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qmk_firmware/quantum/process_keycode/process_midi.c

127 lines
3.9 KiB

#include "process_midi.h"
#if 0
bool midi_activated = false;
uint8_t midi_starting_note = 0x0C;
int midi_offset = 7;
#endif
typedef union {
uint16_t raw;
struct {
uint8_t octave :4;
uint8_t velocity :4;
uint8_t channel :4;
};
} midi_config_t;
midi_config_t midi_config;
#define MIDI_INVALID_NOTE 0xFF
#define MIDI_MAX_NOTES_ON 10
typedef struct {
uint8_t note;
uint8_t tone;
} midi_notes_on_array_entry_t;
typedef struct {
uint8_t length;
midi_notes_on_array_entry_t values[MIDI_MAX_NOTES_ON];
} midi_notes_on_array_t;
static midi_notes_on_array_t notes_on;
inline uint8_t compute_velocity(uint8_t setting)
{
return (setting + 1) * (128 / (MIDI_VELOCITY_MAX - MIDI_VELOCITY_MIN + 1));
}
void midi_init(void)
{
midi_config.octave = MI_OCT_0 - MIDI_OCTAVE_MIN;
midi_config.velocity = (MIDI_VELOCITY_MAX - MIDI_VELOCITY_MIN);
midi_config.channel = 0;
notes_on.length = 0;
}
bool process_midi(uint16_t keycode, keyrecord_t *record)
{
switch (keycode) {
case MIDI_TONE_MIN ... MIDI_TONE_MAX:
{
uint8_t channel = midi_config.channel;
uint8_t tone = keycode - MIDI_TONE_MIN;
uint8_t velocity = compute_velocity(midi_config.velocity);
if (record->event.pressed && notes_on.length < MIDI_MAX_NOTES_ON) {
uint8_t note = 12 * midi_config.octave + tone;
midi_send_noteon(&midi_device, channel, note, velocity);
dprintf("midi noteon channel:%d note:%d velocity:%d\n", channel, note, velocity);
notes_on.values[notes_on.length].note = note;
notes_on.values[notes_on.length].tone = tone;
notes_on.length++;
}
else {
for (uint8_t i = 0; i < notes_on.length; i++) {
uint8_t note = notes_on.values[i].note;
if (tone == notes_on.values[i].tone) {
midi_send_noteoff(&midi_device, channel, note, velocity);
dprintf("midi noteoff channel:%d note:%d velocity:%d\n", channel, note, velocity);
for (uint8_t j=i; j < notes_on.length - 1; j++)
{
notes_on.values[j] = notes_on.values[j + 1];
}
notes_on.length--;
break;
}
}
}
return false;
}
case MIDI_OCTAVE_MIN ... MIDI_OCTAVE_MAX:
if (record->event.pressed)
midi_config.octave = keycode - MIDI_OCTAVE_MIN;
return false;
case MI_OCTD:
if (record->event.pressed && midi_config.octave > 0)
midi_config.octave--;
return false;
case MI_OCTU:
if (record->event.pressed && midi_config.octave < (MIDI_OCTAVE_MAX - MIDI_OCTAVE_MIN))
midi_config.octave++;
return false;
case MIDI_VELOCITY_MIN ... MIDI_VELOCITY_MAX:
if (record->event.pressed)
midi_config.velocity = keycode - MIDI_VELOCITY_MIN;
return false;
case MI_VELD:
if (record->event.pressed && midi_config.velocity > 0)
midi_config.velocity--;
return false;
case MI_VELU:
if (record->event.pressed)
midi_config.velocity++;
return false;
case MIDI_CHANNEL_MIN ... MIDI_CHANNEL_MAX:
if (record->event.pressed)
midi_config.channel = keycode - MIDI_CHANNEL_MIN;
return false;
case MI_CHD:
if (record->event.pressed)
midi_config.channel--;
return false;
case MI_CHU:
if (record->event.pressed)
midi_config.channel++;
return false;
case MI_SUS:
//TODO
return false;
};
return true;
}