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AcidBanger.ino
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AcidBanger.ino
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#ifdef JUKEBOX
// This is The "Endless Acid Banger"
//
// Pattern generator code taken from
// https://www.vitling.xyz/toys/acid-banger/
// created by Vitling (David Whiting) i.am@thewit.ch
//
// The rest of the code by written by thement@ibawizard.net.
// Some related info probably at http://tips.ibawizard.net/
//
// This work is licensed under a Creative Commons Attribution 4.0 International License.
//
//
// What is this?
// =============
// The endless acid banger is autonomous pattern generator that spits acid-like
// note and drum sequences via MIDI.
//
// How to make this work?
// ======================
// Attach 10 buttons to Arduino (pinout specified bellow), connect serial TX
// to DIN-5 female socket (TX to pin 3 via 220 Ohm resistor, 5V to pin 4 via
// 220 Ohm resistor, GND to pin 2) and let it play.
//
// How does the interface work?
// ============================
// - "Play" button starts/stops the sequencer
// - "Gen synth1" button generates new melody for synth 1 from current note set
// - "Gen synth2" button ditto for synth 1
// - "Gen notes" creates new note set and regenerates the synth1/synth2
// melodies from it
// - "Gen drum" generates new drum pattern
// - "Mem1-5" buttons switch to different patterns. If you hold one memory and
// then press another one, the first one gets copied to the second.
//
// Have fun!
//
// ===============================
// 2023 edit by Copych
// added auto CC ramps for reso, cutoff etc.
// added drum parts categorizing
// added auto breaks/fills
// added crash cymbal
// removed/modified buttons processing
//
#define KICK_NOTE 0 //001
#define SNARE_NOTE 1 //002
#define CLOSED_HAT_NOTE CH_NUMBER //007
#define OPEN_HAT_NOTE OH_NUMBER //008
#define PERCUSSION_NOTE 11 //005
#define CRASH_NOTE 9 //010
// Pin numbers to which are buttons attached (connect one side of button to pin, the other to ground)
#define GEN_SYNTH1_BUTTON_PIN 23
#define GEN_SYNTH2_BUTTON_PIN 23
#define GEN_NOTES_BUTTON 23
#define GEN_DRUM_BUTTON 23
#define PLAY_BUTTON 0
#define MEM1_BUTTON 23
#define MEM2_BUTTON 23
#define MEM3_BUTTON 23
#define MEM4_BUTTON 23
#define MEM5_BUTTON 23
#define send_midi_start() {}
#define send_midi_stop() {}
#define send_midi_tick() {}
#define NUM_RAMPS 6 // simultaneous knob rotatings
#ifndef NO_PSRAM
#define NUM_SYNTH_CCS 12 // how many synth CC params do we have to play
#define NUM_DRUM_CCS 7 // how many drum CC params do we have to play
#define VOL_SYNTH1 100
#define VOL_SYNTH2 100
#define VOL_DRUMS 100
#else
#define NUM_SYNTH_CCS 11 // how many synth CC params do we have to play
#define NUM_DRUM_CCS 5 // how many drum CC params do we have to play
#define VOL_SYNTH1 100
#define VOL_SYNTH2 100
#define VOL_DRUMS 100
#endif
uint8_t current_drumkit = (DEFAULT_DRUMKIT*12); // offset for drum note numbers (instruments are groupped by 12)
struct sSynthCCs {
uint8_t cc_number;
uint8_t cc_couple;
uint8_t cc_default_value;
uint8_t cc_min_value;
uint8_t cc_max_value;
bool reset_after_use;
};
sSynthCCs synth1_ramps[NUM_SYNTH_CCS] = {
//cc cpl def min max reset
#ifndef NO_PSRAM
{CC_303_REVERB_SEND, 0, 5, 2, 127, true},
#endif
{CC_303_PAN, 0, 47, 0, 127, true},
{CC_303_WAVEFORM, 0, 0, 0, 64, true}, // SQUARE
{CC_303_RESO, CC_303_CUTOFF, 64, 40, 125, true},
{CC_303_CUTOFF, CC_303_RESO, 30, 0, 127, true},
{CC_303_DECAY, 0, 20, 15, 64, true},
{CC_303_ATTACK, 0, 1, 3, 10, true},
{CC_303_ENVMOD_LVL, 0, 100, 0, 127, false},
{CC_303_ACCENT_LVL, 0, 10, 0, 70, true},
{CC_303_DELAY_SEND, 0, 0, 64, 127, false},
