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| author | Jack Humbert <jack.humb@gmail.com> | 2016-04-20 23:16:39 -0400 |
|---|---|---|
| committer | Jack Humbert <jack.humb@gmail.com> | 2016-04-20 23:16:39 -0400 |
| commit | 2e60054951ce08e973c735991bd95390c6aa3842 (patch) | |
| tree | d70248bce2189967115da3d3b72554622f1df07b /quantum | |
| parent | 2e303b40aed372ea69b79850dae41e4f8ea457f4 (diff) | |
| download | qmk_firmware-2e60054951ce08e973c735991bd95390c6aa3842.tar.gz qmk_firmware-2e60054951ce08e973c735991bd95390c6aa3842.zip | |
fade envelope
Diffstat (limited to 'quantum')
| -rw-r--r-- | quantum/audio.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/quantum/audio.c b/quantum/audio.c index 1327887d9a..df421ef999 100644 --- a/quantum/audio.c +++ b/quantum/audio.c @@ -302,18 +302,19 @@ float vibrato(float average_freq) { float envelope(float f) { uint16_t compensated_index = (uint16_t)((float)envelope_index * (880.0 / f)); switch (compensated_index) { - case 0: - note_timbre = TIMBRE_50; - break; - case 20: - note_timbre = TIMBRE_25; - break; - case 32: + case 0 ... 9: + f = f / 4; note_timbre = TIMBRE_12; break; - case 40 ... 60: + case 10 ... 19: f = f / 2; - note_timbre = TIMBRE_50; + note_timbre = TIMBRE_12; + break; + case 20 ... 200: + note_timbre = .125 - pow(((float)compensated_index - 20) / (200 - 20), 2)*.125; + break; + default: + note_timbre = 0; break; } return f; @@ -414,6 +415,8 @@ ISR(TIMER3_COMPA_vect) { } freq = envelope(freq); + if (freq < 30.517578125) + freq = 30.52; ICR3 = (int)(((double)F_CPU) / (freq * CPU_PRESCALER)); // Set max to the period OCR3A = (int)((((double)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre); // Set compare to half the period } |