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lf search use new psk, small demod adjustments

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adjust thresholds for ask, fsk, io, psk based on more sample testing
adjust indala decode to set clock to 32 if no input (autodetect not
always correct)
This commit is contained in:
marshmellow42 2015-01-09 16:46:17 -05:00
commit ac3ba7ee69
3 changed files with 49 additions and 41 deletions
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26
common/lfdemod.c
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@ -300,7 +300,7 @@ int askrawdemod(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 < 134)){ //throw away static high has to be more than 6 on graph. noise <= -10 here
// PrintAndLog("no data found");
return -2;
}
@ -407,21 +407,11 @@ size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow
{
uint32_t last_transition = 0;
uint32_t idx = 1;
uint32_t maxVal=0;
//uint32_t maxVal=0;
if (fchigh==0) fchigh=10;
if (fclow==0) fclow=8;
// we do care about the actual theshold value as sometimes near the center of the
// wave we may get static that changes direction of wave for one value
// if our value is too low it might affect the read. and if our tag or
// antenna is weak a setting too high might not see anything. [marshmellow]
if (size<100) return 0;
for(idx=1; idx<100; idx++){
if(maxVal<dest[idx]) maxVal = dest[idx];
}
// set close to the top of the wave threshold with 25% margin for error
// less likely to get a false transition up there.
// (but have to be careful not to go too high and miss some short waves)
uint8_t threshold_value = (uint8_t)(((maxVal-128)*.75)+128);
//set the threshold close to 0 (graph) to avoid static
uint8_t threshold_value = 134; //(uint8_t)(((maxVal-128)*.75)+128);
// sync to first lo-hi transition, and threshold
@ -573,7 +563,7 @@ uint32_t bytebits_to_byte(uint8_t* src, size_t numbits)
int IOdemodFSK(uint8_t *dest, size_t size)
{
static const uint8_t THRESHOLD = 140;
static const uint8_t THRESHOLD = 134;
uint32_t idx=0;
//make sure buffer has data
if (size < 66) return -1;
@ -707,8 +697,8 @@ int DetectpskNRZClock(uint8_t dest[], size_t size, int clock)
low = dest[i];
}
}
peak=(int)(((peak-128)*.90)+128);
low= (int)(((low-128)*.90)+128);
peak=(int)(((peak-128)*.75)+128);
low= (int)(((low-128)*.75)+128);
//PrintAndLog("DEBUG: peak: %d, low: %d",peak,low);
int ii;
uint8_t clkCnt;
@ -720,7 +710,7 @@ int DetectpskNRZClock(uint8_t dest[], size_t size, int clock)
//test each valid clock from smallest to greatest to see which lines up
for(clkCnt=0; clkCnt < 6; ++clkCnt){
if (clk[clkCnt] == 32){
tol=0;
tol=1;
}else{
tol=0;
}