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 void LEDsoff() {
  78         LED_A_OFF();
  79         LED_B_OFF();
  80         LED_C_OFF();
  81         LED_D_OFF();
  82 }
  83
  84 // LEDs: R(C) O(A) G(B) -- R(D) [1, 2, 4 and 8]
  85 void LED(int led, int ms) {
  86         if (led & LED_RED)
  87                 LED_C_ON();
  88         if (led & LED_ORANGE)
  89                 LED_A_ON();
  90         if (led & LED_GREEN)
  91                 LED_B_ON();
  92         if (led & LED_RED2)
  93                 LED_D_ON();
  94
  95         if (!ms)
  96                 return;
  97
  98         SpinDelay(ms);
  99
 100         if (led & LED_RED)
 101                 LED_C_OFF();
 102         if (led & LED_ORANGE)
 103                 LED_A_OFF();
 104         if (led & LED_GREEN)
 105                 LED_B_OFF();
 106         if (led & LED_RED2)
 107                 LED_D_OFF();
 108 }
 109
 110 // Determine if a button is double clicked, single clicked,
 111 // not clicked, or held down (for ms || 1sec)
 112 // In general, don't use this function unless you expect a
 113 // double click, otherwise it will waste 500ms -- use BUTTON_HELD instead
 114 int BUTTON_CLICKED(int ms) {
 115         // Up to 500ms in between clicks to mean a double click
 116         int ticks = (48000 * (ms ? ms : 1000)) >> 10;
 117
 118         // If we're not even pressed, forget about it!
 119         if (!BUTTON_PRESS())
 120                 return BUTTON_NO_CLICK;
 121
 122         // Borrow a PWM unit for my real-time clock
 123         AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
 124         // 48 MHz / 1024 gives 46.875 kHz
 125         AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
 126         AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
 127         AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
 128
 129         uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 130
 131         int letoff = 0;
 132         for(;;)
 133         {
 134                 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 135
 136                 // We haven't let off the button yet
 137                 if (!letoff)
 138                 {
 139                         // We just let it off!
 140                         if (!BUTTON_PRESS())
 141                         {
 142                                 letoff = 1;
 143
 144                                 // reset our timer for 500ms
 145                                 start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 146                                 ticks = (48000 * (500)) >> 10;
 147                         }
 148
 149                         // Still haven't let it off
 150                         else
 151                                 // Have we held down a full second?
 152                                 if (now == (uint16_t)(start + ticks))
 153                                         return BUTTON_HOLD;
 154                 }
 155
 156                 // We already let off, did we click again?
 157                 else
 158                         // Sweet, double click!
 159                         if (BUTTON_PRESS())
 160                                 return BUTTON_DOUBLE_CLICK;
 161
 162                         // Have we ran out of time to double click?
 163                         else
 164                                 if (now == (uint16_t)(start + ticks))
 165                                         // At least we did a single click
 166                                         return BUTTON_SINGLE_CLICK;
 167
 168                 WDT_HIT();
 169         }
 170
 171         // We should never get here
 172         return BUTTON_ERROR;
 173 }
 174
 175 // Determine if a button is held down
 176 int BUTTON_HELD(int ms) {
 177         // If button is held for one second
 178         int ticks = (48000 * (ms ? ms : 1000)) >> 10;
 179
 180         // If we're not even pressed, forget about it!
 181         if (!BUTTON_PRESS())
 182                 return BUTTON_NO_CLICK;
 183
 184         // Borrow a PWM unit for my real-time clock
 185         AT91C_BASE_PWMC->PWMC_ENA = PWM_CHANNEL(0);
 186         // 48 MHz / 1024 gives 46.875 kHz
 187         AT91C_BASE_PWMC_CH0->PWMC_CMR = PWM_CH_MODE_PRESCALER(10);
 188         AT91C_BASE_PWMC_CH0->PWMC_CDTYR = 0;
 189         AT91C_BASE_PWMC_CH0->PWMC_CPRDR = 0xffff;
 190
 191         uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 192
 193         for(;;)
 194         {
 195                 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
 196
 197                 // As soon as our button let go, we didn't hold long enough
 198                 if (!BUTTON_PRESS())
 199                         return BUTTON_SINGLE_CLICK;
 200
 201                 // Have we waited the full second?
 202                 else
 203                         if (now == (uint16_t)(start + ticks))
 204                                 return BUTTON_HOLD;
 205
 206                 WDT_HIT();
 207         }
 208
 209         // We should never get here
 210         return BUTTON_ERROR;
 211 }
 212
 213 /* Similar to FpgaGatherVersion this formats stored version information
 214  * into a string representation. It takes a pointer to the struct version_information,
 215  * verifies the magic properties, then stores a formatted string, prefixed by
 216  * prefix in dst.
 217  */
 218 void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information) {
 219         struct version_information *v = (struct version_information*)version_information;
 220         dst[0] = 0;
 221         strncat(dst, prefix, len-1);
 222         if(v->magic != VERSION_INFORMATION_MAGIC) {
 223                 strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
 224                 return;
 225         }
 226         if(v->versionversion != 1) {
 227                 strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
 228                 return;
 229         }
 230         if(!v->present) {
 231                 strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
 232                 return;
 233         }
 234
 235         strncat(dst, v->gitversion, len - strlen(dst) - 1);
 236         if(v->clean == 0) {
 237                 strncat(dst, "-unclean", len - strlen(dst) - 1);
 238         } else if(v->clean == 2) {
 239                 strncat(dst, "-suspect", len - strlen(dst) - 1);
 240         }
 241
 242         strncat(dst, " ", len - strlen(dst) - 1);
 243         strncat(dst, v->buildtime, len - strlen(dst) - 1);
 244         strncat(dst, "\n", len - strlen(dst) - 1);
 245 }