// Routines to support ISO 14443B. This includes both the reader software and
// the `fake tag' modes.
//-----------------------------------------------------------------------------
+#include "iso14443b.h"
-#include "proxmark3.h"
-#include "apps.h"
-#include "util.h"
-#include "string.h"
-#include "iso14443crc.h"
-#include "common.h"
-#define RECEIVE_SAMPLES_TIMEOUT 800000
+#define RECEIVE_SAMPLES_TIMEOUT 50000
#define ISO14443B_DMA_BUFFER_SIZE 256
+// Guard Time (per 14443-2)
+#define TR0 0
+// Synchronization time (per 14443-2)
+#define TR1 0
+// Frame Delay Time PICC to PCD (per 14443-3 Amendment 1)
+#define TR2 0
-// PCB Block number for APDUs
+// 4sample
+//#define SEND4STUFFBIT(x) ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);ToSendStuffBit(x);
+#define SEND4STUFFBIT(x) ToSendStuffBit(x);
+
+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 = RECEIVE_SAMPLES_TIMEOUT;
+// 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
// a UART kind of thing that's implemented in software. When we get a
// 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);
+}
+
+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 (9.44µS)
+ * - A 0-bit input to the FPGA becomes an unmodulated time of 9.44µS
+ *
+ *
+ *
+ * Card sends data ub 847.e kHz subcarrier
+ * 848k = 9.44µS = 128 fc
+ * 424k = 18.88µS = 256 fc
+ * 212k = 37.76µS = 512 fc
+ * 106k = 75.52µS = 1024 fc
+ *
+ * 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)
+ *
+ */
+
+ // ToSendStuffBit, 40 calls
+ // 1 ETU = 1startbit, 1stopbit, 8databits == 10bits.
+ // 1 ETU = 10 * 4 == 40 stuffbits ( ETU_TAG_BIT )
+ 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); }
+
+ // 2-3 ETU * 4times samples ONES
+ for(i = 0; i < 3; i++) { SEND4STUFFBIT(1); }
+
+ // data
+ for(i = 0; i < len; ++i) {
+
// Start bit
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
+ SEND4STUFFBIT(0);
// Data bits
- for(j = 0; j < 8; j++) {
- if(b & 1) {
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
+ b = cmd[i];
+ for(j = 0; j < 8; ++j) {
+ if(b & 1) {
+ SEND4STUFFBIT(1);
} else {
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(0);
+ SEND4STUFFBIT(0);
}
b >>= 1;
}
// Stop bit
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
- ToSendStuffBit(1);
+ SEND4STUFFBIT(1);
+
+ // Extra Guard bit
+ // For PICC it ranges 0-18us (1etu = 9us)
+ SEND4STUFFBIT(1);
}
// Send EOF.
- 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);
- }
-
+ // 10-11 ETU * 4 sample rate = ZEROS
+ for(i = 0; i < 10; i++) { SEND4STUFFBIT(0); }
+
+ // why this?
+ for(i = 0; i < 40; i++) { SEND4STUFFBIT(1); }
+
// Convert from last byte pos to length
- ToSendMax++;
+ ++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;
- uint16_t shiftReg;
- int bitCnt;
- int byteCnt;
- int byteCntMax;
- int posCnt;
- uint8_t *output;
-} Uart;
/* Receive & handle a bit coming from the reader.
*
* Returns: true if we received a EOF
* false if we are still waiting for some more
*/
-static RAMFUNC int Handle14443bUartBit(uint8_t bit)
-{
+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
+ // 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;
return FALSE;
}
-
-static void UartReset()
-{
- Uart.byteCntMax = MAX_FRAME_SIZE;
- Uart.state = STATE_UNSYNCD;
- Uart.byteCnt = 0;
- Uart.bitCnt = 0;
- Uart.posCnt = 0;
- memset(Uart.output, 0x00, MAX_FRAME_SIZE);
-}
-
-
-static void UartInit(uint8_t *data)
-{
- Uart.output = data;
- UartReset();
-}
-
-
//-----------------------------------------------------------------------------
// 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
// Assume that we're called with the SSC (to the FPGA) and ADC path set
// correctly.
