ShowWaitCycles = true;
}
- uint8_t got[TRACE_BUFFER_SIZE];
- GetFromBigBuf(got,sizeof(got),0);
+ uint8_t trace[TRACE_BUFFER_SIZE];
+ GetFromBigBuf(trace,TRACE_BUFFER_SIZE,0);
WaitForResponse(CMD_ACK,NULL);
PrintAndLog("Recorded Activity");
PrintAndLog(" Start | End | Src | Data");
PrintAndLog("-----------|-----------|-----|--------");
- int i = 0;
- uint32_t first_timestamp = 0;
+ uint16_t tracepos = 0;
+ uint16_t duration;
+ uint16_t data_len;
+ uint16_t parity_len;
+ bool isResponse;
uint32_t timestamp;
- uint32_t EndOfTransmissionTimestamp = 0;
+ uint32_t first_timestamp;
+ uint32_t EndOfTransmissionTimestamp;
for (;;) {
- if(i >= TRACE_BUFFER_SIZE) {
- break;
+
+ if( tracepos >= TRACE_BUFFER_SIZE) break;
+
+ timestamp = *((uint32_t *)(trace + tracepos));
+ if(tracepos == 0) {
+ first_timestamp = timestamp;
}
-
- bool isResponse;
- timestamp = *((uint32_t *)(got+i));
- if (timestamp & 0x80000000) {
- timestamp &= 0x7fffffff;
- isResponse = true;
+ tracepos += 4;
+ duration = *((uint16_t *)(trace + tracepos));
+ tracepos += 2;
+ data_len = *((uint16_t *)(trace + tracepos));
+ tracepos += 2;
+
+ if (data_len & 0x8000) {
+ data_len &= 0x7fff;
+ isResponse = true;
} else {
- isResponse = false;
+ isResponse = false;
}
- if(i==0) {
- first_timestamp = timestamp;
- }
-
- int parityBits = *((uint32_t *)(got+i+4));
+ parity_len = (data_len-1)/8 + 1;
- int len = got[i+8];
- if (len > 100) {
- break;
- }
- if (i + len >= TRACE_BUFFER_SIZE) {
- break;
- }
+ if (tracepos + data_len + parity_len >= TRACE_BUFFER_SIZE) { break; }
- uint8_t *frame = (got+i+9);
+ uint8_t *frame = trace + tracepos;
+ tracepos += data_len;
+ uint8_t *parityBytes = trace + tracepos;
+ tracepos += parity_len;
// Break and stick with current result if buffer was not completely full
- if (frame[0] == 0x44 && frame[1] == 0x44 && frame[2] == 0x44 && frame[3] == 0x44) break;
+ if (timestamp == 0x44444444) break;
char line[1000] = "";
int j;
- if (len) {
- for (j = 0; j < len; j++) {
- int oddparity = 0x01;
- int k;
-
- for (k=0;k<8;k++) {
- oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01);
- }
+ for (j = 0; j < data_len; j++) {
+ int oddparity = 0x01;
+ int k;
- //if((parityBits >> (len - j - 1)) & 0x01) {
- if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) {
- sprintf(line+(j*4), "%02x! ", frame[j]);
- } else {
- sprintf(line+(j*4), "%02x ", frame[j]);
- }
+ for (k=0;k<8;k++) {
+ oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01);
}
- } else {
- if (ShowWaitCycles) {
- uint32_t next_timestamp = (*((uint32_t *)(got+i+9))) & 0x7fffffff;
- sprintf(line, "fdt (Frame Delay Time): %d", (next_timestamp - timestamp));
+
+ uint8_t parityBits = parityBytes[j>>3];
+ if (isResponse && (oddparity != ((parityBits >> (7-(j&0x0007))) & 0x01))) {
+ sprintf(line+(j*4), "%02x! ", frame[j]);
+ } else {
+ sprintf(line+(j*4), "%02x ", frame[j]);
}
}
-
- char *crc;
- crc = "";
- if (len > 2) {
+
+ char crc[6] = "";
+ if (data_len > 2) {
uint8_t b1, b2;
- for (j = 0; j < (len - 1); j++) {
- // gives problems... search for the reason..
- /*if(frame[j] == 0xAA) {
- switch(frame[j+1]) {
- case 0x01:
- crc = "[1] Two drops close after each other";
- break;
- case 0x02:
- crc = "[2] Potential SOC with a drop in second half of bitperiod";
- break;
- case 0x03:
- crc = "[3] Segment Z after segment X is not possible";
- break;
- case 0x04:
- crc = "[4] Parity bit of a fully received byte was wrong";
- break;
- default:
- crc = "[?] Unknown error";
- break;
- }
- break;
- }*/
- }
-
- if (strlen(crc)==0) {
- ComputeCrc14443(CRC_14443_A, frame, len-2, &b1, &b2);
- if (b1 != frame[len-2] || b2 != frame[len-1]) {
- crc = (isResponse & (len < 6)) ? "" : " !crc";
- } else {
- crc = "";
- }
+ ComputeCrc14443(CRC_14443_A, frame, data_len-2, &b1, &b2);
+ if (b1 != frame[data_len-2] || b2 != frame[data_len-1]) {
+ sprintf(crc, (isResponse & (data_len < 6)) ? "" : " !crc");
+ } else {
+ sprintf(crc, "");
}
- } else {
- crc = ""; // SHORT
- }
-
- i += (len + 9);
-
- EndOfTransmissionTimestamp = (*((uint32_t *)(got+i))) & 0x7fffffff;
- if (!ShowWaitCycles) i += 9;
+ EndOfTransmissionTimestamp = timestamp + duration;
PrintAndLog(" %9d | %9d | %s | %s %s",
(timestamp - first_timestamp),
(EndOfTransmissionTimestamp - first_timestamp),
- (len?(isResponse ? "Tag" : "Rdr"):" "),
- line, crc);
-
+ (isResponse ? "Tag" : "Rdr"),
+ line,
+ crc);
+
+ bool next_isResponse = *((uint16_t *)(trace + tracepos + 6)) & 0x8000;
+ if (ShowWaitCycles && !isResponse && next_isResponse) {
+ uint32_t next_timestamp = *((uint32_t *)(trace + tracepos));
+ if (next_timestamp != 0x44444444) {
+ PrintAndLog(" %9d | %9d | %s | fdt (Frame Delay Time): %d",
+ (EndOfTransmissionTimestamp - first_timestamp),
+ (next_timestamp - first_timestamp),
+ " ",
+ (next_timestamp - EndOfTransmissionTimestamp));
+ }
+ }
+ }
}
return 0;
}
projects / proxmark3-svn / blobdiff