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EM4x05: avoid false positives in preamble detection

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This commit is contained in:
Philippe Teuwen 2020-10-07 23:48:14 +02:00
parent 1d8c268b8b
commit 229da561d6
1 changed files with 3 additions and 2 deletions
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5
client/src/cmdlfem4x.c
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@ -739,8 +739,9 @@ static int doPreambleSearch(size_t *startIdx) {
return PM3_ESOFT;
}
// set size to 20 to only test first 14 positions for the preamble
size_t size = (20 > DemodBufferLen) ? DemodBufferLen : 20;
// set size to 9 to only test first 3 positions for the preamble
// do not set it too long else an error preamble followed by 010 could be seen as success.
size_t size = (9 > DemodBufferLen) ? DemodBufferLen : 9;
*startIdx = 0;
// skip first two 0 bits as they might have been missed in the demod
uint8_t preamble[EM_PREAMBLE_LEN] = {0, 0, 1, 0, 1, 0};