Simple single-color 8x8x8 LED Cube with AVRs
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time.c 1.5KB

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  1. /*
  2. * time.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 <stdlib.h>
  24. #include <stdint.h>
  25. #include <avr/io.h>
  26. #include <avr/interrupt.h>
  27. #include "time.h"
  28. // Interrupt:
  29. // Prescaler 256
  30. // Count to 208
  31. // Execute every 3 times
  32. // => 1 Interrupt per millisecond
  33. volatile uint64_t systemTime = 0; // Overflows in 500 million years... :)
  34. volatile uint8_t isrCounter = 0;
  35. void initSystemTimer() {
  36. TCCR0 |= (1 << WGM01) | (1 << CS02); // Prescaler: 256, CTC Mode
  37. OCR0 = 208;
  38. TIMSK |= (1 << TOIE0); // Enable overflow interrupt
  39. }
  40. ISR(TIMER0_OVF_vect) {
  41. if (isrCounter >= 2) {
  42. isrCounter = 0;
  43. systemTime++;
  44. } else {
  45. isrCounter++;
  46. }
  47. }
  48. uint64_t getSystemTime() {
  49. return systemTime;
  50. }