X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/1c611bbd26066e1a8dd36ffd389b57040a7dfad6..39d56ec88be1ee4c8d13f1a08aa40daccab273d6:/armsrc/util.c

diff --git a/armsrc/util.c b/armsrc/util.c
index 9bea9e7e..1dd8dc75 100644
--- a/armsrc/util.c
+++ b/armsrc/util.c
@@ -11,9 +11,31 @@
 #include "proxmark3.h"
 #include "util.h"
 #include "string.h"
+#include "apps.h"
+#include "BigBuf.h"
+
+
+
+void print_result(char *name, uint8_t *buf, size_t len) {
+   uint8_t *p = buf;
+
+   if ( len % 16 == 0 ) {
+	   for(; p-buf < len; p += 16)
+       Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
+				name,
+				p-buf,
+				len,
+				p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]
+	   );
+   }
+   else {
+   for(; p-buf < len; p += 8)
+       Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x", name, p-buf, len, p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
+   }
+}
 
 size_t nbytes(size_t nbits) {
-	return (nbits/8)+((nbits%8)>0);
+	return (nbits >> 3)+((nbits % 8) > 0);
 }
 
 uint32_t SwapBits(uint32_t value, int nrbits) {
@@ -44,6 +66,26 @@ uint64_t bytes_to_num(uint8_t* src, size_t len)
 	return num;
 }
 
+// RotateLeft - Ultralight, Desfire
+void rol(uint8_t *data, const size_t len){
+    uint8_t first = data[0];
+    for (size_t i = 0; i < len-1; i++) {
+        data[i] = data[i+1];
+    }
+    data[len-1] = first;
+}
+void lsl (uint8_t *data, size_t len) {
+    for (size_t n = 0; n < len - 1; n++) {
+        data[n] = (data[n] << 1) | (data[n+1] >> 7);
+    }
+    data[len - 1] <<= 1;
+}
+
+int32_t le24toh (uint8_t data[3])
+{
+    return (data[2] << 16) | (data[1] << 8) | data[0];
+}
+
 void LEDsoff()
 {
 	LED_A_OFF();
@@ -224,29 +266,30 @@ void FormatVersionInformation(char *dst, int len, const char *prefix, void *vers
 {
 	struct version_information *v = (struct version_information*)version_information;
 	dst[0] = 0;
-	strncat(dst, prefix, len);
+	strncat(dst, prefix, len-1);
 	if(v->magic != VERSION_INFORMATION_MAGIC) {
-		strncat(dst, "Missing/Invalid version information", len);
+		strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
 		return;
 	}
 	if(v->versionversion != 1) {
-		strncat(dst, "Version information not understood", len);
+		strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
 		return;
 	}
 	if(!v->present) {
-		strncat(dst, "Version information not available", len);
+		strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
 		return;
 	}
 
-	strncat(dst, v->svnversion, len);
+	strncat(dst, v->gitversion, len - strlen(dst) - 1);
 	if(v->clean == 0) {
-		strncat(dst, "-unclean", len);
+		strncat(dst, "-unclean", len - strlen(dst) - 1);
 	} else if(v->clean == 2) {
-		strncat(dst, "-suspect", len);
+		strncat(dst, "-suspect", len - strlen(dst) - 1);
 	}
 
-	strncat(dst, " ", len);
-	strncat(dst, v->buildtime, len);
+	strncat(dst, " ", len - strlen(dst) - 1);
+	strncat(dst, v->buildtime, len - strlen(dst) - 1);
+	strncat(dst, "\n", len - strlen(dst) - 1);
 }
 
 //  -------------------------------------------------------------------------
@@ -261,11 +304,12 @@ void FormatVersionInformation(char *dst, int len, const char *prefix, void *vers
 
 void StartTickCount()
 {
-//  must be 0x40, but on my cpu - included divider is optimal
-//  0x20 - 1 ms / bit 
-//  0x40 - 2 ms / bit
-
-	AT91C_BASE_RTTC->RTTC_RTMR = AT91C_RTTC_RTTRST + 0x001D; // was 0x003B
+	// This timer is based on the slow clock. The slow clock frequency is between 22kHz and 40kHz.
+	// We can determine the actual slow clock frequency by looking at the Main Clock Frequency Register.
+    uint16_t mainf = AT91C_BASE_PMC->PMC_MCFR & 0xffff;		// = 16 * main clock frequency (16MHz) / slow clock frequency
+	// set RealTimeCounter divider to count at 1kHz:
+	AT91C_BASE_RTTC->RTTC_RTMR = AT91C_RTTC_RTTRST | ((256000 + (mainf/2)) / mainf);
+	// note: worst case precision is approx 2.5%
 }
 
