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Some documentation and formatting to LogTraceHitag

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This commit is contained in:
Martin Holst Swende 2015-02-07 21:05:14 +01:00
commit 665775c844
2 changed files with 19 additions and 8 deletions
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25
armsrc/BigBuf.c
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@ -185,27 +185,38 @@ bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_
}
int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int bReader)
{
static uint16_t traceLen = 0;
if (!tracing) return FALSE;
uint8_t *trace = BigBuf_get_addr();
uint16_t iLen = nbytes(iBits);
// Return when trace is full
if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + nbytes(iBits) > BigBuf_max_traceLen()) return FALSE;
if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return FALSE;
//Hitag traces appear to use this traceformat:
// 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
// 32 bits parity
// 8 bits size (number of bits in the trace entry)
// y Bytes data
// Trace the random, i'm curious
rsamples += iSamples;
trace[traceLen++] = ((rsamples >> 0) & 0xff);
trace[traceLen++] = ((rsamples >> 8) & 0xff);
trace[traceLen++] = ((rsamples >> 16) & 0xff);
trace[traceLen++] = ((rsamples >> 24) & 0xff);
if (!bReader) {
trace[traceLen - 1] |= 0x80;
trace[traceLen - 1] |= 0x80;
}
trace[traceLen++] = ((dwParity >> 0) & 0xff);
trace[traceLen++] = ((dwParity >> 8) & 0xff);
trace[traceLen++] = ((dwParity >> 16) & 0xff);
trace[traceLen++] = ((dwParity >> 24) & 0xff);
trace[traceLen++] = iBits;
memcpy(trace + traceLen, btBytes, nbytes(iBits));
traceLen += nbytes(iBits);
memcpy(trace + traceLen, btBytes, iLen);
traceLen += iLen;
return TRUE;
}

2
armsrc/util.c
View file

@ -35,7 +35,7 @@ void print_result(char *name, uint8_t *buf, size_t len) {
}
size_t nbytes(size_t nbits) {
return (nbits/8)+((nbits%8)>0);
return (nbits >> 3)+((nbits % 8) > 0);
}
uint32_t SwapBits(uint32_t value, int nrbits) {