fade envelope
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2e303b40ae
commit
2e60054951
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@ -302,18 +302,19 @@ float vibrato(float average_freq) {
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float envelope(float f) {
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uint16_t compensated_index = (uint16_t)((float)envelope_index * (880.0 / f));
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switch (compensated_index) {
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case 0:
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note_timbre = TIMBRE_50;
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break;
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case 20:
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note_timbre = TIMBRE_25;
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break;
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case 32:
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case 0 ... 9:
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f = f / 4;
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note_timbre = TIMBRE_12;
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break;
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case 40 ... 60:
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case 10 ... 19:
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f = f / 2;
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note_timbre = TIMBRE_50;
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note_timbre = TIMBRE_12;
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break;
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case 20 ... 200:
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note_timbre = .125 - pow(((float)compensated_index - 20) / (200 - 20), 2)*.125;
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break;
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default:
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note_timbre = 0;
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break;
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}
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return f;
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@ -414,6 +415,8 @@ ISR(TIMER3_COMPA_vect) {
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}
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freq = envelope(freq);
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if (freq < 30.517578125)
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freq = 30.52;
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ICR3 = (int)(((double)F_CPU) / (freq * CPU_PRESCALER)); // Set max to the period
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OCR3A = (int)((((double)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre); // Set compare to half the period
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}
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