From 01d0f8ae8f9517baae6b5f1d033312e04c0d6a34 Mon Sep 17 00:00:00 2001 From: marshmellow42 Date: Fri, 20 Jan 2017 00:55:40 -0500 Subject: [PATCH] bug fixes - LF rawdemod am and ST rawdemod parameter length test too short for help text amp option should amp prior to ST check ST check adjusted to make room for rf/32 clock instead of rf/64 (so will have extra room if clock is higher than 32) ST check improved to better account for low drift --- client/cmddata.c | 23 +++++++++++++---------- common/lfdemod.c | 40 +++++++++++++++++++++++++++++----------- common/lfdemod.h | 1 + 3 files changed, 43 insertions(+), 21 deletions(-) diff --git a/client/cmddata.c b/client/cmddata.c index 86dac423..2db1f8eb 100644 --- a/client/cmddata.c +++ b/client/cmddata.c @@ -317,7 +317,7 @@ int ASKDemod_ext(const char *Cmd, bool verbose, bool emSearch, uint8_t askType, int clk=0; int maxErr=100; int maxLen=0; - uint8_t askAmp = 0; + uint8_t askamp = 0; char amp = param_getchar(Cmd, 0); uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0}; sscanf(Cmd, "%i %i %i %i %c", &clk, &invert, &maxErr, &maxLen, &); @@ -330,12 +330,15 @@ int ASKDemod_ext(const char *Cmd, bool verbose, bool emSearch, uint8_t askType, invert=1; clk=0; } - if (amp == 'a' || amp == 'A') askAmp=1; size_t BitLen = getFromGraphBuf(BitStream); if (g_debugMode) PrintAndLog("DEBUG: Bitlen from grphbuff: %d",BitLen); if (BitLen < 255) return 0; if (maxLen < BitLen && maxLen != 0) BitLen = maxLen; int foundclk = 0; + //amp before ST check + if (amp == 'a' || amp == 'A') { + askAmp(BitStream, BitLen); + } bool st = false; if (*stCheck) st = DetectST(BitStream, &BitLen, &foundclk); if (st) { @@ -343,7 +346,7 @@ int ASKDemod_ext(const char *Cmd, bool verbose, bool emSearch, uint8_t askType, clk = (clk == 0) ? foundclk : clk; if (verbose || g_debugMode) PrintAndLog("\nFound Sequence Terminator"); } - int errCnt = askdemod(BitStream, &BitLen, &clk, &invert, maxErr, askAmp, askType); + int errCnt = askdemod(BitStream, &BitLen, &clk, &invert, maxErr, askamp, askType); if (errCnt<0 || BitLen<16){ //if fatal error (or -1) if (g_debugMode) PrintAndLog("DEBUG: no data found %d, errors:%d, bitlen:%d, clock:%d",errCnt,invert,BitLen,clk); return 0; @@ -383,7 +386,7 @@ int ASKDemod(const char *Cmd, bool verbose, bool emSearch, uint8_t askType) { int Cmdaskmandemod(const char *Cmd) { char cmdp = param_getchar(Cmd, 0); - if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') { + if (strlen(Cmd) > 45 || cmdp == 'h' || cmdp == 'H') { PrintAndLog("Usage: data rawdemod am [clock] [maxError] [maxLen] [amplify]"); PrintAndLog(" ['s'] optional, check for Sequence Terminator"); PrintAndLog(" [set clock as integer] optional, if not set, autodetect"); @@ -678,7 +681,7 @@ int CmdVikingDemod(const char *Cmd) int Cmdaskrawdemod(const char *Cmd) { char cmdp = param_getchar(Cmd, 0); - if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') { + if (strlen(Cmd) > 35 || cmdp == 'h' || cmdp == 'H') { PrintAndLog("Usage: data rawdemod ar [clock] [maxError] [maxLen] [amplify]"); PrintAndLog(" [set clock as integer] optional, if not set, autodetect"); PrintAndLog(" , 1 to invert output"); @@ -1012,7 +1015,7 @@ int FSKrawDemod(const char *Cmd, bool verbose) int CmdFSKrawdemod(const char *Cmd) { char cmdp = param_getchar(Cmd, 0); - if (strlen(Cmd) > 10 || cmdp == 'h' || cmdp == 'H') { + if (strlen(Cmd) > 20 || cmdp == 'h' || cmdp == 'H') { PrintAndLog("Usage: data rawdemod fs [clock] [fchigh] [fclow]"); PrintAndLog(" [set clock as integer] optional, omit for autodetect."); PrintAndLog(" , 1 for invert output, can be used even if the clock is