//static void GetSamplesFor14443(int weTx, int n);
-#define DEMOD_TRACE_SIZE 4096
+/*#define DEMOD_TRACE_SIZE 4096
#define READER_TAG_BUFFER_SIZE 2048
#define TAG_READER_BUFFER_SIZE 2048
#define DEMOD_DMA_BUFFER_SIZE 1024
-
+*/
//=============================================================================
// 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
//-----------------------------------------------------------------------------
static void CodeIso14443bAsTag(const uint8_t *cmd, int len)
{
- int i;
-
- 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);
- }
-
- // 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];
-
- // Start bit
- ToSendStuffBit(0);
- ToSendStuffBit(0);
- ToSendStuffBit(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 >>= 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);
- }
-
- // Convert from last byte pos to length
- ToSendMax++;
-
- // Add a few more for slop
- ToSendMax += 2;
+ int i;
+
+ 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);
+ }
+
+ // 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];
+
+ // Start bit
+ ToSendStuffBit(0);
+ ToSendStuffBit(0);
+ ToSendStuffBit(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 >>= 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);
+ }
+
+ // Convert from last byte pos to length
+ ToSendMax++;
+
+ // Add a few more for slop
+ ToSendMax += 2;
}
//-----------------------------------------------------------------------------
// 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;
+ 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.
*/
static int Handle14443UartBit(int bit)
{
- switch(Uart.state) {
- case STATE_UNSYNCD:
- LED_A_OFF();
- 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;
- }
- break;
-
- case STATE_GOT_FALLING_EDGE_OF_SOF:
- Uart.posCnt++;
- if(Uart.posCnt == 2) {
- if(bit) {
- if(Uart.bitCnt >= 10) {
- // we've seen enough consecutive
- // zeros that it's a valid SOF
- Uart.posCnt = 0;
- Uart.byteCnt = 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;
- }
- } 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;
- }
- 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;
- }
- } else {
- // falling edge, this starts the data byte
- Uart.posCnt = 0;
- 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) {
- // time to sample a bit
- Uart.shiftReg >>= 1;
- if(bit) {
- Uart.shiftReg |= 0x200;
- }
- Uart.bitCnt++;
- }
- if(Uart.posCnt >= 4) {
- Uart.posCnt = 0;
- }
- 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) {
- // Buffer overflowed, give up
- Uart.posCnt = 0;
- Uart.state = STATE_ERROR_WAIT;
- } else {
- // so get the next byte now
- Uart.posCnt = 0;
- Uart.state = STATE_AWAITING_START_BIT;
- }
- } else if(Uart.shiftReg == 0x000) {
- // this is an EOF byte
- LED_A_OFF(); // Finished receiving
- return TRUE;
- } else {
- // this is an error
- Uart.posCnt = 0;
- Uart.state = STATE_ERROR_WAIT;
- }
- }
- 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:
- Uart.state = STATE_UNSYNCD;
- break;
- }
-
- // This row make the error blew circular buffer in hf 14b snoop
- //if (Uart.state == STATE_ERROR_WAIT) LED_A_OFF(); // Error
-
- return FALSE;
+ switch(Uart.state) {
+ case STATE_UNSYNCD:
+ LED_A_OFF();
+ 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;
+ }
+ break;
+
+ case STATE_GOT_FALLING_EDGE_OF_SOF:
+ Uart.posCnt++;
+ if(Uart.posCnt == 2) {
+ if(bit) {
+ if(Uart.bitCnt >= 10) {
+ // we've seen enough consecutive
+ // zeros that it's a valid SOF
+ Uart.posCnt = 0;
+ Uart.byteCnt = 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;
+ }
+ } 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;
+ }
+ 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;
+ }
+ } else {
+ // falling edge, this starts the data byte
+ Uart.posCnt = 0;
+ 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) {
+ // time to sample a bit
+ Uart.shiftReg >>= 1;
+ if(bit) {
+ Uart.shiftReg |= 0x200;
+ }
+ Uart.bitCnt++;
+ }
+ if(Uart.posCnt >= 4) {
+ Uart.posCnt = 0;
+ }
+ 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) {
+ // Buffer overflowed, give up
+ Uart.posCnt = 0;
+ Uart.state = STATE_ERROR_WAIT;
+ } else {
+ // so get the next byte now
+ Uart.posCnt = 0;
+ Uart.state = STATE_AWAITING_START_BIT;
+ }
+ } else if(Uart.shiftReg == 0x000) {
+ // this is an EOF byte
+ LED_A_OFF(); // Finished receiving
+ return TRUE;
+ } else {
+ // this is an error
+ Uart.posCnt = 0;
+ Uart.state = STATE_ERROR_WAIT;
+ }
+ }
+ 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:
+ Uart.state = STATE_UNSYNCD;
+ break;
+ }
+
+ // This row make the error blew circular buffer in hf 14b snoop
+ //if (Uart.state == STATE_ERROR_WAIT) LED_A_OFF(); // Error
+
+ return FALSE;
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
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
- // 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);
-
-
- // Now run a `software UART' on the stream of incoming samples.