 /*
@@ -315,9 +359,9 @@ uint32_t RAMFUNC GetDeltaCountUS(){
 
 
 //  -------------------------------------------------------------------------
-//  Mifare timer. Uses ssp_clk from FPGA 
+//  Timer for iso14443 commands. Uses ssp_clk from FPGA 
 //  -------------------------------------------------------------------------
-void StartCountMifare()
+void StartCountSspClk()
 {
 	AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0) | (1 << AT91C_ID_TC1) | (1 << AT91C_ID_TC2);  // Enable Clock to all timers
 	AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_TIOA1 		// XC0 Clock = TIOA1
@@ -329,7 +373,7 @@ void StartCountMifare()
 	AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK // TC1 Clock = MCK(48MHz)/2 = 24MHz
 							| AT91C_TC_CPCSTOP				// Stop clock on RC compare
 							| AT91C_TC_EEVTEDG_RISING		// Trigger on rising edge of Event
-							| AT91C_TC_EEVT_TIOB			// Event-Source: TIOB1 (= ssc_clk from FPGA = 13,56MHz / 16)
+							| AT91C_TC_EEVT_TIOB			// Event-Source: TIOB1 (= ssp_clk from FPGA = 13,56MHz/16)
 							| AT91C_TC_ENETRG				// Enable external trigger event
 							| AT91C_TC_WAVESEL_UP	 		// Upmode without automatic trigger on RC compare
 							| AT91C_TC_WAVE 				// Waveform Mode
@@ -338,7 +382,7 @@ void StartCountMifare()
 	AT91C_BASE_TC1->TC_RC = 0x04; 							// RC Compare value = 0x04
 
 	// use TC0 to count TIOA1 pulses
-	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; 				// disable TC0  
+	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;				// disable TC0
 	AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_XC0	 			// TC0 clock = XC0 clock = TIOA1
 							| AT91C_TC_WAVE 				// Waveform Mode
 							| AT91C_TC_WAVESEL_UP	 		// just count
@@ -353,21 +397,37 @@ void StartCountMifare()
 							| AT91C_TC_WAVE 				// Waveform Mode
 							| AT91C_TC_WAVESEL_UP;	 		// just count
 	
-	
 	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN;				// enable TC0
 	AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN;				// enable TC1
 	AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKEN;				// enable TC2
+
+	//
+	// synchronize the counter with the ssp_frame signal. Note: FPGA must be in any iso14446 mode, otherwise the frame signal would not be present 
+	//
+	while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_FRAME)); 	// wait for ssp_frame to go high (start of frame)
+	while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_FRAME); 		// wait for ssp_frame to be low
+	while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)); 	// wait for ssp_clk to go high
+	// note: up to now two ssp_clk rising edges have passed since the rising edge of ssp_frame
+	// it is now safe to assert a sync signal. This sets all timers to 0 on next active clock edge
 	AT91C_BASE_TCB->TCB_BCR = 1;							// assert Sync (set all timers to 0 on next active clock edge)
+	// at the next (3rd) ssp_clk rising edge, TC1 will be reset (and not generate a clock signal to TC0)
+	// at the next (4th) ssp_clk rising edge, TC0 (the low word of our counter) will be reset. From now on,
+	// whenever the last three bits of our counter go 0, we can be sure to be in the middle of a frame transfer.
+	// (just started with the transfer of the 4th Bit).
+	// The high word of the counter (TC2) will not reset until the low word (TC0) overflows. Therefore need to wait quite some time before
+	// we can use the counter.
+	while (AT91C_BASE_TC0->TC_CV < 0xFFF0);
 }
 
 
-uint32_t RAMFUNC GetCountMifare(){
+uint32_t RAMFUNC GetCountSspClk(){
 	uint32_t tmp_count;
 	tmp_count = (AT91C_BASE_TC2->TC_CV << 16) | AT91C_BASE_TC0->TC_CV;
-	if ((tmp_count & 0xffff) == 0) { //small chance that we may have missed an increment in TC2
+	if ((tmp_count & 0x0000ffff) == 0) { //small chance that we may have missed an increment in TC2
 		return (AT91C_BASE_TC2->TC_CV << 16);
 	} 
 	else {
 		return tmp_count;
 	}
 }
+