X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/9e8255d4e99eb2917df13be92402e75a73417696..27eabcdccb0179e8ab003e496a46fb1621f08701:/armsrc/appmain.c?ds=inline

diff --git a/armsrc/appmain.c b/armsrc/appmain.c
index bca31533..3da34777 100644
--- a/armsrc/appmain.c
+++ b/armsrc/appmain.c
@@ -23,7 +23,8 @@
 
 #include "legicrf.h"
 #include <hitag2.h>
-
+#include "lfsampling.h"
+#include "BigBuf.h"
 #ifdef WITH_LCD
  #include "LCD.h"
 #endif
@@ -42,12 +43,6 @@ int ToSendMax;
 static int ToSendBit;
 struct common_area common_area __attribute__((section(".commonarea")));
 
-void BufferClear(void)
-{
-	memset(BigBuf,0,sizeof(BigBuf));
-	Dbprintf("Buffer cleared (%i bytes)",sizeof(BigBuf));
-}
-
 void ToSendReset(void)
 {
 	ToSendMax = -1;
@@ -141,12 +136,25 @@ static int ReadAdc(int ch)
 
 	AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST;
 	AT91C_BASE_ADC->ADC_MR =
-		ADC_MODE_PRESCALE(32) |
-		ADC_MODE_STARTUP_TIME(16) |
-		ADC_MODE_SAMPLE_HOLD_TIME(8);
+		ADC_MODE_PRESCALE(63  /* was 32 */) |							// ADC_CLK = MCK / ((63+1) * 2) = 48MHz / 128 = 375kHz
+		ADC_MODE_STARTUP_TIME(1  /* was 16 */) |						// Startup Time = (1+1) * 8 / ADC_CLK = 16 / 375kHz = 42,7us     Note: must be > 20us
+		ADC_MODE_SAMPLE_HOLD_TIME(15  /* was 8 */); 					// Sample & Hold Time SHTIM = 15 / ADC_CLK = 15 / 375kHz = 40us
+
+	// Note: ADC_MODE_PRESCALE and ADC_MODE_SAMPLE_HOLD_TIME are set to the maximum allowed value. 
+	// Both AMPL_LO and AMPL_HI are very high impedance (10MOhm) outputs, the input capacitance of the ADC is 12pF (typical). This results in a time constant
+	// of RC = 10MOhm * 12pF = 120us. Even after the maximum configurable sample&hold time of 40us the input capacitor will not be fully charged. 
+	// 
+	// The maths are:
+	// If there is a voltage v_in at the input, the voltage v_cap at the capacitor (this is what we are measuring) will be
+	//
+	//       v_cap = v_in * (1 - exp(-RC/SHTIM))  =   v_in * (1 - exp(-3))  =  v_in * 0,95                   (i.e. an error of 5%)
+	// 
+	// Note: with the "historic" values in the comments above, the error was 34%  !!!
+	
 	AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ch);
 
 	AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
+
 	while(!(AT91C_BASE_ADC->ADC_SR & ADC_END_OF_CONVERSION(ch)))
 		;
 	d = AT91C_BASE_ADC->ADC_CDR[ch];
@@ -189,9 +197,7 @@ void MeasureAntennaTuning(void)
     WDT_HIT();
 		FpgaSendCommand(FPGA_CMD_SET_DIVISOR, i);
 		SpinDelay(20);
-		// Vref = 3.3V, and a 10000:240 voltage divider on the input
-		// can measure voltages up to 137500 mV
-		adcval = ((137500 * AvgAdc(ADC_CHAN_LF)) >> 10);
+		adcval = ((MAX_ADC_LF_VOLTAGE * AvgAdc(ADC_CHAN_LF)) >> 10);
 		if (i==95) 	vLf125 = adcval; // voltage at 125Khz
 		if (i==89) 	vLf134 = adcval; // voltage at 134Khz
 
@@ -211,11 +217,9 @@ void MeasureAntennaTuning(void)
   	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
 	SpinDelay(20);
-	// Vref = 3300mV, and an 10:1 voltage divider on the input
-	// can measure voltages up to 33000 mV
-	vHf = (33000 * AvgAdc(ADC_CHAN_HF)) >> 10;
+	vHf = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10;
 
-	cmd_send(CMD_MEASURED_ANTENNA_TUNING,vLf125|(vLf134<<16),vHf,peakf|(peakv<<16),LF_Results,256);
+	cmd_send(CMD_MEASURED_ANTENNA_TUNING, vLf125 | (vLf134<<16), vHf, peakf | (peakv<<16), LF_Results, 256);
 	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
 	LED_A_OFF();
 	LED_B_OFF();
@@ -228,25 +232,30 @@ void MeasureAntennaTuningHf(void)
 
 	DbpString("Measuring HF antenna, press button to exit");
 
+	// Let the FPGA drive the high-frequency antenna around 13.56 MHz.
+	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
+
 	for (;;) {
-		// Let the FPGA drive the high-frequency antenna around 13.56 MHz.
-		FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
-		FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR);
 		SpinDelay(20);
-		// Vref = 3300mV, and an 10:1 voltage divider on the input
-		// can measure voltages up to 33000 mV
-		vHf = (33000 * AvgAdc(ADC_CHAN_HF)) >> 10;
+		vHf = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10;
 