//-----------------------------------------------------------------------------
-static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len)
-{
+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;
+ // 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.
UartInit(received);
- for(;;) {
+ b = 0;
+ uint8_t mask;
+ while( !BUTTON_PRESS() ) {
WDT_HIT();
- if(BUTTON_PRESS()) return FALSE;
-
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
- for(uint8_t mask = 0x80; mask != 0x00; mask >>= 1) {
- if(Handle14443bUartBit(b & mask)) {
+ 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;
+}
+
+void ClearFpgaShiftingRegisters(void){
+
+ volatile uint8_t b;
+
+ // clear receiving shift register and holding register
+ while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
+ b = AT91C_BASE_SSC->SSC_RHR; (void) b;
+
+ while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
+ 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;
}
- return FALSE;
+ // Clear TXRDY:
+ AT91C_BASE_SSC->SSC_THR = 0xFF;
+}
+
+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++;
+ }
+ }
}
+static void TransmitFor14443b_AsTag( uint8_t *response, uint16_t len) {
+
+ // 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);
+
+ ClearFpgaShiftingRegisters();
+
+ FpgaSetupSsc();
+
+ // 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];
+ fpgasendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+ }
+ }
+
+ WaitForFpgaDelayQueueIsEmpty(fpgasendQueueDelay);
+}
//-----------------------------------------------------------------------------
// Main loop of simulated tag: receive commands from reader, decide what
// response to send, and send it.
//-----------------------------------------------------------------------------
-void SimulateIso14443bTag(void)
-{
- // the only commands we understand is WUPB, AFI=0, Select All, N=1:
- static const uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 }; // WUPB
- // ... and REQB, AFI=0, Normal Request, N=1:
- static const uint8_t cmd2[] = { 0x05, 0x00, 0x00, 0x71, 0xFF }; // REQB
- // ... and HLTB
- static const uint8_t cmd3[] = { 0x50, 0xff, 0xff, 0xff, 0xff }; // HLTB
- // ... and ATTRIB
- static const uint8_t cmd4[] = { 0x1D, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; // ATTRIB
+void SimulateIso14443bTag(uint32_t pupi) {
- // ... and 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:
- static const uint8_t response1[] = {
- 0x50, 0x82, 0x0d, 0xe1, 0x74, 0x20, 0x38, 0x19, 0x22,
- 0x00, 0x21, 0x85, 0x5e, 0xd7
- };
- // response to HLTB and ATTRIB
- static const uint8_t response2[] = {0x00, 0x78, 0xF0};
-
- uint8_t parity[MAX_PARITY_SIZE];
-
+ ///////////// setup device.
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- clear_trace();
- set_tracing(TRUE);
-
- const uint8_t *resp;
- uint8_t *respCode;
- uint16_t respLen, respCodeLen;
-
// allocate command receive buffer
BigBuf_free();
- uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
-
- uint16_t len;
- uint16_t cmdsRecvd = 0;
-
- // prepare the (only one) tag answer:
- CodeIso14443bAsTag(response1, sizeof(response1));
- uint8_t *resp1Code = BigBuf_malloc(ToSendMax);
- memcpy(resp1Code, ToSend, ToSendMax);
- uint16_t resp1CodeLen = ToSendMax;
-
- // prepare the (other) tag answer:
- CodeIso14443bAsTag(response2, sizeof(response2));
- uint8_t *resp2Code = BigBuf_malloc(ToSendMax);
- memcpy(resp2Code, ToSend, ToSendMax);
- uint16_t resp2CodeLen = ToSendMax;
-
- // We need to listen to the high-frequency, peak-detected path.
