#define arraylen(x) (sizeof(x)/sizeof((x)[0]))
+static int DEBUG = 0;
+
///////////////////////////////////////////////////////////////////////
// ISO 15693 Part 2 - Air Interface
// This section basicly contains transmission and receiving of bits
#define sprintUID(target,uid) Iso15693sprintUID(target,uid)
// approximate amplitude=sqrt(ci^2+cq^2)
-#define AMPLITUDE(ci, cq) (MAX(ABS(ci), ABS(cq)) + (MIN(ABS(ci), ABS(cq))>>1))
-
-static int DEBUG = 0;
+#define AMPLITUDE(ci, cq) (MAX(ABS(ci), ABS(cq)) + MIN(ABS(ci), ABS(cq))/2)
+// DMA buffer
+#define ISO15693_DMA_BUFFER_SIZE 128
// ---------------------------
// Signal Processing
ToSendStuffBit(0);
ToSendStuffBit(1);
- // And slack at the end, too.
- for(i = 0; i < 24; i++) {
+ // Fill remainder of last byte with 1
+ for(i = 0; i < 4; i++) {
ToSendStuffBit(1);
}
+
+ ToSendMax++;
}
-// encode data using "1 out of 256" sheme
+// encode data using "1 out of 256" scheme
// data rate is 1,66 kbit/s (fc/8192)
// is designed for more robust communication over longer distances
static void CodeIso15693AsReader256(uint8_t *cmd, int n)
}
-// Transmit the command (to the tag) that was placed in ToSend[].
-static void TransmitTo15693Tag(const uint8_t *cmd, int len, int *samples, int *wait)
+// Transmit the command (to the tag) that was placed in cmd[].
+static void TransmitTo15693Tag(const uint8_t *cmd, int len)
{
- int c;
-
FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX);
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
- if(*wait < 10) { *wait = 10; }
- c = 0;
- for(;;) {
+ LED_B_ON();
+ for(int c = 0; c < len; ) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = ~cmd[c];
c++;
- if(c >= len) {
- break;
- }
- }
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
- (void)r;
}
WDT_HIT();
}
- *samples = (c + *wait) << 3;
+ LED_B_OFF();
}
//-----------------------------------------------------------------------------
-// Transmit the command (to the reader) that was placed in ToSend[].
+// Transmit the command (to the reader) that was placed in cmd[].
//-----------------------------------------------------------------------------
-static void TransmitTo15693Reader(const uint8_t *cmd, int len, int *samples, int *wait)
+static void TransmitTo15693Reader(const uint8_t *cmd, int len)
{
- int c = 0;
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR|FPGA_HF_SIMULATOR_MODULATE_424K);
- if(*wait < 10) { *wait = 10; }
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_424K);
- for(;;) {
+ LED_C_ON();
+ for(int c = 0; c < len; ) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = cmd[c];
c++;
- if(c >= len) {
- break;
- }
- }
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
- (void)r;
}
WDT_HIT();
}
- *samples = (c + *wait) << 3;
+ LED_C_OFF();
}
-// Read from Tag
-// Parameters:
-// receivedResponse
-// maxLen
-// samples
-// elapsed
-// returns:
-// number of decoded bytes
-static int GetIso15693AnswerFromTag(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed)
+//=============================================================================
+// An ISO 15693 demodulator (one subcarrier only). Uses cross correlation to
+// identify the SOF, each bit, and EOF.
+// This function is called 8 times per bit (every 2 subcarrier cycles).
+// Subcarrier frequency fs is 424kHz, 1/fs = 2,36us,
+// i.e. function is called every 4,72us
+// LED handling:
+// LED C -> ON once we have received the SOF and are expecting the rest.
