Correction to Samyrun offline mode

[proxmark3-svn] / armsrc / util.c

diff --git a/armsrc/util.c b/armsrc/util.c
index be41bad8aa2a351a8d9ef059aecc1e6104921c2a..8a8d66576d4172e2611bf5d156bb340ce4087c58 100644 (file)
--- 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);
 }
 
 
@@ -431,6 +446,99 @@ 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.
@@ -446,4 +554,3 @@ uint32_t prand() {
        next_random = next_random * 6364136223846793005 + 1;
        return (uint32_t)(next_random >> 32) % 0xffffffff;
 }
-