X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/6799b193741ead38211998950b10fb03fbf69d90..30daf914cee4594c1482da861bfdcf7d7d16cfc5:/armsrc/iclass.c

diff --git a/armsrc/iclass.c b/armsrc/iclass.c
index 2dff8a4e..42deea86 100644
--- a/armsrc/iclass.c
+++ b/armsrc/iclass.c
@@ -633,8 +633,6 @@ static RAMFUNC int ManchesterDecoding(int v)
 //-----------------------------------------------------------------------------
 void RAMFUNC SnoopIClass(void)
 {
-
-
     // We won't start recording the frames that we acquire until we trigger;
     // a good trigger condition to get started is probably when we see a
     // response from the tag.
@@ -655,8 +653,9 @@ void RAMFUNC SnoopIClass(void)
     // The DMA buffer, used to stream samples from the FPGA
     uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
  
-	set_tracing(TRUE);
 	clear_trace();
+	set_tracing(TRUE);
+	
     iso14a_set_trigger(FALSE);
 
     int lastRxCounter;
@@ -678,7 +677,11 @@ void RAMFUNC SnoopIClass(void)
     FpgaSetupSsc();
     upTo = dmaBuf;
     lastRxCounter = DMA_BUFFER_SIZE;
-    FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
+	// Setup and start DMA.
+	if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE) ){
+		if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting"); 
+		return;
+	}
 
     // And the reader -> tag commands
     memset(&Uart, 0, sizeof(Uart));
@@ -705,22 +708,22 @@ void RAMFUNC SnoopIClass(void)
     for(;;) {
         LED_A_ON();
         WDT_HIT();
-        int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) &
-                                (DMA_BUFFER_SIZE-1);
-        if(behindBy > maxBehindBy) {
+        int behindBy = (lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR) & (DMA_BUFFER_SIZE-1);
+
+        if ( behindBy > maxBehindBy) {
             maxBehindBy = behindBy;
-            if(behindBy > (9 * DMA_BUFFER_SIZE / 10)) {
+            if ( behindBy > (9 * DMA_BUFFER_SIZE / 10)) {
                 Dbprintf("blew circular buffer! behindBy=0x%x", behindBy);
                 goto done;
             }
         }
-        if(behindBy < 1) continue;
+        if( behindBy < 1) continue;
 
-	LED_A_OFF();
+		LED_A_OFF();
         smpl = upTo[0];
         upTo++;
         lastRxCounter -= 1;
-        if(upTo - dmaBuf > DMA_BUFFER_SIZE) {
+        if (upTo - dmaBuf > DMA_BUFFER_SIZE) {
             upTo -= DMA_BUFFER_SIZE;
             lastRxCounter += DMA_BUFFER_SIZE;
             AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) upTo;
@@ -728,77 +731,75 @@ void RAMFUNC SnoopIClass(void)
         }
 
         //samples += 4;
-	samples += 1;
+		samples += 1;
 
-	if(smpl & 0xF) {
-		decbyte ^= (1 << (3 - div));
-	}
+		if(smpl & 0xF)
+			decbyte ^= (1 << (3 - div));
+	
 	
-	// FOR READER SIDE COMMUMICATION...
+		// FOR READER SIDE COMMUMICATION...
 
-	decbyter <<= 2;
-	decbyter ^= (smpl & 0x30);
+		decbyter <<= 2;
+		decbyter ^= (smpl & 0x30);
 
-	div++;
+		++div;
 	