 		Dbprintf("%d mV",vHf);
 		if (BUTTON_PRESS()) break;
 	}
 	DbpString("cancelled");
+
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+
 }
 
 
 void SimulateTagHfListen(void)
 {
-	uint8_t *dest = (uint8_t *)BigBuf+FREE_BUFFER_OFFSET;
+	// ToDo: historically this used the free buffer, which was 2744 Bytes long. 
+	// There might be a better size to be defined:
+	#define HF_14B_SNOOP_BUFFER_SIZE 2744
+	uint8_t *dest = BigBuf_malloc(HF_14B_SNOOP_BUFFER_SIZE);
 	uint8_t v = 0;
 	int i;
 	int p = 0;
@@ -281,7 +290,7 @@ void SimulateTagHfListen(void)
 				p = 0;
 				i++;
 
-				if(i >= FREE_BUFFER_SIZE) {
+				if(i >= HF_14B_SNOOP_BUFFER_SIZE) {
 					break;
 				}
 			}
@@ -515,26 +524,32 @@ static const int LIGHT_LEN = sizeof(LIGHT_SCHEME)/sizeof(LIGHT_SCHEME[0]);
 
 void ListenReaderField(int limit)
 {
-	int lf_av, lf_av_new, lf_baseline= 0, lf_count= 0, lf_max;
-	int hf_av, hf_av_new,  hf_baseline= 0, hf_count= 0, hf_max;
+	int lf_av, lf_av_new, lf_baseline= 0, lf_max;
+	int hf_av, hf_av_new,  hf_baseline= 0, hf_max;
 	int mode=1, display_val, display_max, i;
 
-#define LF_ONLY		1
-#define HF_ONLY		2
+#define LF_ONLY						1
+#define HF_ONLY						2
+#define REPORT_CHANGE			 	10    // report new values only if they have changed at least by REPORT_CHANGE
+
+
+	// switch off FPGA - we don't want to measure our own signal
+	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
 
 	LEDsoff();
 
-	lf_av=lf_max=ReadAdc(ADC_CHAN_LF);
+	lf_av = lf_max = AvgAdc(ADC_CHAN_LF);
 
 	if(limit != HF_ONLY) {
-		Dbprintf("LF 125/134 Baseline: %d", lf_av);
+		Dbprintf("LF 125/134kHz Baseline: %dmV", (MAX_ADC_LF_VOLTAGE * lf_av) >> 10);
 		lf_baseline = lf_av;
 	}
 
-	hf_av=hf_max=ReadAdc(ADC_CHAN_HF);
+	hf_av = hf_max = AvgAdc(ADC_CHAN_HF);
 
 	if (limit != LF_ONLY) {
-		Dbprintf("HF 13.56 Baseline: %d", hf_av);
+		Dbprintf("HF 13.56MHz Baseline: %dmV", (MAX_ADC_HF_VOLTAGE * hf_av) >> 10);
 		hf_baseline = hf_av;
 	}
 
@@ -557,38 +572,38 @@ void ListenReaderField(int limit)
 		WDT_HIT();
 
 		if (limit != HF_ONLY) {
-			if(mode==1) {
-				if (abs(lf_av - lf_baseline) > 10) LED_D_ON();
-				else                               LED_D_OFF();
+			if(mode == 1) {
+				if (abs(lf_av - lf_baseline) > REPORT_CHANGE) 
+					LED_D_ON();
+				else
+					LED_D_OFF();
 			}
 
-			++lf_count;
-			lf_av_new= ReadAdc(ADC_CHAN_LF);
+			lf_av_new = AvgAdc(ADC_CHAN_LF);
 			// see if there's a significant change
-			if(abs(lf_av - lf_av_new) > 10) {
-				Dbprintf("LF 125/134 Field Change: %x %x %x", lf_av, lf_av_new, lf_count);
+			if(abs(lf_av - lf_av_new) > REPORT_CHANGE) {
+				Dbprintf("LF 125/134kHz Field Change: %5dmV", (MAX_ADC_LF_VOLTAGE * lf_av_new) >> 10);
 				lf_av = lf_av_new;
 				if (lf_av > lf_max)
 					lf_max = lf_av;
-				lf_count= 0;
 			}
 		}
 
 		if (limit != LF_ONLY) {
 			if (mode == 1){
-				if (abs(hf_av - hf_baseline) > 10) LED_B_ON();
-				else                               LED_B_OFF();
+				if (abs(hf_av - hf_baseline) > REPORT_CHANGE) 	
+					LED_B_ON();
+				else
+					LED_B_OFF();
 			}
 
-			++hf_count;
-			hf_av_new= ReadAdc(ADC_CHAN_HF);
+			hf_av_new = AvgAdc(ADC_CHAN_HF);
 			// see if there's a significant change
-			if(abs(hf_av - hf_av_new) > 10) {
-				Dbprintf("HF 13.56 Field Change: %x %x %x", hf_av, hf_av_new, hf_count);
+			if(abs(hf_av - hf_av_new) > REPORT_CHANGE) {
+				Dbprintf("HF 13.56MHz Field Change: %5dmV", (MAX_ADC_HF_VOLTAGE * hf_av_new) >> 10);
 				hf_av = hf_av_new;
 				if (hf_av > hf_max)
 					hf_max = hf_av;
-				hf_count= 0;
 			}
 		}
 
