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 size_t nbytes(size_t nbits) {
  13         return (nbits >> 3)+((nbits % 8) > 0);
  14 }
  15
  16 uint32_t SwapBits(uint32_t value, int nrbits) {
  17         uint32_t newvalue = 0;
  18         for(int i = 0; i < nrbits; i++) {
  19                 newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
  20         }
  21         return newvalue;
  22 }
  23
  24 /*
  25  ref  http://www.csm.ornl.gov/~dunigan/crc.html
  26  Returns the value v with the bottom b [0,32] bits reflected.
  27  Example: reflect(0x3e23L,3) == 0x3e26
  28 */
  29 uint32_t reflect(uint32_t v, int b) {
  30         uint32_t t = v;
  31         for ( int i = 0; i < b; ++i) {
  32                 if (t & 1)
  33                         v |=  BITMASK((b-1)-i);
  34                 else
  35                         v &= ~BITMASK((b-1)-i);
  36                 t >>= 1;
  37         }
  38         return v;
  39 }
  40
  41 void num_to_bytes(uint64_t n, size_t len, uint8_t* dest) {
  42         while (len--) {
  43                 dest[len] = (uint8_t) n;
  44                 n >>= 8;
  45         }
  46 }
  47
  48 uint64_t bytes_to_num(uint8_t* src, size_t len) {
  49         uint64_t num = 0;
  50         while (len--) {
  51                 num = (num << 8) | (*src);
  52                 src++;
  53         }
  54         return num;
  55 }
  56
  57 // RotateLeft - Ultralight, Desfire
  58 void rol(uint8_t *data, const size_t len) {
  59     uint8_t first = data[0];
  60     for (size_t i = 0; i < len-1; i++) {
  61         data[i] = data[i+1];
  62     }
  63     data[len-1] = first;
  64 }
  65
  66 void lsl (uint8_t *data, size_t len) {
  67     for (size_t n = 0; n < len - 1; n++) {
  68         data[n] = (data[n] << 1) | (data[n+1] >> 7);
  69     }
  70     data[len - 1] <<= 1;
  71 }
  72
  73 int32_t le24toh (uint8_t data[3]) {
  74     return (data[2] << 16) | (data[1] << 8) | data[0];
  75 }
  76
  77 //convert hex digit to integer
  78 uint8_t hex2int(char hexchar){
  79     switch(hexchar){
  80         case '0': return 0; break;
  81         case '1': return 1; break;
  82         case '2': return 2; break;
  83         case '3': return 3; break;
  84         case '4': return 4; break;
  85         case '5': return 5; break;
  86         case '6': return 6; break;
  87         case '7': return 7; break;
  88         case '8': return 8; break;
  89         case '9': return 9; break;
  90         case 'a':
  91         case 'A': return 10; break;
  92         case 'b':
  93                 case 'B': return 11; break;
  94         case 'c':
  95         case 'C': return 12; break;
  96         case 'd':
  97                 case 'D': return 13; break;
  98         case 'e':
  99         case 'E': return 14; break;
 100         case 'f':
 101         case 'F': return 15; break;
 102         default:
 103             return 0;
 104     }
 105 }
 106
 107 void LEDsoff() {
 108         LED_A_OFF();
 109         LED_B_OFF();
 110         LED_C_OFF();
 111         LED_D_OFF();
 112 }
 113
 114 // LEDs: R(C) O(A) G(B) -- R(D) [1, 2, 4 and 8]
 115 void LED(int led, int ms) {
 116         if (led & LED_RED)
 117                 LED_C_ON();
 118         if (led & LED_ORANGE)
 119                 LED_A_ON();
 120         if (led & LED_GREEN)
 121                 LED_B_ON();
 122         if (led & LED_RED2)
 123                 LED_D_ON();
 124
 125         if (!ms)
 126                 return;
 127
 128         SpinDelay(ms);
 129
 130         if (led & LED_RED)
 131                 LED_C_OFF();
 132         if (led & LED_ORANGE)
 133                 LED_A_OFF();
 134         if (led & LED_GREEN)
 135                 LED_B_OFF();
 136         if (led & LED_RED2)
 137                 LED_D_OFF();
 138 }
 139
 140 // Determine if a button is double clicked, single clicked,
 141 // not clicked, or held down (for ms || 1sec)
 142 // In general, don't use this function unless you expect a
 143 // double click, otherwise it will waste 500ms -- use BUTTON_HELD instead
 144 int BUTTON_CLICKED(int ms) {
 145         // Up to 500ms in between clicks to mean a double click
 146         int ticks = (48000 * (ms ? ms : 1000)) >> 10;
 147
 148         // If we're not even pressed, forget about it!