-	if((div + 1) % 2 == 0) {
-		smpl = decbyter;	
-		if(OutOfNDecoding((smpl & 0xF0) >> 4)) {
-		    rsamples = samples - Uart.samples;
-			time_stop = (GetCountSspClk()-time_0) << 4;
-		    LED_C_ON();
-
-			//if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,TRUE)) break;
-			//if(!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break;
-			if(tracing)	{
-				uint8_t parity[MAX_PARITY_SIZE];
-				GetParity(Uart.output, Uart.byteCnt, parity);
-				LogTrace(Uart.output,Uart.byteCnt, time_start, time_stop, parity, TRUE);
-			}
-
+		if (( div + 1) % 2 == 0) {
+			smpl = decbyter;	
+			if ( OutOfNDecoding((smpl & 0xF0) >> 4)) {
+				rsamples = samples - Uart.samples;
+				time_stop = (GetCountSspClk()-time_0) << 4;
+				LED_C_ON();
+
+				//if(!LogTrace(Uart.output,Uart.byteCnt, rsamples, Uart.parityBits,TRUE)) break;
+				//if(!LogTrace(NULL, 0, Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER, 0, TRUE)) break;
+				if(tracing)	{
+					uint8_t parity[MAX_PARITY_SIZE];
+					GetParity(Uart.output, Uart.byteCnt, parity);
+					LogTrace(Uart.output,Uart.byteCnt, time_start, time_stop, parity, TRUE);
+				}
 
-			/* And ready to receive another command. */
-		    Uart.state = STATE_UNSYNCD;
-		    /* And also reset the demod code, which might have been */
-		    /* false-triggered by the commands from the reader. */
-		    Demod.state = DEMOD_UNSYNCD;
-		    LED_B_OFF();
-		    Uart.byteCnt = 0;
-		}else{
-			time_start = (GetCountSspClk()-time_0) << 4;
+				/* And ready to receive another command. */
+				Uart.state = STATE_UNSYNCD;
+				/* And also reset the demod code, which might have been */
+				/* false-triggered by the commands from the reader. */
+				Demod.state = DEMOD_UNSYNCD;
+				LED_B_OFF();
+				Uart.byteCnt = 0;
+			} else {
+				time_start = (GetCountSspClk()-time_0) << 4;
+			}
+			decbyter = 0;
 		}
-		decbyter = 0;
-	}
 
-	if(div > 3) {
-		smpl = decbyte;
-		if(ManchesterDecoding(smpl & 0x0F)) {
-			time_stop = (GetCountSspClk()-time_0) << 4;
+		if(div > 3) {
+			smpl = decbyte;
+			if(ManchesterDecoding(smpl & 0x0F)) {
+				time_stop = (GetCountSspClk()-time_0) << 4;
 
-		    rsamples = samples - Demod.samples;
-		    LED_B_ON();
+				rsamples = samples - Demod.samples;
+				LED_B_ON();
 
-			if(tracing)	{
-				uint8_t parity[MAX_PARITY_SIZE];
-				GetParity(Demod.output, Demod.len, parity);
-				LogTrace(Demod.output, Demod.len, time_start, time_stop, parity, FALSE);
-			}
+				if(tracing)	{
+					uint8_t parity[MAX_PARITY_SIZE];
+					GetParity(Demod.output, Demod.len, parity);
+					LogTrace(Demod.output, Demod.len, time_start, time_stop, parity, FALSE);
+				}
 
-		    // And ready to receive another response.
-		    memset(&Demod, 0, sizeof(Demod));
-			Demod.output = tagToReaderResponse;
-		    Demod.state = DEMOD_UNSYNCD;
-		    LED_C_OFF();
-		}else{
-			time_start = (GetCountSspClk()-time_0) << 4;
+				// And ready to receive another response.
+				memset(&Demod, 0, sizeof(Demod));
+				Demod.output = tagToReaderResponse;
+				Demod.state = DEMOD_UNSYNCD;
+				LED_C_OFF();
+			} else {
+				time_start = (GetCountSspClk()-time_0) << 4;
+			}
+			
+			div = 0;
+			decbyte = 0x00;
 		}
-		
-		div = 0;
-		decbyte = 0x00;
-	}
-	//}
 
