output_pt8211.h 2.4KB

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  1. /* Audio Library for Teensy 3.X
  2. * Copyright (c) 2016, Paul Stoffregen, paul@pjrc.com
  3. *
  4. * Development of this audio library was funded by PJRC.COM, LLC by sales of
  5. * Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
  6. * open source software by purchasing Teensy or other PJRC products.
  7. *
  8. * Permission is hereby granted, free of charge, to any person obtaining a copy
  9. * of this software and associated documentation files (the "Software"), to deal
  10. * in the Software without restriction, including without limitation the rights
  11. * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12. * copies of the Software, and to permit persons to whom the Software is
  13. * furnished to do so, subject to the following conditions:
  14. *
  15. * The above copyright notice, development funding notice, and this permission
  16. * notice shall be included in all copies or substantial portions of the Software.
  17. *
  18. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23. * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24. * THE SOFTWARE.
  25. */
  26. //Adapted to PT8211, Frank Bösing.
  27. #ifndef output_pt8211_h_
  28. #define output_pt8211_h_
  29. //uncomment to enable oversampling:
  30. #define AUDIO_PT8211_OVERSAMPLING
  31. //uncomment ONE of these to define interpolation type for oversampling:
  32. // #define AUDIO_PT8211_INTERPOLATION_LINEAR
  33. #define AUDIO_PT8211_INTERPOLATION_CIC
  34. #include "Arduino.h"
  35. #include "AudioStream.h"
  36. #include "DMAChannel.h"
  37. class AudioOutputPT8211 : public AudioStream
  38. {
  39. public:
  40. AudioOutputPT8211(void) : AudioStream(2, inputQueueArray) { begin(); }
  41. virtual void update(void);
  42. void begin(void);
  43. protected:
  44. static void config_i2s(void);
  45. static audio_block_t *block_left_1st;
  46. static audio_block_t *block_right_1st;
  47. static bool update_responsibility;
  48. static DMAChannel dma;
  49. static void isr(void)
  50. #if defined(AUDIO_PT8211_OVERSAMPLING)
  51. __attribute__((optimize("unroll-loops")))
  52. #endif
  53. ;
  54. private:
  55. static audio_block_t *block_left_2nd;
  56. static audio_block_t *block_right_2nd;
  57. static uint16_t block_left_offset;
  58. static uint16_t block_right_offset;
  59. audio_block_t *inputQueueArray[2];
  60. };
  61. #endif