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e30c654b 1//-----------------------------------------------------------------------------
e30c654b 2// Jonathan Westhues, Sept 2005
bd20f8f4 3//
4// This code is licensed to you under the terms of the GNU GPL, version 2 or,
5// at your option, any later version. See the LICENSE.txt file for the text of
6// the license.
7//-----------------------------------------------------------------------------
8// Utility functions used in many places, not specific to any piece of code.
e30c654b 9//-----------------------------------------------------------------------------
bd20f8f4 10
e30c654b 11#include "proxmark3.h"
f7e3ed82 12#include "util.h"
9ab7a6c7 13#include "string.h"
9492e0b0 14#include "apps.h"
e30c654b 15
195af472 16size_t nbytes(size_t nbits) {
17 return (nbits/8)+((nbits%8)>0);
18}
19
81cd0474 20uint32_t SwapBits(uint32_t value, int nrbits) {
21 int i;
22 uint32_t newvalue = 0;
23 for(i = 0; i < nrbits; i++) {
24 newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
25 }
26 return newvalue;
27}
28
f7e3ed82 29void num_to_bytes(uint64_t n, size_t len, uint8_t* dest)
e30c654b 30{
31 while (len--) {
f7e3ed82 32 dest[len] = (uint8_t) n;
e30c654b 33 n >>= 8;
34 }
35}
36
f7e3ed82 37uint64_t bytes_to_num(uint8_t* src, size_t len)
e30c654b 38{
39 uint64_t num = 0;
40 while (len--)
41 {
42 num = (num << 8) | (*src);
43 src++;
44 }
45 return num;
46}
47
48void LEDsoff()
49{
50 LED_A_OFF();
51 LED_B_OFF();
52 LED_C_OFF();
53 LED_D_OFF();
54}
55
56// LEDs: R(C) O(A) G(B) -- R(D) [1, 2, 4 and 8]
57void LED(int led, int ms)
58{
59 if (led & LED_RED)
60 LED_C_ON();
61 if (led & LED_ORANGE)
62 LED_A_ON();
63 if (led & LED_GREEN)
64 LED_B_ON();
65 if (led & LED_RED2)
66 LED_D_ON();
67
68 if (!ms)
69 return;
70
71 SpinDelay(ms);
72
73 if (led & LED_RED)
74 LED_C_OFF();
75 if (led & LED_ORANGE)
76 LED_A_OFF();
77 if (led & LED_GREEN)
78 LED_B_OFF();
79 if (led & LED_RED2)
80 LED_D_OFF();
81}
82
83
84// Determine if a button is double clicked, single clicked,
85// not clicked, or held down (for ms || 1sec)
86// In general, don't use this function unless you expect a
87// double click, otherwise it will waste 500ms -- use BUTTON_HELD instead
88int BUTTON_CLICKED(int ms)
89{
90 // Up to 500ms in between clicks to mean a double click
91 int ticks = (48000 * (ms ? ms : 1000)) >> 10;
92
93 // If we're not even pressed, forget about it!
94 if (!BUTTON_PRESS())
95 return BUTTON_NO_CLICK;
96
97 // Borrow a PWM unit for my real-time clock
98 AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
99 // 48 MHz / 1024 gives 46.875 kHz
100 AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
101 AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
102 AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
103
f7e3ed82 104 uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 105
106 int letoff = 0;
107 for(;;)
108 {
f7e3ed82 109 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 110
111 // We haven't let off the button yet
112 if (!letoff)
113 {
114 // We just let it off!
115 if (!BUTTON_PRESS())
116 {
117 letoff = 1;
118
119 // reset our timer for 500ms
120 start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
121 ticks = (48000 * (500)) >> 10;
122 }
123
124 // Still haven't let it off
125 else
126 // Have we held down a full second?
f7e3ed82 127 if (now == (uint16_t)(start + ticks))
e30c654b 128 return BUTTON_HOLD;
129 }
130
131 // We already let off, did we click again?
132 else
133 // Sweet, double click!
