X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/edaf10af99156022f7719c6853812005579c8726..dc3a58466d5118dde8bcd1978d44dd9c64774f26:/armsrc/lfsampling.c?ds=sidebyside

diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c
index 6eecf407..94ddc727 100644
--- a/armsrc/lfsampling.c
+++ b/armsrc/lfsampling.c
@@ -6,17 +6,11 @@
 // Miscellaneous routines for low frequency sampling.
 //-----------------------------------------------------------------------------
 
-#include "proxmark3.h"
-#include "apps.h"
-#include "util.h"
-#include "string.h"
-
 #include "lfsampling.h"
 
 sample_config config = { 1, 8, 1, 95, 0 } ;
 
-void printConfig()
-{
+void printConfig() {
 	Dbprintf("LF Sampling config: ");
 	Dbprintf("  [q] divisor:           %d ", config.divisor);
 	Dbprintf("  [b] bps:               %d ", config.bits_per_sample);
@@ -37,22 +31,20 @@ void printConfig()
  * @brief setSamplingConfig
  * @param sc
  */
-void setSamplingConfig(sample_config *sc)
-{
+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;
 
 	printConfig();
 }
 
-sample_config* getSamplingConfig()
-{
+sample_config* getSamplingConfig() {
 	return &config;
 }
 
@@ -67,8 +59,7 @@ typedef struct {
  * @param stream
  * @param bit
  */
-void pushBit( BitstreamOut* stream, uint8_t bit)
-{
+void pushBit( BitstreamOut* stream, uint8_t bit) {
 	int bytepos = stream->position >> 3; // divide by 8
 	int bitpos = stream->position & 7;
 	*(stream->buffer+bytepos) |= (bit > 0) <<  (7 - bitpos);
@@ -83,8 +74,7 @@ void pushBit( BitstreamOut* stream, uint8_t bit)
 * 				   0 or 95 ==> 125 KHz
 *
 **/
-void LFSetupFPGAForADC(int divisor, bool lf_field)
-{
+void LFSetupFPGAForADC(int divisor, bool lf_field) {
 	FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
 	if ( (divisor == 1) || (divisor < 0) || (divisor > 255) )
 		FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz
@@ -97,13 +87,14 @@ void LFSetupFPGAForADC(int divisor, bool lf_field)
 
 	// Connect the A/D to the peak-detected low-frequency path.
 	SetAdcMuxFor(GPIO_MUXSEL_LOPKD);
-	// Give it a bit of time for the resonant antenna to settle.
+	// 50ms for the resonant antenna to settle.
 	SpinDelay(50);
 	// Now set up the SSC to get the ADC samples that are now streaming at us.
 	FpgaSetupSsc();
+	// start a 1.5ticks is 1us
+	StartTicks();
 }
 
-
 /**
  * Does the sample acquisition. If threshold is specified, the actual sampling
  * is not commenced until the threshold has been reached.
@@ -119,13 +110,12 @@ void LFSetupFPGAForADC(int divisor, bool lf_field)
  * @param silent - is true, now outputs are made. If false, dbprints the status
  * @return the number of bits occupied by the samples.
  */
-uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averaging, int trigger_threshold,bool silent)
-{
+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();
     uint16_t bufsize = BigBuf_max_traceLen();
 
-	BigBuf_Clear_ext(false);
+	//BigBuf_Clear_ext(false);	  //creates issues with cmdread (marshmellow)
 
 	if(bits_per_sample < 1) bits_per_sample = 1;
 	if(bits_per_sample > 8) bits_per_sample = 8;
@@ -211,12 +201,10 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag
  * @param silent
  * @return number of bits sampled
  */
-uint32_t DoAcquisition_default(int trigger_threshold, bool silent)
-{
+uint32_t DoAcquisition_default(int trigger_threshold, bool silent) {
 	return DoAcquisition(1,8,0,trigger_threshold,silent);
 }
-uint32_t DoAcquisition_config( bool silent)
-{
+uint32_t DoAcquisition_config( bool silent) {
 	return DoAcquisition(config.decimation
 				  ,config.bits_per_sample
 				  ,config.averaging
@@ -224,11 +212,10 @@ uint32_t DoAcquisition_config( bool silent)
 				  ,silent);
 }
 
-uint32_t ReadLF(bool activeField, bool silent)
-{
-	if (!silent) printConfig();
+uint32_t ReadLF(bool activeField, bool silent) {
+	if (!silent)
+		printConfig();
 	LFSetupFPGAForADC(config.divisor, activeField);
-	// Now call the acquisition routine
 	return DoAcquisition_config(silent);
 }
 
@@ -236,8 +223,7 @@ uint32_t ReadLF(bool activeField, bool silent)
 * Initializes the FPGA for reader-mode (field on), and acquires the samples.
 * @return number of bits sampled
 **/
-uint32_t SampleLF(bool printCfg)
-{
+uint32_t SampleLF(bool printCfg) {
 	return ReadLF(true, printCfg);
 }
 /**
@@ -254,22 +240,23 @@ uint32_t SnoopLF() {
 **/
 void doT55x7Acquisition(size_t sample_size) {
 
-	#define T55xx_READ_UPPER_THRESHOLD 128+40  // 40 grph
-	#define T55xx_READ_TOL   5
-
+	#define T55xx_READ_UPPER_THRESHOLD 128+40  // 60 grph
+	#define T55xx_READ_LOWER_THRESHOLD 128-40  // -60 grph
+	#define T55xx_READ_TOL   2
+	
 	uint8_t *dest = BigBuf_get_addr();
 	uint16_t bufsize = BigBuf_max_traceLen();
 	
 	if ( bufsize > sample_size )
 		bufsize = sample_size;
 
-	uint16_t i = 0;
+	uint8_t curSample = 0, lastSample = 0;
+	uint16_t i = 0, skipCnt = 0;
 	bool startFound = false;
 	bool highFound = false;
-	uint8_t curSample = 0;
-	uint8_t firstSample = 0;
-	uint16_t skipCnt = 0;
-	while(!BUTTON_PRESS() && !usb_poll_validate_length() && skipCnt<1000) {
+	bool lowFound = false;
+		
+	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;
@@ -281,24 +268,32 @@ void doT55x7Acquisition(size_t sample_size) {
 		
 			// skip until the first high sample above threshold
 			if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) {
-				if (curSample > firstSample) 
-					firstSample = curSample;
+				//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 < firstSample-T55xx_READ_TOL){
+			if (startFound || curSample > T55xx_READ_LOWER_THRESHOLD + T55xx_READ_TOL){
 				// if just found start - recover last sample
 				if (!startFound) {
-					dest[i++] = firstSample;
-				startFound = true;
+					dest[i++] = lastSample;
+					startFound = true;
 				}
 				// collect samples
 				dest[i++] = curSample;
-				if (i >= bufsize-1) break;
 			}
 		}
 	}