+// LED C -> OFF once we have received EOF or are unsynced
+//
+// Returns: true if we received a EOF
+// false if we are still waiting for some more
+//=============================================================================
+
+#define SUBCARRIER_DETECT_THRESHOLD 2
+#define SOF_CORRELATOR_LEN (1<<5)
+
+typedef struct Demod {
+ enum {
+ DEMOD_UNSYNCD,
+ DEMOD_AWAIT_SOF_1,
+ DEMOD_AWAIT_SOF_2,
+ DEMOD_RECEIVING_DATA,
+ DEMOD_AWAIT_EOF
+ } state;
+ int bitCount;
+ int posCount;
+ enum {
+ LOGIC0,
+ LOGIC1,
+ SOF_PART1,
+ SOF_PART2
+ } lastBit;
+ uint16_t shiftReg;
+ uint8_t *output;
+ int len;
+ int sum1, sum2;
+ uint8_t SOF_low;
+ uint8_t SOF_high;
+ uint8_t SOF_last;
+ int32_t SOF_corr;
+ int32_t SOF_corr_prev;
+ uint8_t SOF_correlator[SOF_CORRELATOR_LEN];
+} Demod_t;
+
+static RAMFUNC int Handle15693SamplesDemod(int8_t ci, int8_t cq, Demod_t *Demod)
{
- int c = 0;
- uint8_t *dest = BigBuf_get_addr();
-
-// NOW READ RESPONSE
- FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
- c = 0;
- for(;;) {
- if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
- uint16_t iq = AT91C_BASE_SSC->SSC_RHR;
- // The samples are correlations against I and Q versions of the
- // tone that the tag AM-modulates. We just want power.
- int8_t i = iq >> 8;
- int8_t q = iq;
- uint8_t r = AMPLITUDE(i, q);
-
- dest[c++] = r;
+ switch(Demod->state) {
+ case DEMOD_UNSYNCD:
+ // initialize SOF correlator. We are looking for 12 samples low and 12 samples high.
+ Demod->SOF_low = 0;
+ Demod->SOF_high = 12;
+ Demod->SOF_last = 23;
+ memset(Demod->SOF_correlator, 0x00, Demod->SOF_last + 1);
+ Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq);
+ Demod->SOF_corr = Demod->SOF_correlator[Demod->SOF_last];
+ Demod->SOF_corr_prev = Demod->SOF_corr;
+ // initialize Demodulator
+ Demod->posCount = 0;
+ Demod->bitCount = 0;
+ Demod->len = 0;
+ Demod->state = DEMOD_AWAIT_SOF_1;
+ break;
- if(c >= 4000) {
- break;
+ case DEMOD_AWAIT_SOF_1:
+ // calculate the correlation in real time. Look at differences only.
+ Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_low++];
+ Demod->SOF_corr -= 2*Demod->SOF_correlator[Demod->SOF_high++];
+ Demod->SOF_last++;
+ Demod->SOF_low &= (SOF_CORRELATOR_LEN-1);
+ Demod->SOF_high &= (SOF_CORRELATOR_LEN-1);
+ Demod->SOF_last &= (SOF_CORRELATOR_LEN-1);
+ Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq);
+ Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_last];
+
+ // if correlation increases for 10 consecutive samples, we are close to maximum correlation
+ if (Demod->SOF_corr > Demod->SOF_corr_prev + SUBCARRIER_DETECT_THRESHOLD) {
+ Demod->posCount++;
+ } else {
+ Demod->posCount = 0;
}
- }
- }
- //////////////////////////////////////////
- /////////// DEMODULATE ///////////////////
- //////////////////////////////////////////
+ if (Demod->posCount == 10) { // correlation increased 10 times
+ Demod->state = DEMOD_AWAIT_SOF_2;
+ }
+
+ Demod->SOF_corr_prev = Demod->SOF_corr;
+
+ break;
+
+ case DEMOD_AWAIT_SOF_2:
+ // calculate the correlation in real time. Look at differences only.
+ Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_low++];
+ Demod->SOF_corr -= 2*Demod->SOF_correlator[Demod->SOF_high++];
+ Demod->SOF_last++;
+ Demod->SOF_low &= (SOF_CORRELATOR_LEN-1);
+ Demod->SOF_high &= (SOF_CORRELATOR_LEN-1);
+ Demod->SOF_last &= (SOF_CORRELATOR_LEN-1);
+ Demod->SOF_correlator[Demod->SOF_last] = AMPLITUDE(ci,cq);
+ Demod->SOF_corr += Demod->SOF_correlator[Demod->SOF_last];
+
+ if (Demod->SOF_corr >= Demod->SOF_corr_prev) { // we are looking for the maximum correlation
+ Demod->SOF_corr_prev = Demod->SOF_corr;
+ } else {
+ Demod->lastBit = SOF_PART1; // detected 1st part of SOF
+ Demod->sum1 = Demod->SOF_correlator[Demod->SOF_last];
+ Demod->sum2 = 0;
+ Demod->posCount = 2;
+ Demod->state = DEMOD_RECEIVING_DATA;
+ LED_C_ON();
+ }
+
+ break;
- int i, j;
- int max = 0, maxPos=0;
+ case DEMOD_RECEIVING_DATA:
+ if (Demod->posCount == 1) {
+ Demod->sum1 = 0;
+ Demod->sum2 = 0;
+ }
- int skip = 2;
+ if (Demod->posCount <= 4) {
+ Demod->sum1 += AMPLITUDE(ci, cq);
+ } else {
+ Demod->sum2 += AMPLITUDE(ci, cq);
+ }
- // First, correlate for SOF
- for(i = 0; i < 200; i++) { // usually, SOF is found around i = 60
- int corr = 0;
- for(j = 0; j < arraylen(FrameSOF); j += skip) {
- corr += FrameSOF[j]*dest[i+(j/skip)];
- }
- if(corr > max) {
- max = corr;
- maxPos = i;
- }
+ if (Demod->posCount == 8) {
+ int16_t corr_1 = (Demod->sum2 - Demod->sum1) / 4;
+ int16_t corr_0 = (Demod->sum1 - Demod->sum2) / 4;
+ int16_t corr_EOF = (Demod->sum1 + Demod->sum2) / 8;
+ if (corr_EOF > corr_0 && corr_EOF > corr_1) {
+ Demod->state = DEMOD_AWAIT_EOF;
+ } else if (corr_1 > corr_0) {
+ // logic 1
+ if (Demod->lastBit == SOF_PART1) { // still part of SOF
+ Demod->lastBit = SOF_PART2;
+ } else {
+ Demod->lastBit = LOGIC1;
+ Demod->shiftReg >>= 1;
+ Demod->shiftReg |= 0x80;
+ Demod->bitCount++;
+ if (Demod->bitCount == 8) {
+ Demod->output[Demod->len] = Demod->shiftReg;
+ Demod->len++;
+ Demod->bitCount = 0;
+ Demod->shiftReg = 0;
+ }
+ }
+ } else {
+ // logic 0
+ if (Demod->lastBit == SOF_PART1) { // incomplete SOF
+ Demod->state = DEMOD_UNSYNCD;
+ LED_C_OFF();
+ } else {
+ Demod->lastBit = LOGIC0;
+ Demod->shiftReg >>= 1;
+ Demod->bitCount++;
+ if (Demod->bitCount == 8) {
+ Demod->output[Demod->len] = Demod->shiftReg;
+ Demod->len++;
+ Demod->bitCount = 0;
+ Demod->shiftReg = 0;
+ }
+ }
+ }
+ Demod->posCount = 0;
+ }
+ Demod->posCount++;
+ break;
+
+ case DEMOD_AWAIT_EOF:
+ if (Demod->lastBit == LOGIC0) { // this was already part of EOF
+ LED_C_OFF();
+ return true;
+ } else {
+ Demod->state = DEMOD_UNSYNCD;
+ LED_C_OFF();
+ }
+ break;
+
+ default:
+ Demod->state = DEMOD_UNSYNCD;
+ LED_C_OFF();
+ break;
}
- if (DEBUG) Dbprintf("SOF at %d, correlation %d", maxPos, max/(arraylen(FrameSOF)/skip));
- int k = 0; // this will be our return value
+ return false;
+}
- // greg - If correlation is less than 1 then there's little point in continuing
- if ((max/(arraylen(FrameSOF)/skip)) >= 1)
- {
- i = maxPos + arraylen(FrameSOF)/skip;
+static void DemodInit(Demod_t* Demod, uint8_t* data)
+{
+ Demod->output = data;
+ Demod->state = DEMOD_UNSYNCD;
