X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/1dea88f97640f5979b977a14347c558fabd5496c..6c5ad038603d132d10802eecbef5c2f2547d94ae:/armsrc/legicrf.c

diff --git a/armsrc/legicrf.c b/armsrc/legicrf.c
index bb0badb0..86c0c360 100644
--- a/armsrc/legicrf.c
+++ b/armsrc/legicrf.c
@@ -40,45 +40,6 @@ static void setup_timer(void)
 
 #define FUZZ_EQUAL(value, target, fuzz) ((value) > ((target)-(fuzz)) && (value) < ((target)+(fuzz)))
 
-static const struct legic_frame queries[] = {
-		{7, 0x55}, /* 1010 101 */
-};
-
-static const struct legic_frame responses[] = {
-		{6, 0x3b}, /* 1101 11 */
-};
-
-/* Send a frame in tag mode, the FPGA must have been set up by
- * LegicRfSimulate
- */
-static void frame_send_tag(uint16_t response, int bits)
-{
-#if 0
-	/* Use the SSC to send a response. 8-bit transfers, LSBit first, 100us per bit */
-#else 
-	/* Bitbang the response */
-	AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
-	AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;
-	AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;
-	
-	/* Wait for the frame start */
-	while(timer->TC_CV < TAG_TIME_WAIT) ;
-	
-	int i;
-	for(i=0; i<bits; i++) {
-		int nextbit = timer->TC_CV + TAG_TIME_BIT;
-		int bit = response & 1;
-		response = response >> 1;
-		if(bit) 
-			AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
-		else
-			AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
-		while(timer->TC_CV < nextbit) ;
-	}
-	AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
-#endif
-}
-
 /* Send a frame in reader mode, the FPGA must have been set up by
  * LegicRfReader
  */
@@ -119,6 +80,7 @@ static void frame_send_rwd(uint16_t data, int bits)
 	
 	/* Reset the timer, to measure time until the start of the tag frame */
 	timer->TC_CCR = AT91C_TC_SWTRG;
+	while(timer->TC_CV > 1) ; /* Wait till the clock has reset */
 }
 
 /* Receive a frame from the card in reader emulation mode, the FPGA and
@@ -179,56 +141,10 @@ static void frame_receive_rwd(struct legic_frame * const f, int bits)
 	
 	f->data = data;
 	f->bits = bits;
-}
-
-/* Figure out a response to a frame in tag mode */
-static void frame_respond_tag(struct legic_frame const * const f)
-{
-	LED_D_ON();
-	int i, r_size=0;
-	uint16_t r_data=0;
 	
-	for(i=0; i<sizeof(queries)/sizeof(queries[0]); i++) {
-		if(f->bits == queries[i].bits && f->data == queries[i].data) {
-			r_data = responses[i].data;
-			r_size = responses[i].bits;
-			break;
-		}
-	}
-	
-	if(r_size != 0) {
-		frame_send_tag(r_data, r_size);
-		LED_A_ON();
-	} else {
-		LED_A_OFF();
-	}
-	
-	LED_D_OFF();
-}
-
-static void frame_append_bit(struct legic_frame * const f, int bit)
-{
-	if(f->bits >= 15)
-		return; /* Overflow, won't happen */
-	f->data |= (bit<<f->bits);
-	f->bits++;
-}
-
-static int frame_is_empty(struct legic_frame const * const f)
-{
-	return( f->bits <= 4 );
-}
-
-/* Handle (whether to respond) a frame in tag mode */
-static void frame_handle_tag(struct legic_frame const * const f)
-{
-	if(f->bits == 6) {
-		/* Short path */
-		return;
-	}
-	if( !frame_is_empty(f) ) {
-		frame_respond_tag(f);
-	}
+	/* Reset the timer, to synchronize the next frame */
+	timer->TC_CCR = AT91C_TC_SWTRG;
+	while(timer->TC_CV > 1) ; /* Wait till the clock has reset */
 }
 
 static void frame_clean(struct legic_frame * const f)
@@ -237,90 +153,29 @@ static void frame_clean(struct legic_frame * const f)
 	f->bits = 0;
 }
 
-enum emit_mode { 
-	EMIT_RWD, /* Emit in tag simulation mode, e.g. the source is the RWD */
-	EMIT_TAG  /* Emit in reader simulation mode, e.g. the source is the TAG */
-}; 
-static void emit(enum emit_mode mode, int bit)
-{
-	if(bit == -1) {
-		if(mode == EMIT_RWD) {
-			frame_handle_tag(&current_frame);
-		}
-		frame_clean(&current_frame);
-	} else if(bit == 0) {
-		frame_append_bit(&current_frame, 0);
-	} else if(bit == 1) {
-		frame_append_bit(&current_frame, 1);
-	}
-}
-
-void LegicRfSimulate(void)
+static uint16_t perform_setup_phase_rwd(void)
 {
-	/* ADC path high-frequency peak detector, FPGA in high-frequency simulator mode, 
-	 * modulation mode set to 212kHz subcarrier. We are getting the incoming raw
-	 * envelope waveform on DIN and should send our response on DOUT.
-	 * 
-	 * The LEGIC RF protocol is pulse-pause-encoding from reader to card, so we'll
-	 * measure the time between two rising edges on DIN, and no encoding on the
-	 * subcarrier from card to reader, so we'll just shift out our verbatim data
-	 * on DOUT, 1 bit is 100us. The time from reader to card frame is still unclear,
-	 * seems to be 300us-ish.
-	 */
-	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
-	FpgaSetupSsc();
-	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_212K);
 	
