X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/d5810937bdf7fd5aab2629c58740eecac1ac3b7c..b41be3cb11103739d2fa92ced09d1e29f8151b7b:/armsrc/iso14443b.c diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index 82e5dd6a..f276158f 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -1,5 +1,6 @@ //----------------------------------------------------------------------------- // Jonathan Westhues, split Nov 2006 +// piwi 2018 // // This code is licensed to you under the terms of the GNU GPL, version 2 or, // at your option, any later version. See the LICENSE.txt file for the text of @@ -9,15 +10,18 @@ // the `fake tag' modes. //----------------------------------------------------------------------------- +#include "iso14443b.h" + #include "proxmark3.h" #include "apps.h" #include "util.h" #include "string.h" - #include "iso14443crc.h" +#include "fpgaloader.h" +#include "BigBuf.h" -#define RECEIVE_SAMPLES_TIMEOUT 2000 -#define ISO14443B_DMA_BUFFER_SIZE 256 +#define RECEIVE_SAMPLES_TIMEOUT 64 // TR0 max is 256/fs = 256/(848kHz) = 302us or 64 samples from FPGA +#define ISO14443B_DMA_BUFFER_SIZE 128 // PCB Block number for APDUs static uint8_t pcb_blocknum = 0; @@ -243,7 +247,7 @@ static RAMFUNC int Handle14443bUartBit(uint8_t bit) LED_A_OFF(); // Finished receiving Uart.state = STATE_UNSYNCD; if (Uart.byteCnt != 0) { - return TRUE; + return true; } } else { // this is an error @@ -259,7 +263,7 @@ static RAMFUNC int Handle14443bUartBit(uint8_t bit) break; } - return FALSE; + return false; } @@ -283,7 +287,7 @@ static void UartInit(uint8_t *data) // 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 // spinning, waiting for a well-framed command, until either we get one -// (returns TRUE) or someone presses the pushbutton on the board (FALSE). +// (returns true) or someone presses the pushbutton on the board (false). // // Assume that we're called with the SSC (to the FPGA) and ADC path set // correctly. @@ -302,20 +306,20 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) for(;;) { WDT_HIT(); - if(BUTTON_PRESS()) return FALSE; + 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)) { *len = Uart.byteCnt; - return TRUE; + return true; } } } } - return FALSE; + return false; } //----------------------------------------------------------------------------- @@ -324,6 +328,7 @@ static int GetIso14443bCommandFromReader(uint8_t *received, uint16_t *len) //----------------------------------------------------------------------------- void SimulateIso14443bTag(void) { + LED_A_ON(); // 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: @@ -347,7 +352,7 @@ void SimulateIso14443bTag(void) FpgaDownloadAndGo(FPGA_BITSTREAM_HF); clear_trace(); - set_tracing(TRUE); + set_tracing(true); const uint8_t *resp; uint8_t *respCode; @@ -374,7 +379,7 @@ void SimulateIso14443bTag(void) // We need to listen to the high-frequency, peak-detected path. SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR); cmdsRecvd = 0; @@ -385,10 +390,7 @@ void SimulateIso14443bTag(void) break; } - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(receivedCmd, len, 0, 0, parity, TRUE); - } + LogTrace(receivedCmd, len, 0, 0, NULL, true); // Good, look at the command now. if ( (len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len) == 0) @@ -440,7 +442,7 @@ void SimulateIso14443bTag(void) LED_D_OFF(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_BPSK); AT91C_BASE_SSC->SSC_THR = 0xff; - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_SIMULATOR); // Transmit the response. uint16_t i = 0; @@ -462,12 +464,12 @@ void SimulateIso14443bTag(void) } // trace the response: - if (tracing) { - uint8_t parity[MAX_PARITY_SIZE]; - LogTrace(resp, respLen, 0, 0, parity, FALSE); - } + LogTrace(resp, respLen, 0, 0, NULL, false); } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_A_OFF(); } //============================================================================= @@ -535,54 +537,11 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) #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() { \ - 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); \ - } \ - } \ - } \ - } - +#define AMPLITUDE(ci,cq) (MAX(ABS(ci),ABS(cq)) + (MIN(ABS(ci),ABS(cq))/2)) switch(Demod.state) { case DEMOD_UNSYNCD: - CHECK_FOR_SUBCARRIER(); - if(v > SUBCARRIER_DETECT_THRESHOLD) { // subcarrier detected + if(AMPLITUDE(ci,cq) > SUBCARRIER_DETECT_THRESHOLD) { // subcarrier detected Demod.state = DEMOD_PHASE_REF_TRAINING; Demod.sumI = ci; Demod.sumQ = cq; @@ -592,8 +551,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) case DEMOD_PHASE_REF_TRAINING: if(Demod.posCount < 8) { - CHECK_FOR_SUBCARRIER(); - if (v > SUBCARRIER_DETECT_THRESHOLD) { + if (AMPLITUDE(ci,cq) > 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; @@ -696,7 +654,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) LED_C_OFF(); if(s == 0x000) { // This is EOF (start, stop and all data bits == '0' - return TRUE; + return true; } } } @@ -710,7 +668,7 @@ static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq) break; } - return