+}
+
+
+/*
+ * Demodulate the samples we received from the tag, also log to tracebuffer
+ */
+static int GetIso15693AnswerFromTag(uint8_t* response, int timeout)
+{
+ int maxBehindBy = 0;
+ int lastRxCounter, samples = 0;
+ int8_t ci, cq;
+ bool gotFrame = false;
- uint8_t outBuf[20];
- memset(outBuf, 0, sizeof(outBuf));
- uint8_t mask = 0x01;
- for(;;) {
- int corr0 = 0, corr00 = 0, corr01 = 0, corr1 = 0, corrEOF = 0;
- for(j = 0; j < arraylen(Logic0); j += skip) {
- corr0 += Logic0[j]*dest[i+(j/skip)];
- }
- corr01 = corr00 = corr0;
- for(j = 0; j < arraylen(Logic0); j += skip) {
- corr00 += Logic0[j]*dest[i+arraylen(Logic0)/skip+(j/skip)];
- corr01 += Logic1[j]*dest[i+arraylen(Logic0)/skip+(j/skip)];
- }
- for(j = 0; j < arraylen(Logic1); j += skip) {
- corr1 += Logic1[j]*dest[i+(j/skip)];
- }
- for(j = 0; j < arraylen(FrameEOF); j += skip) {
- corrEOF += FrameEOF[j]*dest[i+(j/skip)];
- }
- // Even things out by the length of the target waveform.
- corr00 *= 2;
- corr01 *= 2;
- corr0 *= 4;
- corr1 *= 4;
+ // Allocate memory from BigBuf for some buffers
+ // free all previous allocations first
+ BigBuf_free();
+
+ // The DMA buffer, used to stream samples from the FPGA
+ uint16_t* dmaBuf = (uint16_t*) BigBuf_malloc(ISO15693_DMA_BUFFER_SIZE * sizeof(uint16_t));
+
+ // the Demodulatur data structure
+ Demod_t* Demod = (Demod_t*) BigBuf_malloc(sizeof(Demod_t));
- if(corrEOF > corr1 && corrEOF > corr00 && corrEOF > corr01) {
- if (DEBUG) Dbprintf("EOF at %d, correlation %d (corr01: %d, corr00: %d, corr1: %d, corr0: %d)",
- i, corrEOF, corr01, corr00, corr1, corr0);
- break;
- } else if(corr1 > corr0) {
- i += arraylen(Logic1)/skip;
- outBuf[k] |= mask;
- } else {
- i += arraylen(Logic0)/skip;
- }
- mask <<= 1;
- if(mask == 0) {
- k++;
- mask = 0x01;
- }
- if((i+(int)arraylen(FrameEOF)/skip) >= 4000) {
- DbpString("ran off end!");
- break;
- }
+ // Set up the demodulator for tag -> reader responses.
+ DemodInit(Demod, response);
+
+ // wait for last transfer to complete
+ while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY));
+
+ // And put the FPGA in the appropriate mode
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+
+ // Setup and start DMA.
+ FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+ FpgaSetupSscDma((uint8_t*) dmaBuf, ISO15693_DMA_BUFFER_SIZE);
+
+ uint16_t *upTo = dmaBuf;
+ lastRxCounter = ISO15693_DMA_BUFFER_SIZE;
+
+ for(;;) {
+ int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO15693_DMA_BUFFER_SIZE-1);
+ if(behindBy > maxBehindBy) {
+ maxBehindBy = behindBy;
}
- if(mask != 0x01) { // this happens, when we miss the EOF
- // TODO: for some reason this happens quite often
- if (DEBUG) Dbprintf("error, uneven octet! (extra bits!) mask=%02x", mask);
- if (mask<0x08) k--; // discard the last uneven octet;
- // 0x08 is an assumption - but works quite often
+
+ if (behindBy < 1) continue;
+
+ ci = (int8_t)(*upTo >> 8);
+ cq = (int8_t)(*upTo & 0xff);
+
+ upTo++;
+ lastRxCounter--;
+ if(upTo >= dmaBuf + ISO15693_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content.
