#include "iso14443crc.h"
#define RECEIVE_SAMPLES_TIMEOUT 2000
+#define ISO14443B_DMA_BUFFER_SIZE 256
+
+// PCB Block number for APDUs
+static uint8_t pcb_blocknum = 0;
//=============================================================================
// An ISO 14443 Type B tag. We listen for commands from the reader, using
}
}
}
-
+
return FALSE;
}
0x00, 0x21, 0x85, 0x5e, 0xd7
};
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+
clear_trace();
set_tracing(TRUE);
uint16_t len;
uint16_t cmdsRecvd = 0;
- FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
-
// prepare the (only one) tag answer:
CodeIso14443bAsTag(response1, sizeof(response1));
uint8_t *resp1Code = BigBuf_malloc(ToSendMax);
- memcpy(resp1Code, ToSend, ToSendMax);
+ memcpy(resp1Code, ToSend, ToSendMax);
uint16_t resp1CodeLen = ToSendMax;
// We need to listen to the high-frequency, peak-detected path.
// Good, look at the command now.
if ( (len == sizeof(cmd1) && memcmp(receivedCmd, cmd1, len) == 0)
|| (len == sizeof(cmd2) && memcmp(receivedCmd, cmd2, len) == 0) ) {
- resp = response1;
+ resp = response1;
respLen = sizeof(response1);
- respCode = resp1Code;
+ respCode = resp1Code;
respCodeLen = resp1CodeLen;
} else {
Dbprintf("new cmd from reader: len=%d, cmdsRecvd=%d", len, cmdsRecvd);
(void)b;
}
}
-
+
// trace the response:
if (tracing) {
uint8_t parity[MAX_PARITY_SIZE];
LogTrace(resp, respLen, 0, 0, parity, FALSE);
}
-
+
}
}
} 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() { \
} \
} \
}
-
+
switch(Demod.state) {
case DEMOD_UNSYNCD:
CHECK_FOR_SUBCARRIER();
Demod.metric -= Demod.thisBit;
}
(Demod.metricN)++;
-*/
+*/
Demod.shiftReg >>= 1;
if(Demod.thisBit > 0) { // logic '1'
// Allocate memory from BigBuf for some buffers
// free all previous allocations first
BigBuf_free();
-
+
// The response (tag -> reader) that we're receiving.
uint8_t *receivedResponse = BigBuf_malloc(MAX_FRAME_SIZE);
-
+
// The DMA buffer, used to stream samples from the FPGA
- int8_t *dmaBuf = (int8_t*) BigBuf_malloc(DMA_BUFFER_SIZE);
+ int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE);
// Set up the demodulator for tag -> reader responses.
DemodInit(receivedResponse);
// Setup and start DMA.
- FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE);
+ FpgaSetupSscDma((uint8_t*) dmaBuf, ISO14443B_DMA_BUFFER_SIZE);
int8_t *upTo = dmaBuf;
- lastRxCounter = DMA_BUFFER_SIZE;
+ lastRxCounter = ISO14443B_DMA_BUFFER_SIZE;
// Signal field is ON with the appropriate LED:
LED_D_ON();
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) {
+ 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 + DMA_BUFFER_SIZE) {
+ if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
upTo = dmaBuf;
AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
- AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
+ AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE;
}
lastRxCounter -= 2;
if(lastRxCounter <= 0) {
- lastRxCounter += DMA_BUFFER_SIZE;
+ lastRxCounter += ISO14443B_DMA_BUFFER_SIZE;
}
samples += 2;
//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);
}
}
TransmitFor14443b();
if (tracing) {
uint8_t parity[MAX_PARITY_SIZE];
- GetParity(cmd, len, parity);
LogTrace(cmd,len, 0, 0, parity, TRUE);
}
}
+/* Sends an APDU to the tag
+ * TODO: check CRC and preamble
+ */
+int iso14443b_apdu(uint8_t const *message, size_t message_length, uint8_t *response)
+{
+ uint8_t message_frame[message_length + 4];
+ // PCB
+ message_frame[0] = 0x0A | pcb_blocknum;
+ pcb_blocknum ^= 1;
+ // CID
+ message_frame[1] = 0;
+ // INF
+ memcpy(message_frame + 2, message, message_length);
+ // EDC (CRC)
+ ComputeCrc14443(CRC_14443_B, message_frame, message_length + 2, &message_frame[message_length + 2], &message_frame[message_length + 3]);
+ // send
+ CodeAndTransmit14443bAsReader(message_frame, message_length + 4);
+ // get response
+ GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT*100, TRUE);
+ if(Demod.len < 3)
+ {
+ return 0;
+ }
+ // TODO: Check CRC
+ // copy response contents
+ if(response != NULL)
+ {
+ memcpy(response, Demod.output, Demod.len);
+ }
+ return Demod.len;
+}
+
+/* Perform the ISO 14443 B Card Selection procedure
+ * Currently does NOT do any collision handling.
