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