omitted"); @@ -1769,7 +1772,7 @@ int NRZrawDemod(const char *Cmd, bool verbose) int CmdNRZrawDemod(const char *Cmd) { char cmdp = param_getchar(Cmd, 0); - if (strlen(Cmd) > 10 || cmdp == 'h' || cmdp == 'H') { + if (strlen(Cmd) > 16 || cmdp == 'h' || cmdp == 'H') { PrintAndLog("Usage: data rawdemod nr [clock] <0|1> [maxError]"); PrintAndLog(" [set clock as integer] optional, if not set, autodetect."); PrintAndLog(" , 1 for invert output"); @@ -1793,7 +1796,7 @@ int CmdPSK1rawDemod(const char *Cmd) { int ans; char cmdp = param_getchar(Cmd, 0); - if (strlen(Cmd) > 10 || cmdp == 'h' || cmdp == 'H') { + if (strlen(Cmd) > 16 || cmdp == 'h' || cmdp == 'H') { PrintAndLog("Usage: data rawdemod p1 [clock] <0|1> [maxError]"); PrintAndLog(" [set clock as integer] optional, if not set, autodetect."); PrintAndLog(" , 1 for invert output"); @@ -1825,7 +1828,7 @@ int CmdPSK2rawDemod(const char *Cmd) { int ans=0; char cmdp = param_getchar(Cmd, 0); - if (strlen(Cmd) > 10 || cmdp == 'h' || cmdp == 'H') { + if (strlen(Cmd) > 16 || cmdp == 'h' || cmdp == 'H') { PrintAndLog("Usage: data rawdemod p2 [clock] <0|1> [maxError]"); PrintAndLog(" [set clock as integer] optional, if not set, autodetect."); PrintAndLog(" , 1 for invert output"); @@ -1855,7 +1858,7 @@ int CmdRawDemod(const char *Cmd) { char cmdp = Cmd[0]; //param_getchar(Cmd, 0); - if (strlen(Cmd) > 20 || cmdp == 'h' || cmdp == 'H' || strlen(Cmd)<2) { + if (strlen(Cmd) > 35 || cmdp == 'h' || cmdp == 'H' || strlen(Cmd)<2) { PrintAndLog("Usage: data rawdemod [modulation] |"); PrintAndLog(" [modulation] as 2 char, 'ab' for ask/biphase, 'am' for ask/manchester, 'ar' for ask/raw, 'fs' for fsk, ..."); PrintAndLog(" 'nr' for nrz/direct, 'p1' for psk1, 'p2' for psk2"); diff --git a/common/lfdemod.c b/common/lfdemod.c index 7d40df3a..8324c440 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -270,7 +270,7 @@ void askAmp(uint8_t *BitStream, size_t size) } return; } - + //by marshmellow //attempts to demodulate ask modulations, askType == 0 for ask/raw, askType==1 for ask/manchester int askdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert, int maxErr, uint8_t amp, uint8_t askType) @@ -280,7 +280,7 @@ int askdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert, int maxErr if (*clk==0 || start < 0) return -3; if (*invert != 1) *invert = 0; if (amp==1) askAmp(BinStream, *size); - if (g_debugMode==2) prnt("DEBUG ASK: clk %d, beststart %d", *clk, start); + if (g_debugMode==2) prnt("DEBUG ASK: clk %d, beststart %d, amp %d", *clk, start, amp); uint8_t initLoopMax = 255; if (initLoopMax > *size) initLoopMax = *size; @@ -1555,8 +1555,8 @@ bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) { int tol = 0; int i, j, skip, start, end, low, high, minClk, waveStart; bool complete = false; - int tmpbuff[bufsize / 64]; - int waveLen[bufsize / 64]; + int tmpbuff[bufsize / 32]; //guess rf/32 clock, if click is smaller we will only have room for a fraction of the samples captured + int waveLen[bufsize / 32]; // if clock is larger then we waste memory in array size that is not needed... size_t testsize = (bufsize < 512) ? bufsize : 512; int phaseoff = 0; high = low = 128; @@ -1588,7 +1588,7 @@ bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) { waveStart = i; while ((buffer[i] > low) && (i < bufsize)) ++i; - if (j >= (bufsize/64)) { + if (j >= (bufsize/32)) { break; } waveLen[j] = i - waveStart; //first high to first low @@ -1634,6 +1634,8 @@ bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) { if (start < 0) { if (g_debugMode==2) prnt("DEBUG STT: first STT not found - quitting"); return false; + } else { + if (g_debugMode==2) prnt("DEBUG STT: first STT found at: %d, j=%d",start, j); } if (waveLen[i+2] > clk*1+tol) phaseoff = 0; @@ -1647,7 +1649,7 @@ bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) { end = skip; for (i += 3; i < j - 4; ++i) { end += tmpbuff[i]; - if (tmpbuff[i] >= clk*1-tol && tmpbuff[i] <= (clk*2)+tol) { //1 to 2 clocks depending on 2 bits prior + if (tmpbuff[i] >= clk*1-tol && tmpbuff[i] <= (clk*2)+tol && waveLen[i] < clk+tol) { //1 to 2 clocks depending on 2 bits prior if (tmpbuff[i+1] >= clk*2-tol && tmpbuff[i+1] <= clk*2+tol && waveLen[i+1] > clk*3/2-tol) { //2 clocks and wave size is 1 1/2 if (tmpbuff[i+2] >= (clk*3)/2-tol && tmpbuff[i+2] <= clk*2+tol && waveLen[i+2] > clk-tol) { //1 1/2 to 2 clocks and at least one full clock wave if (tmpbuff[i+3] >= clk*1-tol && tmpbuff[i+3] <= clk*2+tol) { //1 to 2 clocks for end of ST + first bit @@ -1669,12 +1671,15 @@ bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) { start = skip; size_t datalen = end - start; // check validity of datalen (should be even clock increments) - use a tolerance of up to 1/8th a clock - if (datalen % clk > clk/8) { + if ( clk - (datalen % clk) <= clk/8) { + // padd the amount off - could be problematic... but shouldn't happen often + datalen += clk - (datalen % clk); + } else if ( (datalen % clk) <= clk/8 ) { + // padd the amount off - could be problematic... but shouldn't happen often + datalen -= datalen % clk; + } else { if (g_debugMode==2) prnt("DEBUG STT: datalen not divisible by clk: %u %% %d = %d - quitting", datalen, clk, datalen % clk); return false; - } else { - // padd the amount off - could be problematic... but shouldn't happen often - datalen += datalen % clk; } // if datalen is less than one t55xx block - ERROR if (datalen/clk < 8*4) { @@ -1682,8 +1687,20 @@ bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) { return false; } size_t dataloc = start; + if (buffer[dataloc-(clk*4)-(clk/8)] <= low && buffer[dataloc] <= low && buffer[dataloc-(clk*4)] >= high) { + //we have low drift (and a low just before the ST and a low just after the ST) - compensate by backing up the start + for ( i=0; i <= (clk/8); ++i ) { + if ( buffer[dataloc - (clk*4) - i] <= low ) { + dataloc -= i; + break; + } + } + } + size_t newloc = 0; i=0; + if (g_debugMode==2) prnt("DEBUG STT: Starting STT trim - start: %d, datalen: %d ",dataloc, datalen); + // warning - overwriting buffer given with raw wave data with ST removed... while ( dataloc < bufsize-(clk/2) ) { //compensate for long high at end of ST not being high due to signal loss... (and we cut out the start of wave high part) @@ -1697,11 +1714,12 @@ bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) { if (i+newloc < dataloc) buffer[i+newloc] = buffer[dataloc]; - dataloc++; + dataloc++; } } newloc += i; //skip next ST - we just assume it will be there from now on... + if (g_debugMode==2) prnt("DEBUG STT: skipping STT at %d to %d", dataloc, dataloc+(clk*4)); dataloc += clk*4; } *size = newloc; diff --git a/common/lfdemod.h b/common/lfdemod.h index 56c758ae..b988c1bf 100644 --- a/common/lfdemod.h +++ b/common/lfdemod.h @@ -19,6 +19,7 @@ //generic size_t addParity(uint8_t *BitSource, uint8_t *dest, uint8_t sourceLen, uint8_t pLen, uint8_t pType); int askdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert, int maxErr, uint8_t amp, uint8_t askType); +void askAmp(uint8_t *BitStream, size_t size); int BiphaseRawDecode(uint8_t * BitStream, size_t *size, int offset, int invert); uint32_t bytebits_to_byte(uint8_t* src, size_t numbits); uint32_t bytebits_to_byteLSBF(uint8_t* src, size_t numbits); -- 2.39.2