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14b: safer handling of corrupted signals

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This commit is contained in:
Philippe Teuwen 2020-10-02 00:58:41 +02:00
commit b1c1433e45
1 changed files with 10 additions and 0 deletions
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10
armsrc/iso14443b.c
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@ -893,6 +893,16 @@ static RAMFUNC int Handle14443bSamplesFromTag(int ci, int cq) {
break;
}
}
if (AMPLITUDE(ci, cq) < SUBCARRIER_DETECT_THRESHOLD) {
LED_C_OFF();
// subcarrier lost
Demod.state = DEMOD_UNSYNCD;
if (Demod.len > 0) { // no EOF but no signal anymore and we got data, e.g. ASK CTx
return true;
}
}
// we have still signal but no proper byte or EOF? this shouldn't happen
Demod.state = WAIT_FOR_RISING_EDGE_OF_SOF;
}
}
Demod.posCount = 0;