0x01)) {
+
+ time_stop = GetCountSspClk() - time_0;
+
+ if (triggered)
+ LogTrace(Uart.output, Uart.byteCnt, time_start, time_stop, NULL, TRUE);
/* And ready to receive another command. */
UartReset();
/* And also reset the demod code, which might have been */
/* false-triggered by the commands from the reader. */
DemodReset();
+ } else {
+ time_start = GetCountSspClk() - time_0;
}
- if(Handle14443UartBit(cq & 0x01)) {
- if(triggered && tracing) {
- GetParity(Uart.output, Uart.byteCnt, parity);
- LogTrace(Uart.output,Uart.byteCnt,samples, samples, parity, TRUE);
- }
- if(Uart.byteCnt==0) Dbprintf("[2] Error, Uart.byteCnt==0, Uart.bitCnt=%d", Uart.bitCnt);
+
+ if (Handle14443bReaderUartBit(cq & 0x01)) {
+
+ time_stop = GetCountSspClk() - time_0;
+
+ if (triggered)
+ LogTrace(Uart.output, Uart.byteCnt, time_start, time_stop, NULL, TRUE);
/* And ready to receive another command. */
UartReset();
/* And also reset the demod code, which might have been */
/* false-triggered by the commands from the reader. */
DemodReset();
+ } else {
+ time_start = GetCountSspClk() - time_0;
}
- ReaderIsActive = (Uart.state != STATE_UNSYNCD);
+ ReaderIsActive = (Uart.state > STATE_GOT_FALLING_EDGE_OF_SOF);
+ LED_A_OFF();
}
+
+ 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
+ // LSB is a fpga signal bit.
+ if (Handle14443bTagSamplesDemod(ci >> 1, cq >> 1)) {
+
+ time_stop = GetCountSspClk() - time_0;
+
+ LogTrace(Demod.output, Demod.len, time_start, time_stop, NULL, FALSE);
- if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time
- if(Handle14443SamplesDemod(ci, cq)) {
-
- //Use samples as a time measurement
- if(tracing)
- {
- uint8_t parity[MAX_PARITY_SIZE];
- GetParity(Demod.output, Demod.len, parity);
- LogTrace(Demod.output, Demod.len,samples, samples, parity, FALSE);
- }
triggered = TRUE;
- LED_A_OFF();
- LED_B_ON();
// And ready to receive another response.
DemodReset();
+ } else {
+ time_start = GetCountSspClk() - time_0;
}
- TagIsActive = (Demod.state != DEMOD_UNSYNCD);
- }
-
- WDT_HIT();
-
- if(!tracing) {
- DbpString("Reached trace limit");
- break;
- }
-
- if(BUTTON_PRESS()) {
- DbpString("cancelled");
- break;
+ TagIsActive = (Demod.state > DEMOD_GOT_FALLING_EDGE_OF_SOF);
}
}
- FpgaDisableSscDma();
- LED_A_OFF();
- LED_B_OFF();
- LED_C_OFF();
- AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
+
+ switch_off(); // Snoop
+
DbpString("Snoop statistics:");
- Dbprintf(" Max behind by: %i", maxBehindBy);
- Dbprintf(" Uart State: %x", Uart.state);
- Dbprintf(" Uart ByteCnt: %i", Uart.byteCnt);
- Dbprintf(" Uart ByteCntMax: %i", Uart.byteCntMax);
+ 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;
+
+ // Uart.byteCntMax should be set with ATQB value..
