-
-// -------------------------------------------------------------------------
-// timer lib
-// -------------------------------------------------------------------------
-// test procedure:
-//
-// ti = GetTickCount();
-// SpinDelay(1000);
-// ti = GetTickCount() - ti;
-// Dbprintf("timer(1s): %d t=%d", ti, GetTickCount());
-
-void StartTickCount() {
- // 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%
-}
-
-/*
-* Get the current count.
-*/
-uint32_t RAMFUNC GetTickCount(){
- 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);
- // 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);
-}
-
-// 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
- 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
-
- // configure TC1 to create a short pulse on TIOA1 when a rising edge on TIOB1 (= ssp_clk from FPGA) occurs:
- AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; // disable TC1
- AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK // TC1 Clock = MCK(48MHz)/2 = 24MHz
- | AT91C_TC_CPCSTOP // Stop clock on RC compare
- | AT91C_TC_EEVTEDG_RISING // Trigger on rising edge of Event
- | AT91C_TC_EEVT_TIOB // Event-Source: TIOB1 (= ssp_clk from FPGA = 13,56MHz/16)
- | AT91C_TC_ENETRG // Enable external trigger event
- | AT91C_TC_WAVESEL_UP // Upmode without automatic trigger on RC compare
- | AT91C_TC_WAVE // Waveform Mode
- | AT91C_TC_AEEVT_SET // Set TIOA1 on external event
- | AT91C_TC_ACPC_CLEAR; // Clear TIOA1 on RC Compare
- AT91C_BASE_TC1->TC_RC = 0x04; // RC Compare value = 0x04
-
- // use TC0 to count TIOA1 pulses
- AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // disable TC0
- AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_XC0 // TC0 clock = XC0 clock = TIOA1
- | AT91C_TC_WAVE // Waveform Mode
- | AT91C_TC_WAVESEL_UP // just count
- | AT91C_TC_ACPA_CLEAR // Clear TIOA0 on RA Compare
- | AT91C_TC_ACPC_SET; // Set TIOA0 on RC Compare
- AT91C_BASE_TC0->TC_RA = 1; // RA Compare value = 1; pulse width to TC2
- AT91C_BASE_TC0->TC_RC = 0; // RC Compare value = 0; increment TC2 on overflow
-
- // use TC2 to count TIOA0 pulses (giving us a 32bit counter (TC0/TC2) clocked by ssp_clk)
- AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKDIS; // disable TC2
- AT91C_BASE_TC2->TC_CMR = AT91C_TC_CLKS_XC2 // TC2 clock = XC2 clock = TIOA0
- | AT91C_TC_WAVE // Waveform Mode
- | AT91C_TC_WAVESEL_UP; // just count
-
- AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; // enable and reset TC0
- AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; // enable and reset TC1
- AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; // enable and reset TC2
-
- // synchronize the counter with the ssp_frame signal.
- // Note: FPGA must be in any iso14443 mode, otherwise the frame signal would not be present
- while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_FRAME)); // wait for ssp_frame to go high (start of frame)
- while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_FRAME); // wait for ssp_frame to be low
- while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)); // wait for ssp_clk to go high
-
- // note: up to now two ssp_clk rising edges have passed since the rising edge of ssp_frame
- // it is now safe to assert a sync signal. This sets all timers to 0 on next active clock edge
- AT91C_BASE_TCB->TCB_BCR = 1; // assert Sync (set all timers to 0 on next active clock edge)
- // at the next (3rd) ssp_clk rising edge, TC1 will be reset (and not generate a clock signal to TC0)
- // at the next (4th) ssp_clk rising edge, TC0 (the low word of our counter) will be reset. From now on,
- // whenever the last three bits of our counter go 0, we can be sure to be in the middle of a frame transfer.
- // (just started with the transfer of the 4th Bit).
-
- // 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);
-}
-void ResetSspClk(void) {
- //enable clock of timer and software trigger
- AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG;
- AT91C_BASE_TC1->TC_CCR = AT91C_TC_SWTRG;
- AT91C_BASE_TC2->TC_CCR = AT91C_TC_SWTRG;
-}
-
-uint32_t RAMFUNC GetCountSspClk(){
- 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;
-}
-
projects / proxmark3-svn / blobdiff