X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/cba867f20282576a947b2c7f2396cc7b62be655a..refs/pull/246/head:/armsrc/util.c?ds=inline

diff --git a/armsrc/util.c b/armsrc/util.c
index 2d3aab9c..a0fa50d3 100644
--- a/armsrc/util.c
+++ b/armsrc/util.c
@@ -12,9 +12,30 @@
 #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) {
@@ -45,6 +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();
@@ -225,17 +266,17 @@ 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 - strlen(dst) - 1);
+		strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
 		return;
 	}
 	if(v->versionversion != 1) {
-		strncat(dst, "Version information not understood", len - strlen(dst) - 1);
+		strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
 		return;
 	}
 	if(!v->present) {
-		strncat(dst, "Version information not available", len - strlen(dst) - 1);
+		strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
 		return;
 	}
 
@@ -248,6 +289,7 @@ void FormatVersionInformation(char *dst, int len, const char *prefix, void *vers
 
 	strncat(dst, " ", len - strlen(dst) - 1);
 	strncat(dst, v->buildtime, len - strlen(dst) - 1);
+	strncat(dst, "\n", len - strlen(dst) - 1);
 }
 
 //  -------------------------------------------------------------------------
@@ -262,11 +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%
 }
 
 /*
@@ -302,7 +345,7 @@ void StartCountUS()
 	}
 
 uint32_t RAMFUNC GetCountUS(){
-	return (AT91C_BASE_TC1->TC_CV * 0x8000) + ((AT91C_BASE_TC0->TC_CV / 15) * 10);
+	return (AT91C_BASE_TC1->TC_CV * 0x8000) + ((AT91C_BASE_TC0->TC_CV * 2) / 3); //was  /15) * 10);
 }
 
 static uint32_t GlobalUsCounter = 0;
@@ -375,8 +418,13 @@ void StartCountSspClk()
 	// we can use the counter.
 	while (AT91C_BASE_TC0->TC_CV < 0xFFF0);
 }
-
-
+void ResetSspClk(void) {
+	//enable clock of timer and software trigger
+	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
+	AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
+	AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
+	while (AT91C_BASE_TC2->TC_CV > 0);
+}
 uint32_t RAMFUNC GetCountSspClk(){
 	uint32_t tmp_count;
 	tmp_count = (AT91C_BASE_TC2->TC_CV << 16) | AT91C_BASE_TC0->TC_CV;
@@ -388,4 +436,80 @@ uint32_t RAMFUNC GetCountSspClk(){
 	}
 }
 
+//  -------------------------------------------------------------------------
+//  Timer for bitbanging,  or LF stuff when you need a very precis timer
+//  1us = 1.5ticks
+//  -------------------------------------------------------------------------
+void StartTicks(void){
+	//initialization of the timer
+	// tc1 is higher 0xFFFF0000
+	// tc0 is lower 0x0000FFFF
+	AT91C_BASE_PMC->PMC_PCER |= (1 << AT91C_ID_TC0) | (1 << AT91C_ID_TC1);
+	AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_TIOA0 | AT91C_TCB_TC2XC2S_NONE;
+	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;
+	AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK | // MCK(48MHz) / 32 
+								AT91C_TC_WAVE | AT91C_TC_WAVESEL_UP_AUTO | AT91C_TC_ACPA_CLEAR |
+								AT91C_TC_ACPC_SET | AT91C_TC_ASWTRG_SET;
+	AT91C_BASE_TC0->TC_RA = 1;
+	AT91C_BASE_TC0->TC_RC = 0; 
+
+	AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;	// timer disable  
+	AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_XC1; // from TC0
+	
+	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
+	AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
+	AT91C_BASE_TCB->TCB_BCR = 1;
+	
+	// wait until timer becomes zero.
+	while (AT91C_BASE_TC1->TC_CV > 0);
+}
+
+// Wait - Spindelay in ticks.
+// if called with a high number, this will trigger the WDT...
+void WaitTicks(uint32_t ticks){
+	if ( ticks == 0 ) return;
+	ticks += GET_TICKS;	
+	while (GET_TICKS < ticks);
+}
+// Wait / Spindelay in us (microseconds) 
+// 1us = 1.5ticks.
+void WaitUS(uint16_t us){
+	if ( us == 0 ) return;
+	WaitTicks(  (uint32_t)(us * 1.5) );
+}
+void WaitMS(uint16_t ms){
+	if (ms == 0) return;
+	WaitTicks( (uint32_t)(ms * 1500) );
+}
+// Starts Clock and waits until its reset
+void ResetTicks(void){
+	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
+	AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
+	while (AT91C_BASE_TC1->TC_CV > 0);
+}
+void ResetTimer(AT91PS_TC timer){
+	timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
+	while(timer->TC_CV > 0) ;
+}
+// stop clock
+void StopTicks(void){
+	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;
+	AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS;	
+}
+
+static uint64_t next_random = 1;
+
+/* Generates a (non-cryptographically secure) 32-bit random number.
+ *
+ * We don't have an implementation of the "rand" function or a clock to seed it
+ * with, so we just call GetTickCount the first time to seed ourselves.
+ */
+uint32_t prand() {
+	if (next_random == 1) {
+		next_random = GetTickCount();
+	}
+
+	next_random = next_random * 6364136223846793005 + 1;
+	return (uint32_t)(next_random >> 32) % 0xffffffff;
+}