From 84871873a41a6eb80dd836efdbf4722ffcea089a Mon Sep 17 00:00:00 2001 From: marshmellow42 Date: Tue, 13 Jan 2015 17:21:36 -0500 Subject: [PATCH] Small lf bug fixes and threshold adjustments adjusted lf demod thresholds based on additional testing fixed bug in hid bit length calc in cmddata.c fixed bugs in lf search --- client/cmddata.c | 53 +++++++++++++++++++++++++++++++----------------- client/cmdlf.c | 33 ++++++++++++++++++++---------- common/lfdemod.c | 34 +++++++++++++++---------------- 3 files changed, 73 insertions(+), 47 deletions(-) diff --git a/client/cmddata.c b/client/cmddata.c index ed0a0758..a88fa4e1 100644 --- a/client/cmddata.c +++ b/client/cmddata.c @@ -618,7 +618,7 @@ int CmdFSKdemodHID(const char *Cmd) uint32_t cardnum = 0; if (((hi>>5)&1)==1){//if bit 38 is set then < 37 bit format is used uint32_t lo2=0; - lo2=(((hi & 15) << 12) | (lo>>20)); //get bits 21-37 to check for format len bit + lo2=(((hi & 31) << 12) | (lo>>20)); //get bits 21-37 to check for format len bit uint8_t idx3 = 1; while(lo2>1){ //find last bit set to 1 (format len bit) lo2=lo2>>1; @@ -631,10 +631,6 @@ int CmdFSKdemodHID(const char *Cmd) cardnum = (lo>>1)&0xFFFF; fc = (lo>>17)&0xFF; } - if(fmtLen==37){ - cardnum = (lo>>1)&0x7FFFF; - fc = ((hi&0xF)<<12)|(lo>>20); - } if(fmtLen==34){ cardnum = (lo>>1)&0xFFFF; fc= ((hi&1)<<15)|(lo>>17); @@ -645,10 +641,10 @@ int CmdFSKdemodHID(const char *Cmd) } } else { //if bit 38 is not set then 37 bit format is used - fmtLen= 37; - fc =0; - cardnum=0; - if(fmtLen==37){ + fmtLen = 37; + fc = 0; + cardnum = 0; + if(fmtLen == 37){ cardnum = (lo>>1)&0x7FFFF; fc = ((hi&0xF)<<12)|(lo>>20); } @@ -870,24 +866,35 @@ int PSKnrzDemod(const char *Cmd){ // optional arguments - same as CmdpskNRZrawDemod (clock & invert) int CmdIndalaDecode(const char *Cmd) { - int ans; - if (strlen(Cmd)>0) - ans=PSKnrzDemod(Cmd); - else - ans=PSKnrzDemod("32"); + uint8_t verbose = 1; + int ans; + if (strlen(Cmd)>0){ + if (Cmd[0]=='0'){ + verbose=0; + ans = PSKnrzDemod("32"); + }else{ + ans = PSKnrzDemod(Cmd); + } + } else{ //default to RF/32 + ans = PSKnrzDemod("32"); + } if (ans < 0){ - PrintAndLog("Error1: %d",ans); + if (verbose) + PrintAndLog("Error1: %d",ans); return 0; } uint8_t invert=0; ans = indala26decode(DemodBuffer,(size_t *) &DemodBufferLen, &invert); if (ans < 1) { - PrintAndLog("Error2: %d",ans); + if (verbose) + PrintAndLog("Error2: %d",ans); return -1; } char showbits[251]; - if(invert==1) PrintAndLog("Had to invert bits"); + if (invert) + if (verbose) + PrintAndLog("Had to invert bits"); //convert UID to HEX uint32_t uid1, uid2, uid3, uid4, uid5, uid6, uid7; int idx; @@ -951,11 +958,19 @@ int CmdPskClean(const char *Cmd) //prints binary found and saves in graphbuffer for further commands int CmdpskNRZrawDemod(const char *Cmd) { - int errCnt= PSKnrzDemod(Cmd); + uint8_t verbose = 1; + int errCnt; + if (strlen(Cmd)>0){ + if (Cmd[0]=='0') + verbose=0; + } + + errCnt = PSKnrzDemod(Cmd); //output if (errCnt<0) return 0; if (errCnt>0){ - PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt); + if (verbose) + PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt); } PrintAndLog("PSK or NRZ demoded bitstream:"); // Now output the bitstream to the scrollback by line of 16 bits diff --git a/client/cmdlf.c b/client/cmdlf.c index 65d6fdd5..e3361cb5 100644 --- a/client/cmdlf.c +++ b/client/cmdlf.c @@ -566,26 +566,37 @@ int CmdLFfind(const char *Cmd) return 0; } - if (!offline || (cmdp != '1') ){ + if (!offline && (cmdp != '1')){ ans=CmdLFRead(""); - ans=CmdSamples("20000"); + ans=CmdSamples("20000"); } else if (GraphTraceLen < 1000) { PrintAndLog("Data in Graphbuffer was too small."); return 0; } + PrintAndLog("NOTE: some demods output possible binary\n if it finds something that looks like a tag"); PrintAndLog("Checking for known tags:"); - ans=Cmdaskmandemod(""); - if (ans>0) return 1; - ans=CmdFSKdemodHID(""); - if (ans>0) return 1; ans=CmdFSKdemodIO(""); - if (ans>0) return 1; + if (ans>0) { + PrintAndLog("Valid IO Prox ID Found!"); + return 1; + } + ans=CmdFSKdemodHID(""); + if (ans>0) { + PrintAndLog("Valid HID Prox ID Found!"); + return 1; + } //add psk and indala - ans=CmdIndalaDemod(""); - if (ans>0) return 1; - ans=CmdIndalaDemod("224"); - if (ans>0) return 1; + ans=CmdIndalaDecode("0"); + if (ans>0) { + PrintAndLog("Valid Indala ID Found!"); + return 1; + } + ans=Cmdaskmandemod(""); + if (ans>0) { + PrintAndLog("Valid EM410x ID Found!"); + return 1; + } PrintAndLog("No Known Tags Found!