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EM4x05: use full preambles

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This commit is contained in:
Philippe Teuwen 2020-10-19 00:51:20 +02:00
commit dd6044e508
1 changed files with 5 additions and 5 deletions
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10
client/src/cmdlfem4x05.c
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@ -147,7 +147,7 @@ static bool EM_ColParityTest(uint8_t *bs, size_t size, uint8_t rows, uint8_t col
return true;
}
#define EM_PREAMBLE_LEN 6
#define EM_PREAMBLE_LEN 8
// download samples from device and copy to Graphbuffer
static bool downloadSamplesEM(void) {
@ -178,15 +178,15 @@ static int doPreambleSearch(size_t *startIdx) {
return PM3_ESOFT;
}
// set size to 9 to only test first 3 positions for the preamble
// set size to 11 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;
size_t size = (11 > DemodBufferLen) ? DemodBufferLen : 11;
*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};
uint8_t preamble[EM_PREAMBLE_LEN] = {0, 0, 0, 0, 1, 0, 1, 0};
if (!preambleSearchEx(DemodBuffer, preamble, EM_PREAMBLE_LEN, &size, startIdx, true)) {
uint8_t errpreamble[EM_PREAMBLE_LEN] = {0, 0, 0, 0, 0, 1};
uint8_t errpreamble[EM_PREAMBLE_LEN] = {0, 0, 0, 0, 0, 0, 0, 1};
if (!preambleSearchEx(DemodBuffer, errpreamble, EM_PREAMBLE_LEN, &size, startIdx, true)) {
PrintAndLogEx(DEBUG, "DEBUG: Error - EM4305 preamble not found :: %zu", *startIdx);
return PM3_ESOFT;