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
  11 #include "util.h"
  12
  13 void print_result(char *name, uint8_t *buf, size_t len) {
  14         uint8_t *p = buf;
  15
  16         if ( len % 16 == 0 ) {
  17                 for(; p-buf < len; p += 16)
  18                         Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
  19                                 name,
  20                                 p-buf,
  21                                 len,
  22                                 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]
  23                         );
  24         }
  25         else {
  26                 for(; p-buf < len; p += 8)
  27                         Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x",
  28                                 name,
  29                                 p-buf,
  30                                 len,
  31                                 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
  32         }
  33 }
  34
  35 size_t nbytes(size_t nbits) {
  36         return (nbits >> 3)+((nbits % 8) > 0);
  37 }
  38
  39 uint32_t SwapBits(uint32_t value, int nrbits) {
  40         uint32_t newvalue = 0;
  41         for(int i = 0; i < nrbits; i++) {
  42                 newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
  43         }
  44         return newvalue;
  45 }
  46
  47 /*
  48  ref  http://www.csm.ornl.gov/~dunigan/crc.html
  49  Returns the value v with the bottom b [0,32] bits reflected.
  50  Example: reflect(0x3e23L,3) == 0x3e26
  51 */
  52 uint32_t reflect(uint32_t v, int b) {
  53         uint32_t t = v;
  54         for ( int i = 0; i < b; ++i) {
  55                 if (t & 1)
  56                         v |=  BITMASK((b-1)-i);
  57                 else
  58                         v &= ~BITMASK((b-1)-i);
  59                 t >>= 1;
  60         }
  61         return v;
  62 }
  63
  64 void num_to_bytes(uint64_t n, size_t len, uint8_t* dest) {
  65         while (len--) {
  66                 dest[len] = (uint8_t) n;
  67                 n >>= 8;
  68         }
  69 }
  70
  71 uint64_t bytes_to_num(uint8_t* src, size_t len) {
  72         uint64_t num = 0;
  73         while (len--) {
  74                 num = (num << 8) | (*src);
  75                 src++;
  76         }
  77         return num;
  78 }
  79
  80 // RotateLeft - Ultralight, Desfire
  81 void rol(uint8_t *data, const size_t len) {
  82     uint8_t first = data[0];
  83     for (size_t i = 0; i < len-1; i++) {
  84         data[i] = data[i+1];
  85     }
  86     data[len-1] = first;
  87 }
  88
  89 void lsl (uint8_t *data, size_t len) {
  90     for (size_t n = 0; n < len - 1; n++) {
  91         data[n] = (data[n] << 1) | (data[n+1] >> 7);
  92     }
  93     data[len - 1] <<= 1;
  94 }
  95
  96 int32_t le24toh (uint8_t data[3]) {
  97     return (data[2] << 16) | (data[1] << 8) | data[0];
  98 }
  99
 100 void LEDsoff() {
 101         LED_A_OFF();
 102         LED_B_OFF();
 103         LED_C_OFF();
 104         LED_D_OFF();
 105 }
 106
 107 // LEDs: R(C) O(A) G(B) -- R(D) [1, 2, 4 and 8]
 108 void LED(int led, int ms) {
 109         if (led & LED_RED)
 110                 LED_C_ON();
 111         if (led & LED_ORANGE)
 112                 LED_A_ON();
 113         if (led & LED_GREEN)
 114                 LED_B_ON();
 115         if (led & LED_RED2)
 116                 LED_D_ON();
 117
 118         if (!ms)
 119                 return;
 120
 121         SpinDelay(ms);
 122
 123         if (led & LED_RED)
 124                 LED_C_OFF();
 125         if (led & LED_ORANGE)
 126                 LED_A_OFF();
 127         if (led & LED_GREEN)
 128                 LED_B_OFF();
 129         if (led & LED_RED2)
 130                 LED_D_OFF();
 131 }
 132
 133 // Determine if a button is double clicked, single clicked,
 134 // not clicked, or held down (for ms || 1sec)
 135 // In general, don't use this function unless you expect a
 136 // double click, otherwise it will waste 500ms -- use BUTTON_HELD instead
 137 int BUTTON_CLICKED(int ms) {
 138         // Up to 500ms in between clicks to mean a double click
 139         int ticks = (48000 * (ms ? ms : 1000)) >> 10;
 140
 141         // If we're not even pressed, forget about it!
