ISO15693 device side improvements (#652)

[proxmark3-svn] / client / cmdhf15.c

diff --git a/client/cmdhf15.c b/client/cmdhf15.c
index 08cc3b154bec50ff3f01baf4dcce1964f3597c01..b6a84c1cf4d196abb5bd73a42431ae3f12361dad 100644 (file)
--- a/client/cmdhf15.c
+++ b/client/cmdhf15.c
@@ -268,7 +268,7 @@ static char* TagErrorStr(uint8_t error) {
                case 0x02: return "The command is not recognised";
                case 0x03: return "The option is not supported.";
                case 0x0f: return "Unknown error.";
-               case 0x10: return "The specified block is not available (doesn’t exist).";
+               case 0x10: return "The specified block is not available (doesn't exist).";
                case 0x11: return "The specified block is already -locked and thus cannot be locked again";
                case 0x12: return "The specified block is locked and its content cannot be changed.";
                case 0x13: return "The specified block was not successfully programmed.";
@@ -286,12 +286,12 @@ int CmdHF15Demod(const char *Cmd)
        int i, j;
        int max = 0, maxPos = 0;
 
-       int skip = 4;
+       int skip = 2;
 
-       if (GraphTraceLen < 1000) return 0;
+       if (GraphTraceLen < 2000) return 0;
 
        // First, correlate for SOF
-       for (i = 0; i < 100; i++) {
+       for (i = 0; i < 200; i++) {
                int corr = 0;
                for (j = 0; j < arraylen(FrameSOF); j += skip) {
                        corr += FrameSOF[j] * GraphBuffer[i + (j / skip)];
@@ -310,23 +310,30 @@ int CmdHF15Demod(const char *Cmd)
        memset(outBuf, 0, sizeof(outBuf));
        uint8_t mask = 0x01;
        for (;;) {
-               int corr0 = 0, corr1 = 0, corrEOF = 0;
-               for (j = 0; j < arraylen(Logic0); j += skip) {
-                       corr0 += Logic0[j] * GraphBuffer[i + (j / skip)];
-               }
-               for (j = 0; j < arraylen(Logic1); j += skip) {
-                       corr1 += Logic1[j] * GraphBuffer[i + (j / skip)];
-               }
-               for (j = 0; j < arraylen(FrameEOF); j += skip) {
-                       corrEOF += FrameEOF[j] * GraphBuffer[i + (j / skip)];
-               }
-               // Even things out by the length of the target waveform.
-               corr0 *= 4;
-               corr1 *= 4;
-               
-               if (corrEOF > corr1 && corrEOF > corr0) {
-                       PrintAndLog("EOF at %d", i);
-                       break;
+                       int corr0 = 0, corr00 = 0, corr01 = 0, corr1 = 0, corrEOF = 0;
+                       for(j = 0; j < arraylen(Logic0); j += skip) {
+                               corr0 += Logic0[j]*GraphBuffer[i+(j/skip)];
+                       }
+                       corr01 = corr00 = corr0;
+                       for(j = 0; j < arraylen(Logic0); j += skip) {
+                               corr00 += Logic0[j]*GraphBuffer[i+arraylen(Logic0)/skip+(j/skip)];
+                               corr01 += Logic1[j]*GraphBuffer[i+arraylen(Logic0)/skip+(j/skip)];
+                       }
+                       for(j = 0; j < arraylen(Logic1); j += skip) {
+                               corr1 += Logic1[j]*GraphBuffer[i+(j/skip)];
+                       }
+                       for(j = 0; j < arraylen(FrameEOF); j += skip) {
+                               corrEOF += FrameEOF[j]*GraphBuffer[i+(j/skip)];
+                       }
+                       // Even things out by the length of the target waveform.
+                       corr00 *= 2;
+                       corr01 *= 2;
+                       corr0 *= 4;
+                       corr1 *= 4;
+       
+                       if(corrEOF > corr1 && corrEOF > corr00 && corrEOF > corr01) {
+                               PrintAndLog("EOF at %d", i);
+                               break;
                } else if (corr1 > corr0) {
                        i += arraylen(Logic1) / skip;
                        outBuf[k] |= mask;