 149         if (!BUTTON_PRESS())
 150                 return BUTTON_NO_CLICK;
 151
 152         // Borrow a PWM unit for my real-time clock
 153         AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
 154         // 48 MHz / 1024 gives 46.875 kHz
 155         AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
 156         AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
 157         AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
 158
 159         uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 160
 161         int letoff = 0;
 162         for(;;)
 163         {
 164                 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 165
 166                 // We haven't let off the button yet
 167                 if (!letoff)
 168                 {
 169                         // We just let it off!
 170                         if (!BUTTON_PRESS())
 171                         {
 172                                 letoff = 1;
 173
 174                                 // reset our timer for 500ms
 175                                 start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 176                                 ticks = (48000 * (500)) >> 10;
 177                         }
 178
 179                         // Still haven't let it off
 180                         else
 181                                 // Have we held down a full second?
 182                                 if (now == (uint16_t)(start + ticks))
 183                                         return BUTTON_HOLD;
 184                 }
 185
 186                 // We already let off, did we click again?
 187                 else
 188                         // Sweet, double click!
 189                         if (BUTTON_PRESS())
 190                                 return BUTTON_DOUBLE_CLICK;
 191
 192                         // Have we ran out of time to double click?
 193                         else
 194                                 if (now == (uint16_t)(start + ticks))
 195                                         // At least we did a single click
 196                                         return BUTTON_SINGLE_CLICK;
 197
 198                 WDT_HIT();
 199         }
 200
 201         // We should never get here
 202         return BUTTON_ERROR;
 203 }
 204
 205 // Determine if a button is held down
 206 int BUTTON_HELD(int ms) {
 207         // If button is held for one second
 208         int ticks = (48000 * (ms ? ms : 1000)) >> 10;
 209
 210         // If we're not even pressed, forget about it!
 211         if (!BUTTON_PRESS())
 212                 return BUTTON_NO_CLICK;
 213
 214         // Borrow a PWM unit for my real-time clock
 215         AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
 216         // 48 MHz / 1024 gives 46.875 kHz
 217         AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
 218         AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
 219         AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
 220
 221         uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 222
 223         for(;;)
 224         {
 225                 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 226
 227                 // As soon as our button let go, we didn't hold long enough
 228                 if (!BUTTON_PRESS())
 229                         return BUTTON_SINGLE_CLICK;
 230
 231                 // Have we waited the full second?
 232                 else
 233                         if (now == (uint16_t)(start + ticks))
 234                                 return BUTTON_HOLD;
 235
 236                 WDT_HIT();
 237         }
 238
 239         // We should never get here
 240         return BUTTON_ERROR;
 241 }
 242
 243 /* Similar to FpgaGatherVersion this formats stored version information
 244  * into a string representation. It takes a pointer to the struct version_information,
 245  * verifies the magic properties, then stores a formatted string, prefixed by
 246  * prefix in dst.
 247  */
 248 void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information) {
 249         struct version_information *v = (struct version_information*)version_information;
 250         dst[0] = 0;
 251         strncat(dst, prefix, len-1);
 252         if(v->magic != VERSION_INFORMATION_MAGIC) {
 253                 strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
 254                 return;
 255         }
 256         if(v->versionversion != 1) {
 257                 strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
 258                 return;
 259         }
 260         if(!v->present) {
 261                 strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
 262                 return;
 263         }
 264
 265         strncat(dst, v->gitversion, len - strlen(dst) - 1);
 266         if(v->clean == 0) {
 267                 strncat(dst, "-unclean", len - strlen(dst) - 1);
 268         } else if(v->clean == 2) {
 269                 strncat(dst, "-suspect", len - strlen(dst) - 1);
 270         }
 271
 272         strncat(dst, " ", len - strlen(dst) - 1);
 273         strncat(dst, v->buildtime, len - strlen(dst) - 1);
 274         strncat(dst, "\n", len - strlen(dst) - 1);
 275 }