}
+void iso14b_set_trigger(bool enable) {
+ trigger = enable;
+}
/*
* Send raw command to tag ISO14443B
* @Input
- * datalen len of buffer data
- * recv bool when true wait for data from tag and send to client
- * powerfield bool leave the field on when true
- * data buffer with byte to send
+ * param flags enum ISO14B_COMMAND. (mifare.h)
+ * len len of buffer data
+ * data buffer with bytes to send
*
* @Output
* none
*
*/
-void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[])
+void SendRawCommand14443B_Ex(UsbCommand *c)
{
- FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- if(!powerfield)
- {
+ iso14b_command_t param = c->arg[0];
+ size_t len = c->arg[1] & 0xffff;
+ uint8_t *cmd = c->d.asBytes;
+ uint8_t status = 0;
+ uint32_t sendlen = sizeof(iso14b_card_select_t);
+ uint8_t buf[USB_CMD_DATA_SIZE] = {0x00};
+
+ if (MF_DBGLEVEL > 3) Dbprintf("14b raw: param, %04x", param );
+
+ // turn on trigger (LED_A)
+ if ((param & ISO14B_REQUEST_TRIGGER) == ISO14B_REQUEST_TRIGGER)
+ iso14b_set_trigger(TRUE);
+
+ if ((param & ISO14B_CONNECT) == ISO14B_CONNECT) {
// Make sure that we start from off, since the tags are stateful;
// confusing things will happen if we don't reset them between reads.
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- LED_D_OFF();
- SpinDelay(200);
+ //switch_off(); // before connect in raw
+ iso14443b_setup();
}
+
+ set_tracing(TRUE);
- if(!GETBIT(GPIO_LED_D))
- {
- SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
- FpgaSetupSsc();
-
- // Now give it time to spin up.
- // Signal field is on with the appropriate LED
- LED_D_ON();
- FpgaWriteConfWord(
- FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
- SpinDelay(200);
+ if ((param & ISO14B_SELECT_STD) == ISO14B_SELECT_STD) {
+ iso14b_card_select_t *card = (iso14b_card_select_t*)buf;
+ status = iso14443b_select_card(card);
+ cmd_send(CMD_ACK, status, sendlen, 0, buf, sendlen);
+ // 0: OK 2: attrib fail, 3:crc fail,
+ if ( status > 0 ) return;
+ }
+
+ if ((param & ISO14B_SELECT_SR) == ISO14B_SELECT_SR) {
+ iso14b_card_select_t *card = (iso14b_card_select_t*)buf;
+ status = iso14443b_select_srx_card(card);
+ cmd_send(CMD_ACK, status, sendlen, 0, buf, sendlen);
+ // 0: OK 2: attrib fail, 3:crc fail,
+ if ( status > 0 ) return;
+ }
+
+ if ((param & ISO14B_APDU) == ISO14B_APDU) {
+ status = iso14443b_apdu(cmd, len, buf);
+ cmd_send(CMD_ACK, status, status, 0, buf, status);
}
-
- CodeAndTransmit14443bAsReader(data, datalen);
-
- if(recv)
- {
- GetSamplesFor14443Demod(TRUE, RECEIVE_SAMPLES_TIMEOUT, TRUE);
- uint16_t iLen = MIN(Demod.len,USB_CMD_DATA_SIZE);
- cmd_send(CMD_ACK,iLen,0,0,Demod.output,iLen);
+
+ if ((param & ISO14B_RAW) == ISO14B_RAW) {
+ if((param & ISO14B_APPEND_CRC) == ISO14B_APPEND_CRC) {
+ AppendCrc14443b(cmd, len);
+ len += 2;
+ }
+
+ CodeAndTransmit14443bAsReader(cmd, len); // raw
+ GetTagSamplesFor14443bDemod(); // raw
+
+ sendlen = MIN(Demod.len, USB_CMD_DATA_SIZE);
+ status = (Demod.len > 0) ? 0 : 1;
+ cmd_send(CMD_ACK, status, sendlen, 0, Demod.output, sendlen);
}
- if(!powerfield)
- {
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- LED_D_OFF();
+
+ // turn off trigger (LED_A)
+ if ((param & ISO14B_REQUEST_TRIGGER) == ISO14B_REQUEST_TRIGGER)
+ iso14b_set_trigger(FALSE);
+
+ // turn off antenna et al
+ // we don't send a HALT command.
+ if ((param & ISO14B_DISCONNECT) == ISO14B_DISCONNECT) {
+ if (MF_DBGLEVEL > 3) Dbprintf("disconnect");
+ switch_off(); // disconnect raw
+ } else {
+ //FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD);
}
-}
-
+
+}
\ No newline at end of file
projects / proxmark3-svn / blobdiff