- Uart.output = received;
- Uart.byteCntMax = maxLen;
- Uart.state = STATE_UNSYNCD;
-
- for(;;) {
- 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)) {
- *len = Uart.byteCnt;
- return TRUE;
- }
- }
- }
- }
+ uint8_t mask;
+ int i, bit;
+
+ // Set FPGA mode to "simulated ISO 14443 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);
+
+
+ // Now run a `software UART' on the stream of incoming samples.
+ Uart.output = received;
+ Uart.byteCntMax = maxLen;
+ Uart.state = STATE_UNSYNCD;
+
+ for(;;) {
+ 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)) {
+ *len = Uart.byteCnt;
+ return TRUE;
+ }
+ }
+ }
+ }
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
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
- };
+ 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
+ };
- uint8_t *resp;
- int respLen;
+ uint8_t *resp;
+ int respLen;
- uint8_t *resp1 = BigBuf_get_addr() + 800;
- int resp1Len;
+ uint8_t *resp1 = BigBuf_get_addr() + 800;
+ int resp1Len;
- uint8_t *receivedCmd = BigBuf_get_addr();
- int len;
+ uint8_t *receivedCmd = BigBuf_get_addr();
+ int len;
- int i;
+ int i;
- int cmdsRecvd = 0;
+ int cmdsRecvd = 0;
- FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- memset(receivedCmd, 0x44, 400);
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ memset(receivedCmd, 0x44, 400);
- CodeIso14443bAsTag(response1, sizeof(response1));
- memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
+ CodeIso14443bAsTag(response1, sizeof(response1));
+ memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
- // We need to listen to the high-frequency, peak-detected path.
- SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
- FpgaSetupSsc();
+ // We need to listen to the high-frequency, peak-detected path.
+ SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+ FpgaSetupSsc();
- cmdsRecvd = 0;
+ cmdsRecvd = 0;
- for(;;) {
- uint8_t b1, b2;
+ for(;;) {
+ uint8_t b1, b2;
- if(!GetIso14443CommandFromReader(receivedCmd, &len, 100)) {
+ 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;
- }
-
- memset(receivedCmd, 0x44, 32);
-
- cmdsRecvd++;
-
- if(cmdsRecvd > 0x30) {
- DbpString("many commands later...");
- break;
- }
-
- if(respLen <= 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();
-
- // Transmit the response.
- i = 0;
- for(;;) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- uint8_t b = resp[i];
-
- AT91C_BASE_SSC->SSC_THR = b;
-
- i++;
- if(i > respLen) {
- break;
- }
- }
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
- (void)b;
- }
- }
- }
+ }
+
+ // 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;
+ }
+
+ memset(receivedCmd, 0x44, 32);
+
+ cmdsRecvd++;
+
+ if(cmdsRecvd > 0x30) {
+ DbpString("many commands later...");
+ break;
+ }
+
+ if(respLen <= 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();
+
+ // Transmit the response.
