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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 }
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