@@ -629,16 +644,17 @@ void UsbPacketReceived(uint8_t *packet, int len)
   
 	switch(c->cmd) {
 #ifdef WITH_LF
+		case CMD_SET_LF_SAMPLING_CONFIG:
+			setSamplingConfig((sample_config *) c->d.asBytes);
+			break;
 		case CMD_ACQUIRE_RAW_ADC_SAMPLES_125K:
-			AcquireRawAdcSamples125k(c->arg[0]);
-			cmd_send(CMD_ACK,0,0,0,0,0);
+			cmd_send(CMD_ACK,SampleLF(),0,0,0,0);
 			break;
 		case CMD_MOD_THEN_ACQUIRE_RAW_ADC_SAMPLES_125K:
 			ModThenAcquireRawAdcSamples125k(c->arg[0],c->arg[1],c->arg[2],c->d.asBytes);
 			break;
 		case CMD_LF_SNOOP_RAW_ADC_SAMPLES:
-			SnoopLFRawAdcSamples(c->arg[0], c->arg[1]);
-			cmd_send(CMD_ACK,0,0,0,0,0);
+			cmd_send(CMD_ACK,SnoopLF(),0,0,0,0);
 			break;
 		case CMD_HID_DEMOD_FSK:
 			CmdHIDdemodFSK(c->arg[0], 0, 0, 1);
@@ -801,9 +817,18 @@ void UsbPacketReceived(uint8_t *packet, int len)
 		case CMD_MIFAREU_READBL:
 			MifareUReadBlock(c->arg[0],c->d.asBytes);
 			break;
+		case CMD_MIFAREUC_AUTH1:
+			MifareUC_Auth1(c->arg[0],c->d.asBytes);
+			break;
+		case CMD_MIFAREUC_AUTH2:
+			MifareUC_Auth2(c->arg[0],c->d.asBytes);
+			break;
 		case CMD_MIFAREU_READCARD:
 			MifareUReadCard(c->arg[0], c->arg[1], c->d.asBytes);
-                        break;
+			break;
+		case CMD_MIFAREUC_READCARD:
+			MifareUReadCard(c->arg[0], c->arg[1], c->d.asBytes);
+			break;
 		case CMD_MIFARE_READSC:
 			MifareReadSector(c->arg[0], c->arg[1], c->arg[2], c->d.asBytes);
 			break;
@@ -858,6 +883,7 @@ void UsbPacketReceived(uint8_t *packet, int len)
 		case CMD_MIFARE_SNIFFER:
 			SniffMifare(c->arg[0]);
 			break;
+
 #endif
 
 #ifdef WITH_ICLASS
@@ -874,6 +900,9 @@ void UsbPacketReceived(uint8_t *packet, int len)
 		case CMD_READER_ICLASS_REPLAY:
 		    ReaderIClass_Replay(c->arg[0], c->d.asBytes);
 			break;
+	case CMD_ICLASS_EML_MEMSET:
+			emlSet(c->d.asBytes,c->arg[0], c->arg[1]);
+			break;
 #endif
 
 		case CMD_SIMULATE_TAG_HF_LISTEN:
@@ -881,7 +910,7 @@ void UsbPacketReceived(uint8_t *packet, int len)
 			break;
 
 		case CMD_BUFF_CLEAR:
-			BufferClear();
+			BigBuf_Clear();
 			break;
 
 		case CMD_MEASURE_ANTENNA_TUNING:
@@ -905,17 +934,18 @@ void UsbPacketReceived(uint8_t *packet, int len)
 		case CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K:
 
 			LED_B_ON();
+			uint8_t *BigBuf = BigBuf_get_addr();
 			for(size_t i=0; i<c->arg[1]; i += USB_CMD_DATA_SIZE) {
 				size_t len = MIN((c->arg[1] - i),USB_CMD_DATA_SIZE);
-				cmd_send(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K,i,len,0,((byte_t*)BigBuf)+c->arg[0]+i,len);
+				cmd_send(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K,i,len,BigBuf_get_traceLen(),BigBuf+c->arg[0]+i,len);
 			}
 			// Trigger a finish downloading signal with an ACK frame
-			cmd_send(CMD_ACK,0,0,0,0,0);
+			cmd_send(CMD_ACK,1,0,BigBuf_get_traceLen(),getSamplingConfig(),sizeof(sample_config));
 			LED_B_OFF();
 			break;
 
 		case CMD_DOWNLOADED_SIM_SAMPLES_125K: {
-			uint8_t *b = (uint8_t *)BigBuf;
+			uint8_t *b = BigBuf_get_addr();
 			memcpy(b+c->arg[0], c->d.asBytes, USB_CMD_DATA_SIZE);
 			cmd_send(CMD_ACK,0,0,0,0,0);
 			break;