+ i = 0;
+ for(;;) {
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ uint8_t b = resp[i];
+
+ AT91C_BASE_SSC->SSC_THR = b;
+
+ i++;
+ if(i > respLen) {
+ break;
+ }
+ }
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+ volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+ (void)b;
+ }
+ }
+ }
}
//=============================================================================
//=============================================================================
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;
+ 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;
/*
*/
static RAMFUNC int Handle14443SamplesDemod(int ci, int cq)
{
- int v;
+ int v;
- // 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; \
- } else { \
- v = -ci; \
- } \
- if(Demod.sumQ > 0) { \
- v += cq; \
- } else { \
- v -= cq; \
- } \
- }
-
- 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;
- Demod.state = DEMOD_PHASE_REF_TRAINING;
- Demod.sumI = 0;
- Demod.sumQ = 0;
- }
- 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;
- }
- }
- Demod.posCount++;
- break;
-
- case DEMOD_AWAITING_FALLING_EDGE_OF_SOF:
- MAKE_SOFT_DECISION();
- if(v < 0) {
- Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF;
- Demod.posCount = 0;
- } else {
- if(Demod.posCount > 100) {
- Demod.state = DEMOD_UNSYNCD;
- }
- }
- Demod.posCount++;
- break;
-
- case DEMOD_GOT_FALLING_EDGE_OF_SOF:
- MAKE_SOFT_DECISION();
- if(v > 0) {
- if(Demod.posCount < 12) {
- Demod.state = DEMOD_UNSYNCD;
- } else {
- LED_C_ON(); // Got SOF
- Demod.state = DEMOD_AWAITING_START_BIT;
- Demod.posCount = 0;
- Demod.len = 0;
- Demod.metricN = 0;
- Demod.metric = 0;
- }
- } else {
- if(Demod.posCount > 100) {
- Demod.state = DEMOD_UNSYNCD;
- }
- }
- Demod.posCount++;
- break;
-
- case DEMOD_AWAITING_START_BIT:
- MAKE_SOFT_DECISION();
- if(v > 0) {
- if(Demod.posCount > 10) {
- Demod.state = DEMOD_UNSYNCD;
- }
- } else {
- Demod.bitCount = 0;
- Demod.posCount = 1;
- Demod.thisBit = v;
- Demod.shiftReg = 0;
- Demod.state = DEMOD_RECEIVING_DATA;
- }
- break;
-
- case DEMOD_RECEIVING_DATA:
- MAKE_SOFT_DECISION();
- if(Demod.posCount == 0) {
- Demod.thisBit = v;
- Demod.posCount = 1;
- } else {
- Demod.thisBit += v;
-
- 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;
- }
-
- Demod.bitCount++;
- 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++;
- Demod.state = DEMOD_AWAITING_START_BIT;
- } else if(s == 0x000) {
- // This is EOF
- LED_C_OFF();
- Demod.state = DEMOD_UNSYNCD;
- return TRUE;
- } else {
- Demod.state = DEMOD_UNSYNCD;
- }
- }
- Demod.posCount = 0;
- }
- break;
-
- default:
- Demod.state = DEMOD_UNSYNCD;
- break;
- }
-
- if (Demod.state == DEMOD_UNSYNCD) LED_C_OFF(); // Not synchronized...
- return FALSE;
+ if(Demod.sumI > 0) { \
+ v = ci; \
+ } else { \
+ v = -ci; \
+ } \
+ if(Demod.sumQ > 0) { \
+ v += cq; \
+ } else { \
+ v -= cq; \
+ } \
+ }
+
+ 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;
+ Demod.state = DEMOD_PHASE_REF_TRAINING;
+ Demod.sumI = 0;
+ Demod.sumQ = 0;
+ }
+ 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;
+ }
+ }
+ Demod.posCount++;
+ break;
+
+ case DEMOD_AWAITING_FALLING_EDGE_OF_SOF:
+ MAKE_SOFT_DECISION();
+ if(v < 0) {
+ Demod.state = DEMOD_GOT_FALLING_EDGE_OF_SOF;
+ Demod.posCount = 0;
+ } else {
+ if(Demod.posCount > 100) {
+ Demod.state = DEMOD_UNSYNCD;
+ }
+ }
+ Demod.posCount++;
+ break;