+ * It expects 0-1 cards in the device's range.
+ * TODO: Support multiple cards (perform anticollision)
+ * TODO: Verify CRC checksums
+ */
+int iso14443b_select_card()
+{
+ // WUPB command (including CRC)
+ // Note: WUPB wakes up all tags, REQB doesn't wake up tags in HALT state
+ static const uint8_t wupb[] = { 0x05, 0x00, 0x08, 0x39, 0x73 };
+ // ATTRIB command (with space for CRC)
+ uint8_t attrib[] = { 0x1D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00};
+
+ // first, wake up the tag
+ CodeAndTransmit14443bAsReader(wupb, sizeof(wupb));
+ GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+ // ATQB too short?
+ if (Demod.len < 14)
+ {
+ return 2;
+ }
+
+ // select the tag
+ // copy the PUPI to ATTRIB
+ memcpy(attrib + 1, Demod.output + 1, 4);
+ /* copy the protocol info from ATQB (Protocol Info -> Protocol_Type) into
+ ATTRIB (Param 3) */
+ attrib[7] = Demod.output[10] & 0x0F;
+ ComputeCrc14443(CRC_14443_B, attrib, 9, attrib + 9, attrib + 10);
+ CodeAndTransmit14443bAsReader(attrib, sizeof(attrib));
+ GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
+ // Answer to ATTRIB too short?
+ if(Demod.len < 3)
+ {
+ return 2;
+ }
+ // reset PCB block number
+ pcb_blocknum = 0;
+ return 1;
+}
+
+// Set up ISO 14443 Type B communication (similar to iso14443a_setup)
+void iso14443b_setup() {
+ FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+ // Set up the synchronous serial port
+ FpgaSetupSsc();
+ // 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();
+
+ DemodReset();
+ UartReset();
+}
//-----------------------------------------------------------------------------
// Read a SRI512 ISO 14443B tag.
//-----------------------------------------------------------------------------
void ReadSTMemoryIso14443b(uint32_t dwLast)
{
- clear_trace();
- set_tracing(TRUE);
-
uint8_t i = 0x00;
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
// 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_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
SpinDelay(200);
+ clear_trace();
+ set_tracing(TRUE);
+
// First command: wake up the tag using the INITIATE command
uint8_t cmd1[] = {0x06, 0x00, 0x97, 0x5b};
-
CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
-// LED_A_ON();
GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
-// LED_A_OFF();
if (Demod.len == 0) {
- DbpString("No response from tag");
- return;
+ DbpString("No response from tag");
+ return;
} else {
- Dbprintf("Randomly generated UID from tag (+ 2 byte CRC): %02x %02x %02x",
- Demod.output[0], Demod.output[1], Demod.output[2]);
+ Dbprintf("Randomly generated Chip ID (+ 2 byte CRC): %02x %02x %02x",
+ Demod.output[0], Demod.output[1], Demod.output[2]);
}
+
// There is a response, SELECT the uid
DbpString("Now SELECT tag:");
cmd1[0] = 0x0E; // 0x0E is SELECT
cmd1[1] = Demod.output[0];
ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]);
CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
-
-// LED_A_ON();
GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
-// LED_A_OFF();
if (Demod.len != 3) {
Dbprintf("Expected 3 bytes from tag, got %d", Demod.len);
return;
Dbprintf("Bad response to SELECT from Tag, aborting: %02x %02x", 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]);
CodeAndTransmit14443bAsReader(cmd1, 3); // Only first three bytes for this one
-
-// LED_A_ON();
GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
-// LED_A_OFF();
if (Demod.len != 10) {
Dbprintf("Expected 10 bytes from tag, got %d", Demod.len);
return;
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! Expected: %04x got: %04x",
- (cmd1[2]<<8)+cmd1[3], (Demod.output[8]<<8)+Demod.output[9]);
+ (cmd1[2]<<8)+cmd1[3], (Demod.output[8]<<8)+Demod.output[9]);
// Do not return;, let's go on... (we should retry, maybe ?)