-        if(BUTTON_PRESS()) {
+        if (BUTTON_PRESS()) {
             DbpString("cancelled_a");
             goto done;
         }
@@ -810,21 +811,17 @@ void RAMFUNC SnoopIClass(void)
 	Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
 
 done:
-    AT91C_BASE_PDC_SSC->PDC_PTCR = AT91C_PDC_RXTDIS;
+    FpgaDisableSscDma();
     Dbprintf("%x %x %x", maxBehindBy, Uart.state, Uart.byteCnt);
 	Dbprintf("%x %x %x", Uart.byteCntMax, BigBuf_get_traceLen(), (int)Uart.output[0]);
-    LED_A_OFF();
-    LED_B_OFF();
-    LED_C_OFF();
-    LED_D_OFF();
+	LEDsoff();
 	set_tracing(FALSE);	
 }
 
 void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {
 	int i; 
-	for(i = 0; i < 8; i++) {
+	for(i = 0; i < 8; i++)
 		rotatedCSN[i] = (originalCSN[i] >> 3) | (originalCSN[(i+1)%8] << 5);
-	}
 }
 
 //-----------------------------------------------------------------------------
@@ -926,7 +923,7 @@ static void CodeIClassTagAnswer(const uint8_t *cmd, int len)
 	 * The mode FPGA_HF_SIMULATOR_MODULATE_424K_8BIT which we use to simulate tag,
 	 * works like this.
 	 * - A 1-bit input to the FPGA becomes 8 pulses on 423.5kHz (fc/32) (18.88us).
-	 * - A 0-bit inptu to the FPGA becomes an unmodulated time of 18.88us
+	 * - A 0-bit input to the FPGA becomes an unmodulated time of 18.88us
 	 *
 	 * In this mode the SOF can be written as 00011101 = 0x1D
 	 * The EOF can be written as 10111000 = 0xb8
@@ -993,8 +990,9 @@ void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain
 	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 
 	// Enable and clear the trace
-	set_tracing(TRUE);
 	clear_trace();
+	set_tracing(TRUE);
+
 	//Use the emulator memory for SIM
 	uint8_t *emulator = BigBuf_get_EM_addr();
 
@@ -1302,7 +1300,8 @@ int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf)
 			receivedCmd[3], receivedCmd[4], receivedCmd[5],
 			receivedCmd[6], receivedCmd[7], receivedCmd[8]);
 			// Do not respond
-			modulated_response = resp_sof; modulated_response_size = 0; //order = 0;
+			modulated_response = resp_sof;
+			modulated_response_size = 0; //order = 0;
 			trace_data = NULL;
 			trace_data_size = 0;
 		}
@@ -1331,23 +1330,17 @@ int doIClassSimulation( int simulationMode, uint8_t *reader_mac_buf)
 				GetParity(trace_data, trace_data_size, parity);
 				LogTrace(trace_data, trace_data_size, (t2r_time-time_0) << 4, (t2r_time-time_0) << 4, parity, FALSE);
 			}
-			if(!tracing) {
+			if(!tracing)
 				DbpString("Trace full");
-				//break;
-			}
 
 		}
 	}
 
-	//Dbprintf("%x", cmdsRecvd);
-	LED_A_OFF();
-	LED_B_OFF();
-	LED_C_OFF();
-
+	LEDsoff();
+	
 	if(buttonPressed)
-	{
 		DbpString("Button pressed");
-	}
+	
 	return buttonPressed;
 }
 
@@ -1395,63 +1388,62 @@ static int SendIClassAnswer(uint8_t *resp, int respLen, int delay)
 //-----------------------------------------------------------------------------
 static void TransmitIClassCommand(const uint8_t *cmd, int len, int *samples, int *wait)
 {
-  int c;
-  FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-  AT91C_BASE_SSC->SSC_THR = 0x00;
-  FpgaSetupSsc();
-
-   if (wait)
-   {
-     if(*wait < 10) *wait = 10;
-     
-  for(c = 0; c < *wait;) {
-    if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
-      AT91C_BASE_SSC->SSC_THR = 0x00;		// For exact timing!
-      c++;
-    }
-    if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-      volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
-      (void)r;
-    }
-    WDT_HIT();
-  }
+	int c;
+	volatile uint32_t r;
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
+	AT91C_BASE_SSC->SSC_THR = 0x00;
+	FpgaSetupSsc();
 