+ upTo = dmaBuf; // start reading the circular buffer from the beginning
+ lastRxCounter += ISO15693_DMA_BUFFER_SIZE;
}
- // uint8_t str1 [8];
- // itoa(k,str1);
- // strncat(str1," octets read",8);
-
- // DbpString( str1); // DbpString("%d octets", k);
-
- // for(i = 0; i < k; i+=3) {
- // //DbpString("# %2d: %02x ", i, outBuf[i]);
- // DbpIntegers(outBuf[i],outBuf[i+1],outBuf[i+2]);
- // }
-
- for(i = 0; i < k; i++) {
- receivedResponse[i] = outBuf[i];
+ if (AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_ENDRX)) { // DMA Counter Register had reached 0, already rotated.
+ AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf; // refresh the DMA Next Buffer and
+ AT91C_BASE_PDC_SSC->PDC_RNCR = ISO15693_DMA_BUFFER_SIZE; // DMA Next Counter registers
}
- } // "end if correlation > 0" (max/(arraylen(FrameSOF)/skip))
- return k; // return the number of bytes demodulated
+ samples++;
-/// DbpString("CRC=%04x", Iso15693Crc(outBuf, k-2));
+ if (Handle15693SamplesDemod(ci, cq, Demod)) {
+ gotFrame = true;
+ break;
+ }
+ if(samples > timeout && Demod->state < DEMOD_RECEIVING_DATA) {
+ Demod->len = 0;
+ break;
+ }
+ }
+
+ FpgaDisableSscDma();
+
+ if (DEBUG) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.state = %d, Demod.len = %d, Demod.bitCount = %d, Demod.posCount = %d",
+ maxBehindBy, samples, gotFrame, Demod->state, Demod->len, Demod->bitCount, Demod->posCount);
+
+ if (tracing && Demod->len > 0) {
+ uint8_t parity[MAX_PARITY_SIZE];
+ LogTrace(Demod->output, Demod->len, 0, 0, parity, false);
+ }
+
+ return Demod->len;
}
// Now the GetISO15693 message from sniffing command
+// TODO: fix it. This cannot work for several reasons:
+// 1. Carrier is switched on during sniffing?
+// 2. We most probable miss the next reader command when demodulating
static int GetIso15693AnswerFromSniff(uint8_t *receivedResponse, int maxLen, int *samples, int *elapsed)
{
- int c = 0;
uint8_t *dest = BigBuf_get_addr();
// NOW READ RESPONSE
+ LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
//spindelay(60); // greg - experiment to get rid of some of the 0 byte/failed reads
- c = 0;
- for(;;) {
+ for(int c = 0; c < BIGBUF_SIZE; ) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
uint16_t iq = AT91C_BASE_SSC->SSC_RHR;
// The samples are correlations against I and Q versions of the
// tone that the tag AM-modulates. We just want power,
// so abs(I) + abs(Q) is close to what we want.
- int8_t i = iq >> 8;
- int8_t q = iq;
+ int8_t i = (int8_t)(iq >> 8);
+ int8_t q = (int8_t)(iq & 0xff);
uint8_t r = AMPLITUDE(i, q);
-
dest[c++] = r;
-
- if(c >= BIGBUF_SIZE) {
- break;
- }
}
}
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LED_D_OFF();
//////////////////////////////////////////
/////////// DEMODULATE ///////////////////
maxPos = i;
}
}
+
if (DEBUG) Dbprintf("SOF at %d, correlation %d", maxPos,max/(arraylen(FrameSOF)/skip));
int k = 0; // this will be our return value
if(corrEOF > corr1 && corrEOF > corr00 && corrEOF > corr01) {
if (DEBUG) Dbprintf("EOF at %d, correlation %d (corr01: %d, corr00: %d, corr1: %d, corr0: %d)",
- i, corrEOF, corr01, corr00, corr1, corr0);
+ i, corrEOF, corr01, corr00, corr1, corr0);
break;
} else if(corr1 > corr0) {
i += arraylen(Logic1)/skip;
//-----------------------------------------------------------------------------
void AcquireRawAdcSamplesIso15693(void)
{
+ LEDsoff();
+ LED_A_ON();
+
uint8_t *dest = BigBuf_get_addr();
- int c = 0;
-
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
BuildIdentifyRequest();
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
// Give the tags time to energize
+ LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
SpinDelay(100);
FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_TX);
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX);
- c = 0;
- for(;;) {
+ LED_B_ON();
+ for(int c = 0; c < ToSendMax; ) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = ~ToSend[c];
c++;
- if(c == ToSendMax+3) {
- break;
- }
}
WDT_HIT();
}
+ LED_B_OFF();
+
+ // wait for last transfer to complete
+ while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY));
FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
- c = 0;
- for(;;) {
+ for(int c = 0; c < 4000; ) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
uint16_t iq = AT91C_BASE_SSC->SSC_RHR;
// The samples are correlations against I and Q versions of the
// tone that the tag AM-modulates. We just want power,
// so abs(I) + abs(Q) is close to what we want.
