X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/99cf19d9e8b450422f61c467751e8570537ab718..a11ca2f3057416c07ca03b24ff16229f67d1b3f8:/armsrc/lfsampling.c

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index f858dc1c..3a502eb6 100644
--- a/armsrc/lfsampling.c
+++ b/armsrc/lfsampling.c
@@ -17,7 +17,7 @@ sample_config config = { 1, 8, 1, 95, 0 } ;
 
 void printConfig()
 {
-	Dbprintf("Sampling config: ");
+	Dbprintf("LF Sampling config: ");
 	Dbprintf("  [q] divisor:           %d ", config.divisor);
 	Dbprintf("  [b] bps:               %d ", config.bits_per_sample);
 	Dbprintf("  [d] decimation:        %d ", config.decimation);
@@ -40,11 +40,11 @@ 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;
+	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.averaging= sc->averaging;
+	config.averaging = sc->averaging;
 	if(config.bits_per_sample > 8)	config.bits_per_sample = 8;
 	if(config.decimation < 1)	config.decimation = 1;
 
@@ -121,11 +121,11 @@ void LFSetupFPGAForADC(int divisor, bool lf_field)
  */
 uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averaging, int trigger_threshold,bool silent)
 {
-	//.
+	//bigbuf, to hold the aquired raw data signal
 	uint8_t *dest = BigBuf_get_addr();
-    int bufsize = BigBuf_max_traceLen();
+    uint16_t bufsize = BigBuf_max_traceLen();
 
-	memset(dest, 0, bufsize);
+	BigBuf_Clear_ext(false);
 
 	if(bits_per_sample < 1) bits_per_sample = 1;
 	if(bits_per_sample > 8) bits_per_sample = 8;
@@ -141,7 +141,7 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
 	uint32_t sample_total_numbers =0 ;
 	uint32_t sample_total_saved =0 ;
 
-	while(!BUTTON_PRESS()) {
+	while(!BUTTON_PRESS() && !usb_poll_validate_length() ) {
 		WDT_HIT();
 		if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
 			AT91C_BASE_SSC->SSC_THR = 0x43;
@@ -244,8 +244,74 @@ uint32_t SampleLF(bool printCfg)
 * Initializes the FPGA for snoop-mode (field off), and acquires the samples.
 * @return number of bits sampled
 **/
-
-uint32_t SnoopLF()
-{
+uint32_t SnoopLF() {
 	return ReadLF(false, true);
 }
+
+/**
+* acquisition of T55x7 LF signal. Similart to other LF, but adjusted with @marshmellows thresholds
+* the data is collected in BigBuf.
+**/
+void doT55x7Acquisition(size_t sample_size) {
+
+	#define T55xx_READ_UPPER_THRESHOLD 128+60  // 60 grph
+	#define T55xx_READ_LOWER_THRESHOLD 128-60  // -60 grph
+	#define T55xx_READ_TOL   5
+
+	uint8_t *dest = BigBuf_get_addr();
+	uint16_t bufsize = BigBuf_max_traceLen();
+	
+	if ( bufsize > sample_size )
+		bufsize = sample_size;
+
+	uint16_t i = 0;
+	bool startFound = false;
+	bool highFound = false;
+	bool lowFound = false;
+	uint8_t curSample = 0;
+	uint8_t lastSample = 0;
+	uint16_t skipCnt = 0;
+	while(!BUTTON_PRESS() && !usb_poll_validate_length() && skipCnt < 1000 && (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) {
+			curSample = (uint8_t)AT91C_BASE_SSC->SSC_RHR;	
+			LED_D_OFF();
+		
+			// skip until the first high sample above threshold
+			if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
+				//if (curSample > lastSample) 
+				//	lastSample = curSample;
+				highFound = true;
+			} else if (!highFound) {
+				skipCnt++;
+				continue;
+			}
+			// skip until the first Low sample below threshold
+			if (!startFound && curSample < T55xx_READ_LOWER_THRESHOLD) {
+				//if (curSample > lastSample) 
+				lastSample = curSample;
+				lowFound = true;
+			} else if (!lowFound) {
+				skipCnt++;
+				continue;
+			}
+
+
+			// skip until first high samples begin to change
+			if (startFound || curSample > T55xx_READ_LOWER_THRESHOLD+T55xx_READ_TOL){
+				// if just found start - recover last sample
+				if (!startFound) {
+					dest[i++] = lastSample;
+					startFound = true;
+				}
+				// collect samples
+				dest[i++] = curSample;
+			}
+		}
+	}
+}
+			
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