}
Dbprintf("Tag UID (64 bits): %08x %08x",
- (Demod.output[7]<<24) + (Demod.output[6]<<16) + (Demod.output[5]<<8) + Demod.output[4],
- (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0]);
+ (Demod.output[7]<<24) + (Demod.output[6]<<16) + (Demod.output[5]<<8) + Demod.output[4],
+ (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0]);
// Now loop to read all 16 blocks, address from 0 to last block
Dbprintf("Tag memory dump, block 0 to %d", dwLast);
cmd1[1] = i;
ComputeCrc14443(CRC_14443_B, cmd1, 2, &cmd1[2], &cmd1[3]);
CodeAndTransmit14443bAsReader(cmd1, sizeof(cmd1));
-
-// LED_A_ON();
GetSamplesFor14443bDemod(RECEIVE_SAMPLES_TIMEOUT, TRUE);
-// LED_A_OFF();
if (Demod.len != 6) { // Check if we got an answer from the tag
DbpString("Expected 6 bytes from tag, got less...");
return;
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! Expected: %04x got: %04x",
- (cmd1[2]<<8)+cmd1[3], (Demod.output[4]<<8)+Demod.output[5]);
+ (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=%02x, Contents=%08x, CRC=%04x", i,
- (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0],
- (Demod.output[4]<<8)+Demod.output[5]);
+ (Demod.output[3]<<24) + (Demod.output[2]<<16) + (Demod.output[1]<<8) + Demod.output[0],
+ (Demod.output[4]<<8)+Demod.output[5]);
if (i == 0xff) {
break;
}
* Memory usage for this function, (within BigBuf)
* Last Received command (reader->tag) - MAX_FRAME_SIZE
* Last Received command (tag->reader) - MAX_FRAME_SIZE
- * DMA Buffer - DMA_BUFFER_SIZE
+ * DMA Buffer - ISO14443B_DMA_BUFFER_SIZE
* Demodulated samples received - all the rest
*/
void RAMFUNC SnoopIso14443b(void)
set_tracing(TRUE);
// The DMA buffer, used to stream samples from the FPGA
- int8_t *dmaBuf = (int8_t*) BigBuf_malloc(DMA_BUFFER_SIZE);
+ int8_t *dmaBuf = (int8_t*) BigBuf_malloc(ISO14443B_DMA_BUFFER_SIZE);
int lastRxCounter;
int8_t *upTo;
int ci, cq;
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);
+ Dbprintf(" DMA: %i bytes", ISO14443B_DMA_BUFFER_SIZE);
// Signal field is off, no reader signal, no tag signal
LEDsoff();
// Setup for the DMA.
FpgaSetupSsc();
upTo = dmaBuf;
- lastRxCounter = DMA_BUFFER_SIZE;
- FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE);
+ 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;
-
+
// And now we loop, receiving samples.
for(;;) {
int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
- (DMA_BUFFER_SIZE-1);
+ (ISO14443B_DMA_BUFFER_SIZE-1);
if(behindBy > maxBehindBy) {
maxBehindBy = behindBy;
}
cq = upTo[1];
upTo += 2;
lastRxCounter -= 2;
- if(upTo >= dmaBuf + DMA_BUFFER_SIZE) {
+ if(upTo >= dmaBuf + ISO14443B_DMA_BUFFER_SIZE) {
upTo = dmaBuf;
- lastRxCounter += DMA_BUFFER_SIZE;
+ lastRxCounter += ISO14443B_DMA_BUFFER_SIZE;
AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
- AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
+ AT91C_BASE_PDC_SSC->PDC_RNCR = ISO14443B_DMA_BUFFER_SIZE;
WDT_HIT();
- if(behindBy > (9*DMA_BUFFER_SIZE/10)) { // TODO: understand whether we can increase/decrease as we want or not?
+ 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 (!TagIsActive) { // no need to try decoding reader data if the tag is sending
if(Handle14443bUartBit(ci & 0x01)) {
if(triggered && tracing) {
- //GetParity(Uart.output, Uart.byteCnt, parity);
LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE);
}
/* And ready to receive another command. */
}
if(Handle14443bUartBit(cq & 0x01)) {
if(triggered && tracing) {
- //GetParity(Uart.output, Uart.byteCnt, parity);
LogTrace(Uart.output, Uart.byteCnt, samples, samples, parity, TRUE);
}
/* And ready to receive another command. */
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;
FpgaSetupSsc();
set_tracing(TRUE);
-
-/* 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)) { // if field is off
- // FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ);
- // // Signal field is on with the appropriate LED
- // LED_D_ON();
- // SpinDelay(200);
- // }
CodeAndTransmit14443bAsReader(data, datalen);
uint16_t iLen = MIN(Demod.len, USB_CMD_DATA_SIZE);
cmd_send(CMD_ACK, iLen, 0, 0, Demod.output, iLen);
}
-
+
if(!powerfield) {
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LED_D_OFF();
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