46 lines
3.0 KiB
C++
46 lines
3.0 KiB
C++
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#pragma once
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#include <inttypes.h>
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#include <avr/pgmspace.h>
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inline const float SIN[] = {
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0.000000, 0.024541, 0.049068, 0.073565, 0.098017, 0.122411, 0.146730, 0.170962, 0.195090, 0.219101, 0.242980, 0.266713, 0.290285, 0.313682, 0.336890, 0.359895,
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0.382683, 0.405241, 0.427555, 0.449611, 0.471397, 0.492898, 0.514103, 0.534998, 0.555570, 0.575808, 0.595699, 0.615232, 0.634393, 0.653173, 0.671559, 0.689541,
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0.707107, 0.724247, 0.740951, 0.757209, 0.773010, 0.788346, 0.803208, 0.817585, 0.831470, 0.844854, 0.857729, 0.870087, 0.881921, 0.893224, 0.903989, 0.914210,
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0.923880, 0.932993, 0.941544, 0.949528, 0.956940, 0.963776, 0.970031, 0.975702, 0.980785, 0.985278, 0.989177, 0.992480, 0.995185, 0.997290, 0.998795, 0.999699,
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1.000000, 0.999699, 0.998795, 0.997290, 0.995185, 0.992480, 0.989177, 0.985278, 0.980785, 0.975702, 0.970031, 0.963776, 0.956940, 0.949528, 0.941544, 0.932993,
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0.923880, 0.914210, 0.903989, 0.893224, 0.881921, 0.870087, 0.857729, 0.844854, 0.831470, 0.817585, 0.803208, 0.788346, 0.773010, 0.757209, 0.740951, 0.724247,
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0.707107, 0.689541, 0.671559, 0.653173, 0.634393, 0.615232, 0.595699, 0.575808, 0.555570, 0.534998, 0.514103, 0.492898, 0.471397, 0.449611, 0.427555, 0.405241,
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0.382683, 0.359895, 0.336890, 0.313682, 0.290285, 0.266713, 0.242980, 0.219101, 0.195090, 0.170962, 0.146730, 0.122411, 0.098017, 0.073565, 0.049068, 0.024541,
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0.000000, -0.024541, -0.049068, -0.073565, -0.098017, -0.122411, -0.146730, -0.170962, -0.195090, -0.219101, -0.242980, -0.266713, -0.290285, -0.313682, -0.336890, -0.359895,
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-0.382683, -0.405241, -0.427555, -0.449611, -0.471397, -0.492898, -0.514103, -0.534998, -0.555570, -0.575808, -0.595699, -0.615232, -0.634393, -0.653173, -0.671559, -0.689541,
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-0.707107, -0.724247, -0.740951, -0.757209, -0.773010, -0.788346, -0.803208, -0.817585, -0.831470, -0.844854, -0.857729, -0.870087, -0.881921, -0.893224, -0.903989, -0.914210,
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-0.923880, -0.932993, -0.941544, -0.949528, -0.956940, -0.963776, -0.970031, -0.975702, -0.980785, -0.985278, -0.989177, -0.992480, -0.995185, -0.997290, -0.998795, -0.999699,
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-1.000000, -0.999699, -0.998795, -0.997290, -0.995185, -0.992480, -0.989177, -0.985278, -0.980785, -0.975702, -0.970031, -0.963776, -0.956940, -0.949528, -0.941544, -0.932993,
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-0.923880, -0.914210, -0.903989, -0.893224, -0.881921, -0.870087, -0.857729, -0.844854, -0.831470, -0.817585, -0.803208, -0.788346, -0.773010, -0.757209, -0.740951, -0.724247,
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-0.707107, -0.689541, -0.671559, -0.653173, -0.634393, -0.615232, -0.595699, -0.575808, -0.555570, -0.534998, -0.514103, -0.492898, -0.471397, -0.449611, -0.427555, -0.405241,
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-0.382683, -0.359895, -0.336890, -0.313682, -0.290285, -0.266713, -0.242980, -0.219101, -0.195090, -0.170962, -0.146730, -0.122411, -0.098017, -0.073565, -0.049068, -0.024541,
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};
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struct Tone {
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uint32_t phase;
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uint16_t frequency;
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float amplitude;
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inline bool active() const {
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return amplitude > 0;
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}
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inline void update(uint32_t t) {
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phase += t * frequency;
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}
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inline float get() const {
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uint8_t id = phase >> 12;
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return SIN[id] * amplitude;
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}
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};
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