X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/32cfae439e0e2270638617fa09bf1026b0cf0e50..refs/pull/884/head:/armsrc/util.c
diff --git a/armsrc/util.c b/armsrc/util.c
index e6332a7b..4bff3a26 100644
--- a/armsrc/util.c
+++ b/armsrc/util.c
@@ -1,289 +1,576 @@
-//-----------------------------------------------------------------------------
-// Utility functions used in many places, not specific to any piece of code.
-// Jonathan Westhues, Sept 2005
-//-----------------------------------------------------------------------------
-#include <proxmark3.h>
-#include "apps.h"
-
-void *memcpy(void *dest, const void *src, int len)
-{
- BYTE *d = dest;
- const BYTE *s = src;
- while((len--) > 0) {
- *d = *s;
- d++;
- s++;
- }
- return dest;
-}
-
-void *memset(void *dest, int c, int len)
-{
- BYTE *d = dest;
- while((len--) > 0) {
- *d = c;
- d++;
- }
- return dest;
-}
-
-int memcmp(const void *av, const void *bv, int len)
-{
- const BYTE *a = av;
- const BYTE *b = bv;
-
- while((len--) > 0) {
- if(*a != *b) {
- return *a - *b;
- }
- a++;
- b++;
- }
- return 0;
-}
-
-int strlen(char *str)
-{
- int l = 0;
- while(*str) {
- l++;
- str++;
- }
- return l;
-}
-
-char* strncat(char *dest, const char *src, unsigned int n)
-{
- unsigned int dest_len = strlen(dest);
- unsigned int i;
-
- for (i = 0 ; i < n && src[i] != '\0' ; i++)
- dest[dest_len + i] = src[i];
- dest[dest_len + i] = '\0';
-
- return dest;
-}
-
-void num_to_bytes(uint64_t n, size_t len, byte_t* dest)
-{
- while (len--) {
- dest[len] = (byte_t) n;
- n >>= 8;
- }
-}
-
-uint64_t bytes_to_num(byte_t* src, size_t len)
-{
- uint64_t num = 0;
- while (len--)
- {
- num = (num << 8) | (*src);
- src++;
- }
- return num;
-}
-
-void LEDsoff()
-{
- LED_A_OFF();
- LED_B_OFF();
- LED_C_OFF();
- LED_D_OFF();
-}
-
-// LEDs: R(C) O(A) G(B) -- R(D) [1, 2, 4 and 8]
-void LED(int led, int ms)
-{
- if (led & LED_RED)
- LED_C_ON();
- if (led & LED_ORANGE)
- LED_A_ON();
- if (led & LED_GREEN)
- LED_B_ON();
- if (led & LED_RED2)
- LED_D_ON();
-
- if (!ms)
- return;
-
- SpinDelay(ms);
-
- if (led & LED_RED)
- LED_C_OFF();
- if (led & LED_ORANGE)
- LED_A_OFF();
- if (led & LED_GREEN)
- LED_B_OFF();
- if (led & LED_RED2)
- LED_D_OFF();
-}
-
-
-// Determine if a button is double clicked, single clicked,
-// not clicked, or held down (for ms || 1sec)
-// In general, don't use this function unless you expect a
-// double click, otherwise it will waste 500ms -- use BUTTON_HELD instead
-int BUTTON_CLICKED(int ms)
-{
- // Up to 500ms in between clicks to mean a double click
- int ticks = (48000 * (ms ? ms : 1000)) >> 10;
-
- // If we're not even pressed, forget about it!
- if (!BUTTON_PRESS())
- return BUTTON_NO_CLICK;
-
- // Borrow a PWM unit for my real-time clock
- AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
- // 48 MHz / 1024 gives 46.875 kHz
- AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
- AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
- AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
-
- WORD start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
-
- int letoff = 0;
- for(;;)
- {
- WORD now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
-
- // We haven't let off the button yet
- if (!letoff)
- {
- // We just let it off!
- if (!BUTTON_PRESS())
- {
- letoff = 1;
-
- // reset our timer for 500ms
- start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
- ticks = (48000 * (500)) >> 10;
- }
-
- // Still haven't let it off
- else
- // Have we held down a full second?