+ BigBuf_Clear_ext(false);
+ clear_trace(); //sim
+ set_tracing(TRUE);
+
+ // connect Demodulated Signal to ADC:
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+ // 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
- cmdsRecvd = 0;
+ // ... 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};
- for(;;) {
+ // ...PUPI/UID supplied from user. Adjust ATQB response accordingly
+ if ( pupi > 0 ) {
+ num_to_bytes(pupi, 4, respATQB+1);
+ ComputeCrc14443(CRC_14443_B, respATQB, 12, respATQB+13, respATQB+14);
+ }
- if(!GetIso14443bCommandFromReader(receivedCmd, &len)) {
- Dbprintf("button pressed, received %d commands", cmdsRecvd);
- break;
- }
+ // prepare "ATQB" tag answer (encoded):
+ CodeIso14443bAsTag(respATQB, sizeof(respATQB));
+ uint8_t *encodedATQB = BigBuf_malloc(ToSendMax);
+ uint16_t encodedATQBLen = ToSendMax;
+ memcpy(encodedATQB, ToSend, ToSendMax);
- if (tracing) {
- LogTrace(receivedCmd, len, 0, 0, parity, TRUE);
- }
+
+ // 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();
- // Good, look at the command now.
- if ( (len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len) == 0)
- || (len == sizeof(cmd2) && memcmp(receivedCmd, cmd2, len) == 0) ) {
- resp = response1;
- respLen = sizeof(response1);
- respCode = resp1Code;
- respCodeLen = resp1CodeLen;
- } else if ( (len == sizeof(cmd3) && receivedCmd[0] == cmd3[0])
- || (len == sizeof(cmd4) && receivedCmd[0] == cmd4[0]) ) {
- resp = response2;
- respLen = sizeof(response2);
- respCode = resp2Code;
- respCodeLen = resp2CodeLen;
- } else {
- Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd);
- // And print whether the CRC fails, just for good measure
- uint8_t b1, b2;
- if (len >= 3){ // if crc exists
- ComputeCrc14443(CRC_14443_B, receivedCmd, len-2, &b1, &b2);
- if(b1 != receivedCmd[len-2] || b2 != receivedCmd[len-1]) {
- // Not so good, try again.
- DbpString("+++CRC fail");
-
- } else {
- DbpString("CRC passes");
- }
+ // 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();
}
- //get rid of compiler warning
- respCodeLen = 0;
- resp = response1;
- respLen = 0;
- respCode = resp1Code;
- //don't crash at new command just wait and see if reader will send other new cmds.
- //break;
- }
+ }
+ if (cardSTATE == SIM_NOFIELD) continue;
- cmdsRecvd++;
-
- if(cmdsRecvd > 0x30) {
- DbpString("many commands later...");
+ // Get reader command
+ if (!GetIso14443bCommandFromReader(receivedCmd, &len)) {
+ Dbprintf("button pressed, received %d commands", cmdsReceived);
break;
}
- if(respCodeLen <= 0) continue;
-
- // 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();
-
- uint8_t c;
- // clear receiving shift register and holding register
- while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
- c = AT91C_BASE_SSC->SSC_RHR; (void) c;
- while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
- c = AT91C_BASE_SSC->SSC_RHR; (void) c;
-
- // Clear TXRDY:
- AT91C_BASE_SSC->SSC_THR = 0x00;
-
- // Transmit the response.