+
+ case DEMOD_GOT_FALLING_EDGE_OF_SOF:
+ MAKE_SOFT_DECISION();
+ if(v > 0) {
+ if(Demod.posCount < 12) {
+ Demod.state = DEMOD_UNSYNCD;
+ } else {
+ LED_C_ON(); // Got SOF
+ Demod.state = DEMOD_AWAITING_START_BIT;
+ Demod.posCount = 0;
+ Demod.len = 0;
+ Demod.metricN = 0;
+ Demod.metric = 0;
+ }
+ } else {
+ if(Demod.posCount > 100) {
+ Demod.state = DEMOD_UNSYNCD;
+ }
+ }
+ Demod.posCount++;
+ break;
+
+ case DEMOD_AWAITING_START_BIT:
+ MAKE_SOFT_DECISION();
+ if(v > 0) {
+ if(Demod.posCount > 10) {
+ Demod.state = DEMOD_UNSYNCD;
+ }
+ } else {
+ Demod.bitCount = 0;
+ Demod.posCount = 1;
+ Demod.thisBit = v;
+ Demod.shiftReg = 0;
+ Demod.state = DEMOD_RECEIVING_DATA;
+ }
+ break;
+
+ case DEMOD_RECEIVING_DATA:
+ MAKE_SOFT_DECISION();
+ if(Demod.posCount == 0) {
+ Demod.thisBit = v;
+ Demod.posCount = 1;
+ } else {
+ Demod.thisBit += v;
+
+ 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;
+ }
+
+ Demod.bitCount++;
+ 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++;
+ Demod.state = DEMOD_AWAITING_START_BIT;
+ } else if(s == 0x000) {
+ // This is EOF
+ LED_C_OFF();
+ Demod.state = DEMOD_UNSYNCD;
+ return TRUE;
+ } else {
+ Demod.state = DEMOD_UNSYNCD;
+ }
+ }
+ Demod.posCount = 0;
+ }
+ break;
+
+ default:
+ Demod.state = DEMOD_UNSYNCD;
+ 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
+ * 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;
-
-//# define DMA_BUFFER_SIZE 8
- uint8_t *dmaBuf;
-
- int lastRxCounter;
- uint8_t *upTo;
-
- int ci, cq;
-
- int samples = 0;
-
- // Clear out the state of the "UART" that receives from the tag.
- uint8_t *BigBuf = BigBuf_get_addr();
- memset(BigBuf, 0x00, 400);
- Demod.output = BigBuf;
- Demod.len = 0;
- Demod.state = DEMOD_UNSYNCD;
-
- // And the UART that receives from the reader
- Uart.output = BigBuf + 1024;
- Uart.byteCntMax = 100;
- Uart.state = STATE_UNSYNCD;
-
- // Setup for the DMA.
- dmaBuf = BigBuf + 32;
- upTo = dmaBuf;
- lastRxCounter = DEMOD_DMA_BUFFER_SIZE;
- FpgaSetupSscDma(dmaBuf, DEMOD_DMA_BUFFER_SIZE);
-
- // 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) & (DEMOD_DMA_BUFFER_SIZE-1))
- > 2)
- {
- ci = upTo[0];
- cq = upTo[1];
- upTo += 2;
- if(upTo - dmaBuf > DEMOD_DMA_BUFFER_SIZE) {
- upTo -= DEMOD_DMA_BUFFER_SIZE;
- AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
- AT91C_BASE_PDC_SSC->PDC_RNCR = DEMOD_DMA_BUFFER_SIZE;
- }
- lastRxCounter -= 2;
- if(lastRxCounter <= 0) {
- lastRxCounter += DEMOD_DMA_BUFFER_SIZE;
- }
-
- samples += 2;
-
- Handle14443UartBit(1);
- Handle14443UartBit(1);
-
- if(Handle14443SamplesDemod(ci, cq)) {
- gotFrame = 1;
- }
- }
-
- if(samples > 2000) {
- break;
- }
- }
- AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
- if (!quiet) Dbprintf("%x %x %x", max, gotFrame, Demod.len);
+ int max = 0;
+ int gotFrame = FALSE;
+ int lastRxCounter, ci, cq, samples = 0;
+
+ // Allocate memory from BigBuf for some buffers
+ // free all previous allocations first
+ BigBuf_free();
+
+ // The command (reader -> tag) that we're receiving.
+ uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
+
+ // The response (tag -> reader) that we're receiving.
+ uint8_t *receivedResponse = BigBuf_malloc(MAX_FRAME_SIZE);
+
+ // The DMA buffer, used to stream samples from the FPGA
+ uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
+
+ // Set up the demodulator for tag -> reader responses.
