Simple single-color 8x8x8 LED Cube with AVRs
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  1. /*
  2. * eq.c
  3. *
  4. * Copyright 2012 Thomas Buck <xythobuz@me.com>
  5. *
  6. * This file is part of LED-Cube.
  7. *
  8. * LED-Cube is free software: you can redistribute it and/or modify
  9. * it under the terms of the GNU General Public License as published by
  10. * the Free Software Foundation, either version 3 of the License, or
  11. * (at your option) any later version.
  12. *
  13. * LED-Cube is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public License
  19. * along with LED-Cube. If not, see <http://www.gnu.org/licenses/>.
  20. */
  21. #include <avr/io.h>
  22. #include <stdint.h>
  23. #include <util/delay.h>
  24. #include "eq.h"
  25. #include "adc.h"
  26. #define Trs 72
  27. #define Ts 19
  28. #define To 36
  29. uint8_t result[7] = {128, 128, 128, 128, 128, 128, 128};
  30. #define RESETPORT PORTC
  31. #define STROBEPORT PORTC
  32. #define RESET PC3
  33. #define STROBE PC2
  34. #define RESETON RESETPORT |= (1 << RESET)
  35. #define RESETOFF RESETPORT &= ~(1 << RESET)
  36. #define STROBEON STROBEPORT |= (1 << STROBE)
  37. #define STROBEOFF STROBEPORT &= ~(1 << STROBE)
  38. void equalizerInit(void);
  39. uint8_t *equalizerGet(void);
  40. void calcMultiplicator(uint8_t *d);
  41. uint8_t getOffset(void);
  42. void equalizerInit(void) {
  43. RESETON;
  44. STROBEOFF;
  45. }
  46. uint8_t *equalizerGet(void) {
  47. uint8_t i;
  48. RESETOFF;
  49. _delay_us(Trs);
  50. for (i = 0; i < 7; i++) {
  51. STROBEON;
  52. _delay_us(Ts);
  53. STROBEOFF;
  54. _delay_us(To); // Wait for result
  55. adcStartConversion(0);
  56. result[i] = adcGetByte();
  57. }
  58. RESETON;
  59. calcMultiplicator(result); // Multiply with Poti Position
  60. return result;
  61. }
  62. void calcMultiplicator(uint8_t *d) {
  63. uint8_t i;
  64. uint16_t multiplicator = ((uint16_t)getOffset() + 100) / 10; // From 10 to 36
  65. uint16_t temp;
  66. for (i = 0; i < 7; i++) {
  67. // Had some problems with 8bit and 16bit arithmetic, cutting some numbers.
  68. // Thats why it is a bit more verbose than really necessary...
  69. temp = d[i];
  70. temp = temp * multiplicator / 10; // From 0 to 918
  71. if (temp > 255) {
  72. d[i] = 255;
  73. } else {
  74. d[i] = (uint8_t)temp;
  75. }
  76. }
  77. }
  78. uint8_t getOffset(void) {
  79. adcStartConversion(0x01);
  80. return adcGetByte();
  81. }