134 if (BUTTON_PRESS())
135 return BUTTON_DOUBLE_CLICK;
136
137 // Have we ran out of time to double click?
138 else
f7e3ed82 139 if (now == (uint16_t)(start + ticks))
e30c654b 140 // At least we did a single click
141 return BUTTON_SINGLE_CLICK;
142
143 WDT_HIT();
144 }
145
146 // We should never get here
147 return BUTTON_ERROR;
148}
149
150// Determine if a button is held down
151int BUTTON_HELD(int ms)
152{
153 // If button is held for one second
154 int ticks = (48000 * (ms ? ms : 1000)) >> 10;
155
156 // If we're not even pressed, forget about it!
157 if (!BUTTON_PRESS())
158 return BUTTON_NO_CLICK;
159
160 // Borrow a PWM unit for my real-time clock
161 AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
162 // 48 MHz / 1024 gives 46.875 kHz
163 AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
164 AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
165 AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
166
f7e3ed82 167 uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 168
169 for(;;)
170 {
f7e3ed82 171 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 172
173 // As soon as our button let go, we didn't hold long enough
174 if (!BUTTON_PRESS())
175 return BUTTON_SINGLE_CLICK;
176
177 // Have we waited the full second?
178 else
f7e3ed82 179 if (now == (uint16_t)(start + ticks))
e30c654b 180 return BUTTON_HOLD;
181
182 WDT_HIT();
183 }
184
185 // We should never get here
186 return BUTTON_ERROR;
187}
188
189// attempt at high resolution microsecond timer
190// beware: timer counts in 21.3uS increments (1024/48Mhz)
191void SpinDelayUs(int us)
192{
193 int ticks = (48*us) >> 10;
194
195 // Borrow a PWM unit for my real-time clock
196 AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
197 // 48 MHz / 1024 gives 46.875 kHz
198 AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
199 AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
200 AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
201
f7e3ed82 202 uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 203
204 for(;;) {
f7e3ed82 205 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
206 if (now == (uint16_t)(start + ticks))
e30c654b 207 return;
208
209 WDT_HIT();
210 }
211}
212
213void SpinDelay(int ms)
214{
215 // convert to uS and call microsecond delay function
216 SpinDelayUs(ms*1000);
217}
218
219/* Similar to FpgaGatherVersion this formats stored version information
220 * into a string representation. It takes a pointer to the struct version_information,
221 * verifies the magic properties, then stores a formatted string, prefixed by
222 * prefix in dst.
223 */
224void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information)
225{
226 struct version_information *v = (struct version_information*)version_information;
227 dst[0] = 0;
2ed270a8 228 strncat(dst, prefix, len-1);
e30c654b 229 if(v->magic != VERSION_INFORMATION_MAGIC) {
cba867f2 230 strncat(dst, "Missing/Invalid version information", len - strlen(dst) - 1);
e30c654b 231 return;
232 }
233 if(v->versionversion != 1) {
cba867f2 234 strncat(dst, "Version information not understood", len - strlen(dst) - 1);
e30c654b 235 return;
236 }
237 if(!v->present) {
cba867f2 238 strncat(dst, "Version information not available", len - strlen(dst) - 1);
e30c654b 239 return;
240 }
241
cba867f2 242 strncat(dst, v->gitversion, len - strlen(dst) - 1);
e30c654b 243 if(v->clean == 0) {
cba867f2 244 strncat(dst, "-unclean", len - strlen(dst) - 1);
e30c654b 245 } else if(v->clean == 2) {
cba867f2 246 strncat(dst, "-suspect", len - strlen(dst) - 1);
e30c654b 247 }
248
cba867f2
MHS
249 strncat(dst, " ", len - strlen(dst) - 1);
250 strncat(dst, v->buildtime, len - strlen(dst) - 1);
e30c654b 251}
9ca155ba
M
252
253// -------------------------------------------------------------------------
254// timer lib
255// -------------------------------------------------------------------------
256// test procedure:
257//
258// ti = GetTickCount();
259// SpinDelay(1000);
260// ti = GetTickCount() - ti;
261// Dbprintf("timer(1s): %d t=%d", ti, GetTickCount());
262
263void StartTickCount()
264{
265// must be 0x40, but on my cpu - included divider is optimal
266// 0x20 - 1 ms / bit
267// 0x40 - 2 ms / bit
268
0a39986e 269 AT91C_BASE_RTTC->RTTC_RTMR = AT91C_RTTC_RTTRST + 0x001D; // was 0x003B
9ca155ba
M
270}
271
272/*
273* Get the current count.
