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#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
#if 0
typedef struct {
uint64_t low;
uint64_t high;
} uint128_t;
#if 0
static void right_shift_uint128_t(uint128_t* val, uint8_t shift)
{
uint64_t high_mask = ~0 >> (64 - shift);
uint64_t high_bits = (val->high & high_mask) << (64 - shift);
val->high = val->high >> shift;
val->low = (val->low >> shift) | high_bits;
}
#endif
static uint64_t left_shift_uint64_t(uint64_t val, uint8_t shift)
{
dprintf("left_shift_uint64_t(val, %c) ...\n", val, shift);
while (shift > 16u) {
dprintf(" left_shift_uint64_t: val=?, shift=%c\n", val, shift);
val <<= 16;
shift -= 16;
}
dprintf(" left_shift_uint64_t: val=?, shift=%c\n", val, shift);
val <<= shift;
return val;
}
static void set_bit_uint128_t(uint128_t* val, uint8_t shift)
{
uint64_t x = 1u;
if (shift < 64)
{
x = left_shift_uint64_t(x, shift);
dprintf("x: %d\n", x);
dprintf("set_bit_uint128_t (%d): 0x%016X%016X\n", shift, 0, x);
val->low = val->low | left_shift_uint64_t(1u, shift);
}
else
{
x = left_shift_uint64_t(x, shift - 64);
dprintf("set_bit_uint128_t (%d): 0x%016X%016X\n", shift, x, 0);
val->high = val->high | left_shift_uint64_t(1u, shift - 64);
}
}
static void clear_bit_uint128_t(uint128_t* val, uint8_t shift)
{
if (shift < 64)
{
val->low = val->low & ~left_shift_uint64_t(1u, shift);
}
else
{
val->high = val->high & ~left_shift_uint64_t(1u, shift - 64);
}
}
static bool is_bit_set_uint128_t(const uint128_t* val, uint8_t shift)
{
if (shift < 64)
{
return !!(val->low & (1u << shift));
}
else
{
return !!(val->high & (1u << (shift - 64)));
}
}
uint128_t note_status = { 0, 0 };
#endif
#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;
};
#if 0
if (keycode == MI_ON && record->event.pressed) {
midi_activated = true;
#ifdef AUDIO_ENABLE
music_scale_user();
#endif
return false;
}
if (keycode == MI_OFF && record->event.pressed) {
midi_activated = false;
midi_send_cc(&midi_device, 0, 0x7B, 0);
return false;
}
if (midi_activated) {
if (record->event.key.col == (MATRIX_COLS - 1) && record->event.key.row == (MATRIX_ROWS - 1)) {
if (record->event.pressed) {
midi_starting_note++; // Change key
midi_send_cc(&midi_device, 0, 0x7B, 0);
}
return false;
}
if (record->event.key.col == (MATRIX_COLS - 2) && record->event.key.row == (MATRIX_ROWS - 1)) {
if (record->event.pressed) {
midi_starting_note--; // Change key
midi_send_cc(&midi_device, 0, 0x7B, 0);
}
return false;
}
if (record->event.key.col == (MATRIX_COLS - 3) && record->event.key.row == (MATRIX_ROWS - 1) && record->event.pressed) {
midi_offset++; // Change scale
midi_send_cc(&midi_device, 0, 0x7B, 0);
return false;
}
if (record->event.key.col == (MATRIX_COLS - 4) && record->event.key.row == (MATRIX_ROWS - 1) && record->event.pressed) {
midi_offset--; // Change scale
midi_send_cc(&midi_device, 0, 0x7B, 0);
return false;
}
// basic
// uint8_t note = (midi_starting_note + SCALE[record->event.key.col + midi_offset])+12*(MATRIX_ROWS - record->event.key.row);
// advanced
// uint8_t note = (midi_starting_note + record->event.key.col + midi_offset)+12*(MATRIX_ROWS - record->event.key.row);
// guitar
uint8_t note = (midi_starting_note + record->event.key.col + midi_offset)+5*(MATRIX_ROWS - record->event.key.row);
// violin
// uint8_t note = (midi_starting_note + record->event.key.col + midi_offset)+7*(MATRIX_ROWS - record->event.key.row);
if (record->event.pressed) {
// midi_send_noteon(&midi_device, record->event.key.row, midi_starting_note + SCALE[record->event.key.col], 127);
midi_send_noteon(&midi_device, 0, note, 127);
} else {
// midi_send_noteoff(&midi_device, record->event.key.row, midi_starting_note + SCALE[record->event.key.col], 127);
midi_send_noteoff(&midi_device, 0, note, 127);
}
if (keycode < 0xFF) // ignores all normal keycodes, but lets RAISE, LOWER, etc through
return false;
}
#endif
return true;
}
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