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process_midi.c
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process_midi.c
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#include "process_midi.h"
#include "timer.h"
typedef union {
uint32_t raw;
struct {
uint8_t octave :4;
int8_t transpose :4;
uint8_t velocity :4;
uint8_t channel :4;
uint8_t modulation_interval :4;
};
} midi_config_t;
midi_config_t midi_config;
#define MIDI_INVALID_NOTE 0xFF
#define MIDI_TONE_COUNT (MIDI_TONE_MAX - MIDI_TONE_MIN + 1)
static uint8_t tone_status[MIDI_TONE_COUNT];
static uint8_t midi_modulation;
static int8_t midi_modulation_step;
static uint16_t midi_modulation_timer;
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_2 - MIDI_OCTAVE_MIN;
midi_config.transpose = 0;
midi_config.velocity = (MIDI_VELOCITY_MAX - MIDI_VELOCITY_MIN);
midi_config.channel = 0;
midi_config.modulation_interval = 8;
for (uint8_t i = 0; i < MIDI_TONE_COUNT; i++)
{
tone_status[i] = MIDI_INVALID_NOTE;
}
midi_modulation = 0;
midi_modulation_step = 0;
midi_modulation_timer = 0;
}
void midi_task(void)
{
if (timer_elapsed(midi_modulation_timer) < midi_config.modulation_interval)
return;
midi_modulation_timer = timer_read();
if (midi_modulation_step != 0)
{
dprintf("midi modulation %d\n", midi_modulation);
midi_send_cc(&midi_device, midi_config.channel, 0x1, midi_modulation);
if (midi_modulation_step < 0 && midi_modulation < -midi_modulation_step) {
midi_modulation = 0;
midi_modulation_step = 0;
return;
}
midi_modulation += midi_modulation_step;
if (midi_modulation > 127)
midi_modulation = 127;
}
}
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) {
uint8_t note = 12 * midi_config.octave + tone + midi_config.transpose;
midi_send_noteon(&midi_device, channel, note, velocity);
dprintf("midi noteon channel:%d note:%d velocity:%d\n", channel, note, velocity);
tone_status[tone] = note;
}
else {
uint8_t note = tone_status[tone];
if (note != MIDI_INVALID_NOTE)
{
midi_send_noteoff(&midi_device, channel, note, velocity);
dprintf("midi noteoff channel:%d note:%d velocity:%d\n", channel, note, velocity);
}
tone_status[tone] = MIDI_INVALID_NOTE;
}
return false;
}
case MIDI_OCTAVE_MIN ... MIDI_OCTAVE_MAX:
if (record->event.pressed) {
midi_config.octave = keycode - MIDI_OCTAVE_MIN;
dprintf("midi octave %d\n", midi_config.octave);
}
return false;
case MI_OCTD:
if (record->event.pressed && midi_config.octave > 0) {
midi_config.octave--;
dprintf("midi octave %d\n", midi_config.octave);
}
return false;
case MI_OCTU:
if (record->event.pressed && midi_config.octave < (MIDI_OCTAVE_MAX - MIDI_OCTAVE_MIN)) {
midi_config.octave++;
dprintf("midi octave %d\n", midi_config.octave);
}
return false;
case MIDI_TRANSPOSE_MIN ... MIDI_TRANSPOSE_MAX:
if (record->event.pressed) {
midi_config.transpose = keycode - MI_TRNS_0;
dprintf("midi transpose %d\n", midi_config.transpose);
}
return false;
case MI_TRNSD:
if (record->event.pressed && midi_config.transpose > (MIDI_TRANSPOSE_MIN - MI_TRNS_0)) {
midi_config.transpose--;
dprintf("midi transpose %d\n", midi_config.transpose);
}
return false;
case MI_TRNSU:
if (record->event.pressed && midi_config.transpose < (MIDI_TRANSPOSE_MAX - MI_TRNS_0)) {
const bool positive = midi_config.transpose > 0;
midi_config.transpose++;
if (positive && midi_config.transpose < 0)
midi_config.transpose--;
dprintf("midi transpose %d\n", midi_config.transpose);
}
return false;
case MIDI_VELOCITY_MIN ... MIDI_VELOCITY_MAX:
if (record->event.pressed) {
midi_config.velocity = keycode - MIDI_VELOCITY_MIN;
dprintf("midi velocity %d\n", midi_config.velocity);
}
return false;
case MI_VELD:
if (record->event.pressed && midi_config.velocity > 0) {
midi_config.velocity--;
dprintf("midi velocity %d\n", midi_config.velocity);
}
return false;
case MI_VELU:
if (record->event.pressed) {
midi_config.velocity++;
dprintf("midi velocity %d\n", midi_config.velocity);
}
return false;
case MIDI_CHANNEL_MIN ... MIDI_CHANNEL_MAX:
if (record->event.pressed) {
midi_config.channel = keycode - MIDI_CHANNEL_MIN;
dprintf("midi channel %d\n", midi_config.channel);
}
return false;
case MI_CHD:
if (record->event.pressed) {
midi_config.channel--;
dprintf("midi channel %d\n", midi_config.channel);
}
return false;
case MI_CHU:
if (record->event.pressed) {
midi_config.channel++;
dprintf("midi channel %d\n", midi_config.channel);
}
return false;
case MI_OFF:
if (record->event.pressed) {
midi_send_cc(&midi_device, midi_config.channel, 0x7B, 0);
dprintf("midi off\n");
}
return false;
case MI_SUS:
midi_send_cc(&midi_device, midi_config.channel, 0x40, record->event.pressed ? 127 : 0);
dprintf("midi sustain %d\n", record->event.pressed);
return false;
case MI_PORT:
midi_send_cc(&midi_device, midi_config.channel, 0x41, record->event.pressed ? 127 : 0);
dprintf("midi portamento %d\n", record->event.pressed);
return false;
case MI_SOST:
midi_send_cc(&midi_device, midi_config.channel, 0x42, record->event.pressed ? 127 : 0);
dprintf("midi sostenuto %d\n", record->event.pressed);
return false;
case MI_SOFT:
midi_send_cc(&midi_device, midi_config.channel, 0x43, record->event.pressed ? 127 : 0);
dprintf("midi soft %d\n", record->event.pressed);
return false;
case MI_LEG:
midi_send_cc(&midi_device, midi_config.channel, 0x43, record->event.pressed ? 127 : 0);
dprintf("midi legato %d\n", record->event.pressed);
return false;
case MI_MOD:
midi_modulation_step = record->event.pressed ? 1 : -1;
return false;
case MI_MODSD:
if (record->event.pressed) {
midi_config.modulation_interval++;
// prevent overflow
if (midi_config.modulation_interval == 0)
midi_config.modulation_interval--;
dprintf("midi modulation interval %d\n", midi_config.modulation_interval);
}
return false;
case MI_MODSU:
if (record->event.pressed && midi_config.modulation_interval > 0) {
midi_config.modulation_interval--;
dprintf("midi modulation interval %d\n", midi_config.modulation_interval);
}
return false;
};
return true;
}