+ DemodInit(receivedResponse);
+ // Set up the demodulator for the reader -> tag commands
+ UartInit(receivedCmd);
+
+ // Setup and start DMA.
+ FpgaSetupSscDma(dmaBuf, DMA_BUFFER_SIZE);
+
+ uint8_t *upTo= dmaBuf;
+ lastRxCounter = DMA_BUFFER_SIZE;
+
+ // 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 -= DMA_BUFFER_SIZE;
+ 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;
+
+ Handle14443UartBit(1);
+ Handle14443UartBit(1);
+
+ if(Handle14443SamplesDemod(ci, cq)) {
+ gotFrame = 1;
+ }
+ }
+
+ if(samples > 2000) {
+ 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);
+ }
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/*static void GetSamplesFor14443(int weTx, int n)
{
- uint8_t *dest = (uint8_t *)BigBuf;
- int c;
-
- FpgaWriteConfWord(
- FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ |
- (weTx ? 0 : FPGA_HF_READER_RX_XCORR_SNOOP));
-
- c = 0;
- for(;;) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = 0x43;
- }
- 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;
-
- if(c >= n) {
- break;
- }
- }
- }
+ uint8_t *dest = (uint8_t *)BigBuf;
+ int c;
+
+ FpgaWriteConfWord(
+ FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ |
+ (weTx ? 0 : FPGA_HF_READER_RX_XCORR_SNOOP));
+
+ c = 0;
+ for(;;) {
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ AT91C_BASE_SSC->SSC_THR = 0x43;
+ }
+ 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;
+
+ if(c >= n) {
+ break;
+ }
+ }
+ }
}*/
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
static void TransmitFor14443(void)
{
- int c;
+ int c;
- FpgaSetupSsc();
+ FpgaSetupSsc();
- while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- AT91C_BASE_SSC->SSC_THR = 0xff;
- }
+ while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ AT91C_BASE_SSC->SSC_THR = 0xff;
+ }
- // Signal field is ON with the appropriate Red LED
+ // 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;) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
- 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(;;) {
- 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;
- }
- WDT_HIT();
- }
- LED_B_OFF(); // Finished sending
+ FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD);
+
+ for(c = 0; c < 10;) {
+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+ 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(;;) {
+ 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;
+ }
+ WDT_HIT();
+ }
+ LED_B_OFF(); // Finished sending
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
static void CodeIso14443bAsReader(const uint8_t *cmd, int len)
{
- int i, j;
- uint8_t b;
-
- ToSendReset();
-
- // Establish initial reference level
- for(i = 0; i < 40; i++) {
- ToSendStuffBit(1);
- }
- // Send SOF
- for(i = 0; i < 10; i++) {
- ToSendStuffBit(0);
- }
-
- for(i = 0; i < len; i++) {
- // Stop bits/EGT
- ToSendStuffBit(1);
- 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);
- }
-
- // Convert from last character reference to length
- ToSendMax++;
+ int i, j;
+ uint8_t b;
+
+ ToSendReset();
+
+ // Establish initial reference level
+ for(i = 0; i < 40; i++) {
+ ToSendStuffBit(1);
+ }
+ // Send SOF
+ for(i = 0; i < 10; i++) {
+ ToSendStuffBit(0);
+ }
+
+ for(i = 0; i < len; i++) {
+ // Stop bits/EGT
+ ToSendStuffBit(1);
+ 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);
+ }
+
+ // Convert from last character reference to length
+ ToSendMax++;
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
void AcquireRawAdcSamplesIso14443(uint32_t parameter)
{
- uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 };
+ uint8_t cmd1[] = { 0x05, 0x00, 0x08, 0x39, 0x73 };
- SendRawCommand14443B(sizeof(cmd1),1,1,cmd1);
+ SendRawCommand14443B(sizeof(cmd1),1,1,cmd1);
+}
+
+/**
+ Convenience function to encode, transmit and trace iso 14443b comms
+ **/
+static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len)
+{
+ CodeIso14443bAsReader(cmd, len);
+ TransmitFor14443();
+ if (tracing) {
+ uint8_t parity[MAX_PARITY_SIZE];
+ GetParity(cmd, len, parity);
+ LogTrace(cmd,len, 0, 0, parity, TRUE);
+ }
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
