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- /* Copyright 2020 Rodolphe Belouin
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #pragma once
-
- #include <stdbool.h>
- #include "debug.h"
- #include "timer.h"
-
- // Maximum number of steps: 256
- #ifndef SEQUENCER_STEPS
- # define SEQUENCER_STEPS 16
- #endif
-
- // Maximum number of tracks: 8
- #ifndef SEQUENCER_TRACKS
- # define SEQUENCER_TRACKS 8
- #endif
-
- #ifndef SEQUENCER_TRACK_THROTTLE
- # define SEQUENCER_TRACK_THROTTLE 3
- #endif
-
- #ifndef SEQUENCER_PHASE_RELEASE_TIMEOUT
- # define SEQUENCER_PHASE_RELEASE_TIMEOUT 30
- #endif
-
- /**
- * Make sure that the items of this enumeration follow the powers of 2, separated by a ternary variant.
- * Check the implementation of `get_step_duration` for further explanation.
- */
- typedef enum { SQ_RES_2, SQ_RES_2T, SQ_RES_4, SQ_RES_4T, SQ_RES_8, SQ_RES_8T, SQ_RES_16, SQ_RES_16T, SQ_RES_32, SEQUENCER_RESOLUTIONS } sequencer_resolution_t;
-
- typedef struct {
- bool enabled;
- uint8_t steps[SEQUENCER_STEPS];
- uint16_t track_notes[SEQUENCER_TRACKS];
- uint8_t tempo; // Is a maximum tempo of 255 reasonable?
- sequencer_resolution_t resolution;
- } sequencer_config_t;
-
- /**
- * Because Digital Audio Workstations get overwhelmed when too many MIDI signals are sent concurrently,
- * We use a "phase" state machine to delay some of the events.
- */
- typedef enum sequencer_phase_t {
- SEQUENCER_PHASE_ATTACK, // t=0ms, send the MIDI note on signal
- SEQUENCER_PHASE_RELEASE, // t=SEQUENCER_PHASE_RELEASE_TIMEOUT ms, send the MIDI note off signal
- SEQUENCER_PHASE_PAUSE // t=step duration ms, loop
- } sequencer_phase_t;
-
- typedef struct {
- uint8_t active_tracks;
- uint8_t current_track;
- uint8_t current_step;
- uint16_t timer;
- sequencer_phase_t phase;
- } sequencer_state_t;
-
- extern sequencer_config_t sequencer_config;
-
- // We expose the internal state to make the feature more "unit-testable"
- extern sequencer_state_t sequencer_internal_state;
-
- bool is_sequencer_on(void);
- void sequencer_toggle(void);
- void sequencer_on(void);
- void sequencer_off(void);
-
- void sequencer_set_track_notes(const uint16_t track_notes[SEQUENCER_TRACKS]);
-
- bool is_sequencer_track_active(uint8_t track);
- void sequencer_set_track_activation(uint8_t track, bool value);
- void sequencer_toggle_track_activation(uint8_t track);
- void sequencer_toggle_single_active_track(uint8_t track);
-
- #define sequencer_activate_track(track) sequencer_set_track_activation(track, true)
- #define sequencer_deactivate_track(track) sequencer_set_track_activation(track, false)
-
- bool is_sequencer_step_on(uint8_t step);
- bool is_sequencer_step_on_for_track(uint8_t step, uint8_t track);
- void sequencer_set_step(uint8_t step, bool value);
- void sequencer_toggle_step(uint8_t step);
- void sequencer_set_all_steps(bool value);
-
- #define sequencer_set_step_on(step) sequencer_set_step(step, true)
- #define sequencer_set_step_off(step) sequencer_set_step(step, false)
- #define sequencer_set_all_steps_on() sequencer_set_all_steps(true)
- #define sequencer_set_all_steps_off() sequencer_set_all_steps(false)
-
- uint8_t sequencer_get_tempo(void);
- void sequencer_set_tempo(uint8_t tempo);
- void sequencer_increase_tempo(void);
- void sequencer_decrease_tempo(void);
-
- sequencer_resolution_t sequencer_get_resolution(void);
- void sequencer_set_resolution(sequencer_resolution_t resolution);
- void sequencer_increase_resolution(void);
- void sequencer_decrease_resolution(void);
-
- uint8_t sequencer_get_current_step(void);
-
- uint16_t sequencer_get_beat_duration(void);
- uint16_t sequencer_get_step_duration(void);
-
- uint16_t get_beat_duration(uint8_t tempo);
- uint16_t get_step_duration(uint8_t tempo, sequencer_resolution_t resolution);
-
- void sequencer_task(void);
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