-	/* Bitbang the receiver */
-	AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN;
-	AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN;
+	/* Switch on carrier and let the tag charge for 1ms */
+	AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
+	SpinDelay(1);
 	
-	setup_timer();
+	frame_send_rwd(0x55, 7);
+	frame_clean(&current_frame);
+	frame_receive_rwd(&current_frame, 6);
+	while(timer->TC_CV < 387) ; /* ~ 258us */
+	frame_send_rwd(0x019, 6);
 	
-	int old_level = 0;
-	int active = 0;
+	return current_frame.data ^ 0x26;
+}
+
+static void switch_off_tag_rwd(void)
+{
+	/* Switch off carrier, make sure tag is reset */
+	AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
+	SpinDelay(10);
 	
-	while(!BUTTON_PRESS()) {
-		int level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN);
-		int time = timer->TC_CV;
-		
-		if(level != old_level) {
-			if(level == 1) {
-				timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
-				if(FUZZ_EQUAL(time, RWD_TIME_1, RWD_TIME_FUZZ)) {
-					/* 1 bit */
-					emit(EMIT_RWD, 1);
-					active = 1;
-					LED_B_ON();
-				} else if(FUZZ_EQUAL(time, RWD_TIME_0, RWD_TIME_FUZZ)) {
-					/* 0 bit */
-					emit(EMIT_RWD, 0);
-					active = 1;
-					LED_B_ON();
-				} else if(active) {
-					/* invalid */
-					emit(EMIT_RWD, -1);
-					active = 0;
-					LED_B_OFF();
-				}
-			}
-		}
-		
-		if(time >= (RWD_TIME_1+RWD_TIME_FUZZ) && active) {
-			/* Frame end */
-			emit(EMIT_RWD, -1);
-			active = 0;
-			LED_B_OFF();
-		}
-		
-		if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA)) {
-			timer->TC_CCR = AT91C_TC_CLKDIS;
-		}
-		
-		
-		old_level = level;
-		WDT_HIT();
-	}
+	WDT_HIT();
 }
 
 void LegicRfReader(void)
@@ -336,25 +191,62 @@ void LegicRfReader(void)
 	
 	setup_timer();
 	
-	while(!BUTTON_PRESS()) {
-		/* Switch on carrier and let the tag charge for 1ms */
-		AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT;
-		SpinDelay(1);
-		
-		LED_A_ON();
-		frame_send_rwd(queries[0].data, queries[0].bits);
-		LED_A_OFF();
+	memset(BigBuf, 0, 1024);
+	
+	int byte_index = 0, card_size = 0, command_size = 0;
+	uint16_t command_obfuscation = 0x57, response_obfuscation = 0;
+	uint16_t tag_type = perform_setup_phase_rwd();
+	switch_off_tag_rwd();
+	
+	int error = 0;
+	switch(tag_type) {
+	case 0x1d:
+		DbpString("MIM 256 card found, reading card ...");
+		command_size = 9;
+		card_size = 256;
+		response_obfuscation = 0x52;
+		break;
+	case 0x3d:
+		DbpString("MIM 1024 card found, reading card ...");
+		command_size = 11;
+		card_size = 1024;
+		response_obfuscation = 0xd4;
+		break;
+	default:
+		DbpString("No or unknown card found, aborting");
+		error = 1;
+		break;
+	}
+	
+	LED_B_ON();
+	while(!BUTTON_PRESS() && (byte_index<card_size)) {
+		if(perform_setup_phase_rwd() != tag_type) {
+			DbpString("Card removed, aborting");
+			switch_off_tag_rwd();
+			error=1;
+			break;
+		}
 		
+		while(timer->TC_CV < 387) ; /* ~ 258us */
+		frame_send_rwd(command_obfuscation ^ (byte_index<<1), command_size);
 		frame_clean(&current_frame);
-		LED_B_ON();
-		frame_receive_rwd(&current_frame, responses[0].bits);
-		LED_B_OFF();
+		frame_receive_rwd(&current_frame, 8);
+		((uint8_t*)BigBuf)[byte_index] = (current_frame.data ^ response_obfuscation) & 0xff;
 		
-		/* Switch off carrier, make sure tag is reset */
-		AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT;
-		SpinDelay(10);
+		switch_off_tag_rwd();
 		
 		WDT_HIT();
+		byte_index++;
+		if(byte_index & 0x04) LED_C_ON(); else LED_C_OFF();
+	}
+	LED_B_OFF();
+	LED_C_OFF();
+	
+	if(!error) {
+		if(card_size == 256) {
+			DbpString("Card read, use hexsamples 256 to view results");
+		} else if(card_size == 1024) {
+			DbpString("Card read, use hexsamples 1024 to view results");
+		}
 	}
-	
 }