274*/
275uint32_t RAMFUNC GetTickCount(){
8f51ddb0 276 return AT91C_BASE_RTTC->RTTC_RTVR;// was * 2;
9ca155ba
M
277}
278
8f51ddb0
M
279// -------------------------------------------------------------------------
280// microseconds timer
281// -------------------------------------------------------------------------
282void StartCountUS()
283{
284 AT91C_BASE_PMC->PMC_PCER |= (0x1 << 12) | (0x1 << 13) | (0x1 << 14);
285// AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC1XC1S_TIOA0;
286 AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_TIOA0 | AT91C_TCB_TC2XC2S_NONE;
287
288 // fast clock
289 AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable
290 AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK | // MCK(48MHz)/32 -- tick=1.5mks
291 AT91C_TC_WAVE | AT91C_TC_WAVESEL_UP_AUTO | AT91C_TC_ACPA_CLEAR |
292 AT91C_TC_ACPC_SET | AT91C_TC_ASWTRG_SET;
293 AT91C_BASE_TC0->TC_RA = 1;
294 AT91C_BASE_TC0->TC_RC = 0xBFFF + 1; // 0xC000
295
296 AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; // timer disable
297 AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_XC1; // from timer 0
1c611bbd 298
8f51ddb0
M
299 AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN;
300 AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN;
301 AT91C_BASE_TCB->TCB_BCR = 1;
1c611bbd 302 }
8f51ddb0
M
303
304uint32_t RAMFUNC GetCountUS(){
305 return (AT91C_BASE_TC1->TC_CV * 0x8000) + ((AT91C_BASE_TC0->TC_CV / 15) * 10);
306}
307
308static uint32_t GlobalUsCounter = 0;
309
310uint32_t RAMFUNC GetDeltaCountUS(){
311 uint32_t g_cnt = GetCountUS();
312 uint32_t g_res = g_cnt - GlobalUsCounter;
313 GlobalUsCounter = g_cnt;
314 return g_res;
315}
316
317
1c611bbd 318// -------------------------------------------------------------------------
7bc95e2e 319// Timer for iso14443 commands. Uses ssp_clk from FPGA
1c611bbd 320// -------------------------------------------------------------------------
7bc95e2e 321void StartCountSspClk()
1c611bbd 322{
323 AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC0) | (1 << AT91C_ID_TC1) | (1 << AT91C_ID_TC2); // Enable Clock to all timers
324 AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_TIOA1 // XC0 Clock = TIOA1
325 | AT91C_TCB_TC1XC1S_NONE // XC1 Clock = none
326 | AT91C_TCB_TC2XC2S_TIOA0; // XC2 Clock = TIOA0
327
328 // configure TC1 to create a short pulse on TIOA1 when a rising edge on TIOB1 (= ssp_clk from FPGA) occurs:
329 AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKDIS; // disable TC1
330 AT91C_BASE_TC1->TC_CMR = AT91C_TC_CLKS_TIMER_DIV1_CLOCK // TC1 Clock = MCK(48MHz)/2 = 24MHz
331 | AT91C_TC_CPCSTOP // Stop clock on RC compare
332 | AT91C_TC_EEVTEDG_RISING // Trigger on rising edge of Event
7bc95e2e 333 | AT91C_TC_EEVT_TIOB // Event-Source: TIOB1 (= ssp_clk from FPGA = 13,56MHz/16)
1c611bbd 334 | AT91C_TC_ENETRG // Enable external trigger event
335 | AT91C_TC_WAVESEL_UP // Upmode without automatic trigger on RC compare
336 | AT91C_TC_WAVE // Waveform Mode
337 | AT91C_TC_AEEVT_SET // Set TIOA1 on external event
338 | AT91C_TC_ACPC_CLEAR; // Clear TIOA1 on RC Compare
