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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
11#include "util.h"
12
13void 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
35size_t nbytes(size_t nbits) {
36 return (nbits >> 3)+((nbits % 8) > 0);
37}
38
39uint32_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*/
52uint32_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
64void 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
71uint64_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
81void 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
89void 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
96int32_t le24toh (uint8_t data[3]) {
97 return (data[2] << 16) | (data[1] << 8) | data[0];
98}
99
100void 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]
108void 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
137int 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
199int 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 */
241void 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}
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