Simple single-color 8x8x8 LED Cube with AVRs
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cube.c 5.6KB

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  1. /*
  2. * cube.c
  3. *
  4. * Copyright 2011 Thomas Buck <xythobuz@me.com>
  5. * Copyright 2011 Max Nuding <max.nuding@gmail.com>
  6. * Copyright 2011 Felix Bäder <baeder.felix@gmail.com>
  7. *
  8. * This file is part of LED-Cube.
  9. *
  10. * LED-Cube is free software: you can redistribute it and/or modify
  11. * it under the terms of the GNU General Public License as published by
  12. * the Free Software Foundation, either version 3 of the License, or
  13. * (at your option) any later version.
  14. *
  15. * LED-Cube is distributed in the hope that it will be useful,
  16. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18. * GNU General Public License for more details.
  19. *
  20. * You should have received a copy of the GNU General Public License
  21. * along with LED-Cube. If not, see <http://www.gnu.org/licenses/>.
  22. */
  23. // Uses Timer 1!
  24. #include <avr/io.h>
  25. #include <avr/interrupt.h>
  26. #include <stdlib.h>
  27. #include <util/atomic.h>
  28. #include <avr/pgmspace.h>
  29. #include "cube.h"
  30. #ifndef F_CPU
  31. #define F_CPU 16000000L
  32. #endif
  33. /*
  34. * 24 fps, 8 layers => 192 Interrupts per second
  35. * We are at 16MHz, so we count to:
  36. * 16000000 / 192 = 83333,33...
  37. * We can only count to 2^16, therefore we have a second counter
  38. * COUNT * (COUNT2 + 1) = Realcount
  39. * 41666 * 2 = 83332
  40. * This is flickering really hard.
  41. *
  42. * COUNT2 set to 0 on the other hand, thus producing 48fps,
  43. * works flicker-free. Now we just return imgFlag / 2 as isFinished(),
  44. * so we still fake 24fps for the main program...
  45. */
  46. #define COUNT 41666
  47. #define COUNT2 0
  48. volatile uint8_t imgBuffer[8][8];
  49. volatile uint8_t changedFlag = 0;
  50. volatile uint8_t imgFlag = 0;
  51. volatile uint8_t layer = 0;
  52. volatile uint8_t toggleFlag = 0;
  53. volatile uint32_t timesTriggered = 0;
  54. volatile uint8_t warningDisplayed = 0;
  55. // A fix for our mirrored 64pin cable.
  56. uint8_t lookUp[256] PROGMEM = { 0, 64, 128, 192, 16, 80, 144, 208, 32, 96, 160,
  57. 224, 48, 112, 176, 240, 4, 68, 132, 196, 20,
  58. 84, 148, 212, 36, 100, 164, 228, 52, 116, 180,
  59. 244, 8, 72, 136, 200, 24, 88, 152, 216, 40,
  60. 104, 168, 232, 56, 120, 184, 248, 12, 76, 140,
  61. 204, 28, 92, 156, 220, 44, 108, 172, 236, 60,
  62. 124, 188, 252, 1, 65, 129, 193, 17, 81, 145,
  63. 209, 33, 97, 161, 225, 49, 113, 177, 241, 5,
  64. 69, 133, 197, 21, 85, 149, 213, 37, 101, 165,
  65. 229, 53, 117, 181, 245, 9, 73, 137, 201, 25,
  66. 89, 153, 217, 41, 105, 169, 233, 57, 121, 185,
  67. 249, 13, 77, 141, 205, 29, 93, 157, 221, 45,
  68. 109, 173, 237, 61, 125, 189, 253, 2, 66, 130,
  69. 194, 18, 82, 146, 210, 34, 98, 162, 226, 50,
  70. 114, 178, 242, 6, 70, 134, 198, 22, 86, 150,
  71. 214, 38, 102, 166, 230, 54, 118, 182, 246, 10,
  72. 74, 138, 202, 26, 90, 154, 218, 42, 106, 170,
  73. 234, 58, 122, 186, 250, 14, 78, 142, 206, 30,
  74. 94, 158, 222, 46, 110, 174, 238, 62, 126, 190,
  75. 254, 3, 67, 131, 195, 19, 83, 147, 211, 35,
  76. 99, 163, 227, 51, 115, 179, 243, 7, 71, 135,
  77. 199, 23, 87, 151, 215, 39, 103, 167, 231, 55,
  78. 119, 183, 247, 11, 75, 139, 203, 27, 91, 155,
  79. 219, 43, 107, 171, 235, 59, 123, 187, 251, 15,
  80. 79, 143, 207, 31, 95, 159, 223, 47, 111, 175,
  81. 239, 63, 127, 191, 255 };
  82. ISR(TIMER1_COMPA_vect) {
  83. uint8_t latchCtr;
  84. if (toggleFlag >= COUNT2) {
  85. if (changedFlag != 0) {
  86. // The picture changed. Restart!
