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  1. /* Audio Library for Teensy 3.X
  2. * Copyright (c) 2014, 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. #ifndef synth_waveform_h_
  27. #define synth_waveform_h_
  28. #include "AudioStream.h"
  29. #include "arm_math.h"
  30. // waveforms.c
  31. extern "C" {
  32. extern const int16_t AudioWaveformSine[257];
  33. }
  34. #define AUDIO_SAMPLE_RATE_ROUNDED (44118)
  35. #define DELAY_PASSTHRU -1
  36. #define TONE_TYPE_SINE 0
  37. #define TONE_TYPE_SAWTOOTH 1
  38. #define TONE_TYPE_SQUARE 2
  39. #define TONE_TYPE_TRIANGLE 3
  40. class AudioSynthWaveform :
  41. public AudioStream
  42. {
  43. public:
  44. AudioSynthWaveform(void) :
  45. AudioStream(0,NULL),
  46. tone_freq(0), tone_phase(0), tone_incr(0), tone_type(0)
  47. {
  48. }
  49. void frequency(float t_hi)
  50. {
  51. if (t_hi > AUDIO_SAMPLE_RATE_EXACT / 2 || t_hi < 0.0) return;
  52. tone_incr = ((0x80000000LL*t_hi)/AUDIO_SAMPLE_RATE_EXACT) + 0.5;
  53. }
  54. void amplitude(float n) { // 0 to 1.0
  55. if (n < 0) n = 0;
  56. else if (n > 1.0) n = 1.0;
  57. // Ramp code
  58. if(tone_amp && (n == 0)) {
  59. last_tone_amp = tone_amp;
  60. }
  61. else if((tone_amp == 0) && n) {
  62. // reset the phase when the amplitude was zero
  63. // and has now been increased.
  64. tone_phase = 0;
  65. }
  66. // set new magnitude
  67. tone_amp = n * 32767.0;
  68. }
  69. boolean begin(float t_amp,float t_hi,short t_type);
  70. virtual void update(void);
  71. private:
  72. short tone_amp;
  73. short last_tone_amp;
  74. short tone_freq;
  75. uint32_t tone_phase;
  76. // volatile prevents the compiler optimizing out the frequency function
  77. volatile uint32_t tone_incr;
  78. short tone_type;
  79. };
  80. #endif