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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//-----------------------------------------------------------------------------
f7e3ed82 10#include "util.h"
e30c654b 11
195af472 12size_t nbytes(size_t nbits) {
665775c8 13 return (nbits >> 3)+((nbits % 8) > 0);
195af472 14}
15
81cd0474 16uint32_t SwapBits(uint32_t value, int nrbits) {
81cd0474 17 uint32_t newvalue = 0;
5192a0a6 18 for(int i = 0; i < nrbits; i++) {
81cd0474 19 newvalue ^= ((value >> i) & 1) << (nrbits - 1 - i);
20 }
21 return newvalue;
22}
23
ab3af4fe 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*/
29uint32_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);
5d15891e 36 t >>= 1;
ab3af4fe 37 }
38 return v;
39}
40
41863885 41void num_to_bytes(uint64_t n, size_t len, uint8_t* dest) {
e30c654b 42 while (len--) {
f7e3ed82 43 dest[len] = (uint8_t) n;
e30c654b 44 n >>= 8;
45 }
46}
47
41863885 48uint64_t bytes_to_num(uint8_t* src, size_t len) {
e30c654b 49 uint64_t num = 0;
2abdfa49 50 while (len--) {
e30c654b 51 num = (num << 8) | (*src);
52 src++;
53 }
54 return num;
55}
56
f38a1528 57// RotateLeft - Ultralight, Desfire
41863885 58void rol(uint8_t *data, const size_t len) {
f38a1528 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}
dd79e03a 65
f38a1528 66void 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
ab3af4fe 73int32_t le24toh (uint8_t data[3]) {
f38a1528 74 return (data[2] << 16) | (data[1] << 8) | data[0];
75}
76
3e83ff21 77//convert hex digit to integer
78uint8_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
ab3af4fe 107void LEDsoff() {
e30c654b 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]
ab3af4fe 115void LED(int led, int ms) {
e30c654b 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
e30c654b 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
ab3af4fe 144int BUTTON_CLICKED(int ms) {
e30c654b 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
f7e3ed82 159 uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 160
161 int letoff = 0;
162 for(;;)
163 {
f7e3ed82 164 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 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?
f7e3ed82 182 if (now == (uint16_t)(start + ticks))
e30c654b 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
f7e3ed82 194 if (now == (uint16_t)(start + ticks))
e30c654b 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
ab3af4fe 206int BUTTON_HELD(int ms) {
e30c654b 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
f7e3ed82 221 uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 222
223 for(;;)
224 {
f7e3ed82 225 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 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
f7e3ed82 233 if (now == (uint16_t)(start + ticks))
e30c654b 234 return BUTTON_HOLD;
235
236 WDT_HIT();
237 }
238
239 // We should never get here
240 return BUTTON_ERROR;
241}
242
e30c654b 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 */
ab3af4fe 248void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information) {
e30c654b 249 struct version_information *v = (struct version_information*)version_information;
250 dst[0] = 0;
a61b4976 251 strncat(dst, prefix, len-1);
e30c654b 252 if(v->magic != VERSION_INFORMATION_MAGIC) {
9783989b 253 strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
e30c654b 254 return;
255 }
256 if(v->versionversion != 1) {
9783989b 257 strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
e30c654b 258 return;
259 }
260 if(!v->present) {
9783989b 261 strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
e30c654b 262 return;
263 }
264
cba867f2 265 strncat(dst, v->gitversion, len - strlen(dst) - 1);
e30c654b 266 if(v->clean == 0) {
cba867f2 267 strncat(dst, "-unclean", len - strlen(dst) - 1);
e30c654b 268 } else if(v->clean == 2) {
cba867f2 269 strncat(dst, "-suspect", len - strlen(dst) - 1);
e30c654b 270 }
271
cba867f2
MHS
272 strncat(dst, " ", len - strlen(dst) - 1);
273 strncat(dst, v->buildtime, len - strlen(dst) - 1);
9783989b 274 strncat(dst, "\n", len - strlen(dst) - 1);
e30c654b 275}
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