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a couple em4x05 fixes.

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This commit is contained in:
marshmellow42 2017-02-16 13:57:14 -05:00
parent 59f726c989
commit 2d99d9912c
3 changed files with 21 additions and 18 deletions
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30
client/cmdlfem4x.c
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@ -514,17 +514,17 @@ int usage_lf_em_read(void) {
}
//search for given preamble in given BitStream and return success=1 or fail=0 and startIndex
uint8_t EMpreambleSearch(uint8_t *BitStream, uint8_t *preamble, size_t pLen, size_t size, size_t *startIdx)
{
uint8_t EMpreambleSearch(uint8_t *BitStream, uint8_t *preamble, size_t pLen, size_t size, size_t *startIdx) {
// Sanity check. If preamble length is bigger than bitstream length.
if ( size <= pLen ) return 0;
// em only sends preamble once, so look for it once in the first x bits
uint8_t foundCnt = 0;
for (int idx = 0; idx < size - pLen; idx++){
for (size_t idx = 0; idx < size - pLen; idx++){
if (memcmp(BitStream+idx, preamble, pLen) == 0){
//first index found
foundCnt++;
if (foundCnt == 1) {
if (g_debugMode) PrintAndLog("DEBUG: preamble found at %u", idx);
*startIdx = idx;
return 1;
}
@ -542,6 +542,7 @@ int demodEM4x05resp(uint8_t bitsNeeded) {
DemodBufferLen = 0x00;
// skip first two 0 bits as they might have been missed in the demod
uint8_t preamble[6] = {0,0,1,0,1,0};
size_t startIdx = 0;
// test for FSK wave (easiest to 99% ID)
if (GetFskClock("", FALSE, FALSE)) {
@ -552,11 +553,11 @@ int demodEM4x05resp(uint8_t bitsNeeded) {
} else {
// set size to 10 to only test first 4 positions for the preamble
size_t size = (10 > DemodBufferLen) ? DemodBufferLen : 10;
size_t startIdx = 0;
startIdx = 0;
if (g_debugMode) PrintAndLog("ANS: %d | %u | %u", ans, startIdx, size);
uint8_t errChk = !EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx);
uint8_t errChk = EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx);
if ( errChk == 0) {
if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", startIdx);
} else {
@ -577,18 +578,19 @@ int demodEM4x05resp(uint8_t bitsNeeded) {
// more common than biphase
if (!demodFound) {
DemodBufferLen = 0x00;
bool stcheck = false;
// try manchester - NOTE: ST only applies to T55x7 tags.
ans = ASKDemod_ext("0,0,1", false, false, 1, false);
ans = ASKDemod_ext("0,0,1", false, false, 1, &stcheck);
if (!ans) {
if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/Manchester Demod failed");
} else {
// set size to 10 to only test first 4 positions for the preamble
size_t size = (10 > DemodBufferLen) ? DemodBufferLen : 10;
size_t startIdx = 0;
startIdx = 0;
if (g_debugMode) PrintAndLog("ANS: %d | %u | %u", ans, startIdx, size);
uint8_t errChk = !EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx);
uint8_t errChk = EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx);
if ( errChk == 0) {
if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", startIdx);
} else {
@ -608,11 +610,11 @@ int demodEM4x05resp(uint8_t bitsNeeded) {
} else {
// set size to 10 to only test first 4 positions for the preamble
size_t size = (10 > DemodBufferLen) ? DemodBufferLen : 10;
size_t startIdx = 0;
startIdx = 0;
if (g_debugMode) PrintAndLog("ANS: %d | %u | %u", ans, startIdx, size);
uint8_t errChk = !EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx);
uint8_t errChk = EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx);
if ( errChk == 0) {
if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", startIdx);
} else {
@ -632,11 +634,11 @@ int demodEM4x05resp(uint8_t bitsNeeded) {
} else {
// set size to 10 to only test first 4 positions for the preamble
size_t size = (10 > DemodBufferLen) ? DemodBufferLen : 10;
size_t startIdx = 0;
startIdx = 0;
if (g_debugMode) PrintAndLog("ANS: %d | %u | %u", ans, startIdx, size);
uint8_t errChk = !EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx);
uint8_t errChk = EMpreambleSearch(DemodBuffer, preamble, sizeof(preamble), size, &startIdx);
if ( errChk == 0) {
if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", startIdx);
} else {
@ -649,7 +651,7 @@ int demodEM4x05resp(uint8_t bitsNeeded) {
if (demodFound && bitsNeeded < DemodBufferLen) {
if (bitsNeeded > 0) {
setDemodBuf(DemodBuffer + ans + sizeof(preamble), bitsNeeded, 0);
setDemodBuf(DemodBuffer + startIdx + sizeof(preamble), bitsNeeded, 0);
CmdPrintDemodBuff("x");
}
return 1;
@ -701,7 +703,7 @@ int CmdReadWord(const char *Cmd) {
//attempt demod:
//need 32 bits from a read word
return demodEM4x05resp(32);
return demodEM4x05resp(44);
}
int usage_lf_em_write(void) {