- uint16_t FpgaSendQueueDelay = 0;
- uint16_t i = 0;
- for(;i < respCodeLen; ) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = respCode[i++];
- FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+ // 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;
}
- if(BUTTON_PRESS()) break;
}
- // Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again:
- uint8_t fpga_queued_bits = FpgaSendQueueDelay >> 3;
- for (i = 0; i <= fpga_queued_bits/8 + 1; ) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = 0x00;
- FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
- i++;
+ /*
+ * 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;
+ }
+ 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;
+ if(cmdsReceived > 1000) {
+ DbpString("14B Simulate, 1000 commands later...");
+ break;
}
-
- // trace the response:
- if (tracing) LogTrace(resp, respLen, 0, 0, parity, FALSE);
}
- FpgaDisableSscDma();
+ 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
- } state;
- int 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;
- int len;
- int sumI;
- int sumQ;
-} Demod;
-
/*
* Handles reception of a bit from the tag
*
* false if we are still waiting for some more
*
*/
-static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
-{
- int v;
- int ai, aq;
+#ifndef SUBCARRIER_DETECT_THRESHOLD
+# define SUBCARRIER_DETECT_THRESHOLD 8
+#endif
+static RAMFUNC int Handle14443bTagSamplesDemod(int ci, int cq) {
+ int v=0;// , myI, myQ = 0;
// 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() { \
- v = (Demod.sumI > 0) ? ci : -ci;\
+ if(Demod.sumI > 0) { \
+ v = ci; \
+ } else { \
+ v = -ci; \
+ } \
if(Demod.sumQ > 0) { \
v += cq; \
} else { \
} \
}
-#define SUBCARRIER_DETECT_THRESHOLD 8
-
// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by abs(ci) + abs(cq)
-/* #define CHECK_FOR_SUBCARRIER() { \
- v = ci; \
- if(v < 0) v = -v; \
- if(cq > 0) { \
- v += cq; \
- } else { \
- v -= 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() { \
- ai = (abs(ci) >> 1); \
- aq = (abs(cq) >> 1); \
- v = MAX(abs(ci), abs(cq)) + MIN(ai, aq); \
-}
+ 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_un() { \
+ myI = ABS(ci); \
+ myQ = ABS(cq); \
+ v = MAX(myI,myQ) + (MIN(myI,myQ) >> 1); \
+ }
switch(Demod.state) {
case DEMOD_UNSYNCD:
+
CHECK_FOR_SUBCARRIER();
- if(v > SUBCARRIER_DETECT_THRESHOLD) { // subcarrier detected
+
+ // subcarrier detected
+ 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 < 10*2) {
+ 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.posCount;
+ } else {
+ // subcarrier lost
Demod.state = DEMOD_UNSYNCD;
}
} else {
break;
case DEMOD_AWAITING_FALLING_EDGE_OF_SOF:
+
MAKE_SOFT_DECISION();
- //Dbprintf("ICE: %d %d %d %d %d", v, Demod.sumI, Demod.sumQ, ci, cq );
+
if(v < 0) { // logic '0' detected
Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF;
Demod.posCount = 0; // start of SOF sequence
} else {
- if(Demod.posCount > 25*2) { // maximum length of TR1 = 200 1/fs
- Demod.state = DEMOD_UNSYNCD;
- }
+ // maximum length of TR1 = 200 1/fs
+ if(Demod.posCount > 25*2) Demod.state = DEMOD_UNSYNCD;
}
- Demod.posCount++;
+ ++Demod.posCount;
break;
case DEMOD_GOT_FALLING_EDGE_OF_SOF:
- Demod.posCount++;
+ ++Demod.posCount;
+
MAKE_SOFT_DECISION();
+
if(v > 0) {
- if(Demod.posCount < 10*2) { // low phase of SOF too short (< 9 etu). Note: spec is >= 10, but FPGA tends to "smear" edges
+ // low phase of SOF too short (< 9 etu). Note: spec is >= 10, but FPGA tends to "smear" edges
+ if(Demod.posCount < 9*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;
-/* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented.
- Demod.metricN = 0;
- Demod.metric = 0;
-*/
}
} else {
- if(Demod.posCount > 13*2) { // low phase of SOF too long (> 12 etu)
+ // low phase of SOF too long (> 12 etu)
+ if (Demod.posCount > 12*2) {
Demod.state = DEMOD_UNSYNCD;
LED_C_OFF();
}
break;
case DEMOD_AWAITING_START_BIT:
- Demod.posCount++;
+ ++Demod.posCount;
+
MAKE_SOFT_DECISION();
- if(v > 0) {
+
+ if (v > 0) {
if(Demod.posCount > 3*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();
break;
case DEMOD_RECEIVING_DATA:
+
MAKE_SOFT_DECISION();
- if(Demod.posCount == 0) { // first half of bit
+
+ if (Demod.posCount == 0) {
+ // first half of bit
Demod.thisBit = v;
Demod.posCount = 1;
- } else { // second half of bit
+ } else {
+ // second half of bit
Demod.thisBit += v;
-
-/* this had been used to add RSSI (Received Signal Strength Indication) to traces. Currently not implemented.
