Merge pull request #1112 from newsboytko/newsboytko/midi-keycodes

Flesh out MIDI support

1 files changed, 164 insertions, 158 deletions

diff --git a/quantum/audio/audio.c b/quantum/audio/audio.c
index 2a315fd16..e1e81fd2b 100644
--- a/quantum/audio/audio.c
+++ b/quantum/audio/audio.c
@@ -89,15 +89,15 @@ void audio_init()
     }
     audio_config.raw = eeconfig_read_audio();
 
-        // Set port PC6 (OC3A and /OC4A) as output
+    // Set port PC6 (OC3A and /OC4A) as output
     DDRC |= _BV(PORTC6);
 
     DISABLE_AUDIO_COUNTER_3_ISR;
 
-        // TCCR3A / TCCR3B: Timer/Counter #3 Control Registers
-        // Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6
-        // Waveform Generation Mode (WGM3n) = 0b1110 = Fast PWM Mode 14 (Period = ICR3, Duty Cycle = OCR3A)
-        // Clock Select (CS3n) = 0b010 = Clock / 8
+    // TCCR3A / TCCR3B: Timer/Counter #3 Control Registers
+    // Compare Output Mode (COM3An) = 0b00 = Normal port operation, OC3A disconnected from PC6
+    // Waveform Generation Mode (WGM3n) = 0b1110 = Fast PWM Mode 14 (Period = ICR3, Duty Cycle = OCR3A)
+    // Clock Select (CS3n) = 0b010 = Clock / 8
     TCCR3A = (0 << COM3A1) | (0 << COM3A0) | (1 << WGM31) | (0 << WGM30);
     TCCR3B = (1 << WGM33)  | (1 << WGM32)  | (0 << CS32)  | (1 << CS31) | (0 << CS30);
 
@@ -106,6 +106,8 @@ void audio_init()
 
 void stop_all_notes()
 {
+    dprintf("audio stop all notes");
+
     if (!audio_initialized) {
         audio_init();
     }
@@ -128,6 +130,8 @@ void stop_all_notes()
 
 void stop_note(float freq)
 {
+    dprintf("audio stop note freq=%d", (int)freq);
+
     if (playing_note) {
         if (!audio_initialized) {
             audio_init();
@@ -183,159 +187,161 @@ float vibrato(float average_freq) {
 