- int8_t i = iq >> 8;
- int8_t q = iq;
+ int8_t i = (int8_t)(iq >> 8);
+ int8_t q = (int8_t)(iq & 0xff);
uint8_t r = AMPLITUDE(i, q);
-
dest[c++] = r;
-
- if(c >= 4000) {
- break;
- }
}
}
+
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LEDsoff();
}
+// TODO: there is no trigger condition. The 14000 samples represent a time frame of 66ms.
+// It is unlikely that we get something meaningful.
+// TODO: Currently we only record tag answers. Add tracing of reader commands.
+// TODO: would we get something at all? The carrier is switched on...
void RecordRawAdcSamplesIso15693(void)
{
+ LEDsoff();
+ LED_A_ON();
+
uint8_t *dest = BigBuf_get_addr();
- int c = 0;
-
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
// Setup SSC
FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
SpinDelay(100);
+ LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
- c = 0;
- for(;;) {
+ for(int c = 0; c < 14000;) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
uint16_t iq = AT91C_BASE_SSC->SSC_RHR;
// The samples are correlations against I and Q versions of the
// tone that the tag AM-modulates. We just want power,
// so abs(I) + abs(Q) is close to what we want.
- int8_t i = iq >> 8;
- int8_t q = iq;
+ int8_t i = (int8_t)(iq >> 8);
+ int8_t q = (int8_t)(iq & 0xff);
uint8_t r = AMPLITUDE(i, q);
-
dest[c++] = r;
-
- if(c >= 14000) {
- break;
- }
}
}
+
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LED_D_OFF();
Dbprintf("finished recording");
+ LED_A_OFF();
}
// Initialize the proxmark as iso15k reader
// (this might produces glitches that confuse some tags
-void Iso15693InitReader() {
- LED_A_ON();
- LED_B_ON();
- LED_C_OFF();
- LED_D_OFF();
-
+static void Iso15693InitReader() {
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
// Setup SSC
// FpgaSetupSsc();
// Start from off (no field generated)
+ LED_D_OFF();
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
SpinDelay(10);
FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
// Give the tags time to energize
+ LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
SpinDelay(250);
-
- LED_A_ON();
- LED_B_OFF();
- LED_C_OFF();
- LED_D_OFF();
}
///////////////////////////////////////////////////////////////////////
// ISO 15693 Part 3 - Air Interface
-// This section basicly contains transmission and receiving of bits
+// This section basically contains transmission and receiving of bits
///////////////////////////////////////////////////////////////////////
// Encode (into the ToSend buffers) an identify request, which is the first
CodeIso15693AsReader(cmd, sizeof(cmd));
}
+
// Now the VICC>VCD responses when we are simulating a tag
- static void BuildInventoryResponse( uint8_t *uid)
+static void BuildInventoryResponse( uint8_t *uid)
{
uint8_t cmd[12];
// **recv will return you a pointer to the received data
// If you do not need the answer use NULL for *recv[]
// return: lenght of received data
-int SendDataTag(uint8_t *send, int sendlen, int init, int speed, uint8_t **recv) {
+int SendDataTag(uint8_t *send, int sendlen, bool init, int speed, uint8_t **recv) {
