//**********************************************************************************************
//---------------------------------Utilities Section--------------------------------------------
//**********************************************************************************************
-
+#define LOWEST_DEFAULT_CLOCK 32
//to allow debug print calls when used not on device
void dummy(char *fmt, ...){}
#ifndef ON_DEVICE
return i;
}
-void getNextLow(uint8_t samples[], size_t size, int low, int *i) {
+int getClosestClock(int testclk) {
+ uint8_t fndClk[] = {8,16,32,40,50,64,128};
+
+ for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++)
+ if (testclk >= fndClk[clkCnt]-(fndClk[clkCnt]/8) && testclk <= fndClk[clkCnt]+1)
+ return fndClk[clkCnt];
+
+ return 0;
+}
+
+void getNextLow(uint8_t samples[], size_t size, int low, size_t *i) {
while ((samples[*i] > low) && (*i < size))
*i+=1;
}
-void getNextHigh(uint8_t samples[], size_t size, int high, int *i) {
+void getNextHigh(uint8_t samples[], size_t size, int high, size_t *i) {
while ((samples[*i] < high) && (*i < size))
*i+=1;
}
// load wave counters
bool loadWaveCounters(uint8_t samples[], size_t size, int lowToLowWaveLen[], int highToLowWaveLen[], int *waveCnt, int *skip, int *minClk, int *high, int *low) {
- int i=0, start, waveStart;
+ size_t i=0, firstLow, firstHigh;
size_t testsize = (size < 512) ? size : 512;
if ( getHiLo(samples, testsize, high, low, 80, 80) == -1 ) {
// populate tmpbuff buffer with pulse lengths
while (i < size) {
// measure from low to low
- getNextLow(samples, size, *low, &i);
- start = i;
-
+ firstLow = i;
//find first high point for this wave
getNextHigh(samples, size, *high, &i);
- waveStart = i;
+ firstHigh = i;
getNextLow(samples, size, *low, &i);
- if (*waveCnt >= (size/32))
+ if (*waveCnt >= (size/LOWEST_DEFAULT_CLOCK))
break;
- highToLowWaveLen[*waveCnt] = i - waveStart; //first high to first low
- lowToLowWaveLen[*waveCnt] = i - start;
+ highToLowWaveLen[*waveCnt] = i - firstHigh; //first high to first low
+ lowToLowWaveLen[*waveCnt] = i - firstLow;
*waveCnt += 1;
- if (i-start < *minClk && i < size) {
- *minClk = i - start;
+ if (i-firstLow < *minClk && i < size) {
+ *minClk = i - firstLow;
}
}
return true;
// by marshmellow
// to help detect clocks on heavily clipped samples
// based on count of low to low
-int DetectStrongAskClock(uint8_t dest[], size_t size, uint8_t high, uint8_t low, int *clock) {
- uint8_t fndClk[] = {8,16,32,40,50,64,128};
+int DetectStrongAskClock(uint8_t dest[], size_t size, int high, int low, int *clock) {
size_t startwave;
size_t i = 100;
size_t minClk = 255;
int shortestWaveIdx = 0;
// get to first full low to prime loop and skip incomplete first pulse
- while ((dest[i] < high) && (i < size))
- ++i;
- while ((dest[i] > low) && (i < size))
- ++i;
+ getNextHigh(dest, size, high, &i);
+ getNextLow(dest, size, low, &i);
// loop through all samples
while (i < size) {
// measure from low to low
- while ((dest[i] > low) && (i < size))
- ++i;
startwave = i;
- while ((dest[i] < high) && (i < size))
- ++i;
- while ((dest[i] > low) && (i < size))
- ++i;
+
+ getNextHigh(dest, size, high, &i);
+ getNextLow(dest, size, low, &i);
//get minimum measured distance
if (i-startwave < minClk && i < size) {
minClk = i - startwave;
}
}
// set clock
- if (g_debugMode==2) prnt("DEBUG ASK: detectstrongASKclk smallest wave: %d",minClk);
- for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++) {
- if (minClk >= fndClk[clkCnt]-(fndClk[clkCnt]/8) && minClk <= fndClk[clkCnt]+1) {
- *clock = fndClk[clkCnt];
- return shortestWaveIdx;
- }
- }
- return 0;
+ if (g_debugMode==2) prnt("DEBUG ASK: DetectStrongAskClock smallest wave: %d",minClk);
+ *clock = getClosestClock(minClk);
+ if (*clock == 0)
+ return 0;
+
+ return shortestWaveIdx;
}
// by marshmellow
//**********************************************************************************************
// 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) {
+bool findST(int *stStopLoc, int *stStartIdx, int lowToLowWaveLen[], int highToLowWaveLen[], int clk, int tol, int buffSize, size_t *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
bool DetectST_ext(uint8_t buffer[], size_t *size, int *foundclock, size_t *ststart, size_t *stend) {
size_t bufsize = *size;
//need to loop through all samples and identify our clock, look for the ST pattern
- uint8_t fndClk[] = {8,16,32,40,50,64,128};
int clk = 0;
int tol = 0;
- int i=0, j, skip, start, end, low, high, minClk=255;
+ int j, high, low, skip, start, end, minClk=255;
+ size_t i = 0;
//probably should malloc... || test if memory is available ... handle device side? memory danger!!! [marshmellow]
- int tmpbuff[bufsize / 32]; // low to low wave count //guess rf/32 clock, if click is smaller we will only have room for a fraction of the samples captured
- int waveLen[bufsize / 32]; // high to low wave count //if clock is larger then we waste memory in array size that is not needed...
+ int tmpbuff[bufsize / LOWEST_DEFAULT_CLOCK]; // low to low wave count //guess rf/32 clock, if click is smaller we will only have room for a fraction of the samples captured
+ int waveLen[bufsize / LOWEST_DEFAULT_CLOCK]; // high to low wave count //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;
if (!loadWaveCounters(buffer, bufsize, tmpbuff, waveLen, &j, &skip, &minClk, &high, &low)) return false;
// set clock - might be able to get this externally and remove this work...
- if (!clk) {
- for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++) {
- tol = fndClk[clkCnt]/8;
- if (minClk >= fndClk[clkCnt]-tol && minClk <= fndClk[clkCnt]+1) {
- clk=fndClk[clkCnt];
- break;
- }
- }
- // clock not found - ERROR
- if (!clk) {
- if (g_debugMode==2) prnt("DEBUG STT: clock not found - quitting");
- return false;
- }
- } else tol = clk/8;
-
+ clk = getClosestClock(minClk);
+ // clock not found - ERROR
+ if (clk == 0) {
+ if (g_debugMode==2) prnt("DEBUG STT: clock not found - quitting");
+ return false;
+ }
*foundclock = clk;
+
+ tol = clk/8;
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");
projects / proxmark3-svn / commitdiff