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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
ab3af4fe 77void LEDsoff() {
e30c654b 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]
ab3af4fe 85void LED(int led, int ms) {
e30c654b 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
e30c654b 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
ab3af4fe 114int BUTTON_CLICKED(int ms) {
e30c654b 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
f7e3ed82 129 uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 130
131 int letoff = 0;
132 for(;;)
133 {
f7e3ed82 134 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 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?
f7e3ed82 152 if (now == (uint16_t)(start + ticks))
e30c654b 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
f7e3ed82 164 if (now == (uint16_t)(start + ticks))
e30c654b 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
ab3af4fe 176int BUTTON_HELD(int ms) {
e30c654b 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
f7e3ed82 191 uint16_t start = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 192
193 for(;;)
194 {
f7e3ed82 195 uint16_t now = AT91C_BASE_PWMC_CH0->PWMC_CCNTR;
e30c654b 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
f7e3ed82 203 if (now == (uint16_t)(start + ticks))
e30c654b 204 return BUTTON_HOLD;
205
206 WDT_HIT();
207 }
208
209 // We should never get here
210 return BUTTON_ERROR;
211}
212
e30c654b 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 */
ab3af4fe 218void FormatVersionInformation(char *dst, int len, const char *prefix, void *version_information) {
e30c654b 219 struct version_information *v = (struct version_information*)version_information;
220 dst[0] = 0;
a61b4976 221 strncat(dst, prefix, len-1);
e30c654b 222 if(v->magic != VERSION_INFORMATION_MAGIC) {
9783989b 223 strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
e30c654b 224 return;
225 }
226 if(v->versionversion != 1) {
9783989b 227 strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
e30c654b 228 return;
229 }
230 if(!v->present) {
9783989b 231 strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
e30c654b 232 return;
233 }
234
cba867f2 235 strncat(dst, v->gitversion, len - strlen(dst) - 1);
e30c654b 236 if(v->clean == 0) {
cba867f2 237 strncat(dst, "-unclean", len - strlen(dst) - 1);
e30c654b 238 } else if(v->clean == 2) {
cba867f2 239 strncat(dst, "-suspect", len - strlen(dst) - 1);
e30c654b 240 }
241
cba867f2
MHS
242 strncat(dst, " ", len - strlen(dst) - 1);
243 strncat(dst, v->buildtime, len - strlen(dst) - 1);
9783989b 244 strncat(dst, "\n", len - strlen(dst) - 1);
e30c654b 245}
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