X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/7f0d5926362d50ed01ea04af95a1e03777fce47c..48c32f043677bfb614f368617a3255ee976d161d:/armsrc/util.c diff --git a/armsrc/util.c b/armsrc/util.c index 1dd8dc75..8a8d6657 100644 --- a/armsrc/util.c +++ b/armsrc/util.c @@ -292,6 +292,7 @@ void FormatVersionInformation(char *dst, int len, const char *prefix, void *vers strncat(dst, "\n", len - strlen(dst) - 1); } + // ------------------------------------------------------------------------- // timer lib // ------------------------------------------------------------------------- @@ -312,6 +313,7 @@ void StartTickCount() // note: worst case precision is approx 2.5% } + /* * Get the current count. */ @@ -319,6 +321,7 @@ uint32_t RAMFUNC GetTickCount(){ return AT91C_BASE_RTTC->RTTC_RTVR;// was * 2; } + // ------------------------------------------------------------------------- // microseconds timer // ------------------------------------------------------------------------- @@ -344,10 +347,12 @@ void StartCountUS() AT91C_BASE_TCB->TCB_BCR = 1; } + uint32_t RAMFUNC GetCountUS(){ - return (AT91C_BASE_TC1->TC_CV * 0x8000) + ((AT91C_BASE_TC0->TC_CV / 15) * 10); + return (AT91C_BASE_TC1->TC_CV * 0x8000) + ((AT91C_BASE_TC0->TC_CV * 2) / 3); //was /15) * 10); } + static uint32_t GlobalUsCounter = 0; uint32_t RAMFUNC GetDeltaCountUS(){ @@ -402,7 +407,7 @@ void StartCountSspClk() AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKEN; // enable TC2 // - // synchronize the counter with the ssp_frame signal. Note: FPGA must be in any iso14446 mode, otherwise the frame signal would not be present + // synchronize the counter with the ssp_frame signal. Note: FPGA must be in any iso14443 mode, otherwise SSC_FRAME and SSC_CLK signals 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 @@ -416,7 +421,17 @@ void StartCountSspClk() // (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_TC0->TC_CV < 0xFFF0); + while (AT91C_BASE_TC0->TC_CV < 0xFFFF); + // Note: needs one more SSP_CLK cycle (1.18 us) until TC2 resets. Don't call GetCountSspClk() that soon. +} + + +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); } @@ -431,3 +446,111 @@ 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 + 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; + + // disable TC0 and TC1 for re-configuration + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; + + // first configure TC1 (higher, 0xFFFF0000) 16 bit counter + AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_XC1; // just connect to TIOA0 from TC0 + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; // re-enable timer and wait for TC0 + + // second configure TC0 (lower, 0x0000FFFF) 16 bit counter + 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 | // RA comperator clears TIOA (carry bit) + AT91C_TC_ACPC_SET | // RC comperator sets TIOA (carry bit) + AT91C_TC_ASWTRG_SET; // SWTriger sets TIOA (carry bit) + AT91C_BASE_TC0->TC_RC = 0; // set TIOA (carry bit) on overflow, return to zero + AT91C_BASE_TC0->TC_RA = 1; // clear carry bit on next clock cycle + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; // reset and re-enable timer + + // synchronized startup procedure + while (AT91C_BASE_TC0->TC_CV > 0); // wait until TC0 returned to zero + while (AT91C_BASE_TC0->TC_CV < 2); // and has started (TC_CV > TC_RA, now TC1 is cleared) + + // return to zero + AT91C_BASE_TC1->TC_CCR = AT91C_TC_SWTRG; + AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG; + while (AT91C_BASE_TC0->TC_CV > 0); +} + + +uint32_t GetTicks(void) { + uint32_t hi, lo; + + do { + hi = AT91C_BASE_TC1->TC_CV; + lo = AT91C_BASE_TC0->TC_CV; + } while(hi != AT91C_BASE_TC1->TC_CV); + + return (hi << 16) | lo; +} + + +// Wait - Spindelay in ticks. +// if called with a high number, this will trigger the WDT... +void WaitTicks(uint32_t ticks){ + if ( ticks == 0 ) return; + ticks += GetTicks(); + while (GetTicks() < ticks); +} + + +// Wait / Spindelay in us (microseconds) +// 1us = 1.5ticks. +void WaitUS(uint16_t us){ + WaitTicks( (uint32_t)us * 3 / 2 ) ; +} + + +void WaitMS(uint16_t ms){ + WaitTicks( (uint32_t)ms * 1500 ); +} + + +// Starts Clock and waits until its reset +void ResetTicks(void){ + AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + while (AT91C_BASE_TC0->TC_CV > 0); +} + + +void ResetTimer(AT91PS_TC timer){ + timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + 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; +} + + +static uint64_t next_random = 1; + +/* Generates a (non-cryptographically secure) 32-bit random number. + * + * We don't have an implementation of the "rand" function or a clock to seed it + * with, so we just call GetTickCount the first time to seed ourselves. + */ +uint32_t prand() { + if (next_random == 1) { + next_random = GetTickCount(); + } + + next_random = next_random * 6364136223846793005 + 1; + return (uint32_t)(next_random >> 32) % 0xffffffff; +}