-   }
+	if (wait) {
+		if(*wait < 10) *wait = 10;
 
+		for(c = 0; c < *wait;) {
+			if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+				AT91C_BASE_SSC->SSC_THR = 0x00;		// For exact timing!
+				c++;
+			}
+			if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+				r = AT91C_BASE_SSC->SSC_RHR;
+				(void)r;
+			}
+			WDT_HIT();
+		}
+	}
 
-  uint8_t sendbyte;
-  bool firstpart = TRUE;
-  c = 0;
-  for(;;) {
-    if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
 
-      // DOUBLE THE SAMPLES!
-      if(firstpart) {
-	sendbyte = (cmd[c] & 0xf0) | (cmd[c] >> 4); 
-      }
-      else {
-	sendbyte = (cmd[c] & 0x0f) | (cmd[c] << 4);
-        c++;
-      }
-      if(sendbyte == 0xff) {
-	sendbyte = 0xfe;
-      }
-      AT91C_BASE_SSC->SSC_THR = sendbyte;
-      firstpart = !firstpart;
+	uint8_t sendbyte;
+	bool firstpart = TRUE;
+	c = 0;
+	for(;;) {
+		if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
 
-      if(c >= len) {
-        break;
-      }
-    }
-    if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-      volatile uint32_t r = AT91C_BASE_SSC->SSC_RHR;
-      (void)r;
-    }
-    WDT_HIT();
-  }
-  if (samples) *samples = (c + *wait) << 3;
-}
+			// DOUBLE THE SAMPLES!
+			if(firstpart) {
+				sendbyte = (cmd[c] & 0xf0) | (cmd[c] >> 4); 
+			}
+			else {
+				sendbyte = (cmd[c] & 0x0f) | (cmd[c] << 4);
+				c++;
+			}
+
+			if(sendbyte == 0xff)
+				sendbyte = 0xfe;
 
+			AT91C_BASE_SSC->SSC_THR = sendbyte;
+			firstpart = !firstpart;
+
+			if(c >= len) break;
+
+		}
+		if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+			r = AT91C_BASE_SSC->SSC_RHR;
+			(void)r;
+		}
+		
+		WDT_HIT();
+	}
+	if (samples && wait) *samples = (c + *wait) << 3;
+}
 
 //-----------------------------------------------------------------------------
 // Prepare iClass reader command to send to FPGA
@@ -1551,9 +1543,15 @@ static int GetIClassAnswer(uint8_t *receivedResponse, int maxLen, int *samples,
 			if (elapsed) (*elapsed)++;
 		}
 		if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
-			if(c < timeout) { c++; } else { return FALSE; }
+			if(c < timeout)
+				c++;
+			else 
+				return FALSE;
+			
 			b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+			
 			skip = !skip;
+			
 			if(skip) continue;
 		
 			if(ManchesterDecoding(b & 0x0f)) {
@@ -1582,9 +1580,9 @@ void setupIclassReader()
 {
     FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
     // Reset trace buffer
-	set_tracing(TRUE);
 	clear_trace();
-
+	set_tracing(TRUE);
+	
     // Setup SSC
     FpgaSetupSsc();
     // Start from off (no field generated)
@@ -1705,7 +1703,9 @@ void ReaderIClass(uint8_t arg0) {
     while(!BUTTON_PRESS())
     {
 		if (try_once && tryCnt > 5) break; 
+		
 		tryCnt++;
+		
 		if(!tracing) {
 			DbpString("Trace full");
 			break;