git.zerfleddert.de Git - proxmark3-svn/blob - armsrc/util.c

   1 //-----------------------------------------------------------------------------
   2 // Jonathan Westhues, Sept 2005
   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.
   9 //-----------------------------------------------------------------------------
  10 #include "util.h"
  11
  12 void print_result(char *name, uint8_t *buf, size_t len) {
  13         uint8_t *p = buf;
  14
  15         if ( len % 16 == 0 ) {
  16                 for(; p-buf < len; p += 16)
  17                         Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
  18                                 name,
  19                                 p-buf,
  20                                 len,
  21                                 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]
  22                         );
  23         }
  24         else {
  25                 for(; p-buf < len; p += 8)
  26                         Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x",
  27                                 name,
  28                                 p-buf,
  29                                 len,
  30                                 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
  31         }
  32 }
  33
  34 size_t nbytes(size_t nbits) {
  35         return (nbits >> 3)+((nbits % 8) > 0);
  36 }
  37
  38 uint32_t SwapBits(uint32_t value, int nrbits) {
  39         uint32_t newvalue = 0;
  40         for(int i = 0; i < nrbits; i++) {
  41                 newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
  42         }
  43         return newvalue;
  44 }
  45
  46 /*
  47  ref  http://www.csm.ornl.gov/~dunigan/crc.html
  48  Returns the value v with the bottom b [0,32] bits reflected.
  49  Example: reflect(0x3e23L,3) == 0x3e26
  50 */
  51 uint32_t reflect(uint32_t v, int b) {
  52         uint32_t t = v;
  53         for ( int i = 0; i < b; ++i) {
  54                 if (t & 1)
  55                         v |=  BITMASK((b-1)-i);
  56                 else
  57                         v &= ~BITMASK((b-1)-i);
  58                 t >>= 1;
  59         }
  60         return v;
  61 }
  62
  63 void num_to_bytes(uint64_t n, size_t len, uint8_t* dest) {
  64         while (len--) {
  65                 dest[len] = (uint8_t) n;
  66                 n >>= 8;
  67         }
  68 }
  69
  70 uint64_t bytes_to_num(uint8_t* src, size_t len) {
  71         uint64_t num = 0;
  72         while (len--) {
  73                 num = (num << 8) | (*src);
  74                 src++;
  75         }
  76         return num;
  77 }
  78
  79 // RotateLeft - Ultralight, Desfire
  80 void rol(uint8_t *data, const size_t len) {
  81     uint8_t first = data[0];
  82     for (size_t i = 0; i < len-1; i++) {
  83         data[i] = data[i+1];
  84     }
  85     data[len-1] = first;
  86 }
  87
  88 void lsl (uint8_t *data, size_t len) {
  89     for (size_t n = 0; n < len - 1; n++) {
  90         data[n] = (data[n] << 1) | (data[n+1] >> 7);
  91     }
  92     data[len - 1] <<= 1;
  93 }
  94
  95 int32_t le24toh (uint8_t data[3]) {
  96     return (data[2] << 16) | (data[1] << 8) | data[0];
  97 }
  98
  99 void LEDsoff() {
 100         LED_A_OFF();
 101         LED_B_OFF();
 102         LED_C_OFF();
 103         LED_D_OFF();
 104 }
 105
 106 // LEDs: R(C) O(A) G(B) -- R(D) [1, 2, 4 and 8]
 107 void LED(int led, int ms) {
 108         if (led & LED_RED)
 109                 LED_C_ON();
 110         if (led & LED_ORANGE)
 111                 LED_A_ON();
 112         if (led & LED_GREEN)
 113                 LED_B_ON();
 114         if (led & LED_RED2)
 115                 LED_D_ON();
 116
 117         if (!ms)
 118                 return;
 119
 120         SpinDelay(ms);
 121
 122         if (led & LED_RED)
 123                 LED_C_OFF();
 124         if (led & LED_ORANGE)
 125                 LED_A_OFF();
 126         if (led & LED_GREEN)
 127                 LED_B_OFF();
 128         if (led & LED_RED2)
 129                 LED_D_OFF();
 130 }
 131
 132 // Determine if a button is double clicked, single clicked,
 133 // not clicked, or held down (for ms || 1sec)
 134 // In general, don't use this function unless you expect a
 135 // double click, otherwise it will waste 500ms -- use BUTTON_HELD instead
 136 int BUTTON_CLICKED(int ms) {
 137         // Up to 500ms in between clicks to mean a double click
 138         int ticks = (48000 * (ms ? ms : 1000)) >> 10;
 139
 140         // If we're not even pressed, forget about it!
