CHG: Small steps, the waiting time between frames was unclear. At least now the...

[proxmark3-svn] / armsrc / util.c

diff --git a/armsrc/util.c b/armsrc/util.c
index 37fe3f4396a79be827fd5216c28b1b5973f0c6ae..be6170d36ae282479f71fed2fa4cc02044696172 100644 (file)
--- a/armsrc/util.c
+++ b/armsrc/util.c
@@ -236,10 +236,11 @@ int BUTTON_HELD(int ms) {
 // attempt at high resolution microsecond timer
 // beware: timer counts in 21.3uS increments (1024/48Mhz)
 void SpinDelayUs(int us) {
-       int ticks = (48*us) >> 10;
+       int ticks = (48 * us) >> 10;
 
        // Borrow a PWM unit for my real-time clock
        AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
+       
        // 48 MHz / 1024 gives 46.875 kHz
        AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
        AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
@@ -350,9 +351,7 @@ void StartCountUS() {
 uint32_t RAMFUNC GetCountUS(){
        //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); 
-       //return (AT91C_BASE_TC1->TC_CV << 16) | ((AT91C_BASE_TC0->TC_CV << 1) / 3); 
+       return (AT91C_BASE_TC1->TC_CV * 0x8000) + ((AT91C_BASE_TC0->TC_CV * 2) / 3); 
 }
 void ResetUSClock(void) {      
        //enable clock of timer and software trigger
@@ -360,7 +359,13 @@ void ResetUSClock(void) {
        AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
        while (AT91C_BASE_TC1->TC_CV >= 1);
 }
-
+// attempt at high resolution microsecond timer
+// beware: timer counts in 21.3uS increments (1024/48Mhz)
+void SpinDelayCountUs(uint32_t us) {
+       if (us < 8) return;
+       us += GetCountUS();     
+       while ( GetCountUS() < us ){}
+}
 // static uint32_t GlobalUsCounter = 0;
 
 // uint32_t RAMFUNC GetDeltaCountUS(){