ADD: @go_tus 's code to generate wiegand codes from FacilityCode/SiteCode and Cardn...

[proxmark3-svn] / armsrc / util.c

diff --git a/armsrc/util.c b/armsrc/util.c
index 889319279750290a9d3627cc177b49eb4e9025bf..3d536f396d6205c5d450a88f3cbed62030049b1b 100644 (file)
--- a/armsrc/util.c
+++ b/armsrc/util.c
@@ -35,7 +35,7 @@ void print_result(char *name, uint8_t *buf, size_t len) {
 }
 
 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) {
@@ -268,15 +268,15 @@ 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) {
-               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;
        }
 
@@ -289,6 +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);
 }
 
 //  -------------------------------------------------------------------------
@@ -303,11 +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%
 }
 
 /*
@@ -343,7 +345,9 @@ 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 / 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); 
 }
 
 static uint32_t GlobalUsCounter = 0;