- if(Demod.thisBit > 0) {
- Demod.metric += Demod.thisBit;
- } else {
- Demod.metric -= Demod.thisBit;
- }
- (Demod.metricN)++;
-*/
-
Demod.shiftReg >>= 1;
- if(Demod.thisBit > 0) { // logic '1'
- Demod.shiftReg |= 0x200;
- }
- Demod.bitCount++;
+ // logic '1'
+ if(Demod.thisBit > 0) Demod.shiftReg |= 0x200;
+
+ ++Demod.bitCount;
+
if(Demod.bitCount == 10) {
+
uint16_t s = Demod.shiftReg;
- if((s & 0x200) && !(s & 0x001)) { // stop bit == '1', start bit == '0'
+
+ // stop bit == '1', start bit == '0'
+ if((s & 0x200) && !(s & 0x001)) {
uint8_t b = (s >> 1);
Demod.output[Demod.len] = b;
- Demod.len++;
+ ++Demod.len;
Demod.state = DEMOD_AWAITING_START_BIT;
} else {
Demod.state = DEMOD_UNSYNCD;
+ Demod.endTime = GetCountSspClk();
LED_C_OFF();
- if(s == 0x000) {
- // This is EOF (start, stop and all data bits == '0'
- return TRUE;
- }
+
+ // This is EOF (start, stop and all data bits == '0'
+ if(s == 0) return TRUE;
}
}
Demod.posCount = 0;
}
-static void DemodReset()
-{
- // Clear out the state of the "UART" that receives from the tag.
- Demod.len = 0;
- Demod.state = DEMOD_UNSYNCD;
- Demod.posCount = 0;
- Demod.sumI = 0;
- Demod.sumQ = 0;
- Demod.bitCount = 0;
- Demod.thisBit = 0;
- Demod.shiftReg = 0;
- memset(Demod.output, 0x00, MAX_FRAME_SIZE);
-}
-
-
-static void DemodInit(uint8_t *data)
-{
- Demod.output = data;
- DemodReset();
-}
-
-
/*
* Demodulate the samples we received from the tag, also log to tracebuffer
* quiet: set to 'TRUE' to disable debug output
*/
-static void GetSamplesFor14443bDemod(int n, bool quiet)
-{
- int max = 0;
+static void GetTagSamplesFor14443bDemod() {
bool gotFrame = FALSE;
- int lastRxCounter, ci, cq, samples = 0;
+ int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
+ int max = 0, ci = 0, cq = 0, samples = 0;
+ uint32_t time_0 = 0, time_stop = 0;
- // Allocate memory from BigBuf for some buffers
- // free all previous allocations first
BigBuf_free();
-
- // And put the FPGA in the appropriate mode
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
-
- // The response (tag -> reader) that we're receiving.
+
// 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(ISO14443B_DMA_BUFFER_SIZE);
-
+ int8_t *upTo = dmaBuf;
+
// Setup and start DMA.
- FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE);
+ if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE) ){
+ if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting");
+ return;
+ }
+
+ time_0 = GetCountSspClk();
+
+ // And put the FPGA in the appropriate mode
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
- int8_t *upTo = dmaBuf;
- lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
+ while( !BUTTON_PRESS() ) {
+ WDT_HIT();
- // Signal field is ON with the appropriate LED:
- LED_D_ON();
- for(;;) {
int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR;
if(behindBy > max) max = behindBy;
- while(((lastRxCounter-AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1)) > 2) {
+ // rx counter - dma counter? (how much?) & (mod) dma buff / 2. (since 2bytes at the time is read)
+ while(((lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1)) > 2) {
+
ci = upTo[0];
cq = upTo[1];
upTo += 2;
+ samples += 2;
+
+ // restart DMA buffer to receive again.