 ISR(TIMER3_COMPA_vect)
 {
-        float freq;
-
-        if (playing_note) {
-                if (voices > 0) {
-                        if (polyphony_rate > 0) {
-                                if (voices > 1) {
-                                        voice_place %= voices;
-                                        if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
-                                                voice_place = (voice_place + 1) % voices;
-                                                place = 0.0;
-                                        }
-                                }
-
-                                #ifdef VIBRATO_ENABLE
-                                        if (vibrato_strength > 0) {
-                                                freq = vibrato(frequencies[voice_place]);
-                                        } else {
-                                                freq = frequencies[voice_place];
-                                        }
-                                #else
-                                        freq = frequencies[voice_place];
-                                #endif
-                        } else {
-                                if (glissando) {
-                                        if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
-                                                frequency = frequency * pow(2, 440/frequency/12/2);
-                                        } else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
-                                                frequency = frequency * pow(2, -440/frequency/12/2);
-                                        } else {
-                                                frequency = frequencies[voices - 1];
-                                        }
-                                } else {
-                                        frequency = frequencies[voices - 1];
-                                }                               
-
-                                #ifdef VIBRATO_ENABLE
-                                        if (vibrato_strength > 0) {
-                                                freq = vibrato(frequency);
-                                        } else {
-                                                freq = frequency;
-                                        }
-                                #else
-                                        freq = frequency;
-                                #endif
-                        }
-
-                        if (envelope_index < 65535) {
-                                envelope_index++;
-                        }
-
-                        freq = voice_envelope(freq);
-
-                        if (freq < 30.517578125) {
-                                freq = 30.52;
-                        }
-
-                        TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
-                        TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
-                }
-        }
-
-        if (playing_notes) {
-                if (note_frequency > 0) {
-                        #ifdef VIBRATO_ENABLE
-                                if (vibrato_strength > 0) {
-                                        freq = vibrato(note_frequency);
-                                } else {
-                                        freq = note_frequency;
-                                }
-                        #else
-                                        freq = note_frequency;
-                        #endif
-
-                        if (envelope_index < 65535) {
-                                envelope_index++;
-                        }
-                        freq = voice_envelope(freq);
-
-                        TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
-                        TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
-                } else {
-                        TIMER_3_PERIOD = 0;
-                        TIMER_3_DUTY_CYCLE = 0;
-                }
-
-                note_position++;
-                bool end_of_note = false;
-                if (TIMER_3_PERIOD > 0) {
-                        end_of_note = (note_position >= (note_length / TIMER_3_PERIOD * 0xFFFF));
-                } else {
-                        end_of_note = (note_position >= (note_length * 0x7FF));
-                }
-
-                if (end_of_note) {
-                        current_note++;
-                        if (current_note >= notes_count) {
-                                if (notes_repeat) {
-                                        current_note = 0;
-                                } else {
-                                        DISABLE_AUDIO_COUNTER_3_ISR;
-                                        DISABLE_AUDIO_COUNTER_3_OUTPUT;
-                                        playing_notes = false;
-                                        return;
-                                }
-                        }
-                        if (!note_resting && (notes_rest > 0)) {
-                                note_resting = true;
-                                note_frequency = 0;
-                                note_length = notes_rest;
-                                current_note--;
-                        } else {
-                                note_resting = false;
-                                envelope_index = 0;
-                                note_frequency = (*notes_pointer)[current_note][0];
-                                note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
-                        }
-
-                        note_position = 0;
-                }
-        }
-
-        if (!audio_config.enable) {
-                playing_notes = false;
-                playing_note = false;
-        }
+    float freq;
+
+    if (playing_note) {
+        if (voices > 0) {
+            if (polyphony_rate > 0) {
+                if (voices > 1) {
+                    voice_place %= voices;
+                    if (place++ > (frequencies[voice_place] / polyphony_rate / CPU_PRESCALER)) {
+                        voice_place = (voice_place + 1) % voices;
+                        place = 0.0;
+                    }
+                }
+
+                #ifdef VIBRATO_ENABLE
+                    if (vibrato_strength > 0) {
+                        freq = vibrato(frequencies[voice_place]);
+                    } else {
+                        freq = frequencies[voice_place];
+                    }
+                #else
+                    freq = frequencies[voice_place];
+                #endif
+            } else {
+                if (glissando) {
+                    if (frequency != 0 && frequency < frequencies[voices - 1] && frequency < frequencies[voices - 1] * pow(2, -440/frequencies[voices - 1]/12/2)) {
+                        frequency = frequency * pow(2, 440/frequency/12/2);
+                    } else if (frequency != 0 && frequency > frequencies[voices - 1] && frequency > frequencies[voices - 1] * pow(2, 440/frequencies[voices - 1]/12/2)) {
+                        frequency = frequency * pow(2, -440/frequency/12/2);
+                    } else {
+                        frequency = frequencies[voices - 1];
+                    }
+                } else {
+                    frequency = frequencies[voices - 1];
+                }
+
+                #ifdef VIBRATO_ENABLE
+                    if (vibrato_strength > 0) {
+                        freq = vibrato(frequency);
+                    } else {
+                        freq = frequency;
+                    }
+                #else
+                    freq = frequency;
+                #endif
+            }
+
+            if (envelope_index < 65535) {
+                envelope_index++;
+            }
+
+            freq = voice_envelope(freq);
+
+            if (freq < 30.517578125) {
+                freq = 30.52;
+            }
+
+            TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
+            TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
+        }
+    }
+
+    if (playing_notes) {
+        if (note_frequency > 0) {
+            #ifdef VIBRATO_ENABLE
+                if (vibrato_strength > 0) {
+                    freq = vibrato(note_frequency);
+                } else {
+                    freq = note_frequency;
+                }
+            #else
+                    freq = note_frequency;
+            #endif
+
+            if (envelope_index < 65535) {
+                envelope_index++;
+            }
+            freq = voice_envelope(freq);
+
+            TIMER_3_PERIOD = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
+            TIMER_3_DUTY_CYCLE = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre);
+        } else {
+            TIMER_3_PERIOD = 0;
+            TIMER_3_DUTY_CYCLE = 0;
+        }
+
+        note_position++;
+        bool end_of_note = false;
+        if (TIMER_3_PERIOD > 0) {
+            end_of_note = (note_position >= (note_length / TIMER_3_PERIOD * 0xFFFF));
+        } else {
+            end_of_note = (note_position >= (note_length * 0x7FF));
+        }
+
+        if (end_of_note) {
+            current_note++;
+            if (current_note >= notes_count) {
+                if (notes_repeat) {
+                    current_note = 0;
+                } else {
+                    DISABLE_AUDIO_COUNTER_3_ISR;
+                    DISABLE_AUDIO_COUNTER_3_OUTPUT;
+                    playing_notes = false;
+                    return;
+                }
+            }
+            if (!note_resting && (notes_rest > 0)) {
+                note_resting = true;
+                note_frequency = 0;
+                note_length = notes_rest;
+                current_note--;
+            } else {
+                note_resting = false;
+                envelope_index = 0;
+                note_frequency = (*notes_pointer)[current_note][0];
+                note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
+            }
+
+            note_position = 0;
+        }
+    }
+
+    if (!audio_config.enable) {
+        playing_notes = false;
+        playing_note = false;
+    }
 }
 
