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authorJack Humbert <jack.humb@gmail.com>2016-04-22 00:14:25 +0200
committerJack Humbert <jack.humb@gmail.com>2016-04-22 00:14:25 +0200
commit9828aba2a12f03fccbc1095bc8e4918ae58fa31b (patch)
tree9990820fa4f42650599b40527c94fe3e6c3f6a2d /quantum
parenta8fd65d86f1bb43a845555ee2ac4b588798684ad (diff)
downloadqmk_firmware-9828aba2a12f03fccbc1095bc8e4918ae58fa31b.tar.gz
qmk_firmware-9828aba2a12f03fccbc1095bc8e4918ae58fa31b.tar.xz
adds multiple voices and the ability to iterate/deiterate between them
Diffstat (limited to 'quantum')
-rw-r--r--quantum/audio/voices.c31
-rw-r--r--quantum/audio/voices.h6
2 files changed, 34 insertions, 3 deletions
diff --git a/quantum/audio/voices.c b/quantum/audio/voices.c
index 51652927b..92ada47f7 100644
--- a/quantum/audio/voices.c
+++ b/quantum/audio/voices.c
@@ -1,23 +1,35 @@
#include "voices.h"
+// these are imported from audio.c
extern uint16_t envelope_index;
extern float note_timbre;
+extern float polyphony_rate;
-voice_type voice = default_voice;
+voice_type voice = duty_osc;
void set_voice(voice_type v) {
voice = v;
}
+void voice_iterate() {
+ voice = (voice + 1) % number_of_voices;
+}
+
+void voice_deiterate() {
+ voice = (voice - 1) % number_of_voices;
+}
+
float voice_envelope(float frequency) {
// envelope_index ranges from 0 to 0xFFFF, which is preserved at 880.0 Hz
uint16_t compensated_index = (uint16_t)((float)envelope_index * (880.0 / frequency));
switch (voice) {
case default_voice:
- // nothing here on purpose
+ note_timbre = TIMBRE_50;
+ polyphony_rate = 0;
break;
case butts_fader:
+ polyphony_rate = 0;
switch (compensated_index) {
case 0 ... 9:
frequency = frequency / 4;
@@ -36,6 +48,7 @@ float voice_envelope(float frequency) {
}
break;
case octave_crunch:
+ polyphony_rate = 0;
switch (compensated_index) {
case 0 ... 9:
case 20 ... 24:
@@ -54,6 +67,20 @@ float voice_envelope(float frequency) {
break;
}
break;
+ case duty_osc:
+ // This slows the loop down a substantial amount, so higher notes may freeze
+ polyphony_rate = 0;
+ switch (compensated_index) {
+ default:
+ #define SPEED 10
+ #define AMP .75
+ // sine wave is slow
+ // note_timbre = (sin((float)compensated_index/10000*SPEED) * AMP / 2) + .5;
+ // triangle wave is a bit faster
+ note_timbre = (float)abs((compensated_index*SPEED % 3000) - 1500) * ( AMP / 1500 ) + (1 - AMP) / 2;
+ break;
+ }
+ break;
}
return frequency;
diff --git a/quantum/audio/voices.h b/quantum/audio/voices.h
index 317f5d98c..44c5066b5 100644
--- a/quantum/audio/voices.h
+++ b/quantum/audio/voices.h
@@ -13,9 +13,13 @@ float voice_envelope(float frequency);
typedef enum {
default_voice,
butts_fader,
- octave_crunch
+ octave_crunch,
+ duty_osc,
+ number_of_voices // important that this is last
} voice_type;
void set_voice(voice_type v);
+void voice_iterate();
+void voice_deiterate();
#endif \ No newline at end of file