FALSE; + return false; } @@ -733,14 +691,15 @@ static void DemodInit(uint8_t *data) /* * Demodulate the samples we received from the tag, also log to tracebuffer - * quiet: set to 'TRUE' to disable debug output + * quiet: set to 'true' to disable debug output */ -static void GetSamplesFor14443bDemod(int n, bool quiet) +static void GetSamplesFor14443bDemod(int timeout, bool quiet) { - int max = 0; - bool gotFrame = FALSE; - int lastRxCounter, ci, cq, samples = 0; - + int maxBehindBy = 0; + bool gotFrame = false; + int lastRxCounter, samples = 0; + int8_t ci, cq; + // Allocate memory from BigBuf for some buffers // free all previous allocations first BigBuf_free(); @@ -749,60 +708,65 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) uint8_t *receivedResponse = 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); + uint16_t *dmaBuf = (uint16_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE * sizeof(uint16_t)); // Set up the demodulator for tag -> reader responses. DemodInit(receivedResponse); + // wait for last transfer to complete + while (!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXEMPTY)) + // Setup and start DMA. + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); - int8_t *upTo = dmaBuf; + uint16_t *upTo = dmaBuf; lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; // Signal field is ON with the appropriate LED: LED_D_ON(); // And put the FPGA in the appropriate mode - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_SUBCARRIER_848_KHZ | FPGA_HF_READER_MODE_RECEIVE_IQ); 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) { - ci = upTo[0]; - cq = upTo[1]; - upTo += 2; - 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) { - lastRxCounter += ISO14443B_DMA_BUFFER_SIZE; - } + int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1); + if(behindBy > maxBehindBy) { + maxBehindBy = behindBy; + } - samples += 2; + if(behindBy < 1) continue; - if(Handle14443bSamplesDemod(ci, cq)) { - gotFrame = TRUE; - break; - } + ci = *upTo >> 8; + cq = *upTo; + upTo++; + lastRxCounter--; + if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + upTo = dmaBuf; // start reading the circular buffer from the beginning + lastRxCounter += ISO14443B_DMA_BUFFER_SIZE; + } + 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 = ISO14443B_DMA_BUFFER_SIZE; // DMA Next Counter registers + } + samples++; + + if(Handle14443bSamplesDemod(ci, cq)) { + gotFrame = true; + break; } - if(samples > n || gotFrame) { + if(samples > timeout && Demod.state < DEMOD_PHASE_REF_TRAINING) { + LED_C_OFF(); break; } } - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; + FpgaDisableSscDma(); - if (!quiet) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d", max, samples, gotFrame, Demod.len, Demod.sumI, Demod.sumQ); + if (!quiet) Dbprintf("max behindby = %d, samples = %d, gotFrame = %d, Demod.len = %d, Demod.sumI = %d, Demod.sumQ = %d", maxBehindBy, samples, gotFrame, Demod.len, Demod.sumI, Demod.sumQ); //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, 0, 0, NULL, false); } } @@ -812,48 +776,21 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) //----------------------------------------------------------------------------- static void TransmitFor14443b(void) { - int c; - - FpgaSetupSsc(); - - while(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { - AT91C_BASE_SSC->SSC_THR = 0xff; - } - - // Signal field is ON with the appropriate Red LED - LED_D_ON(); - // Signal we are transmitting with the Green LED + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_SHALLOW_MOD); 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; + for(int c = 0; c < ToSendMax; c++) { + uint8_t data = ToSend[c]; + for (int i = 0; i < 8; i++) { + uint16_t send_word = (data & 0x80) ? 0x0000 : 0xffff; + while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ; + AT91C_BASE_SSC->SSC_THR = send_word; + while (!(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY))) ; + AT91C_BASE_SSC->SSC_THR = send_word; + data <<= 1; } 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 + LED_B_OFF(); } @@ -868,19 +805,14 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) ToSendReset(); - // Establish initial reference level - for(i = 0; i < 40; i++) { - ToSendStuffBit(1); - } // Send SOF for(i = 0; i < 10; i++) { ToSendStuffBit(0); } + ToSendStuffBit(1); + ToSendStuffBit(1); for(i = 0; i < len; i++) { - // Stop bits/EGT - ToSendStuffBit(1); - ToSendStuffBit(1); // Start bit ToSendStuffBit(0); // Data bits @@ -893,19 +825,18 @@ static void CodeIso14443bAsReader(const uint8_t *cmd, int len) } b >>= 1; } + // Stop bit + ToSendStuffBit(1); } + // Send EOF - ToSendStuffBit(1); for(i = 0; i < 10; i++) { ToSendStuffBit(0); } - for(i = 0; i < 8; i++) { - ToSendStuffBit(1); - } + 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++) { + // ensure that last byte is filled up + for(i = 0; i < 8; i++) { ToSendStuffBit(1); } @@ -921,10 +852,7 @@ 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); - } + LogTrace(cmd,len, 