X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/b828a4e16818697605d57f2600cbb815c5ce5e7e..c930078036cfdf38ca1c922c0d1841722c48a611:/armsrc/lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index d726ba20..def7431d 100644
--- a/armsrc/lfsampling.c
+++ b/armsrc/lfsampling.c
@@ -8,18 +8,25 @@
 
 #include "lfsampling.h"
 
+/*
+Default LF config is set to:
+	decimation = 1  (we keep 1 out of 1 samples)
+	bits_per_sample = 8
+	averaging = YES
+	divisor = 95 (125khz)
+	trigger_threshold = 0
+	*/
 sample_config config = { 1, 8, 1, 95, 0 } ;
 
 void printConfig() {
 	Dbprintf("LF Sampling config: ");
-	Dbprintf("  [q] divisor:           %d ", config.divisor);
+	Dbprintf("  [q] divisor:           %d (%d KHz)", config.divisor, 12000 / (config.divisor+1));
 	Dbprintf("  [b] bps:               %d ", config.bits_per_sample);
 	Dbprintf("  [d] decimation:        %d ", config.decimation);
-	Dbprintf("  [a] averaging:         %d ", config.averaging);
+	Dbprintf("  [a] averaging:         %s ", (config.averaging) ? "Yes" : "No");
 	Dbprintf("  [t] trigger threshold: %d ", config.trigger_threshold);
 }
 
-
 /**
  * Called from the USB-handler to set the sampling configuration
  * The sampling config is used for std reading and snooping.
@@ -34,12 +41,11 @@ void printConfig() {
 void setSamplingConfig(sample_config *sc) {
 	if(sc->divisor != 0) config.divisor = sc->divisor;
 	if(sc->bits_per_sample != 0) config.bits_per_sample = sc->bits_per_sample;
-	if(sc->decimation != 0) config.decimation = sc->decimation;
 	if(sc->trigger_threshold != -1) config.trigger_threshold = sc->trigger_threshold;
-
+	
+	config.decimation = (sc->decimation != 0) ? sc->decimation : 1;
 	config.averaging = sc->averaging;
 	if(config.bits_per_sample > 8)	config.bits_per_sample = 8;
-	if(config.decimation < 1)	config.decimation = 1;
 
 	printConfig();
 }
@@ -304,4 +310,122 @@ void doT55x7Acquisition(size_t sample_size) {
 		}
 	}
 }
-			
\ No newline at end of file
+/**
+* acquisition of Cotag LF signal. Similart to other LF,  since the Cotag has such long datarate RF/384
+* and is Manchester?,  we directly gather the manchester data into bigbuff
+**/
+
+#define COTAG_T1 384
+#define COTAG_T2 (COTAG_T1>>1)
+#define COTAG_ONE_THRESHOLD 128+30
+#define COTAG_ZERO_THRESHOLD 128-30
+void doCotagAcquisition(size_t sample_size) {
+
+	uint8_t *dest = BigBuf_get_addr();
+	uint16_t bufsize = BigBuf_max_traceLen();
+	
+	if ( bufsize > sample_size )
+		bufsize = sample_size;
+
+	dest[0] = 0;	
+	uint8_t sample = 0, firsthigh = 0, firstlow = 0; 
+	uint16_t i = 0;
+
+	while (!BUTTON_PRESS() && !usb_poll_validate_length() && (i < bufsize) ) {
+		WDT_HIT();		
+		if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
+			AT91C_BASE_SSC->SSC_THR = 0x43;
+			LED_D_ON();
+		}
+		
+		if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
+			sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;	
+			LED_D_OFF();
+		
+			// find first peak
+			if ( !firsthigh ) {
+				if (sample < COTAG_ONE_THRESHOLD) 
+					continue;
+				firsthigh = 1;
+			}
+			if ( !firstlow ){
+				if (sample > COTAG_ZERO_THRESHOLD )
+					continue;
+				firstlow = 1;
+			}
+
+			++i;			
+	
+			if ( sample > COTAG_ONE_THRESHOLD)
+				dest[i] = 255;
+			else if ( sample < COTAG_ZERO_THRESHOLD) 
+				dest[i] = 0;
+			else 
+				dest[i] = dest[i-1];			
+		}
+	}
+}
+
+uint32_t doCotagAcquisitionManchester() {
+
+	uint8_t *dest = BigBuf_get_addr();
+	uint16_t bufsize = BigBuf_max_traceLen();
+	
+	if ( bufsize > COTAG_BITS )
+		bufsize = COTAG_BITS;
+
+	dest[0] = 0;	
+	uint8_t sample = 0, firsthigh = 0, firstlow = 0; 
+	uint16_t sample_counter = 0, period = 0;
+	uint8_t curr = 0, prev = 0;
+
+	while (!BUTTON_PRESS() && !usb_poll_validate_length() && (sample_counter < bufsize) ) {
+		WDT_HIT();		
+		if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
+			AT91C_BASE_SSC->SSC_THR = 0x43;
+			LED_D_ON();
+		}
+		
+		if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {
+			sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;	
+			LED_D_OFF();
+		
+			// find first peak
+			if ( !firsthigh ) {
+				if (sample < COTAG_ONE_THRESHOLD) 
+					continue;
+				firsthigh = 1;
+			}
+			
+			if ( !firstlow ){
+				if (sample > COTAG_ZERO_THRESHOLD )
+					continue;
+				firstlow = 1;
+			}
+						
+			// set sample 255, 0,  or previous			
+			if ( sample > COTAG_ONE_THRESHOLD){
+				prev = curr;
+				curr = 1;
+			}
+			else if ( sample < COTAG_ZERO_THRESHOLD) {
+				prev = curr;
+				curr = 0;
+			}
+			else {
+				curr = prev;
+			}			
+
+			// full T1 periods, 
+			if ( period > 0 ) {
+				--period;
+				continue;
+			}
+						
+			dest[sample_counter] = curr;
+			++sample_counter;
+			period = COTAG_T1;
+		}
+	}
+	return sample_counter;
+}
\ No newline at end of file