- if (now == (WORD)(start + ticks))
- return BUTTON_HOLD;
- }
-
- // We already let off, did we click again?
- else
- // Sweet, double click!
- if (BUTTON_PRESS())
- return BUTTON_DOUBLE_CLICK;
-
- // Have we ran out of time to double click?
- else
- if (now == (WORD)(start + ticks))
- // At least we did a single click
- return BUTTON_SINGLE_CLICK;
-
- WDT_HIT();
- }
-
- // We should never get here
- return BUTTON_ERROR;
-}
-
-// Determine if a button is held down
-int BUTTON_HELD(int ms)
-{
- // If button is held for one second
- int ticks = (48000 * (ms ? ms : 1000)) >> 10;
-
- // If we're not even pressed, forget about it!
- if (!BUTTON_PRESS())
- return BUTTON_NO_CLICK;
-
- // Borrow a PWM unit for my real-time clock
- AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
- // 48 MHz / 1024 gives 46.875 kHz
- AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
- AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
- AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
-
- WORD start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
-
- for(;;)
- {
- WORD now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
-
- // As soon as our button let go, we didn't hold long enough
- if (!BUTTON_PRESS())
- return BUTTON_SINGLE_CLICK;
-
- // Have we waited the full second?
- else
- if (now == (WORD)(start + ticks))
- return BUTTON_HOLD;
-
- WDT_HIT();
- }
-
- // We should never get here
- return BUTTON_ERROR;
-}
-
-// attempt at high resolution microsecond timer
-// beware: timer counts in 21.3uS increments (1024/48Mhz)
-void SpinDelayUs(int us)
-{
- int ticks = (48*us) >> 10;
-
- // Borrow a PWM unit for my real-time clock
- AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
- // 48 MHz / 1024 gives 46.875 kHz
- AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
- AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
- AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
-
- WORD start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
-
- for(;;) {
- WORD now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
- if (now == (WORD)(start + ticks))
- return;
-
- WDT_HIT();
- }
-}
-
-void SpinDelay(int ms)
-{
- // convert to uS and call microsecond delay function
- SpinDelayUs(ms*1000);
-}
-
-/* Similar to FpgaGatherVersion this formats stored version information
- * into a string representation. It takes a pointer to the struct version_information,
- * verifies the magic properties, then stores a formatted string, prefixed by
- * prefix in dst.
- */
-void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information)
-{
- struct version_information *v = (struct version_information*)version_information;
- dst[0] = 0;
- strncat(dst, prefix, len);
- if(v->magic != VERSION_INFORMATION_MAGIC) {
- strncat(dst, "Missing/Invalid version information", len);
- return;
- }
- if(v->versionversion != 1) {
- strncat(dst, "Version information not understood", len);
- return;
- }
- if(!v->present) {
- strncat(dst, "Version information not available", len);
- return;
- }
-
- strncat(dst, v->svnversion, len);
- if(v->clean == 0) {
- strncat(dst, "-unclean", len);
- } else if(v->clean == 2) {
- strncat(dst, "-suspect", len);
- }
-
- strncat(dst, " ", len);
- strncat(dst, v->buildtime, len);
-}
+//-----------------------------------------------------------------------------
+// Jonathan Westhues, Sept 2005
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// Utility functions used in many places, not specific to any piece of code.