if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
upTo = dmaBuf;
AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE;
}
+
lastRxCounter -= 2;
- if(lastRxCounter <= 0) {
+ if(lastRxCounter <= 0)
lastRxCounter += ISO14443B_DMA_BUFFER_SIZE;
- }
-
- samples += 2;
- //
- gotFrame = Handle14443bSamplesDemod(ci , cq );
- if ( gotFrame )
- break;
+ // is this | 0x01 the error? & 0xfe in https://github.com/Proxmark/proxmark3/issues/103
+ //gotFrame = Handle14443bTagSamplesDemod(ci & 0xfe, cq & 0xfe);
+ gotFrame = Handle14443bTagSamplesDemod(ci, cq);
+ if ( gotFrame ) break;
+ LED_A_INV();
}
- if(samples > n || gotFrame) {
- break;
- }
+ time_stop = GetCountSspClk() - time_0;
+
+ if(time_stop > iso14b_timeout || gotFrame) break;
}
+
+ FpgaDisableSscDma();
- AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
-
- if (!quiet && Demod.len == 0) {
- Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d",
+ if (MF_DBGLEVEL >= 3) {
+ Dbprintf("max behindby = %d, samples = %d, gotFrame = %s, Demod.state = %d, Demod.len = %u",
max,
samples,
- gotFrame,
- Demod.len,
- Demod.sumI,
- Demod.sumQ
+ (gotFrame) ? "true" : "false",
+ Demod.state,
+ Demod.len
);
}
-
- //Tracing
- if (tracing && Demod.len > 0) {
- uint8_t parity[MAX_PARITY_SIZE];
- LogTrace(Demod.output, Demod.len, 0, 0, parity, FALSE);
- }
+ if ( Demod.len > 0 )
+ LogTrace(Demod.output, Demod.len, Demod.startTime, Demod.endTime, NULL, FALSE);
}
//-----------------------------------------------------------------------------
// Transmit the command (to the tag) that was placed in ToSend[].
//-----------------------------------------------------------------------------
-static void TransmitFor14443b(void)
-{
- int c;
-
- FpgaSetupSsc();
-
- while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = 0xff;
- }
+static void TransmitFor14443b_AsReader(void) {
- // 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);
+ SpinDelay(20);
- for(c = 0; c < 10;) {
+ int c;
+ // 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
+
+ // What does this loop do? Is it TR1?
+ for(c = 0; c < 10;) {
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;
- }
- 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;
- }
- }
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
- (void)r;
+ ++c;
}
- WDT_HIT();
}
- LED_B_OFF(); // Finished sending
+ 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 TransmitFor14443b().
//-----------------------------------------------------------------------------
static void CodeIso14443bAsReader(const uint8_t *cmd, int len)
{
- int i, j;
+ /*
+ * Reader data transmission:
+ * - no modulation ONES
+ * - SOF
+ * - Command, data and CRC_B
+ * - EOF
+ * - no modulation ONES
+ *
+ * 1 ETU == 1 BIT!
+ * TR0 - 8 ETUS minimum.
+ */
+ int i;
uint8_t b;
-
+
ToSendReset();
- // Establish initial reference level
- for(i = 0; i < 40; i++) {
- ToSendStuffBit(1);
- }
// Send SOF
- for(i = 0; i < 11; 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);
+ // 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 < 11; 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 < 10; 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.
+ for(i = 0; i < 40 ; ++i) ToSendStuffBit(1);
+
+ // TR1 - Synchronization time
// Convert from last character reference to length
- ToSendMax++;
+ ++ToSendMax;
}
/**
Convenience function to encode, transmit and trace iso 14443b comms
**/
-static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len)
-{
+static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) {
+
CodeIso14443bAsReader(cmd, len);
- TransmitFor14443b();
- if (tracing) {
- uint8_t parity[MAX_PARITY_SIZE];
- LogTrace(cmd,len, 0, 0, parity, TRUE);
- }
+
+ uint32_t time_start = GetCountSspClk();
+
+ TransmitFor14443b_AsReader();
+
+ 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
*/
-int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *response)
+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;
// 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);
+ CodeAndTransmit14443bAsReader(message_frame, message_length + 4); //no
// get response
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT*100, TRUE);
+ GetTagSamplesFor14443bDemod(); //no
if(Demod.len < 3)
- {
return 0;
- }
- // TODO: Check CRC
+
+ // 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;
}
+/**
+* SRx Initialise.