  87. layer = 0;
  88. changedFlag = 0;
  89. }
  90. PORTD = 0;
  91. PORTB &= ~(24); // Disable all Fets
  92. for (latchCtr = 0; latchCtr < 8; latchCtr++) {
  93. // Disable all latches
  94. PORTC &= ~(0xFC); // 2 - 7
  95. PORTB &= ~(6); // 0 & 1
  96. PORTA = imgBuffer[layer][latchCtr]; // Put latch data
  97. // Enable desired latch
  98. if (latchCtr > 1) {
  99. PORTC |= (1 << latchCtr);
  100. } else {
  101. PORTB |= (1 << (latchCtr + 1));
  102. }
  103. }
  104. // Set FET
  105. PORTD = (1 << layer); // PD2 to 7
  106. PORTB = (PORTB & ~(24)) | (((1 << layer) << 3) & 24); // PB3 & 4
  107. // Select next layer
  108. if (layer < 7) {
  109. layer++;
  110. } else {
  111. layer = 0;
  112. imgFlag++; // Finished
  113. }
  114. toggleFlag = 0;
  115. timesTriggered++;
  116. } else {
  117. toggleFlag++;
  118. }
  119. }
  120. uint32_t getTriggerCount(void) {
  121. return timesTriggered;
  122. }
  123. void setImage(uint8_t *img) {
  124. uint8_t i, j;
  125. ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
  126. changedFlag = 1;
  127. imgFlag = 0;
  128. toggleFlag = 0;
  129. for (i = 0; i < 8; i++) {
  130. for (j = 0; j < 8; j++) {
  131. imgBuffer[j][7 - i] = ~(pgm_read_byte(&(lookUp[img[j + (i * 8)]])));
  132. }
  133. }
  134. }
  135. }
  136. void fillBuffer(uint8_t val) {
  137. uint8_t i, j;
  138. ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
  139. changedFlag = 1;
  140. imgFlag = 0;
  141. toggleFlag = 0;
  142. for (i = 0; i < 8; i++) {
  143. for (j = 0; j < 8; j++) {
  144. imgBuffer[i][j] = ~(val);
  145. }
  146. }
  147. }
  148. }
  149. uint8_t isFinished(void) {
  150. return (imgFlag / 2);
  151. }
  152. void initCube(void) {
  153. uint8_t x, y;
  154. TCCR1B |= (1 << CS10) | (1 << WGM12); // Prescaler: 1, CTC Mode
  155. OCR1A = COUNT;
  156. TIMSK = (1 << OCIE1A); // Enable Output Compare Interrupt
  157. fillBuffer(0); // Clear memory
  158. sei(); // Enable interrupts
  159. // Show test animation
  160. for (x = 0; x < 8; x++) {
  161. for (y = 0; y < 8; y++) {
  162. ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
  163. imgBuffer[x][y] &= ~(0xFF); // Set a pixel
  164. changedFlag = 1;
  165. imgFlag = 0;
  166. toggleFlag = COUNT2; // Ensure next interrupts starts displaying
  167. }
  168. while(imgFlag < 1); // Wait for frame to display
  169. }
  170. }
  171. cli(); // Disable interrupts
  172. timesTriggered = 0;
  173. imgFlag = 0;
  174. toggleFlag = 0;
  175. }
  176. void close(void) {
  177. TIMSK &= ~(1 << OCIE1A); // Disable interrupt
  178. }