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. // Uses Timer 1!
  24. #include <avr/io.h>
  25. #include <avr/interrupt.h>
  26. #include <stdlib.h>
  27. #include <util/atomic.h>
  28. #ifdef DEBUG
  29. #include "serial.h"
  30. #include "strings.h"
  31. #endif
  32. #include "cube.h"
  33. #ifndef F_CPU
  34. #define F_CPU 16000000L
  35. #endif
  36. // Should be 41666
  37. #define COUNT 41666
  38. /*
  39. * We have:
  40. * Fosc / prescaler / fps / interruptsPerFrame = interruptCount
  41. * 16000000 / 1 / 24 / 8 = 83333 (round-a-bout)
  42. * That means, 192 Interrupts per second, 1920 after 10 secs!
  43. *
  44. * Small Study: Interrupt count after 10 seconds
  45. *
  46. * |-------------------------------|
  47. * | COUNT | 1 | 41666 | |
  48. * |----------|------|-------|-----|
  49. * | intcount | 2451 | 2451 | |
  50. * |-------------------------------|
  51. *
  52. * Haha, what's up with that?
  53. */
  54. volatile uint8_t imgBuffer[8][8];
  55. volatile uint8_t changedFlag = 0;
  56. volatile uint8_t imgFlag = 0;
  57. volatile uint8_t layer = 0;
  58. inline void isrCall(void);
  59. volatile uint32_t timesTriggered = 0;
  60. volatile uint8_t warningDisplayed = 0;
  61. uint32_t getTriggerCount(void) {
  62. return timesTriggered;
  63. }
  64. void setImage(uint8_t *img) {
  65. uint8_t i, j;
  66. ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
  67. changedFlag = 1;
  68. imgFlag = 0;
  69. for (i = 0; i < 8; i++) {
  70. for (j = 0; j < 8; j++) {
  71. imgBuffer[i][j] = ~(img[j + (i * 8)]);
  72. }
  73. }
  74. }
  75. }
  76. void fillBuffer(uint8_t val) {
  77. uint8_t i, j;
  78. ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
  79. changedFlag = 1;
  80. imgFlag = 0;
  81. for (i = 0; i < 8; i++) {
  82. for (j = 0; j < 8; j++) {
  83. imgBuffer[i][j] = ~(val);
  84. }
  85. }
  86. }
  87. }
  88. uint8_t isFinished(void) {
  89. return imgFlag;
  90. }
  91. void initCube(void) {
  92. TCCR1B |= (1 << CS10) | (1 << WGM12); // Prescaler: 1, CTC Mode
  93. OCR1A = COUNT;
  94. TIMSK = (1 << OCIE1A); // Enable Output Compare Interrupt
  95. }
  96. void close(void) {
  97. TIMSK &= ~(1 << OCIE1A); // Disable interrupt
  98. }
  99. ISR(TIMER1_COMPA_vect) {
  100. isrCall();
  101. timesTriggered++;
  102. #ifdef DEBUG
  103. if (TIFR & TOV1) {
  104. if (warningDisplayed) {
  105. serialWrite('!');
  106. } else {
  107. serialWriteString(getString(27));
  108. warningDisplayed++;
  109. }
  110. TIFR |= (1 << TOV1); // Clear flag
  111. }
  112. #endif
  113. }
  114. // Data is sent to 8 Fet bits...
  115. inline void setFet(uint8_t data) {
  116. PORTD = (data & ~(3)); // Doesn't interfere with serial communication...
  117. PORTB = (PORTB & ~(24)) | ((data << 3) & 24);
  118. }
  119. // Give id of latch, 0 - 7
  120. inline void selectLatch(uint8_t latchNr) {
  121. PORTC = 0;
  122. if (latchNr < 8) {
  123. PORTC = 1 << latchNr;
  124. }
  125. }
  126. inline void setLatch(uint8_t latchNr, uint8_t data) {
  127. selectLatch(latchNr); // Activate current latch
  128. PORTA = data; // Put latch data
  129. asm volatile("nop"::); // Wait for latch
  130. }
  131. inline void isrCall(void) {
  132. uint8_t latchCtr = 0;
  133. if (changedFlag != 0) {
  134. // The picture changed. Restart!
  135. layer = 0;
  136. changedFlag = 0;
  137. }
  138. setFet(0);
  139. for (; latchCtr < 8; latchCtr++) {
  140. setLatch(latchCtr, imgBuffer[layer][latchCtr]); // Put out all the data
  141. }
  142. setFet(1 << layer);
  143. // Select next layer
  144. if (layer < 7) {
  145. layer++;
  146. } else {
  147. layer = 0;
  148. imgFlag++; // Finished
  149. }
  150. }