Simple single-color 8x8x8 LED Cube with AVRs
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adc.c 1.6KB

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  1. /*
  2. * adc.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 <stdint.h>
  25. #include "adc.h"
  26. void adcInit(void) {
  27. ADMUX = 0;
  28. ADMUX |= (1 << REFS0); // Ref. Voltage: Vcc
  29. ADCSRA |= (1 << ADPS2) | (1 << ADPS0); // Prescaler 64
  30. ADCSRA |= (1 << ADEN); // Enable adc
  31. adcStartConversion(0);
  32. adcGetResult();
  33. }
  34. void adcStartConversion(uint8_t channel) {
  35. ADMUX &= 0xF0; // Clear channel selection bits
  36. ADMUX |= (channel & 0x0F); // Set channel
  37. ADCSRA |= (1 << ADSC); // start conversion
  38. }
  39. uint8_t adcIsFinished(void) {
  40. // Return 1 if ADSC is 0
  41. if (ADCSRA & (1 << ADSC)) {
  42. return 0;
  43. } else {
  44. return 1;
  45. }
  46. }
  47. uint16_t adcGetResult(void) {
  48. while (adcIsFinished() == 0);
  49. ADCSRA &= ~(1 << ADSC);
  50. return ADCW;
  51. }
  52. uint8_t adcGetByte(void) {
  53. uint16_t tmp = adcGetResult();
  54. tmp = tmp >> 2;
  55. return tmp;
  56. }