254 lines
8.8 KiB
C
254 lines
8.8 KiB
C
/* Copyright 2016 Jack Humbert
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "process_midi.h"
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#ifdef MIDI_ENABLE
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#include "midi.h"
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#ifdef MIDI_BASIC
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void process_midi_basic_noteon(uint8_t note)
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{
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midi_send_noteon(&midi_device, 0, note, 128);
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}
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void process_midi_basic_noteoff(uint8_t note)
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{
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midi_send_noteoff(&midi_device, 0, note, 0);
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}
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void process_midi_all_notes_off(void)
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{
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midi_send_cc(&midi_device, 0, 0x7B, 0);
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}
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#endif // MIDI_BASIC
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#ifdef MIDI_ADVANCED
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#include "timer.h"
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static uint8_t tone_status[MIDI_TONE_COUNT];
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static uint8_t midi_modulation;
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static int8_t midi_modulation_step;
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static uint16_t midi_modulation_timer;
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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_2 - MIDI_OCTAVE_MIN;
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midi_config.transpose = 0;
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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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midi_config.modulation_interval = 8;
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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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midi_modulation = 0;
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midi_modulation_step = 0;
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midi_modulation_timer = 0;
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}
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void midi_task(void)
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{
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if (timer_elapsed(midi_modulation_timer) < midi_config.modulation_interval)
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return;
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midi_modulation_timer = timer_read();
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if (midi_modulation_step != 0)
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{
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dprintf("midi modulation %d\n", midi_modulation);
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midi_send_cc(&midi_device, midi_config.channel, 0x1, midi_modulation);
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if (midi_modulation_step < 0 && midi_modulation < -midi_modulation_step) {
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midi_modulation = 0;
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midi_modulation_step = 0;
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return;
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}
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midi_modulation += midi_modulation_step;
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if (midi_modulation > 127)
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midi_modulation = 127;
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}
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}
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uint8_t midi_compute_note(uint16_t keycode)
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{
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return 12 * midi_config.octave + (keycode - MIDI_TONE_MIN) + midi_config.transpose;
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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 = midi_compute_note(keycode);
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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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dprintf("midi octave %d\n", midi_config.octave);
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}
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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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dprintf("midi octave %d\n", midi_config.octave);
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}
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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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dprintf("midi octave %d\n", midi_config.octave);
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}
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return false;
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case MIDI_TRANSPOSE_MIN ... MIDI_TRANSPOSE_MAX:
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if (record->event.pressed) {
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midi_config.transpose = keycode - MI_TRNS_0;
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dprintf("midi transpose %d\n", midi_config.transpose);
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}
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return false;
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case MI_TRNSD:
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if (record->event.pressed && midi_config.transpose > (MIDI_TRANSPOSE_MIN - MI_TRNS_0)) {
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midi_config.transpose--;
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dprintf("midi transpose %d\n", midi_config.transpose);
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}
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return false;
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case MI_TRNSU:
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if (record->event.pressed && midi_config.transpose < (MIDI_TRANSPOSE_MAX - MI_TRNS_0)) {
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const bool positive = midi_config.transpose > 0;
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midi_config.transpose++;
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if (positive && midi_config.transpose < 0)
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midi_config.transpose--;
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dprintf("midi transpose %d\n", midi_config.transpose);
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}
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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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dprintf("midi velocity %d\n", midi_config.velocity);
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}
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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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dprintf("midi velocity %d\n", midi_config.velocity);
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}
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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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dprintf("midi velocity %d\n", midi_config.velocity);
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}
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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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dprintf("midi channel %d\n", midi_config.channel);
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}
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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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dprintf("midi channel %d\n", midi_config.channel);
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}
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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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dprintf("midi channel %d\n", midi_config.channel);
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}
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return false;
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case MI_ALLOFF:
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if (record->event.pressed) {
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midi_send_cc(&midi_device, midi_config.channel, 0x7B, 0);
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dprintf("midi all notes off\n");
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}
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return false;
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case MI_SUS:
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midi_send_cc(&midi_device, midi_config.channel, 0x40, record->event.pressed ? 127 : 0);
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dprintf("midi sustain %d\n", record->event.pressed);
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return false;
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case MI_PORT:
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midi_send_cc(&midi_device, midi_config.channel, 0x41, record->event.pressed ? 127 : 0);
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dprintf("midi portamento %d\n", record->event.pressed);
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return false;
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case MI_SOST:
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midi_send_cc(&midi_device, midi_config.channel, 0x42, record->event.pressed ? 127 : 0);
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dprintf("midi sostenuto %d\n", record->event.pressed);
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return false;
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case MI_SOFT:
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midi_send_cc(&midi_device, midi_config.channel, 0x43, record->event.pressed ? 127 : 0);
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dprintf("midi soft %d\n", record->event.pressed);
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return false;
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case MI_LEG:
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midi_send_cc(&midi_device, midi_config.channel, 0x43, record->event.pressed ? 127 : 0);
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dprintf("midi legato %d\n", record->event.pressed);
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return false;
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case MI_MOD:
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midi_modulation_step = record->event.pressed ? 1 : -1;
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return false;
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case MI_MODSD:
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if (record->event.pressed) {
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midi_config.modulation_interval++;
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// prevent overflow
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if (midi_config.modulation_interval == 0)
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midi_config.modulation_interval--;
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dprintf("midi modulation interval %d\n", midi_config.modulation_interval);
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}
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return false;
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case MI_MODSU:
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if (record->event.pressed && midi_config.modulation_interval > 0) {
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midi_config.modulation_interval--;
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dprintf("midi modulation interval %d\n", midi_config.modulation_interval);
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}
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return false;
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};
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return true;
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}
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#endif // MIDI_ADVANCED
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#endif // MIDI_ENABLE
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