 141         if (!BUTTON_PRESS())
 142                 return BUTTON_NO_CLICK;
 143
 144         // Borrow a PWM unit for my real-time clock
 145         AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
 146         // 48 MHz / 1024 gives 46.875 kHz
 147         AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
 148         AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
 149         AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
 150
 151         uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 152
 153         int letoff = 0;
 154         for(;;)
 155         {
 156                 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 157
 158                 // We haven't let off the button yet
 159                 if (!letoff)
 160                 {
 161                         // We just let it off!
 162                         if (!BUTTON_PRESS())
 163                         {
 164                                 letoff = 1;
 165
 166                                 // reset our timer for 500ms
 167                                 start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 168                                 ticks = (48000 * (500)) >> 10;
 169                         }
 170
 171                         // Still haven't let it off
 172                         else
 173                                 // Have we held down a full second?
 174                                 if (now == (uint16_t)(start + ticks))
 175                                         return BUTTON_HOLD;
 176                 }
 177
 178                 // We already let off, did we click again?
 179                 else
 180                         // Sweet, double click!
 181                         if (BUTTON_PRESS())
 182                                 return BUTTON_DOUBLE_CLICK;
 183
 184                         // Have we ran out of time to double click?
 185                         else
 186                                 if (now == (uint16_t)(start + ticks))
 187                                         // At least we did a single click
 188                                         return BUTTON_SINGLE_CLICK;
 189
 190                 WDT_HIT();
 191         }
 192
 193         // We should never get here
 194         return BUTTON_ERROR;
 195 }
 196
 197 // Determine if a button is held down
 198 int BUTTON_HELD(int ms) {
 199         // If button is held for one second
 200         int ticks = (48000 * (ms ? ms : 1000)) >> 10;
 201
 202         // If we're not even pressed, forget about it!
 203         if (!BUTTON_PRESS())
 204                 return BUTTON_NO_CLICK;
 205
 206         // Borrow a PWM unit for my real-time clock
 207         AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
 208         // 48 MHz / 1024 gives 46.875 kHz
 209         AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
 210         AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
 211         AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
 212
 213         uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 214
 215         for(;;)
 216         {
 217                 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 218
 219                 // As soon as our button let go, we didn't hold long enough
 220                 if (!BUTTON_PRESS())
 221                         return BUTTON_SINGLE_CLICK;
 222
 223                 // Have we waited the full second?
 224                 else
 225                         if (now == (uint16_t)(start + ticks))
 226                                 return BUTTON_HOLD;
 227
 228                 WDT_HIT();
 229         }
 230
 231         // We should never get here
 232         return BUTTON_ERROR;
 233 }
 234
 235 /* Similar to FpgaGatherVersion this formats stored version information
 236  * into a string representation. It takes a pointer to the struct version_information,
 237  * verifies the magic properties, then stores a formatted string, prefixed by
 238  * prefix in dst.
 239  */
 240 void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information) {
 241         struct version_information *v = (struct version_information*)version_information;
 242         dst[0] = 0;
 243         strncat(dst, prefix, len-1);
 244         if(v->magic != VERSION_INFORMATION_MAGIC) {
 245                 strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
 246                 return;
 247         }
 248         if(v->versionversion != 1) {
 249                 strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
 250                 return;
 251         }
 252         if(!v->present) {
 253                 strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
 254                 return;
 255         }
 256
 257         strncat(dst, v->gitversion, len - strlen(dst) - 1);
 258         if(v->clean == 0) {
 259                 strncat(dst, "-unclean", len - strlen(dst) - 1);
 260         } else if(v->clean == 2) {
 261                 strncat(dst, "-suspect", len - strlen(dst) - 1);
 262         }
 263
 264         strncat(dst, " ", len - strlen(dst) - 1);
 265         strncat(dst, v->buildtime, len - strlen(dst) - 1);
 266         strncat(dst, "\n", len - strlen(dst) - 1);
 267 }