\n"); return 0; } diff --git a/common/lfdemod.c b/common/lfdemod.c index 11ad1403..2352caad 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -19,7 +19,7 @@ uint64_t Em410xDecode(uint8_t *BitStream, size_t size) //no arguments needed - built this way in case we want this to be a direct call from "data " cmds in the future // otherwise could be a void with no arguments //set defaults - int high=0, low=128; + int high=0, low=255; uint64_t lo=0; uint32_t i = 0; @@ -84,7 +84,7 @@ uint64_t Em410xDecode(uint8_t *BitStream, size_t size) int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) { int i; - int high = 0, low = 128; + int high = 0, low = 255; *clk=DetectASKClock(BinStream, *size, *clk); //clock default if (*clk<8) *clk =64; @@ -100,7 +100,7 @@ int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) else if (BinStream[i] < low) low = BinStream[i]; } - if ((high < 158) ){ //throw away static + if ((high < 129) ){ //throw away static (anything < 1 graph) //PrintAndLog("no data found"); return -2; } @@ -283,7 +283,7 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) { uint32_t i; // int invert=0; //invert default - int high = 0, low = 128; + int high = 0, low = 255; *clk=DetectASKClock(BinStream, *size, *clk); //clock default uint8_t BitStream[502] = {0}; @@ -300,7 +300,8 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) else if (BinStream[i] < low) low = BinStream[i]; } - if ((high < 134)){ //throw away static high has to be more than 6 on graph. noise <= -10 here + if ((high < 129)){ //throw away static high has to be more than 0 on graph. + //noise <= -10 here // PrintAndLog("no data found"); return -2; } @@ -410,8 +411,8 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow //uint32_t maxVal=0; if (fchigh==0) fchigh=10; if (fclow==0) fclow=8; - //set the threshold close to 0 (graph) to avoid static - uint8_t threshold_value = 134; //(uint8_t)(((maxVal-128)*.75)+128); + //set the threshold close to 0 (graph) or 128 std to avoid static + uint8_t threshold_value = 123; // sync to first lo-hi transition, and threshold @@ -471,7 +472,7 @@ size_t aggregate_bits(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t maxCons if ( dest[idx-1]==1 ) { n=myround2((float)(n+1)/((float)(rfLen)/(float)fclow)); } else {// 0->1 crossing - n=myround2((float)(n+1)/((float)(rfLen-2)/(float)fchigh)); //-2 for fudge factor + n=myround2((float)(n+1)/((float)(rfLen-1)/(float)fchigh)); //-1 for fudge factor } if (n == 0) n = 1; @@ -563,7 +564,7 @@ uint32_t bytebits_to_byte(uint8_t* src, size_t numbits) int IOdemodFSK(uint8_t *dest, size_t size) { - static const uint8_t THRESHOLD = 134; + static const uint8_t THRESHOLD = 129; uint32_t idx=0; //make sure buffer has data if (size < 66) return -1; @@ -607,7 +608,7 @@ int DetectASKClock(uint8_t dest[], size_t size, int clock) { int i=0; int peak=0; - int low=128; + int low=255; int clk[]={16,32,40,50,64,100,128,256}; int loopCnt = 256; //don't need to loop through entire array... if (size 1280) gLen=1280; // get high @@ -889,7 +889,7 @@ int pskNRZrawDemod(uint8_t *dest, size_t *size, int *clk, int *invert) int lastBit = 0; //set first clock check uint32_t bitnum = 0; //output counter uint8_t tol = 0; //clock tolerance adjust - waves will be accepted as within the clock if they fall + or - this value + clock from last valid wave - if (*clk==32)tol=2; //clock tolerance may not be needed anymore currently set to + or - 1 but could be increased for poor waves or removed entirely + if (*clk==32) tol = 2; //clock tolerance may not be needed anymore currently set to + or - 1 but could be increased for poor waves or removed entirely uint32_t iii = 0; uint8_t errCnt =0; uint32_t bestStart = *size; -- 2.39.5