void ReadSTMemoryIso14443(uint32_t dwLast)
{
- 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);
-
- 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);
-
- // First command: wake up the tag using the INITIATE command
- uint8_t cmd1[] = { 0x06, 0x00, 0x97, 0x5b};
- CodeIso14443bAsReader(cmd1, sizeof(cmd1));
- TransmitFor14443();
+ 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);
+
+ 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);
+
+ // 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, 2000,TRUE);
+ GetSamplesFor14443Demod(TRUE, 2000,TRUE);
// LED_A_OFF();
- if (Demod.len == 0) {
+ if (Demod.len == 0) {
DbpString("No response from tag");
return;
- } else {
+ } else {
Dbprintf("Randomly generated UID from tag (+ 2 byte CRC): %x %x %x",
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[1] = Demod.output[0];
- ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]);
- CodeIso14443bAsReader(cmd1, sizeof(cmd1));
- TransmitFor14443();
+ }
+ // There is a response, SELECT the uid
+ DbpString("Now SELECT tag:");
+ cmd1[0] = 0x0E; // 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, 2000,TRUE);
+ GetSamplesFor14443Demod(TRUE, 2000,TRUE);
// LED_A_OFF();
- if (Demod.len != 3) {
+ if (Demod.len != 3) {
Dbprintf("Expected 3 bytes from tag, got %d", Demod.len);
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]) {
+ }
+ // 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;
- }
- // Check response from the tag: should be the same UID as the command we just sent:
- if (cmd1[1] != Demod.output[0]) {
+ }
+ // 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;
- }
- // Tag is now selected,
- // First get the tag's UID:
- cmd1[0] = 0x0B;
- ComputeCrc14443(CRC_14443_B, cmd1, 1 , &cmd1[1], &cmd1[2]);
- CodeIso14443bAsReader(cmd1, 3); // Only first three bytes for this one
- TransmitFor14443();
+ }
+ // Tag is now selected,
+ // First get the tag's UID:
+ cmd1[0] = 0x0B;
+ 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, 2000,TRUE);
+ GetSamplesFor14443Demod(TRUE, 2000,TRUE);
// LED_A_OFF();
- if (Demod.len != 10) {
+ if (Demod.len != 10) {
Dbprintf("Expected 10 bytes from tag, got %d", Demod.len);
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]) {
+ }
+ // 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]);
// Do not return;, let's go on... (we should retry, maybe ?)
- }
- Dbprintf("Tag UID (64 bits): %08x %08x",
+ }
+ 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]);
- // Now loop to read all 16 blocks, address from 0 to last block
- Dbprintf("Tag memory dump, block 0 to %d",dwLast);
- cmd1[0] = 0x08;
- i = 0x00;
- dwLast++;
- for (;;) {
- if (i == dwLast) {
- DbpString("System area block (0xff):");
- i = 0xff;
- }
- cmd1[1] = i;
- ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]);
- CodeIso14443bAsReader(cmd1, sizeof(cmd1));
- TransmitFor14443();
+ // Now loop to read all 16 blocks, address from 0 to last block
+ Dbprintf("Tag memory dump, block 0 to %d",dwLast);
+ cmd1[0] = 0x08;
+ i = 0x00;
+ dwLast++;
+ for (;;) {
+ if (i == dwLast) {
+ 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, 2000,TRUE);
+ GetSamplesFor14443Demod(TRUE, 2000,TRUE);
// LED_A_OFF();
- if (Demod.len != 6) { // Check if we got an answer from the tag
+ if (Demod.len != 6) { // Check if we got an answer from the tag
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]) {
+ }
+ // 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]);
// 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,
+ }
+ // 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) {
+ if (i == 0xff) {
break;
- }
- i++;
- }
+ }
+ i++;
+ }
}
*/
void RAMFUNC SnoopIso14443(void)
{
- // 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;
+ // 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;
- FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
BigBuf_free();
- // The command (reader -> tag) that we're working on receiving.
- uint8_t *receivedCmd = BigBuf_malloc(READER_TAG_BUFFER_SIZE);
- // The response (tag -> reader) that we're working on receiving.