+//-----------------------------------------------------------------------------
+
+#include "proxmark3.h"
+#include "util.h"
+#include "string.h"
+#include "apps.h"
+#include "BigBuf.h"
+
+
+
+void print_result(char *name, uint8_t *buf, size_t len) {
+ uint8_t *p = buf;
+
+ if ( len % 16 == 0 ) {
+ for(; p-buf < len; p += 16)
+ Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
+ name,
+ p-buf,
+ len,
+ p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]
+ );
+ }
+ else {
+ for(; p-buf < len; p += 8)
+ Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x", name, p-buf, len, p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
+ }
+}
+
+size_t nbytes(size_t nbits) {
+ return (nbits >> 3)+((nbits % 8) > 0);
+}
+
+uint32_t SwapBits(uint32_t value, int nrbits) {
+ int i;
+ uint32_t newvalue = 0;
+ for(i = 0; i < nrbits; i++) {
+ newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
+ }
+ return newvalue;
+}
+
+void num_to_bytes(uint64_t n, size_t len, uint8_t* dest)
+{
+ while (len--) {
+ dest[len] = (uint8_t) n;
+ n >>= 8;
+ }
+}
+
+uint64_t bytes_to_num(uint8_t* src, size_t len)
+{
+ uint64_t num = 0;
+ while (len--)
+ {
+ num = (num << 8) | (*src);
+ src++;
+ }
+ return num;
+}
+
+// RotateLeft - Ultralight, Desfire
+void rol(uint8_t *data, const size_t len){
+ uint8_t first = data[0];
+ for (size_t i = 0; i < len-1; i++) {
+ data[i] = data[i+1];
+ }
+ data[len-1] = first;
+}
+void lsl (uint8_t *data, size_t len) {
+ for (size_t n = 0; n < len - 1; n++) {
+ data[n] = (data[n] << 1) | (data[n+1] >> 7);
+ }
+ data[len - 1] <<= 1;
+}
+
+void LEDsoff()
+{
+ LED_A_OFF();
+ LED_B_OFF();
+ LED_C_OFF();
+ 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)
+{
+ if (led & LED_RED)
+ LED_C_ON();
+ if (led & LED_ORANGE)
+ LED_A_ON();
+ if (led & LED_GREEN)
+ LED_B_ON();
+ if (led & LED_RED2)
+ LED_D_ON();
+
+ if (!ms)
+ return;
+
+ SpinDelay(ms);
+
+ if (led & LED_RED)
+ LED_C_OFF();
+ if (led & LED_ORANGE)
+ LED_A_OFF();
+ if (led & LED_GREEN)
+ LED_B_OFF();
+ if (led & LED_RED2)
+ LED_D_OFF();
+}
+
+
+// Determine if a button is double clicked, single clicked,
+// not clicked, or held down (for ms || 1sec)
+// In general, don't use this function unless you expect a
+// double click, otherwise it will waste 500ms -- use BUTTON_HELD instead
+int BUTTON_CLICKED(int ms)
+{
+ // Up to 500ms in between clicks to mean a double click
+ int ticks = (48000 * (ms ? ms : 1000)) >> 10;
+
+ // If we're not even pressed, forget about it!
+ if (!BUTTON_PRESS())
+ return BUTTON_NO_CLICK;
+
+ // Borrow a PWM unit for my real-time clock
+ AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
+ // 48 MHz / 1024 gives 46.875 kHz
+ AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
+ AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
+ AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
+
+ uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
+
+ int letoff = 0;
+ for(;;)
+ {
+ uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
+
+ // We haven't let off the button yet
+ if (!letoff)
+ {
+ // We just let it off!
+ if (!BUTTON_PRESS())
+ {
+ letoff = 1;
+
+ // reset our timer for 500ms
+ start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
+ ticks = (48000 * (500)) >> 10;
+ }
+
+ // Still haven't let it off
+ else
+ // Have we held down a full second?
+ if (now == (uint16_t)(start + ticks))
+ return BUTTON_HOLD;
+ }
+
+ // We already let off, did we click again?
+ else
+ // Sweet, double click!
+ if (BUTTON_PRESS())
+ return BUTTON_DOUBLE_CLICK;
+
+ // Have we ran out of time to double click?
+ else
+ if (now == (uint16_t)(start + ticks))
+ // At least we did a single click
+ return BUTTON_SINGLE_CLICK;
+
+ WDT_HIT();
+ }
+
+ // We should never get here
+ return BUTTON_ERROR;
+}
+
+// Determine if a button is held down
+int BUTTON_HELD(int ms)
+{
+ // If button is held for one second
+ int ticks = (48000 * (ms ? ms : 1000)) >> 10;
+
+ // If we're not even pressed, forget about it!