+*/
+uint8_t iso14443b_select_srx_card(iso14b_card_select_t *card )
+{
+ // 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
*/
-int iso14443b_select_card()
+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[] = { 0x05, 0x00, 0x08, 0x39, 0x73 };
+ static const uint8_t wupb[] = { ISO14443B_REQB, 0x00, 0x08, 0x39, 0x73 };
// ATTRIB command (with space for CRC)
- uint8_t attrib[] = { 0x1D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00};
+ 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));
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+ GetTagSamplesFor14443bDemod(); //select_card
+
// ATQB too short?
- if (Demod.len < 14)
- {
- return 2;
+ 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);
}
- // select the tag
- // copy the PUPI to ATTRIB
+ // 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) */
+
+ // 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));
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+ GetTagSamplesFor14443bDemod();//select_card
+
// Answer to ATTRIB too short?
- if(Demod.len < 3)
- {
- return 2;
+ 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;
+
+ // CID
+ if (card) card->cid = Demod.output[0];
+
+ 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 1;
+ 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));
- BigBuf_free();
- // Set up the synchronous serial port
- FpgaSetupSsc();
// connect Demodulated Signal to ADC:
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+ // Set up the synchronous serial port
+ FpgaSetupSsc();
+
// Signal field is on with the appropriate LED
- LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD);
+ SpinDelay(100);
// Start the timer
- //StartCountSspClk();
-
- DemodReset();
- UartReset();
+ StartCountSspClk();
+
+ LED_D_ON();
+ if (MF_DBGLEVEL > 3) Dbprintf("iso1443b_setup Exit");
}
//-----------------------------------------------------------------------------
//
// I tried to be systematic and check every answer of the tag, every CRC, etc...
//-----------------------------------------------------------------------------
-void ReadSTMemoryIso14443b(uint32_t dwLast)
+void ReadSTMemoryIso14443b(uint8_t numofblocks)
{
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- BigBuf_free();
- clear_trace();
+ // Make sure that we start from off, since the tags are stateful;
+ // confusing things will happen if we don't reset them between reads.
+ switch_off(); // before ReadStMemory
+
set_tracing(TRUE);
uint8_t i = 0x00;
- // 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);
-
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
FpgaSetupSsc();
// 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);
+ SpinDelay(20);
// First command: wake up the tag using the INITIATE command
- uint8_t cmd1[] = {0x06, 0x00, 0x97, 0x5b};
- CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+ uint8_t cmd1[] = {ISO14443B_INITIATE, 0x00, 0x97, 0x5b};
+ CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); //no
+ GetTagSamplesFor14443bDemod(); // no
if (Demod.len == 0) {
DbpString("No response from tag");
+ set_tracing(FALSE);
return;
} else {
Dbprintf("Randomly generated Chip ID (+ 2 byte CRC): %02x %02x %02x",
// 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));
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+ CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); //no
+ GetTagSamplesFor14443bDemod(); //no
if (Demod.len != 3) {
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.");
+ 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: %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
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+ 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);
+ set_tracing(FALSE);
return;
}
// The check the CRC of the answer (use cmd1 as temporary variable):
(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));
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+ 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]);
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++;
+
+ 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.