- uint8_t *receivedResponse = BigBuf_malloc(TAG_READER_BUFFER_SIZE);
-
- // As we receive stuff, we copy it from receivedCmd or receivedResponse
- // into trace, along with its length and other annotations.
- uint8_t *trace = BigBuf_get_addr();
- traceLen = 0;
-
- // The DMA buffer, used to stream samples from the FPGA.
- uint8_t *dmaBuf = BigBuf_malloc(DEMOD_DMA_BUFFER_SIZE);
- int lastRxCounter;
- uint8_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;
-
- // Initialize the trace buffer
- memset(trace, 0x44, BigBuf_max_traceLen());
-
- // Set up the demodulator for tag -> reader responses.
- Demod.output = receivedResponse;
- Demod.len = 0;
- Demod.state = DEMOD_UNSYNCD;
-
- // And the reader -> tag commands
- memset(&Uart, 0, sizeof(Uart));
- Uart.output = receivedCmd;
- Uart.byteCntMax = 100;
- Uart.state = STATE_UNSYNCD;
-
- // Print some debug information about the buffer sizes
- Dbprintf("Snooping buffers initialized:");
- Dbprintf(" Trace: %i bytes", BigBuf_max_traceLen());
- Dbprintf(" Reader -> tag: %i bytes", READER_TAG_BUFFER_SIZE);
- Dbprintf(" tag -> Reader: %i bytes", TAG_READER_BUFFER_SIZE);
- Dbprintf(" DMA: %i bytes", DEMOD_DMA_BUFFER_SIZE);
-
- // And put the FPGA in the appropriate mode
- // Signal field is off with the appropriate LED
- LED_D_OFF();
- 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 = DEMOD_DMA_BUFFER_SIZE;
- FpgaSetupSscDma((uint8_t *)dmaBuf, DEMOD_DMA_BUFFER_SIZE);
-
- LED_A_ON();
-
- // And now we loop, receiving samples.
- for(;;) {
- int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
- (DEMOD_DMA_BUFFER_SIZE-1);
- if(behindBy > maxBehindBy) {
- maxBehindBy = behindBy;
- if(behindBy > (9*DEMOD_DMA_BUFFER_SIZE/10)) { // TODO: understand whether we can increase/decrease as we want or not?
- Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
- goto done;
- }
- }
- if(behindBy < 2) continue;
-
- ci = upTo[0];
- cq = upTo[1];
- upTo += 2;
- lastRxCounter -= 2;
- if(upTo - dmaBuf > DEMOD_DMA_BUFFER_SIZE) {
- upTo -= DEMOD_DMA_BUFFER_SIZE;
- lastRxCounter += DEMOD_DMA_BUFFER_SIZE;
- AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
- AT91C_BASE_PDC_SSC->PDC_RNCR = DEMOD_DMA_BUFFER_SIZE;
- }
-
- samples += 2;
-
-#define HANDLE_BIT_IF_BODY \
- if(triggered) { \
- trace[traceLen++] = ((samples >> 0) & 0xff); \
- trace[traceLen++] = ((samples >> 8) & 0xff); \
- trace[traceLen++] = ((samples >> 16) & 0xff); \
- trace[traceLen++] = ((samples >> 24) & 0xff); \
- trace[traceLen++] = 0; \
- trace[traceLen++] = 0; \
- trace[traceLen++] = 0; \
- trace[traceLen++] = 0; \
- trace[traceLen++] = Uart.byteCnt; \
- memcpy(trace+traceLen, receivedCmd, Uart.byteCnt); \
- traceLen += Uart.byteCnt; \
- if(traceLen > 1000) break; \
- } \
- /* And ready to receive another command. */ \
- memset(&Uart, 0, sizeof(Uart)); \
- Uart.output = receivedCmd; \
- Uart.byteCntMax = 100; \
- Uart.state = STATE_UNSYNCD; \
- /* And also reset the demod code, which might have been */ \
- /* false-triggered by the commands from the reader. */ \
- memset(&Demod, 0, sizeof(Demod)); \
- Demod.output = receivedResponse; \
- Demod.state = DEMOD_UNSYNCD; \
-
- if(Handle14443UartBit(ci & 1)) {
- HANDLE_BIT_IF_BODY
- }
- if(Handle14443UartBit(cq & 1)) {
- HANDLE_BIT_IF_BODY
- }
-
- if(Handle14443SamplesDemod(ci, cq)) {
- // timestamp, as a count of samples
- trace[traceLen++] = ((samples >> 0) & 0xff);
- trace[traceLen++] = ((samples >> 8) & 0xff);
- trace[traceLen++] = ((samples >> 16) & 0xff);
