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adjust pskdemod

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add skipped bits before first phase back in
PSKDemod now returns 1 for success or 0 for fail like other demods
This commit is contained in:
marshmellow42 2015-03-13 20:49:34 -04:00
parent e74fc2ecba
commit 7a8a982bde
2 changed files with 31 additions and 32 deletions
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54
client/cmddata.c
View file

@ -1700,7 +1700,7 @@ int PSKDemod(const char *Cmd, bool verbose)
}
if (invert != 0 && invert != 1) {
if (verbose) PrintAndLog("Invalid argument: %s", Cmd);
return -1;
return 0;
}
uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
size_t BitLen = getFromGraphBuf(BitStream);
@ -1708,22 +1708,27 @@ int PSKDemod(const char *Cmd, bool verbose)
uint8_t carrier=countPSK_FC(BitStream, BitLen);
if (carrier!=2 && carrier!=4 && carrier!=8){
//invalid carrier
return -1;
return 0;
}
int errCnt=0;
errCnt = pskRawDemod(BitStream, &BitLen, &clk, &invert);
if (errCnt > maxErr){
if (g_debugMode==1 && verbose) PrintAndLog("Too many errors found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
return -1;
return 0;
}
if (errCnt<0|| BitLen<16){ //throw away static - allow 1 and -1 (in case of threshold command first)
if (g_debugMode==1 && verbose) PrintAndLog("no data found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
return -1;
return 0;
}
if (verbose){
PrintAndLog("Tried PSK Demod using Clock: %d - invert: %d - Bits Found: %d",clk,invert,BitLen);
if (errCnt>0){
PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt);
}
}
if (verbose) PrintAndLog("Tried PSK Demod using Clock: %d - invert: %d - Bits Found: %d",clk,invert,BitLen);
//prime demod buffer for output
setDemodBuf(BitStream,BitLen,0);
return errCnt;
return 1;
}
// Indala 26 bit decode
@ -1738,7 +1743,7 @@ int CmdIndalaDecode(const char *Cmd)
ans = PSKDemod("32", 0);
}
if (ans < 0){
if (!ans){
if (g_debugMode==1)
PrintAndLog("Error1: %d",ans);
return 0;
@ -1879,7 +1884,7 @@ int CmdNRZrawDemod(const char *Cmd)
// prints binary found and saves in demodbuffer for further commands
int CmdPSK1rawDemod(const char *Cmd)
{
int errCnt;
int ans;
char cmdp = param_getchar(Cmd, 0);
if (strlen(Cmd) > 10 || cmdp == 'h' || cmdp == 'H') {
PrintAndLog("Usage: data rawdemod p1 [clock] <0|1> [maxError]");
@ -1894,15 +1899,13 @@ int CmdPSK1rawDemod(const char *Cmd)
PrintAndLog(" : data rawdemod p1 64 1 0 = demod a psk1 tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
return 0;
}
errCnt = PSKDemod(Cmd, TRUE);
ans = PSKDemod(Cmd, TRUE);
//output
if (errCnt<0){
if (g_debugMode) PrintAndLog("Error demoding: %d",errCnt);
if (!ans){
if (g_debugMode) PrintAndLog("Error demoding: %d",ans);
return 0;
}
if (errCnt>0){
PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt);
}
PrintAndLog("PSK demoded bitstream:");
// Now output the bitstream to the scrollback by line of 16 bits
printDemodBuff();
@ -1913,7 +1916,7 @@ int CmdPSK1rawDemod(const char *Cmd)
// takes same args as cmdpsk1rawdemod
int CmdPSK2rawDemod(const char *Cmd)
{
int errCnt=0;
int ans=0;
char cmdp = param_getchar(Cmd, 0);
if (strlen(Cmd) > 10 || cmdp == 'h' || cmdp == 'H') {
PrintAndLog("Usage: data rawdemod p2 [clock] <0|1> [maxError]");
@ -1928,24 +1931,15 @@ int CmdPSK2rawDemod(const char *Cmd)
PrintAndLog(" : data rawdemod p2 64 1 0 = demod a psk2 tag from GraphBuffer using a clock of RF/64, inverting output and allowing 0 demod errors");
return 0;
}
errCnt=PSKDemod(Cmd, TRUE);
if (errCnt<0){
if (g_debugMode) PrintAndLog("Error demoding: %d",errCnt);
ans=PSKDemod(Cmd, TRUE);
if (!ans){
if (g_debugMode) PrintAndLog("Error demoding: %d",ans);
return 0;
}
psk1TOpsk2(DemodBuffer, DemodBufferLen);
if (errCnt>0){
if (g_debugMode){
PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt);
PrintAndLog("PSK2 demoded bitstream:");
// Now output the bitstream to the scrollback by line of 16 bits
printDemodBuff();
}
}else{
PrintAndLog("PSK2 demoded bitstream:");
// Now output the bitstream to the scrollback by line of 16 bits
printDemodBuff();
}
PrintAndLog("PSK2 demoded bitstream:");
// Now output the bitstream to the scrollback by line of 16 bits
printDemodBuff();
return 1;
}

9
common/lfdemod.c
View file

@ -1079,7 +1079,9 @@ void psk1TOpsk2(uint8_t *BitStream, size_t size)
size_t i=1;
uint8_t lastBit=BitStream[0];
for (; i<size; i++){
if (lastBit!=BitStream[i]){
if (BitStream[i]==77){
//ignore errors
} else if (lastBit!=BitStream[i]){
lastBit=BitStream[i];
BitStream[i]=1;
} else {
@ -1619,10 +1621,13 @@ int pskRawDemod(uint8_t dest[], size_t *size, int *clock, int *invert)
}
//PrintAndLog("DEBUG: firstFullWave: %d, waveLen: %d",firstFullWave,fullWaveLen);
lastClkBit = firstFullWave; //set start of wave as clock align
//PrintAndLog("DEBUG: clk: %d, lastClkBit: %d", *clock, lastClkBit);
waveStart = 0;
errCnt=0;
size_t numBits=0;
//PrintAndLog("DEBUG: clk: %d, lastClkBit: %d", *clock, lastClkBit);
//set skipped bits
memset(dest+numBits,curPhase^1,firstFullWave / *clock);
numBits += (firstFullWave / *clock);
dest[numBits++] = curPhase; //set first read bit
for (i = firstFullWave+fullWaveLen-1; i < *size-3; i++){
//top edge of wave = start of new wave