iclass.c: speeding up MAC calculation

[proxmark3-svn] / armsrc / util.c

diff --git a/armsrc/util.c b/armsrc/util.c
index a1b0f1518b98e417d6c07217412bf2a746e54dc5..aac68a344f74ddd9bca70e9015a03a8851d86127 100644 (file)
--- a/armsrc/util.c
+++ b/armsrc/util.c
@@ -89,6 +89,22 @@ void LEDsoff()
        LED_D_OFF();
 }
 
+void LEDson()
+{
+       LED_A_ON();
+       LED_B_ON();
+       LED_C_ON();
+       LED_D_ON();
+}
+
+void LEDsinvert()
+{
+       LED_A_INV();
+       LED_B_INV();
+       LED_C_INV();
+       LED_D_INV();
+}
+
 // LEDs: R(C) O(A) G(B) -- R(D) [1, 2, 4 and 8]
 void LED(int led, int ms)
 {
@@ -373,13 +389,13 @@ void StartCountSspClk()
        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_EEVT_TIOB                    // Event-Source: TIOB1 (= ssp_clk from FPGA = 13,56MHz/16 ... 13,56MHz/4)
                                                        | 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
+       AT91C_BASE_TC1->TC_RC = 0x02;                                                   // RC Compare value = 0x02
 
        // use TC0 to count TIOA1 pulses
        AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS;                               // disable TC0
@@ -402,7 +418,7 @@ 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 iso14443 mode, otherwise SSC_FRAME and SSC_CLK signals would not be present 
+       // synchronize the counter with the ssp_frame signal. Note: FPGA must be in a FPGA mode with SSC transfer, 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
@@ -430,15 +446,15 @@ void ResetSspClk(void) {
 }
 
 
-uint32_t RAMFUNC GetCountSspClk(){
-       uint32_t tmp_count;
-       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);
-       } 
-       else {
-               return tmp_count;
-       }
+uint32_t GetCountSspClk(){
+       uint32_t hi, lo;
+
+       do {
+               hi = AT91C_BASE_TC2->TC_CV;
+               lo = AT91C_BASE_TC0->TC_CV;
+       } while(hi != AT91C_BASE_TC2->TC_CV);
+
+       return (hi << 16) | lo;
 }