- int samples = 0;
- int tsamples = 0;
- int wait = 0;
- int elapsed = 0;
-
LED_A_ON();
- LED_B_ON();
+ LED_B_OFF();
LED_C_OFF();
- LED_D_OFF();
if (init) Iso15693InitReader();
CodeIso15693AsReader(send, sendlen);
}
- LED_A_ON();
- LED_B_OFF();
-
- TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);
+ TransmitTo15693Tag(ToSend,ToSendMax);
// Now wait for a response
if (recv!=NULL) {
- LED_A_OFF();
- LED_B_ON();
- answerLen = GetIso15693AnswerFromTag(answer, 100, &samples, &elapsed) ;
+ answerLen = GetIso15693AnswerFromTag(answer, 100);
*recv=answer;
}
LED_A_OFF();
- LED_B_OFF();
- LED_C_OFF();
- LED_D_OFF();
return answerLen;
}
return;
}
-
-
//-----------------------------------------------------------------------------
// Simulate an ISO15693 reader, perform anti-collision and then attempt to read a sector
// all demodulation performed in arm rather than host. - greg
//-----------------------------------------------------------------------------
void ReaderIso15693(uint32_t parameter)
{
+ LEDsoff();
LED_A_ON();
- LED_B_ON();
- LED_C_OFF();
- LED_D_OFF();
int answerLen1 = 0;
- int answerLen2 = 0;
- // int answerLen3 = 0;
- int i = 0;
- int samples = 0;
- int tsamples = 0;
- int wait = 0;
- int elapsed = 0;
uint8_t TagUID[8] = {0x00};
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
uint8_t *answer1 = BigBuf_get_addr() + 4000;
- uint8_t *answer2 = BigBuf_get_addr() + 4100;
- // uint8_t *answer3 = BigBuf_get_addr() + 4200;
- // Blank arrays
memset(answer1, 0x00, 200);
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
SpinDelay(200);
// Give the tags time to energize
+ LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
SpinDelay(200);
- LED_A_ON();
- LED_B_OFF();
- LED_C_OFF();
- LED_D_OFF();
-
// FIRST WE RUN AN INVENTORY TO GET THE TAG UID
// THIS MEANS WE CAN PRE-BUILD REQUESTS TO SAVE CPU TIME
// Now send the IDENTIFY command
BuildIdentifyRequest();
- TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);
+ TransmitTo15693Tag(ToSend,ToSendMax);
// Now wait for a response
- answerLen1 = GetIso15693AnswerFromTag(answer1, 100, &samples, &elapsed) ;
+ answerLen1 = GetIso15693AnswerFromTag(answer1, 100) ;
if (answerLen1 >=12) // we should do a better check than this
{
Dbhexdump(answerLen1,answer1,true);
// UID is reverse
- if (answerLen1>=12)
+ if (answerLen1 >= 12)
Dbprintf("UID = %02hX%02hX%02hX%02hX%02hX%02hX%02hX%02hX",
TagUID[7],TagUID[6],TagUID[5],TagUID[4],
TagUID[3],TagUID[2],TagUID[1],TagUID[0]);
// Dbhexdump(answerLen3,answer3,true);
// read all pages
- if (answerLen1>=12 && DEBUG) {
- i=0;
+ if (answerLen1 >= 12 && DEBUG) {
+ uint8_t *answer2 = BigBuf_get_addr() + 4100;
+ int i=0;
while (i<32) { // sanity check, assume max 32 pages
BuildReadBlockRequest(TagUID,i);
- TransmitTo15693Tag(ToSend,ToSendMax,&tsamples, &wait);
- answerLen2 = GetIso15693AnswerFromTag(answer2, 100, &samples, &elapsed);
+ TransmitTo15693Tag(ToSend,ToSendMax);
+ int answerLen2 = GetIso15693AnswerFromTag(answer2, 100);
if (answerLen2>0) {
Dbprintf("READ SINGLE BLOCK %d returned %d octets:",i,answerLen2);