 void play_note(float freq, int vol) {
 
+    dprintf("audio play note freq=%d vol=%d", (int)freq, vol);
+
     if (!audio_initialized) {
         audio_init();
     }
 
-        if (audio_config.enable && voices < 8) {
-            DISABLE_AUDIO_COUNTER_3_ISR;
+    if (audio_config.enable && voices < 8) {
+        DISABLE_AUDIO_COUNTER_3_ISR;
 
-            // Cancel notes if notes are playing
-            if (playing_notes)
-                stop_all_notes();
+        // Cancel notes if notes are playing
+        if (playing_notes)
+            stop_all_notes();
 
-            playing_note = true;
+        playing_note = true;
 
-            envelope_index = 0;
+        envelope_index = 0;
 
-            if (freq > 0) {
-                frequencies[voices] = freq;
-                volumes[voices] = vol;
-                voices++;
-            }
+        if (freq > 0) {
+            frequencies[voices] = freq;
+            volumes[voices] = vol;
+            voices++;
+        }
 
         ENABLE_AUDIO_COUNTER_3_ISR;
         ENABLE_AUDIO_COUNTER_3_OUTPUT;
-        }
+    }
 
 }
 
@@ -346,37 +352,37 @@ void play_notes(float (*np)[][2], uint16_t n_count, bool n_repeat, float n_rest)
         audio_init();
     }
 
-        if (audio_config.enable) {
+    if (audio_config.enable) {
 
-            DISABLE_AUDIO_COUNTER_3_ISR;
+        DISABLE_AUDIO_COUNTER_3_ISR;
 
-                // Cancel note if a note is playing
-            if (playing_note)
-                stop_all_notes();
+        // Cancel note if a note is playing
+        if (playing_note)
+            stop_all_notes();
 
-            playing_notes = true;
+        playing_notes = true;
 
-            notes_pointer = np;
-            notes_count = n_count;
-            notes_repeat = n_repeat;
-            notes_rest = n_rest;
+        notes_pointer = np;
+        notes_count = n_count;
+        notes_repeat = n_repeat;
+        notes_rest = n_rest;
 
-            place = 0;
-            current_note = 0;
+        place = 0;
+        current_note = 0;
 
         note_frequency = (*notes_pointer)[current_note][0];
         note_length = ((*notes_pointer)[current_note][1] / 4) * (((float)note_tempo) / 100);
-            note_position = 0;
+        note_position = 0;
 
 
         ENABLE_AUDIO_COUNTER_3_ISR;
         ENABLE_AUDIO_COUNTER_3_OUTPUT;
-        }
+    }
 
 }
 
 bool is_playing_notes(void) {
-        return playing_notes;
+    return playing_notes;
 }
 
 bool is_audio_on(void) {