0, 0, NULL, true); } /* Sends an APDU to the tag @@ -932,6 +860,7 @@ static void CodeAndTransmit14443bAsReader(const uint8_t *cmd, int len) */ int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *response) { + LED_A_ON(); uint8_t message_frame[message_length + 4]; // PCB message_frame[0] = 0x0A | pcb_blocknum; @@ -945,9 +874,11 @@ int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *respo // send CodeAndTransmit14443bAsReader(message_frame, message_length + 4); // get response - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT*100, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); + FpgaDisableTracing(); if(Demod.len < 3) { + LED_A_OFF(); return 0; } // TODO: Check CRC @@ -956,6 +887,7 @@ int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *respo { memcpy(response, Demod.output, Demod.len); } + LED_A_OFF(); return Demod.len; } @@ -975,7 +907,7 @@ int iso14443b_select_card() // first, wake up the tag CodeAndTransmit14443bAsReader(wupb, sizeof(wupb)); - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); // ATQB too short? if (Demod.len < 14) { @@ -990,7 +922,7 @@ int iso14443b_select_card() 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); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); // Answer to ATTRIB too short? if(Demod.len < 3) { @@ -1005,16 +937,13 @@ int iso14443b_select_card() void iso14443b_setup() { FpgaDownloadAndGo(FPGA_BITSTREAM_HF); // Set up the synchronous serial port - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); // connect Demodulated Signal to ADC: SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Signal field is on with the appropriate LED LED_D_ON(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD); - - // Start the timer - StartCountSspClk(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_SHALLOW_MOD); DemodReset(); UartReset(); @@ -1031,6 +960,7 @@ void iso14443b_setup() { //----------------------------------------------------------------------------- void ReadSTMemoryIso14443b(uint32_t dwLast) { + LED_A_ON(); uint8_t i = 0x00; FpgaDownloadAndGo(FPGA_BITSTREAM_HF); @@ -1041,24 +971,26 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) SpinDelay(200); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); // 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); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_SHALLOW_MOD); SpinDelay(200); clear_trace(); - set_tracing(TRUE); + set_tracing(true); // 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); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); if (Demod.len == 0) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("No response from tag"); + LEDsoff(); return; } else { Dbprintf("Randomly generated Chip ID (+ 2 byte CRC): %02x %02x %02x", @@ -1071,20 +1003,26 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) cmd1[1] = Demod.output[0]; ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]); CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); if (Demod.len != 3) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); Dbprintf("Expected 3 bytes from tag, got %d", Demod.len); + LEDsoff(); 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]) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("CRC Error reading select response."); + LEDsoff(); return; } // Check response from the tag: should be the same UID as the command we just sent: if (cmd1[1] != Demod.output[0]) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); Dbprintf("Bad response to SELECT from Tag, aborting: %02x %02x", cmd1[1], Demod.output[0]); + LEDsoff(); return; } @@ -1093,9 +1031,11 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) cmd1[0] = 0x0B; 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); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); if (Demod.len != 10) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); Dbprintf("Expected 10 bytes from tag, got %d", Demod.len); + LEDsoff(); return; } // The check the CRC of the answer (use cmd1 as temporary variable): @@ -1122,9 +1062,11 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) cmd1[1] = i; ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]); CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1)); - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); if (Demod.len != 6) { // Check if we got an answer from the tag + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("Expected 6 bytes from tag, got less..."); + LEDsoff(); return; } // The check the CRC of the answer (use cmd1 as temporary variable): @@ -1143,6 +1085,9 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) } i++; } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LEDsoff(); } @@ -1165,22 +1110,18 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) */ void RAMFUNC SnoopIso14443b(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; // TODO: set and evaluate trigger condition - + LED_A_ON(); FpgaDownloadAndGo(FPGA_BITSTREAM_HF); BigBuf_free(); clear_trace(); - set_tracing(TRUE); + set_tracing(true); // The DMA buffer, used