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hitag: wip

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This commit is contained in:
Philippe Teuwen 2020-01-15 02:02:42 +01:00
parent 4154f3dd1a
commit 6c0d6f0655
1 changed files with 13 additions and 11 deletions
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24
armsrc/hitag2.c
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@ -1337,7 +1337,7 @@ void ReaderHitag(hitag_function htf, hitag_data *htd) {
}
uint8_t tag_modulation;
size_t max_nrzs = 8 * HITAG_FRAME_LEN + 5;
size_t max_nrzs = (8 * HITAG_FRAME_LEN + 5) * 2; // up to 2 nrzs per bit
uint8_t nrz_samples[max_nrzs];
size_t nrzs = 0;
@ -1462,7 +1462,7 @@ void ReaderHitag(hitag_function htf, hitag_data *htd) {
break;
}
}
// Store the TX frame, we do this now at this point, to avoid delay in processing
// and to be able to overwrite the first samples with the trace (since they currently
// still use the same memory space)
@ -1509,23 +1509,25 @@ void ReaderHitag(hitag_function htf, hitag_data *htd) {
}
// Pack the response into a byte array
for (size_t i = 5; i < 37; i++){
for (size_t i = 5; i < nrzs; i++){
uint8_t bit = nrz_samples[i];
rx[rxlen / 8] |= bit << (7 - (rxlen % 8));
rxlen++;
}
if (rxlen % 8 == 1) // skip spurious bit
rxlen--;
// Check if frame was captured and store it
if (rxlen > 0) {
frame_count++;
if (bCollision){
// AC decoding hack
fix_ac_decoding(rx, 64);
rxlen = 32;
}
// if (bCollision){
// // AC decoding hack
// fix_ac_decoding(rx, 64);
// rxlen = 32;
// }
LogTrace(rx, rxlen, response, 0, NULL, false);
//Dbhexdump(rxlen, rx, false);
LogTrace(rx, nbytes(rxlen), response, 0, NULL, false);
Dbhexdump(nbytes(rxlen), rx, false);
}
}