X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/22f4dca88cc008287b1ef01bb4da0d46cbcf76d1..25cb718daf70da6f278428b66e9766cd81f3b5ef:/armsrc/ticks.c diff --git a/armsrc/ticks.c b/armsrc/ticks.c index 43b006ff..44249879 100644 --- a/armsrc/ticks.c +++ b/armsrc/ticks.c @@ -8,7 +8,6 @@ //----------------------------------------------------------------------------- // Timers, Clocks functions used in LF or Legic where you would need detailed time. //----------------------------------------------------------------------------- - #include "ticks.h" // attempt at high resolution microsecond timer @@ -48,8 +47,7 @@ void SpinDelay(int ms) { // 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 @@ -61,14 +59,14 @@ void StartTickCount() { /* * 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() { +void StartCountUS(void) { AT91C_BASE_PMC->PMC_PCER |= (1 << 12) | (1 << 13) | (1 << 14); AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_TIOA0 | AT91C_TCB_TC2XC2S_NONE; @@ -91,35 +89,17 @@ void StartCountUS() { while (AT91C_BASE_TC1->TC_CV >= 1); } -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() { +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 @@ -181,10 +161,10 @@ void ResetSspClk(void) { 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 >= 1); } -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); @@ -192,21 +172,32 @@ uint32_t RAMFUNC GetCountSspClk(){ } +// ------------------------------------------------------------------------- +// Timer for bitbanging, or LF stuff when you need a very precis timer +// 1us = 1.5ticks +// ------------------------------------------------------------------------- void StartTicks(void){ //initialization of the timer + // tc1 is higher 0xFFFF0000 + // tc0 is lower 0x0000FFFF AT91C_BASE_PMC->PMC_PCER |= (1 << 12) | (1 << 13) | (1 << 14); 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 >= 1); } // Wait - Spindelay in ticks. // if called with a high number, this will trigger the WDT... @@ -226,10 +217,17 @@ void WaitMS(uint16_t ms){ 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 >= 1); } void ResetTimer(AT91PS_TC timer){ timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; - while(timer->TC_CV > 1) ; + while(timer->TC_CV >= 1) ; +} +// stop clock +void StopTicks(void){ + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; }