{CC_303_DISTORTION, 0, 0, 0, 3, true},
{CC_303_OVERDRIVE, 0, 5, 0, 50, true}
};
sSynthCCs synth2_ramps[NUM_SYNTH_CCS] = {
//cc cpl def min max reset
#ifndef NO_PSRAM
{CC_303_REVERB_SEND, 0, 5, 2, 127, true},
#endif
{CC_303_RESO, CC_303_CUTOFF, 64, 60, 127, true},
{CC_303_CUTOFF, CC_303_RESO, 20, 0, 100, false},
{CC_303_PAN, 0, 80, 0, 127, true},
{CC_303_ENVMOD_LVL, 0, 100, 15, 127, false},
{CC_303_WAVEFORM, 0, 127, 64, 127, true}, // SAW
{CC_303_DELAY_SEND, 0, 0, 64, 127, false},
{CC_303_ACCENT_LVL, 0, 0, 0, 127, true},
{CC_303_DECAY, 0, 20, 15, 64, true},
{CC_303_ATTACK, 0, 1, 3, 15, true},
{CC_303_OVERDRIVE, 0, 0, 0, 0, true},
{CC_303_DISTORTION, 0, 20, 0, 40, true}
};
sSynthCCs drum_ramps[NUM_DRUM_CCS] = {
//cc cpl def min max reset
#ifndef NO_PSRAM
{CC_808_REVERB_SEND, 0, 5, 30, 127, true}, // reverb is not available with no psram
{CC_808_DELAY_SEND, 0, 0, 64, 127, true}, // delay for drums needs more delay time (read 'RAM') than we can afford
#endif
{CC_808_CUTOFF, 0, 64, 64, 127, true},
{CC_808_RESO, 0, 64, 0, 127, true},
{CC_808_SD_TONE, 0, 64, 64, 127, true},
{CC_808_BD_DECAY, 0, 127, 50, 127, true},
{CC_808_BD_TONE, 0, 64, 40, 64, true}
};
struct sMidiRamp {
uint8_t chan = 0;
uint8_t cc_number = 0;
float value = 0.0f;
float min_val = 0.0f;
float max_val = 127.0f;
float def_val = 64.0f;
bool need_reset = false;
float stepPer16th = 0.0f;
int16_t leftBars = 0;
} midiRamps[NUM_RAMPS];
typedef enum drum_kinds {
DrumBreak,
DrumStraight,
DrumHang,
DrumAny,
DrumNone
} drum_kinds ;
enum {
KickElectro,
KickFourFloor,
KickBigbeat,
KickNone,
/* anything bellow this line will never be picked */
};
enum {
SnareBackbeat,
SnareSkip,
SnareFill,
SnareBreak,
SnareStraight,
SnareNone,
/* anything bellow this line will never be picked */
};
enum {
HatsOffbeats,
HatsClosed,
HatsPop,
HatsPat1,
HatsNone,
/* anything bellow this line will never be picked */
};
enum {
PercFiller,
PercXor1,
PercXor2,
PercEcho,
PercRolls,
PercNone,
/* anything bellow this line will never be picked */
};
enum {
NumInstruments = 2 + 6,
AccentedMidiVol = 120,
NormalMidiVol = 70,
};
enum {
NumMemories = 5,
MaxNoteSet = 16,
PatternLength = 16,
};
enum {
ButPat1 = 0,
ButNotes = 2,
ButDrums = 3,
ButPlay = 4,
ButMem1 = 5,
ButLast = ButMem1 + NumMemories,
};
typedef struct Pattern Pattern;
typedef struct Memory Memory;
typedef struct Instrument Instrument;
typedef enum {sIdle, sPlaying} bStatus;
struct Button {
uint8_t history;
byte pin;
uint8_t numb;
};
struct Instrument {
// 1-base indexed MIDI channel (first channel is 1)
byte midi_channel;
byte is_drum, drum_note;
void (*noteon)(byte chan, byte note, byte vel);
void (*noteoff)(byte chan, byte note);
byte playing_note;
};
static Instrument instruments[NumInstruments];
static uint32_t bar_current = 0; // it counts bars
struct sBreak {
bStatus status = sIdle;
byte length = 0;
uint32_t start = 0;
uint32_t after = 0;
} Break;
struct Pattern {
uint16_t accent, glide;
uint8_t notes[PatternLength];
};
struct Memory {
Pattern patterns[NumInstruments];
byte note_set[MaxNoteSet];
byte num_notes_in_set;
uint16_t random_seed;
};
static Memory memories[NumMemories];
static byte cur_memory;
#define is_pressed(x) (buttons[x].history == 0)
#define just_pressed(x) (buttons[x].history == 0x80)
static struct Button buttons[ButLast];
static byte button_divider;
static unsigned long now;
static unsigned long last_midi_tick;
static const byte button_pins[ButLast] = {
GEN_SYNTH1_BUTTON_PIN,
GEN_SYNTH2_BUTTON_PIN,
GEN_NOTES_BUTTON,
GEN_DRUM_BUTTON,
PLAY_BUTTON,
MEM1_BUTTON,
MEM2_BUTTON,
MEM3_BUTTON,
MEM4_BUTTON,
MEM5_BUTTON,
};
static void send_midi_noteon(byte chan, byte note, byte vol) {
#ifdef MIDI_VIA_SERIAL