to stream samples from the FPGA - int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE); + uint16_t *dmaBuf = (uint16_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE * sizeof(uint16_t)); int lastRxCounter; - int8_t *upTo; - int ci, cq; + uint16_t *upTo; + int8_t ci, cq; int maxBehindBy = 0; // Count of samples received so far, so that we can include timing @@ -1197,64 +1138,63 @@ void RAMFUNC SnoopIso14443b(void) 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(); + // Signal field is off + 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); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_SUBCARRIER_848_KHZ | FPGA_HF_READER_MODE_SNOOP_IQ); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Setup for the DMA. - FpgaSetupSsc(); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); upTo = dmaBuf; lastRxCounter = ISO14443B_DMA_BUFFER_SIZE; FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE); - uint8_t parity[MAX_PARITY_SIZE]; - bool TagIsActive = FALSE; - bool ReaderIsActive = FALSE; + bool TagIsActive = false; + bool ReaderIsActive = false; + // 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 + // reader command + bool triggered = false; // And now we loop, receiving samples. for(;;) { - int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & - (ISO14443B_DMA_BUFFER_SIZE-1); + int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (ISO14443B_DMA_BUFFER_SIZE-1); if(behindBy > maxBehindBy) { maxBehindBy = behindBy; } - if(behindBy < 2) continue; + if(behindBy < 1) continue; - ci = upTo[0]; - cq = upTo[1]; - upTo += 2; - lastRxCounter -= 2; - if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { - upTo = dmaBuf; + ci = *upTo>>8; + cq = *upTo; + upTo++; + lastRxCounter--; + if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) { // we have read all of the DMA buffer content. + upTo = dmaBuf; // start reading the circular buffer from the beginning again 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? - Dbprintf("blew circular buffer! behindBy=%d", behindBy); - break; - } - if(!tracing) { - DbpString("Reached trace limit"); + if(behindBy > (9*ISO14443B_DMA_BUFFER_SIZE/10)) { + Dbprintf("About to blow circular buffer - aborted! behindBy=%d", behindBy); break; } + } + 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 = ISO14443B_DMA_BUFFER_SIZE; // DMA Next Counter registers + WDT_HIT(); if(BUTTON_PRESS()) { DbpString("cancelled"); break; } } - samples += 2; + samples++; 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); - } + triggered = true; + LogTrace(Uart.output, Uart.byteCnt, samples, samples, NULL, true); /* And ready to receive another command. */ UartReset(); /* And also reset the demod code, which might have been */ @@ -1262,9 +1202,8 @@ void RAMFUNC SnoopIso14443b(void) DemodReset(); } if(Handle14443bUartBit(cq & 0x01)) { - if(triggered && tracing) { - LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE); - } + triggered = true; + LogTrace(Uart.output, Uart.byteCnt, samples, samples, NULL, true); /* And ready to receive another command. */ UartReset(); /* And also reset the demod code, which might have been */ @@ -1274,17 +1213,10 @@ void RAMFUNC SnoopIso14443b(void) ReaderIsActive = (Uart.state > STATE_GOT_FALLING_EDGE_OF_SOF); } - if(!ReaderIsActive) { // no need to try decoding tag data if the reader is sending - and we cannot afford the time - if(Handle14443bSamplesDemod(ci | 0x01, cq | 0x01)) { - + if(!ReaderIsActive && triggered) { // no need to try decoding tag data if the reader is sending or not yet triggered + if(Handle14443bSamplesDemod(ci/2, cq/2)) { //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; - + LogTrace(Demod.output, Demod.len, samples, samples, NULL, false); // And ready to receive another response. DemodReset(); } @@ -1294,14 +1226,13 @@ void RAMFUNC SnoopIso14443b(void) } FpgaDisableSscDma(); - LEDsoff(); - AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS; 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(" Trace length: %i", BigBuf_get_traceLen()); + LEDsoff(); } @@ -1319,25 +1250,36 @@ void RAMFUNC SnoopIso14443b(void) */ void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, uint8_t data[]) { + LED_A_ON(); FpgaDownloadAndGo(FPGA_BITSTREAM_HF); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); + + // switch field on and give tag some time to power up + LED_D_ON(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER | FPGA_HF_READER_MODE_SEND_SHALLOW_MOD); + FpgaSetupSsc(FPGA_MAJOR_MODE_HF_READER); + SpinDelay(10); if (datalen){ - set_tracing(TRUE); + set_tracing(true); CodeAndTransmit14443bAsReader(data, datalen); if(recv) { - GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE); + GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, true); + FpgaDisableTracing(); uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE); cmd_send(CMD_ACK, iLen, 0, 0, Demod.output, iLen); } + + FpgaDisableTracing(); } if(!powerfield) { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); } + + LED_A_OFF(); }