- trace[traceLen++] = 0x80 | ((samples >> 24) & 0xff);
- // correlation metric (~signal strength estimate)
- if(Demod.metricN != 0) {
- Demod.metric /= Demod.metricN;
- }
- trace[traceLen++] = ((Demod.metric >> 0) & 0xff);
- trace[traceLen++] = ((Demod.metric >> 8) & 0xff);
- trace[traceLen++] = ((Demod.metric >> 16) & 0xff);
- trace[traceLen++] = ((Demod.metric >> 24) & 0xff);
- // length
- trace[traceLen++] = Demod.len;
- memcpy(trace+traceLen, receivedResponse, Demod.len);
- traceLen += Demod.len;
- if(traceLen > BigBuf_max_traceLen()) {
- DbpString("Reached trace limit");
- goto done;
- }
- triggered = TRUE;
- LED_A_OFF();
- LED_B_ON();
+ clear_trace();
+ set_tracing(TRUE);
+
+ // The DMA buffer, used to stream samples from the FPGA
+ uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
+ int lastRxCounter;
+ uint8_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;
- // And ready to receive another response.
- memset(&Demod, 0, sizeof(Demod));
- Demod.output = receivedResponse;
- Demod.state = DEMOD_UNSYNCD;
- }
- WDT_HIT();
+ DemodInit(BigBuf_malloc(MAX_FRAME_SIZE));
+ UartInit(BigBuf_malloc(MAX_FRAME_SIZE));
- if(BUTTON_PRESS()) {
- DbpString("cancelled");
- goto done;
- }
- }
+ // 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);
-done:
+ // 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();
+
+ // 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;
+
+ ci = upTo[0];
+ cq = upTo[1];
+ upTo += 2;
+ lastRxCounter -= 2;
+ if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
+ upTo -= DMA_BUFFER_SIZE;
+ lastRxCounter += DMA_BUFFER_SIZE;
+ AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
+ AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
+ }
+
+ samples += 2;
+
+ if(Handle14443UartBit(ci & 1)) {
+ 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);
+
+ /* 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(Handle14443UartBit(cq & 1)) {
+ 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);
+
+ /* 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(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();
+ }
+ WDT_HIT();
+
+ if(!tracing) {
+ DbpString("Reached trace limit");
+ break;
+ }
+
+ if(BUTTON_PRESS()) {
+ DbpString("cancelled");
+ break;
+ }
+ }
+ FpgaDisableSscDma();
LED_A_OFF();
LED_B_OFF();
LED_C_OFF();
void SendRawCommand14443B(uint32_t datalen, uint32_t recv,uint8_t powerfield, uint8_t data[])
{
- FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
- if(!powerfield)
- {
- // 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);
- }
-
- 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);
- }
-
- CodeIso14443bAsReader(data, datalen);
- TransmitFor14443();
- if(recv)
- {
- uint16_t iLen = MIN(Demod.len,USB_CMD_DATA_SIZE);
- GetSamplesFor14443Demod(TRUE, 2000, TRUE);
- cmd_send(CMD_ACK,iLen,0,0,Demod.output,iLen);
- }
- if(!powerfield)
- {
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- LED_D_OFF();
- }
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ if(!powerfield)
+ {
+ // 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);
+ }
+
+ 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);
+ }
+
+ CodeAndTransmit14443bAsReader(data, datalen);
+
+ if(recv)
+ {
+ uint16_t iLen = MIN(Demod.len,USB_CMD_DATA_SIZE);
+ GetSamplesFor14443Demod(TRUE, 2000, TRUE);
+ cmd_send(CMD_ACK,iLen,0,0,Demod.output,iLen);
+ }
+ if(!powerfield)
+ {
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LED_D_OFF();
+ }
}
projects / proxmark3-svn / commitdiff