chg: changed comment

[proxmark3-svn] / armsrc / util.c

diff --git a/armsrc/util.c b/armsrc/util.c
index c3d4d2c621d3d3252dd06415de5f6084204af37e..120e7b44cb19de4f94ec23d64244fc35ddf547cc 100644 (file)
--- a/armsrc/util.c
+++ b/armsrc/util.c
@@ -8,30 +8,32 @@
 // Utility functions used in many places, not specific to any piece of code.
 //-----------------------------------------------------------------------------
 
 // Utility functions used in many places, not specific to any piece of code.
 //-----------------------------------------------------------------------------
 

-#include "../include/proxmark3.h"
+#include "proxmark3.h"

 #include "util.h"
 #include "string.h"
 #include "apps.h"
 #include "BigBuf.h"
 
 #include "util.h"
 #include "string.h"
 #include "apps.h"
 #include "BigBuf.h"
 

-
-

 void print_result(char *name, uint8_t *buf, size_t len) {
 void print_result(char *name, uint8_t *buf, size_t len) {

-   uint8_t *p = buf;
+       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",
+       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]
                                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]);
-   }
+                       );
+       }
+       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) {


@@ -39,27 +41,23 @@ size_t nbytes(size_t nbits) {
 }
 
 uint32_t SwapBits(uint32_t value, int nrbits) {
 }
 
 uint32_t SwapBits(uint32_t value, int nrbits) {

-       int i;

        uint32_t newvalue = 0;
        uint32_t newvalue = 0;

-       for(i = 0; i < nrbits; i++) {
+       for(int i = 0; i < nrbits; i++) {

                newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
        }
        return newvalue;
 }
 
                newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
        }
        return newvalue;
 }
 

-void num_to_bytes(uint64_t n, size_t len, uint8_t* dest)
-{
+void num_to_bytes(uint64_t n, size_t len, uint8_t* dest) {

        while (len--) {
                dest[len] = (uint8_t) n;
                n >>= 8;
        }
 }
 
        while (len--) {
                dest[len] = (uint8_t) n;
                n >>= 8;
        }
 }
 

-uint64_t bytes_to_num(uint8_t* src, size_t len)
-{
+uint64_t bytes_to_num(uint8_t* src, size_t len) {

        uint64_t num = 0;
        uint64_t num = 0;

-       while (len--)
-       {
+       while (len--) {

                num = (num << 8) | (*src);
                src++;
        }
                num = (num << 8) | (*src);
                src++;
        }


@@ -67,13 +65,14 @@ uint64_t bytes_to_num(uint8_t* src, size_t len)
 }
 
 // RotateLeft - Ultralight, Desfire
 }
 
 // RotateLeft - Ultralight, Desfire

-void rol(uint8_t *data, const size_t len){
+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;
 }
     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);
 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);


@@ -268,15 +267,15 @@ void FormatVersionInformation(char *dst, int len, const char *prefix, void *vers
        dst[0] = 0;
        strncat(dst, prefix, len-1);
        if(v->magic != VERSION_INFORMATION_MAGIC) {
        dst[0] = 0;
        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) {
                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) {
                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;
        }
 
                return;
        }
 


@@ -289,6 +288,7 @@ 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, " ", len - strlen(dst) - 1);
        strncat(dst, v->buildtime, len - strlen(dst) - 1);

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

 }
 
 //  -------------------------------------------------------------------------
 }
 
 //  -------------------------------------------------------------------------


@@ -303,11 +303,12 @@ 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%

 }
 
 /*
 }
 
 /*


@@ -329,8 +330,8 @@ void StartCountUS()
        // fast clock
        AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
        AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK | // MCK(48MHz)/32 -- tick=1.5mks
        // fast clock
        AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
        AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK | // MCK(48MHz)/32 -- tick=1.5mks

-                                                                                                               AT91C_TC_WAVE | AT91C_TC_WAVESEL_UP_AUTO | AT91C_TC_ACPA_CLEAR |
-                                                                                                               AT91C_TC_ACPC_SET | AT91C_TC_ASWTRG_SET;
+                                                               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 = 0xBFFF + 1; // 0xC000
        
        AT91C_BASE_TC0->TC_RA = 1;
        AT91C_BASE_TC0->TC_RC = 0xBFFF + 1; // 0xC000
        


@@ -343,17 +344,20 @@ void StartCountUS()
        }
 
 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 / 15) * 10);
+       //  By suggestion from PwPiwi, http://www.proxmark.org/forum/viewtopic.php?pid=17548#p17548
+       //return (AT91C_BASE_TC1->TC_CV * 0x8000) + ((AT91C_BASE_TC0->TC_CV * 2) / 3); 
+       return (AT91C_BASE_TC1->TC_CV * 0x8000) + ((AT91C_BASE_TC0->TC_CV << 1) / 3); 

 }
 
 }
 

-static uint32_t GlobalUsCounter = 0;
+// static uint32_t GlobalUsCounter = 0;

 
 

-uint32_t RAMFUNC GetDeltaCountUS(){
-       uint32_t g_cnt = GetCountUS();
-       uint32_t g_res = g_cnt - GlobalUsCounter;
-       GlobalUsCounter = g_cnt;
-       return g_res;
-}
+// uint32_t RAMFUNC GetDeltaCountUS(){
+       // uint32_t g_cnt = GetCountUS();
+       // uint32_t g_res = g_cnt - GlobalUsCounter;
+       // GlobalUsCounter = g_cnt;
+       // return g_res;
+// }

 
 
 //  -------------------------------------------------------------------------
 
 
 //  -------------------------------------------------------------------------


@@ -394,17 +398,17 @@ void StartCountSspClk()
        AT91C_BASE_TC2->TC_CMR = AT91C_TC_CLKS_XC2                              // TC2 clock = XC2 clock = TIOA0
                                                        | AT91C_TC_WAVE                                 // Waveform Mode
                                                        | AT91C_TC_WAVESEL_UP;                  // just count
        AT91C_BASE_TC2->TC_CMR = AT91C_TC_CLKS_XC2                              // TC2 clock = XC2 clock = TIOA0
                                                        | 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
 
        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 
-       //
+       // synchronize the counter with the ssp_frame signal. 
+       // Note: FPGA must be in any iso14443 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
        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)
        // 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)


@@ -412,20 +416,16 @@ void StartCountSspClk()
        // 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).
        // 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.
+
+       // 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 < 0xFFF0);
 }
 

-

 uint32_t RAMFUNC GetCountSspClk(){
 uint32_t RAMFUNC GetCountSspClk(){

-       uint32_t tmp_count;
-       tmp_count = (AT91C_BASE_TC2->TC_CV << 16) | AT91C_BASE_TC0->TC_CV;
-       if ((tmp_count & 0x0000ffff) == 0) { //small chance that we may have missed an increment in TC2
+       uint32_t tmp_count = (AT91C_BASE_TC2->TC_CV << 16) | AT91C_BASE_TC0->TC_CV;
+       if ((tmp_count & 0x0000ffff) == 0)  //small chance that we may have missed an increment in TC2

                return (AT91C_BASE_TC2->TC_CV << 16);
                return (AT91C_BASE_TC2->TC_CV << 16);

-       } 
-       else {
-               return tmp_count;
-       }
+       return tmp_count;

 }
 
 }