From: marshmellow42 Date: Mon, 13 Mar 2017 17:27:38 +0000 (-0400) Subject: fixed bug in new refactored detectST X-Git-Tag: v3.0.0~45^2~8 X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/549daaf7784e74a8da886e0c32d947d4128ffa1c?ds=inline fixed bug in new refactored detectST forgot to return i... --- diff --git a/common/lfdemod.c b/common/lfdemod.c index fdcb475b..750dbf1b 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -888,14 +888,14 @@ uint8_t detectFSKClk(uint8_t *BitStream, size_t size, uint8_t fcHigh, uint8_t fc //********************************************************************************************** // look for Sequence Terminator - should be pulses of clk*(1 or 2), clk*2, clk*(1.5 or 2), by idx we mean graph position index... -bool findST(int *stStopLoc, int *stStartIdx, int lowToLowWaveLen[], int highToLowWaveLen[], int clk, int tol, int buffSize, int i) { - for (; i < buffSize - 4; ++i) { - *stStartIdx += lowToLowWaveLen[i]; //caution part of this wave may be data and part may be ST.... to be accounted for in main function for now... - if (lowToLowWaveLen[i] >= clk*1-tol && lowToLowWaveLen[i] <= (clk*2)+tol && highToLowWaveLen[i] < clk+tol) { //1 to 2 clocks depending on 2 bits prior - if (lowToLowWaveLen[i+1] >= clk*2-tol && lowToLowWaveLen[i+1] <= clk*2+tol && highToLowWaveLen[i+1] > clk*3/2-tol) { //2 clocks and wave size is 1 1/2 - if (lowToLowWaveLen[i+2] >= (clk*3)/2-tol && lowToLowWaveLen[i+2] <= clk*2+tol && highToLowWaveLen[i+2] > clk-tol) { //1 1/2 to 2 clocks and at least one full clock wave - if (lowToLowWaveLen[i+3] >= clk*1-tol && lowToLowWaveLen[i+3] <= clk*2+tol) { //1 to 2 clocks for end of ST + first bit - *stStopLoc = i + 3; +bool findST(int *stStopLoc, int *stStartIdx, int lowToLowWaveLen[], int highToLowWaveLen[], int clk, int tol, int buffSize, int *i) { + for (; *i < buffSize - 4; *i+=1) { + *stStartIdx += lowToLowWaveLen[*i]; //caution part of this wave may be data and part may be ST.... to be accounted for in main function for now... + if (lowToLowWaveLen[*i] >= clk*1-tol && lowToLowWaveLen[*i] <= (clk*2)+tol && highToLowWaveLen[*i] < clk+tol) { //1 to 2 clocks depending on 2 bits prior + if (lowToLowWaveLen[*i+1] >= clk*2-tol && lowToLowWaveLen[*i+1] <= clk*2+tol && highToLowWaveLen[*i+1] > clk*3/2-tol) { //2 clocks and wave size is 1 1/2 + if (lowToLowWaveLen[*i+2] >= (clk*3)/2-tol && lowToLowWaveLen[*i+2] <= clk*2+tol && highToLowWaveLen[*i+2] > clk-tol) { //1 1/2 to 2 clocks and at least one full clock wave + if (lowToLowWaveLen[*i+3] >= clk*1-tol && lowToLowWaveLen[*i+3] <= clk*2+tol) { //1 to 2 clocks for end of ST + first bit + *stStopLoc = *i + 3; return true; } } @@ -920,6 +920,7 @@ bool DetectST_ext(uint8_t buffer[], size_t *size, int *foundclock, size_t *ststa int phaseoff = 0; high = low = 128; memset(tmpbuff, 0, sizeof(tmpbuff)); + memset(waveLen, 0, sizeof(waveLen)); if ( getHiLo(buffer, testsize, &high, &low, 80, 80) == -1 ) { if (g_debugMode==2) prnt("DEBUG STT: just noise detected - quitting"); @@ -974,12 +975,12 @@ bool DetectST_ext(uint8_t buffer[], size_t *size, int *foundclock, size_t *ststa *foundclock = clk; i=0; - if (!findST(&start, &skip, tmpbuff, waveLen, clk, tol, j, i)) { + if (!findST(&start, &skip, tmpbuff, waveLen, clk, tol, j, &i)) { // first ST not found - ERROR 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 (g_debugMode==2) prnt("DEBUG STT: first STT found at wave: %i, skip: %i, j=%i", start, skip, j); } if (waveLen[i+2] > clk*1+tol) phaseoff = 0; @@ -992,7 +993,8 @@ bool DetectST_ext(uint8_t buffer[], size_t *size, int *foundclock, size_t *ststa // now do it again to find the end int dummy1 = 0; end = skip; - if (!findST(&dummy1, &end, tmpbuff, waveLen, clk, tol, j, i+3)) { + i+=3; + if (!findST(&dummy1, &end, tmpbuff, waveLen, clk, tol, j, &i)) { //didn't find second ST - ERROR if (g_debugMode==2) prnt("DEBUG STT: second STT not found - quitting"); return false; @@ -1071,6 +1073,30 @@ bool DetectST(uint8_t buffer[], size_t *size, int *foundclock) { return DetectST_ext(buffer, size, foundclock, &ststart, &stend); } +//by marshmellow +//take 11 10 01 11 00 and make 01100 ... miller decoding +//check for phase errors - should never have half a 1 or 0 by itself and should never exceed 1111 or 0000 in a row +//decodes miller encoded binary +//NOTE askrawdemod will NOT demod miller encoded ask unless the clock is manually set to 1/2 what it is detected as! +/*int millerRawDecode(uint8_t *BitStream, size_t *size, int invert) { + if (*size < 16) return -1; + uint16_t MaxBits = 512, errCnt = 0, bestErr = 1000, bestRun = 0; + size_t i, ii, bitCnt=0; + uint8_t alignCnt = 0, curBit = BitStream[0]; + //find alignment, needs 4 1s or 0s to properly align + for (i=1; i < *size; i++) { + alignCnt = (BitStream[i] == curBit) ? alignCnt+1 : 0; + curBit = BitStream[i]; + if (alignCnt == 4) break; + } + // for now error if alignment not found. later add option to run it with multiple offsets... + if (alignCnt != 4) { + if (g_debugMode) prnt("ERROR MillerDecode: alignment not found so either your bitstream is not miller or your data does not have a 101 in it"); + return -1; + } + +}*/ + //by marshmellow //take 01 or 10 = 1 and 11 or 00 = 0 //check for phase errors - should never have 111 or 000 should be 01001011 or 10110100 for 1010