264 lines
8.1 KiB
C
264 lines
8.1 KiB
C
#include "process_midi.h"
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#if 0
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bool midi_activated = false;
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uint8_t midi_starting_note = 0x0C;
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int midi_offset = 7;
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#endif
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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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#if 0
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typedef struct {
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uint64_t low;
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uint64_t high;
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} uint128_t;
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#if 0
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static void right_shift_uint128_t(uint128_t* val, uint8_t shift)
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{
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uint64_t high_mask = ~0 >> (64 - shift);
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uint64_t high_bits = (val->high & high_mask) << (64 - shift);
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val->high = val->high >> shift;
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val->low = (val->low >> shift) | high_bits;
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}
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#endif
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static uint64_t left_shift_uint64_t(uint64_t val, uint8_t shift)
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{
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dprintf("left_shift_uint64_t(val, %c) ...\n", val, shift);
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while (shift > 16u) {
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dprintf(" left_shift_uint64_t: val=?, shift=%c\n", val, shift);
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val <<= 16;
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shift -= 16;
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}
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dprintf(" left_shift_uint64_t: val=?, shift=%c\n", val, shift);
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val <<= shift;
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return val;
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}
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static void set_bit_uint128_t(uint128_t* val, uint8_t shift)
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{
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uint64_t x = 1u;
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if (shift < 64)
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{
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x = left_shift_uint64_t(x, shift);
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dprintf("x: %d\n", x);
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dprintf("set_bit_uint128_t (%d): 0x%016X%016X\n", shift, 0, x);
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val->low = val->low | left_shift_uint64_t(1u, shift);
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}
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else
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{
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x = left_shift_uint64_t(x, shift - 64);
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dprintf("set_bit_uint128_t (%d): 0x%016X%016X\n", shift, x, 0);
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val->high = val->high | left_shift_uint64_t(1u, shift - 64);
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}
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}
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static void clear_bit_uint128_t(uint128_t* val, uint8_t shift)
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{
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if (shift < 64)
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{
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val->low = val->low & ~left_shift_uint64_t(1u, shift);
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}
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else
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{
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val->high = val->high & ~left_shift_uint64_t(1u, shift - 64);
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}
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}
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static bool is_bit_set_uint128_t(const uint128_t* val, uint8_t shift)
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{
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if (shift < 64)
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{
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return !!(val->low & (1u << shift));
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}
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else
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{
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return !!(val->high & (1u << (shift - 64)));
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}
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}
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uint128_t note_status = { 0, 0 };
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#endif
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#define MIDI_MAX_NOTES_ON 10
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typedef struct {
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uint8_t note;
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uint8_t tone;
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} midi_notes_on_array_entry_t;
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typedef struct {
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uint8_t length;
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midi_notes_on_array_entry_t values[MIDI_MAX_NOTES_ON];
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} midi_notes_on_array_t;
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static midi_notes_on_array_t notes_on;
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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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notes_on.length = 0;
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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 && notes_on.length < MIDI_MAX_NOTES_ON) {
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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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notes_on.values[notes_on.length].note = note;
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notes_on.values[notes_on.length].tone = tone;
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notes_on.length++;
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}
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else {
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for (uint8_t i = 0; i < notes_on.length; i++) {
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uint8_t note = notes_on.values[i].note;
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if (tone == notes_on.values[i].tone) {
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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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for (uint8_t j=i; j < notes_on.length - 1; j++)
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{
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notes_on.values[j] = notes_on.values[j + 1];
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}
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notes_on.length--;
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break;
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}
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}
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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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#if 0
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if (keycode == MI_ON && record->event.pressed) {
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midi_activated = true;
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#ifdef AUDIO_ENABLE
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music_scale_user();
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#endif
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return false;
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}
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if (keycode == MI_OFF && record->event.pressed) {
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midi_activated = false;
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midi_send_cc(&midi_device, 0, 0x7B, 0);
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return false;
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}
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if (midi_activated) {
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if (record->event.key.col == (MATRIX_COLS - 1) && record->event.key.row == (MATRIX_ROWS - 1)) {
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if (record->event.pressed) {
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midi_starting_note++; // Change key
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midi_send_cc(&midi_device, 0, 0x7B, 0);
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}
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return false;
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}
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if (record->event.key.col == (MATRIX_COLS - 2) && record->event.key.row == (MATRIX_ROWS - 1)) {
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if (record->event.pressed) {
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midi_starting_note--; // Change key
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midi_send_cc(&midi_device, 0, 0x7B, 0);
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}
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return false;
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}
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if (record->event.key.col == (MATRIX_COLS - 3) && record->event.key.row == (MATRIX_ROWS - 1) && record->event.pressed) {
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midi_offset++; // Change scale
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midi_send_cc(&midi_device, 0, 0x7B, 0);
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return false;
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}
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if (record->event.key.col == (MATRIX_COLS - 4) && record->event.key.row == (MATRIX_ROWS - 1) && record->event.pressed) {
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midi_offset--; // Change scale
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midi_send_cc(&midi_device, 0, 0x7B, 0);
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return false;
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}
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// basic
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// uint8_t note = (midi_starting_note + SCALE[record->event.key.col + midi_offset])+12*(MATRIX_ROWS - record->event.key.row);
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// advanced
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// uint8_t note = (midi_starting_note + record->event.key.col + midi_offset)+12*(MATRIX_ROWS - record->event.key.row);
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// guitar
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uint8_t note = (midi_starting_note + record->event.key.col + midi_offset)+5*(MATRIX_ROWS - record->event.key.row);
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// violin
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// uint8_t note = (midi_starting_note + record->event.key.col + midi_offset)+7*(MATRIX_ROWS - record->event.key.row);
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if (record->event.pressed) {
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// midi_send_noteon(&midi_device, record->event.key.row, midi_starting_note + SCALE[record->event.key.col], 127);
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midi_send_noteon(&midi_device, 0, note, 127);
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} else {
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// midi_send_noteoff(&midi_device, record->event.key.row, midi_starting_note + SCALE[record->event.key.col], 127);
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midi_send_noteoff(&midi_device, 0, note, 127);
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}
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if (keycode < 0xFF) // ignores all normal keycodes, but lets RAISE, LOWER, etc through
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return false;
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}
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#endif
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return true;
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}
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