+ if (!BUTTON_PRESS())
+ return BUTTON_NO_CLICK;
+
+ // Borrow a PWM unit for my real-time clock
+ AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
+ // 48 MHz / 1024 gives 46.875 kHz
+ AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
+ AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
+ AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
+
+ uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
+
+ for(;;)
+ {
+ uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
+
+ // As soon as our button let go, we didn't hold long enough
+ if (!BUTTON_PRESS())
+ return BUTTON_SINGLE_CLICK;
+
+ // Have we waited the full second?
+ else
+ if (now == (uint16_t)(start + ticks))
+ return BUTTON_HOLD;
+
+ WDT_HIT();
+ }
+
+ // We should never get here
+ return BUTTON_ERROR;
+}
+
+// attempt at high resolution microsecond timer
+// beware: timer counts in 21.3uS increments (1024/48Mhz)
+void SpinDelayUs(int us)
+{
+ int ticks = (48*us) >> 10;
+
+ // Borrow a PWM unit for my real-time clock
+ AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
+ // 48 MHz / 1024 gives 46.875 kHz
+ AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
+ AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
+ AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
+
+ uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
+
+ for(;;) {
+ uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
+ if (now == (uint16_t)(start + ticks))
+ return;
+
+ WDT_HIT();
+ }
+}
+
+void SpinDelay(int ms)
+{
+ // convert to uS and call microsecond delay function
+ SpinDelayUs(ms*1000);
+}
+
+/* Similar to FpgaGatherVersion this formats stored version information
+ * into a string representation. It takes a pointer to the struct version_information,
+ * verifies the magic properties, then stores a formatted string, prefixed by
+ * prefix in dst.
+ */
+void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information)
+{
+ struct version_information *v = (struct version_information*)version_information;
+ dst[0] = 0;
+ strncat(dst, prefix, len-1);
+ if(v->magic != VERSION_INFORMATION_MAGIC) {
+ strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
+ return;
+ }
+ if(v->versionversion != 1) {
+ strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
+ return;
+ }
+ if(!v->present) {
+ strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
+ return;
+ }
+
+ strncat(dst, v->gitversion, len - strlen(dst) - 1);
+ if(v->clean == 0) {
+ strncat(dst, "-unclean", len - strlen(dst) - 1);
+ } else if(v->clean == 2) {
+ strncat(dst, "-suspect", len - strlen(dst) - 1);
+ }
+
+ strncat(dst, " ", len - strlen(dst) - 1);
+ strncat(dst, v->buildtime, len - strlen(dst) - 1);
+ strncat(dst, "\n", len - strlen(dst) - 1);
+}
+
+
+// -------------------------------------------------------------------------
+// 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 * 2) / 3); //was /15) * 10);
+}
+
+
+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 ... 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 = 0x02; // RC Compare value = 0x02
+
+ // 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; // enable TC0
+ AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN; // enable TC1
+ AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKEN; // enable TC2
+
+ //
+ // 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 be low
+ 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_CLK)); // wait for ssp_clk to go high; 1st ssp_clk after start of frame
+ while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK); // wait for ssp_clk to go low;
+ while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)); // wait for ssp_clk to go high; 2nd ssp_clk after start of frame
+ if ((AT91C_BASE_SSC->SSC_RFMR & SSC_FRAME_MODE_BITS_IN_WORD(32)) == SSC_FRAME_MODE_BITS_IN_WORD(16)) {
+ while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK); // wait for ssp_clk to go low;
+ while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)); // wait for ssp_clk to go high; 3rd ssp_clk after start of frame
+ while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK); // wait for ssp_clk to go low;
+ while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)); // wait for ssp_clk to go high; 4th ssp_clk after start of frame
+ while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK); // wait for ssp_clk to go low;
+ while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)); // wait for ssp_clk to go high; 5th ssp_clk after start of frame
+ while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK); // wait for ssp_clk to go low;
+ while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)); // wait for ssp_clk to go high; 6th ssp_clk after start of 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/7th) ssp_clk rising edge, TC1 will be reset (and not generate a clock signal to TC0)
+ // at the next (4th/8th) 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 3rd 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 < 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);
+}
+
+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;
+}
+
+// -------------------------------------------------------------------------
+// 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;
+}