339 AT91C_BASE_TC1->TC_RC = 0x04; // RC Compare value = 0x04
340
341 // use TC0 to count TIOA1 pulses
7bc95e2e 342 AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // disable TC0
1c611bbd 343 AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_XC0 // TC0 clock = XC0 clock = TIOA1
344 | AT91C_TC_WAVE // Waveform Mode
345 | AT91C_TC_WAVESEL_UP // just count
346 | AT91C_TC_ACPA_CLEAR // Clear TIOA0 on RA Compare
347 | AT91C_TC_ACPC_SET; // Set TIOA0 on RC Compare
348 AT91C_BASE_TC0->TC_RA = 1; // RA Compare value = 1; pulse width to TC2
349 AT91C_BASE_TC0->TC_RC = 0; // RC Compare value = 0; increment TC2 on overflow
350
351 // use TC2 to count TIOA0 pulses (giving us a 32bit counter (TC0/TC2) clocked by ssp_clk)
352 AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKDIS; // disable TC2
353 AT91C_BASE_TC2->TC_CMR = AT91C_TC_CLKS_XC2 // TC2 clock = XC2 clock = TIOA0
354 | AT91C_TC_WAVE // Waveform Mode
355 | AT91C_TC_WAVESEL_UP; // just count
356
1c611bbd 357 AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKEN; // enable TC0
358 AT91C_BASE_TC1->TC_CCR = AT91C_TC_CLKEN; // enable TC1
359 AT91C_BASE_TC2->TC_CCR = AT91C_TC_CLKEN; // enable TC2
9492e0b0 360
7bc95e2e 361 //
362 // synchronize the counter with the ssp_frame signal. Note: FPGA must be in any iso14446 mode, otherwise the frame signal would not be present
363 //
364 while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_FRAME)); // wait for ssp_frame to go high (start of frame)
9492e0b0 365 while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_FRAME); // wait for ssp_frame to be low
7bc95e2e 366 while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)); // wait for ssp_clk to go high
367 // note: up to now two ssp_clk rising edges have passed since the rising edge of ssp_frame
368 // it is now safe to assert a sync signal. This sets all timers to 0 on next active clock edge
1c611bbd 369 AT91C_BASE_TCB->TCB_BCR = 1; // assert Sync (set all timers to 0 on next active clock edge)
7bc95e2e 370 // at the next (3rd) ssp_clk rising edge, TC1 will be reset (and not generate a clock signal to TC0)
371 // at the next (4th) ssp_clk rising edge, TC0 (the low word of our counter) will be reset. From now on,
372 // whenever the last three bits of our counter go 0, we can be sure to be in the middle of a frame transfer.
373 // (just started with the transfer of the 4th Bit).
374 // The high word of the counter (TC2) will not reset until the low word (TC0) overflows. Therefore need to wait quite some time before
375 // we can use the counter.
376 while (AT91C_BASE_TC0->TC_CV < 0xFFF0);
1c611bbd 377}
378
379
7bc95e2e 380uint32_t RAMFUNC GetCountSspClk(){
1c611bbd 381 uint32_t tmp_count;
382 tmp_count = (AT91C_BASE_TC2->TC_CV << 16) | AT91C_BASE_TC0->TC_CV;
7bc95e2e 383 if ((tmp_count & 0x0000ffff) == 0) { //small chance that we may have missed an increment in TC2
1c611bbd 384 return (AT91C_BASE_TC2->TC_CV << 16);
385 }
386 else {
387 return tmp_count;
388 }
389}
7bc95e2e 390
391
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