Simple single-color 8x8x8 LED Cube with AVRs
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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. #include <avr/io.h>
  24. #include <avr/interrupt.h>
  25. #include <stdlib.h>
  26. #include "uart.h"
  27. #include "cube.h"
  28. #ifndef F_CPU
  29. #define F_CPU 16000000L
  30. #endif
  31. volatile uint8_t _isrCounter = 0;
  32. volatile uint8_t **imgBuffer = NULL; // imgBuffer[8][8]
  33. volatile uint8_t changedFlag = 0;
  34. volatile uint8_t imgFlag = 0;
  35. volatile uint8_t layer = 0;
  36. inline void delay_ns(int16_t ns);
  37. inline void isrCall(void);
  38. void setImage(uint8_t **img) {
  39. uint8_t i = 0, j;
  40. changedFlag = 1;
  41. for (; i < 8; i++) {
  42. for (j = 0; j < 8; j++) {
  43. imgBuffer[i][j] = img[i][j];
  44. }
  45. }
  46. }
  47. uint8_t isFinished(void) {
  48. return imgFlag;
  49. }
  50. void init(void) {
  51. uint8_t ctr = 0;
  52. DDRD = 0xFF; // Mosfets as Output
  53. DDRB = 0xFF;
  54. DDRC = 0xFF; // Latch Enable
  55. DDRA = 0xFF; // Latch Data
  56. TCCR1A |= (1 << WGM12); // CTC Mode
  57. TCCR1B |= (1 << CS10); // No prescaler
  58. OCR1A = 3968;
  59. TIMSK = (1 << OCIE1A); // Enable Overflow Interrupt
  60. // We just assume this works, because after reset,
  61. // enough Memory should be available...
  62. imgBuffer = malloc(8 * sizeof(uint8_t*));
  63. for(ctr = 0; ctr < 8; ctr++) {
  64. // Same reasoning here...
  65. imgBuffer[ctr] = malloc(8 * sizeof(uint8_t));
  66. }
  67. sei(); // Enable Interrupts
  68. }
  69. void close(void) {
  70. uint8_t ctr = 0;
  71. for (; ctr < 8; ctr++) {
  72. free((uint8_t *)imgBuffer[ctr]);
  73. }
  74. free(imgBuffer);
  75. TIMSK &= ~(1 << OCIE1A); // Disable interrupt
  76. }
  77. // Count to 3968 21 times...
  78. ISR(TIMER1_COMPA_vect) {
  79. if (_isrCounter < 20) {
  80. _isrCounter++;
  81. } else {
  82. _isrCounter = 0;
  83. isrCall();
  84. }
  85. }
  86. // Data is sent to 8 Fet bits...
  87. inline void setFet(uint8_t data) {
  88. PORTD = (data & ~(3)); // Doesn't interfere with serial communication...
  89. PORTB &= ~(24);
  90. PORTB |= ((data << 3) & 24);
  91. }
  92. // Give id of latch, 0 - 7
  93. inline void selectLatch(uint8_t latchNr) {
  94. PORTC = 0;
  95. if (latchNr < 8) {
  96. PORTC = 1 << latchNr;
  97. }
  98. }
  99. inline void setLatch(uint8_t latchNr, uint8_t data) {
  100. setFet(0); // All LEDs off
  101. selectLatch(latchNr); // Activate current latch
  102. PORTA = data; // Put latch data
  103. delay_ns(LATCHDELAY); // Wait for latch
  104. selectLatch(8); // Deactivate all latches
  105. setFet(1 << latchNr); // Activate current plane
  106. }
  107. inline void isrCall(void) {
  108. uint8_t latchCtr = 0;
  109. if (changedFlag != 0) {
  110. // The picture changed. Restart!
  111. layer = 0;
  112. imgFlag = 0;
  113. changedFlag = 0;
  114. }
  115. for (; latchCtr < 8; latchCtr++) {
  116. setLatch(latchCtr, imgBuffer[layer][latchCtr]); // Put out all the data
  117. }
  118. // Select next layer
  119. if (layer < 7) {
  120. layer++;
  121. } else {
  122. layer = 0;
  123. imgFlag = 1; // Finished
  124. }
  125. }
  126. inline void delay_ns(int16_t ns) {
  127. // minimum 63 nanoseconds (= 1 tick)
  128. for (;ns > 0; ns -= 63)
  129. asm volatile("nop"::);
  130. }