 142         if (!BUTTON_PRESS())
 143                 return BUTTON_NO_CLICK;
 144
 145         // Borrow a PWM unit for my real-time clock
 146         AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
 147         // 48 MHz / 1024 gives 46.875 kHz
 148         AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
 149         AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
 150         AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
 151
 152         uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 153
 154         int letoff = 0;
 155         for(;;)
 156         {
 157                 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 158
 159                 // We haven't let off the button yet
 160                 if (!letoff)
 161                 {
 162                         // We just let it off!
 163                         if (!BUTTON_PRESS())
 164                         {
 165                                 letoff = 1;
 166
 167                                 // reset our timer for 500ms
 168                                 start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 169                                 ticks = (48000 * (500)) >> 10;
 170                         }
 171
 172                         // Still haven't let it off
 173                         else
 174                                 // Have we held down a full second?
 175                                 if (now == (uint16_t)(start + ticks))
 176                                         return BUTTON_HOLD;
 177                 }
 178
 179                 // We already let off, did we click again?
 180                 else
 181                         // Sweet, double click!
 182                         if (BUTTON_PRESS())
 183                                 return BUTTON_DOUBLE_CLICK;
 184
 185                         // Have we ran out of time to double click?
 186                         else
 187                                 if (now == (uint16_t)(start + ticks))
 188                                         // At least we did a single click
 189                                         return BUTTON_SINGLE_CLICK;
 190
 191                 WDT_HIT();
 192         }
 193
 194         // We should never get here
 195         return BUTTON_ERROR;
 196 }
 197
 198 // Determine if a button is held down
 199 int BUTTON_HELD(int ms) {
 200         // If button is held for one second
 201         int ticks = (48000 * (ms ? ms : 1000)) >> 10;
 202
 203         // If we're not even pressed, forget about it!
 204         if (!BUTTON_PRESS())
 205                 return BUTTON_NO_CLICK;
 206
 207         // Borrow a PWM unit for my real-time clock
 208         AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
 209         // 48 MHz / 1024 gives 46.875 kHz
 210         AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
 211         AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
 212         AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
 213
 214         uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 215
 216         for(;;)
 217         {
 218                 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 219
 220                 // As soon as our button let go, we didn't hold long enough
 221                 if (!BUTTON_PRESS())
 222                         return BUTTON_SINGLE_CLICK;
 223
 224                 // Have we waited the full second?
 225                 else
 226                         if (now == (uint16_t)(start + ticks))
 227                                 return BUTTON_HOLD;
 228
 229                 WDT_HIT();
 230         }
 231
 232         // We should never get here
 233         return BUTTON_ERROR;
 234 }
 235
 236 /* Similar to FpgaGatherVersion this formats stored version information
 237  * into a string representation. It takes a pointer to the struct version_information,
 238  * verifies the magic properties, then stores a formatted string, prefixed by
 239  * prefix in dst.
 240  */
 241 void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information) {
 242         struct version_information *v = (struct version_information*)version_information;
 243         dst[0] = 0;
 244         strncat(dst, prefix, len-1);
 245         if(v->magic != VERSION_INFORMATION_MAGIC) {
 246                 strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
 247                 return;
 248         }
 249         if(v->versionversion != 1) {
 250                 strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
 251                 return;
 252         }
 253         if(!v->present) {
 254                 strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
 255                 return;
 256         }
 257
 258         strncat(dst, v->gitversion, len - strlen(dst) - 1);
 259         if(v->clean == 0) {
 260                 strncat(dst, "-unclean", len - strlen(dst) - 1);
 261         } else if(v->clean == 2) {
 262                 strncat(dst, "-suspect", len - strlen(dst) - 1);
 263         }
 264
 265         strncat(dst, " ", len - strlen(dst) - 1);
 266         strncat(dst, v->buildtime, len - strlen(dst) - 1);
 267         strncat(dst, "\n", len - strlen(dst) - 1);
 268 }