//-----------------------------------------------------------------------------
// Timers, Clocks functions used in LF or Legic where you would need detailed time.
//-----------------------------------------------------------------------------
-
#include "ticks.h"
-
// attempt at high resolution microsecond timer
// beware: timer counts in 21.3uS increments (1024/48Mhz)
void SpinDelayUs(int us) {
// SpinDelay(1000);
// ti = GetTickCount() - ti;
// Dbprintf("timer(1s): %d t=%d", ti, GetTickCount());
-
-void StartTickCount() {
+void StartTickCount(void) {
// 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
/*
* Get the current count.
*/
-uint32_t RAMFUNC GetTickCount(){
+uint32_t RAMFUNC GetTickCount(void){
return AT91C_BASE_RTTC->RTTC_RTVR;// was * 2;
}
// -------------------------------------------------------------------------
// microseconds timer
// -------------------------------------------------------------------------
-void StartCountUS() {
- AT91C_BASE_PMC->PMC_PCER |= (1 << 12) | (1 << 13) | (1 << 14);
+void StartCountUS(void) {
+ 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;
// fast clock
AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG;
AT91C_BASE_TCB->TCB_BCR = 1;
- while (AT91C_BASE_TC1->TC_CV >= 1);
+ while (AT91C_BASE_TC1->TC_CV > 0);
}
-uint32_t RAMFUNC GetCountUS(){
+uint32_t RAMFUNC GetCountUS(void){
//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);
}
-void ResetUSClock(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;
- 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(){
- // uint32_t g_cnt = GetCountUS();
- // uint32_t g_res = g_cnt - GlobalUsCounter;
- // GlobalUsCounter = g_cnt;
- // return g_res;
-// }
+
// -------------------------------------------------------------------------
// Timer for iso14443 commands. Uses ssp_clk from FPGA
// -------------------------------------------------------------------------
-void StartCountSspClk() {
- AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0) | (1 << AT91C_ID_TC1) | (1 << AT91C_ID_TC2); // Enable Clock to all timers
+void StartCountSspClk(void) {
+ AT91C_BASE_PMC->PMC_PCER |= (1 << AT91C_ID_TC0) | (1 << AT91C_ID_TC1) | (1 << AT91C_ID_TC2); // Enable Clock to all timers
AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_TIOA1 // XC0 Clock = TIOA1
| AT91C_TCB_TC1XC1S_NONE // XC1 Clock = none
| AT91C_TCB_TC2XC2S_TIOA0; // XC2 Clock = TIOA0
// 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_TC2->TC_CV >= 1);
+ while (AT91C_BASE_TC2->TC_CV > 0);
}
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);
}
-
-uint32_t RAMFUNC GetCountSspClk(){
-
+uint32_t RAMFUNC GetCountSspClk(void) {
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 tmp_count;
}
-
+// -------------------------------------------------------------------------
+// Timer for bitbanging, or LF stuff when you need a very precis timer
+// 1us = 1.5ticks
+// -------------------------------------------------------------------------
void StartTicks(void){
//initialization of the timer
- AT91C_BASE_PMC->PMC_PCER |= (1 << 12) | (1 << 13) | (1 << 14);
+ // 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;
- // fast clock TC0
- // tick=1.5mks
- AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
- AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK; //clock at 48/32 MHz
+ AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; // timer disable
+ AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_XC1; // from TC0
- // Enable and reset timer
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_TC0->TC_CV > 1);
+ while (AT91C_BASE_TC1->TC_CV > 0);
}
// Wait - Spindelay in ticks.
// if called with a high number, this will trigger the WDT...
WaitTicks( (uint32_t)(ms * 1500) );
}
// Starts Clock and waits until its reset
-void ResetTicks(){
- ResetTimer(AT91C_BASE_TC0);
+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 > 1) ;
+ 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;
}
projects / proxmark3-svn / blobdiff