* DMA Buffer - ISO14443B_DMA_BUFFER_SIZE
* Demodulated samples received - all the rest
*/
-void RAMFUNC SnoopIso14443b(void)
-{
+void RAMFUNC SnoopIso14443b(void) {
+
+ uint32_t time_0 = 0, time_start = 0, time_stop = 0;
+
// 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);
-
- // The DMA buffer, used to stream samples from the FPGA
- int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE);
- int lastRxCounter;
- int8_t *upTo;
+ int triggered = TRUE; // TODO: set and evaluate trigger condition
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", ISO14443B_DMA_BUFFER_SIZE);
-
- // Signal field is off, no reader signal, no tag signal
- LEDsoff();
-
- // 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 = ISO14443B_DMA_BUFFER_SIZE;
- FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE);
- uint8_t parity[MAX_PARITY_SIZE];
-
+ //int behindBy = 0;
+ int lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
+
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(ISO14443B_DMA_BUFFER_SIZE);
+ int8_t *upTo = dmaBuf;
+
+ // 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) &
- (ISO14443B_DMA_BUFFER_SIZE-1);
- if(behindBy > maxBehindBy) {
- maxBehindBy = behindBy;
- }
- if(behindBy < 2) continue;
+ WDT_HIT();
+
+ int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1);
+ if ( behindBy > maxBehindBy )
+ maxBehindBy = behindBy;
+
+ if ( behindBy < 2 ) continue;
+
ci = upTo[0];
cq = upTo[1];
upTo += 2;
+
lastRxCounter -= 2;
- if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
+
+ if (upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
upTo = dmaBuf;
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();
- if(behindBy > (9*ISO14443B_DMA_BUFFER_SIZE/10)) { // TODO: understand whether we can increase/decrease as we want or not?
+
+ // 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("Reached trace limit");
+ DbpString("Trace full");
break;
}
+
if(BUTTON_PRESS()) {
DbpString("cancelled");
break;
}
}
+
+ if (!TagIsActive) {
+
+ LED_A_ON();
+
+ // no need to try decoding reader data if the tag is sending
+ if (Handle14443bReaderUartBit(ci & 0x01)) {
- samples += 2;
-
- if (!TagIsActive) { // no need to try decoding reader data if the tag is sending
- if(Handle14443bUartBit(ci & 0x01)) {
- if(triggered && tracing) {
- LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE);
+ 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);
}
- /* 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();
- }
- if(Handle14443bUartBit(cq & 0x01)) {
- if(triggered && tracing) {
- LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE);
+
+ 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);
}
- /* 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();
- }
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
+
+ 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(Handle14443bSamplesDemod(ci | 0x01, cq | 0x01)) {
+ if(Handle14443bTagSamplesDemod(ci & 0xFE, cq & 0xFE)) {
+
+ time_stop = (GetCountSspClk()-time_0);
+
+ LogTrace(Demod.output, Demod.len, time_start, time_stop, NULL, FALSE);
- //Use samples as a time measurement
- if(tracing)
- {
- //uint8_t parity[MAX_PARITY_SIZE];
- LogTrace(Demod.output, Demod.len, samples, samples, parity, FALSE);
- }
- triggered = TRUE;
+ triggered = TRUE;
- // And ready to receive another response.
- DemodReset();
- }
+ // And ready to receive another response.
+ DemodReset();
+ } else {
+ time_start = (GetCountSspClk()-time_0);
+ }
TagIsActive = (Demod.state > DEMOD_GOT_FALLING_EDGE_OF_SOF);
}
-
}
- FpgaDisableSscDma();
- LEDsoff();
- 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 ( dmaBuf ) dmaBuf = NULL;
+ 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)
{
- iso14443b_setup();
+ 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 );
- if ( datalen == 0 && recv == 0 && powerfield == 0){
-
- } else {
- set_tracing(TRUE);
- CodeAndTransmit14443bAsReader(data, datalen);
+ // 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.
+ //switch_off(); // before connect in raw
+ iso14443b_setup();
}
+
+ set_tracing(TRUE);
- if(recv) {
- GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, FALSE);
- uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE);
- cmd_send(CMD_ACK, iLen, 0, 0, Demod.output, iLen);
+ 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);
}
- if(!powerfield) {
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- FpgaDisableSscDma();
- LED_D_OFF();
+ 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);
}
-}
-
+
+ // 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