Update README.md

[proxmark3-svn] / armsrc / util.c

diff --git a/armsrc/util.c b/armsrc/util.c
index 6d34ae5e80f0f3cad520bdf480f75e9396956638..e25c6e0ba8e98d9c836082568150281f1581084e 100644 (file)
--- a/armsrc/util.c
+++ b/armsrc/util.c
@@ -12,9 +12,30 @@
 #include "util.h"
 #include "string.h"
 #include "apps.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) {
 
 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) {
 }
 
 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;
 }
 
        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();
 void LEDsoff()
 {
        LED_A_OFF();


@@ -225,31 +266,33 @@ void FormatVersionInformation(char *dst, int len, const char *prefix, void *vers
 {
        struct version_information *v = (struct version_information*)version_information;
        dst[0] = 0;
 {
        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) {
        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) {
                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) {
                return;
        }
        if(!v->present) {

-               strncat(dst, "Version information not available", len);
+               strncat(dst, "Version information not available\n", len - strlen(dst) - 1);

                return;
        }
 
                return;
        }
 

-       strncat(dst, v->svnversion, len);
+       strncat(dst, v->gitversion, len - strlen(dst) - 1);

        if(v->clean == 0) {
        if(v->clean == 0) {

-               strncat(dst, "-unclean", len);
+               strncat(dst, "-unclean", len - strlen(dst) - 1);

        } else if(v->clean == 2) {
        } 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);

 }
 
 }
 

+

 //  -------------------------------------------------------------------------
 //  timer lib
 //  -------------------------------------------------------------------------
 //  -------------------------------------------------------------------------
 //  timer lib
 //  -------------------------------------------------------------------------


@@ -262,13 +305,15 @@ void FormatVersionInformation(char *dst, int len, const char *prefix, void *vers
 
 void StartTickCount()
 {
 
 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%

 }
 
 }
 

+

 /*
 * Get the current count.
 */
 /*
 * Get the current count.
 */


@@ -276,6 +321,7 @@ uint32_t RAMFUNC GetTickCount(){
        return AT91C_BASE_RTTC->RTTC_RTVR;// was * 2;
 }
 
        return AT91C_BASE_RTTC->RTTC_RTVR;// was * 2;
 }
 

+

 //  -------------------------------------------------------------------------
 //  microseconds timer 
 //  -------------------------------------------------------------------------
 //  -------------------------------------------------------------------------
 //  microseconds timer 
 //  -------------------------------------------------------------------------


@@ -301,10 +347,12 @@ void StartCountUS()
        AT91C_BASE_TCB->TCB_BCR = 1;
        }
 
        AT91C_BASE_TCB->TCB_BCR = 1;
        }
 

+

 uint32_t RAMFUNC GetCountUS(){
 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;
 
 uint32_t RAMFUNC GetDeltaCountUS(){
 static uint32_t GlobalUsCounter = 0;
 
 uint32_t RAMFUNC GetDeltaCountUS(){


@@ -359,12 +407,10 @@ void StartCountSspClk()
        AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKEN;                                // enable TC2
 
        //
        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 
+       // synchronize the counter with the ssp_frame signal. Note: FPGA must be in any iso14443 mode, otherwise SSC_FRAME and SSC_CLK signals 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_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

-       // after the falling edge of ssp_frame, there is delay of 1/13,56MHz (73ns) until the next rising edge of ssp_clk. This are only a few
-       // processor cycles. We therefore may or may not be able to sync on this edge. Therefore better make sure that we miss it:

        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
        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


@@ -375,7 +421,17 @@ void StartCountSspClk()
        // (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.
        // (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);
+       while (AT91C_BASE_TC0->TC_CV < 0xFFFF);
+       // Note: needs one more SSP_CLK cycle (1.18 us) until TC2 resets. Don't call GetCountSspClk() that soon.
+}
+
+
+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);

 }
 
 
 }
 
 


@@ -391,3 +447,91 @@ 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;
+}