X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/0a39986e01069b05b6463bae6f8141dc801df41a..c6e2bfcda1d13453fe6bf1192422f0974a412dbb:/armsrc/util.c

diff --git a/armsrc/util.c b/armsrc/util.c
index 0172754e..f2298290 100644
--- a/armsrc/util.c
+++ b/armsrc/util.c
@@ -12,6 +12,19 @@
 #include "util.h"
 #include "string.h"
 
+size_t nbytes(size_t nbits) {
+	return (nbits/8)+((nbits%8)>0);
+}
+
+uint32_t SwapBits(uint32_t value, int nrbits) {
+	int i;
+	uint32_t newvalue = 0;
+	for(i = 0; i < nrbits; i++) {
+		newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
+	}
+	return newvalue;
+}
+
 void num_to_bytes(uint64_t n, size_t len, uint8_t* dest)
 {
 	while (len--) {
@@ -259,6 +272,45 @@ void StartTickCount()
 * Get the current count.
 */
 uint32_t RAMFUNC GetTickCount(){
-	return AT91C_BASE_RTTC->RTTC_RTVR;// * 2;
+	return AT91C_BASE_RTTC->RTTC_RTVR;// was * 2;
+}
+
+//  -------------------------------------------------------------------------
+//  microseconds timer 
+//  -------------------------------------------------------------------------
+void StartCountUS()
+{
+	AT91C_BASE_PMC->PMC_PCER |= (0x1 << 12) | (0x1 << 13) | (0x1 << 14);
+//	AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC1XC1S_TIOA0;
+	AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_TIOA0 | AT91C_TCB_TC2XC2S_NONE;
+
+	// 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_BASE_TC0->TC_RA = 1;
+	AT91C_BASE_TC0->TC_RC = 0xBFFF + 1; // 0xC000
+	
+	AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; // timer disable  
+	AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_XC1; // from timer 0
+
+	AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN;
+	AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN;
+	AT91C_BASE_TCB->TCB_BCR = 1;
+}
+
+uint32_t RAMFUNC GetCountUS(){
+	return (AT91C_BASE_TC1->TC_CV * 0x8000) + ((AT91C_BASE_TC0->TC_CV / 15) * 10);
 }
 
+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;
+}
+
+