DbdecodeIso15693Answer(answerLen2,answer2);
}
}
- LED_A_OFF();
- LED_B_OFF();
- LED_C_OFF();
+ // for the time being, switch field off to protect rdv4.0
+ // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LED_D_OFF();
+
+ LED_A_OFF();
}
// Simulate an ISO15693 TAG, perform anti-collision and then print any reader commands
// all demodulation performed in arm rather than host. - greg
void SimTagIso15693(uint32_t parameter, uint8_t *uid)
{
+ LEDsoff();
LED_A_ON();
- LED_B_ON();
- LED_C_OFF();
- LED_D_OFF();
int answerLen1 = 0;
int samples = 0;
- int tsamples = 0;
- int wait = 0;
int elapsed = 0;
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
SpinDelay(200);
- LED_A_OFF();
- LED_B_OFF();
- LED_C_ON();
- LED_D_OFF();
-
// Listen to reader
answerLen1 = GetIso15693AnswerFromSniff(buf, 100, &samples, &elapsed) ;
BuildInventoryResponse(uid);
- TransmitTo15693Reader(ToSend,ToSendMax, &tsamples, &wait);
+ TransmitTo15693Reader(ToSend,ToSendMax);
}
Dbprintf("%d octets read from reader command: %x %x %x %x %x %x %x %x %x", answerLen1,
uid[0], uid[1], uid[2], uid[3],
uid[4], uid[5], uid[6], uid[7]);
- LED_A_OFF();
- LED_B_OFF();
- LED_C_OFF();
- LED_D_OFF();
+ LEDsoff();
}
// (some manufactures offer a way to read the AFI, though)
void BruteforceIso15693Afi(uint32_t speed)
{
+ LEDsoff();
+ LED_A_ON();
+
uint8_t data[20];
uint8_t *recv=data;
int datalen=0, recvlen=0;
data[1]=ISO15_CMD_INVENTORY;
data[2]=0; // mask length
datalen=AddCrc(data,3);
- recvlen=SendDataTag(data,datalen,0,speed,&recv);
+ recvlen=SendDataTag(data, datalen, false, speed, &recv);
WDT_HIT();
if (recvlen>=12) {
Dbprintf("NoAFI UID=%s",sprintUID(NULL,&recv[2]));
for (int i=0;i<256;i++) {
data[2]=i & 0xFF;
datalen=AddCrc(data,4);
- recvlen=SendDataTag(data,datalen,0,speed,&recv);
+ recvlen=SendDataTag(data, datalen, false, speed, &recv);
WDT_HIT();
if (recvlen>=12) {
Dbprintf("AFI=%i UID=%s",i,sprintUID(NULL,&recv[2]));
}
Dbprintf("AFI Bruteforcing done.");
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LEDsoff();
}
// Allows to directly send commands to the tag via the client
-void DirectTag15693Command(uint32_t datalen,uint32_t speed, uint32_t recv, uint8_t data[]) {
+void DirectTag15693Command(uint32_t datalen, uint32_t speed, uint32_t recv, uint8_t data[]) {
int recvlen=0;
uint8_t *recvbuf = BigBuf_get_addr();
-// UsbCommand n;
+
+ LED_A_ON();
if (DEBUG) {
Dbprintf("SEND");
Dbhexdump(datalen,data,true);
}
- recvlen=SendDataTag(data,datalen,1,speed,(recv?&recvbuf:NULL));
+ recvlen = SendDataTag(data, datalen, true, speed, (recv?&recvbuf:NULL));
if (recv) {
- LED_B_ON();
- cmd_send(CMD_ACK,recvlen>48?48:recvlen,0,0,recvbuf,48);
- LED_B_OFF();
+ cmd_send(CMD_ACK, recvlen>48?48:recvlen, 0, 0, recvbuf, 48);
if (DEBUG) {
Dbprintf("RECV");
}
}
+ // for the time being, switch field off to protect rdv4.0
+ // note: this prevents using hf 15 cmd with s option - which isn't implemented yet anyway
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LED_D_OFF();
+
+ LED_A_OFF();
}
projects / proxmark3-svn / commitdiff