MIDI.sendNoteOn(note, vol, chan);
#endif
#ifdef MIDI_VIA_SERIAL2
MIDI2.sendNoteOn(note, vol, chan);
#endif
handleNoteOn( chan, note, vol) ;
}
static void send_midi_noteoff(byte chan, byte note) {
#ifdef MIDI_VIA_SERIAL
MIDI.sendNoteOn(note, 0, chan);
#endif
#ifdef MIDI_VIA_SERIAL2
MIDI2.sendNoteOn(note, 0, chan);
#endif
handleNoteOff( chan, note, 0) ;
}
static void init_midi() {
// Serial.begin(115200);
// MIDI.begin(MIDI_CHANNEL_OMNI);
pinMode(LED_BUILTIN, OUTPUT);
for (int i = 0; i < ButLast; i++) {
init_button(&buttons[i], button_pins[i], i + 1 );
}
init_instruments();
init_patterns();
#ifdef JUKEBOX_PLAY_ON_START
do_midi_start();
#endif
}
static void send_midi_control(byte chan, byte cc_number, byte cc_value) {
//MIDI.sendControlChange ( cc_number, cc_value, chan);
handleCC( chan, cc_number, cc_value);
}
/*
Pseudo-random generator with restorable state
*/
static inline uint16_t lfsr16_next(uint16_t x)
{
uint16_t y = x >> 1;
if (x & 1)
y ^= 0xb400;
return y;
}
union seeder_t {
double dseed= 0.9876543021203450678091203456/random(3,0xffff);
struct{
uint8_t x;
uint16_t useed ;
};
} seeder ;
//static uint16_t myRandomState = 0x1234;
static uint16_t myRandomState = seeder.useed ;
static uint16_t myRandomAddEntropy(uint16_t data) {
myRandomState = lfsr16_next((myRandomState << 1) ^ data);
return myRandomState;
}
static uint16_t myRandomRaw() {
myRandomState = lfsr16_next(myRandomState);
return myRandomState;
}
static inline uint16_t myRandom(uint16_t max) {
if (max==0) return 0;
return myRandomRaw() % max;
}
/*
Buttons
*/
static void read_button(struct Button *button)
{
if (button->numb == 5) { // start/stop is a real button "boot" ( GPIO0 )
button->history = (button->history << 1) | (digitalRead(button->pin) == HIGH);
} else {
button->history = 0;
}
}
static void init_button(struct Button *button, byte pin, uint8_t num)
{
button->history = 0xff;
button->pin = pin;
button->numb = num;
pinMode(pin, INPUT_PULLUP);
}
/*
Instruments
*/
static void instr_noteoff(byte instr) {
Instrument *ins = &instruments[instr];
if (ins->playing_note != 0) {
if (ins->noteoff != NULL)
ins->noteoff(ins->midi_channel, ins->playing_note);
ins->playing_note = 0;
}
}
static void instr_allnotesoff() {
for (int i = 0; i < NumInstruments; i++) {
instr_noteoff(i);
}
}
static void instr_noteon_raw(byte instr, byte note, byte vol, byte do_glide) {
Instrument *ins = &instruments[instr];
// All instruments are monophonic, so noteoff before noteon
if (ins->playing_note != 0) {
if (do_glide && !ins->is_drum) {
// Implement glide by playing two notes at once. Also known as "fingered glide"
if (ins->noteon != NULL)
ins->noteon(ins->midi_channel, note, vol);
instr_noteoff(instr);
ins->playing_note = note;
return;
}
instr_noteoff(instr);
}
if (ins->noteon != NULL)
ins->noteon(ins->midi_channel, note, vol);
ins->playing_note = note;
}
static void instr_noteon(byte instr, byte value, byte do_glide, byte do_accent) {
Instrument *ins = &instruments[instr];
#ifdef DEBUG_JUKEBOX_
DEBF("glide=%d accent=%d\r\n", do_glide, do_accent);
#endif
if (ins->is_drum) {
// For drums: value is volume, accent and glide are ignored
instr_noteon_raw(instr, current_drumkit + ins->drum_note, value, 0);
} else {
// For non-drums: value is note, volume is accent, glide is used
instr_noteon_raw(instr, value, do_accent ? AccentedMidiVol : NormalMidiVol, do_glide);
}
}
/*
Sequencer
*/
void sequencer_step(byte step) {
#ifdef MIDI_RAMPS
do_midi_ramps();
#endif
#ifdef DEBUG_JUKEBOX_
DEBF("midi step %d\r\n", step);
#endif
// Play all notes in current step
for (int i = 0; i < NumInstruments; i++) {
Pattern *pat = &memories[cur_memory].patterns[i];
byte accent = (pat->accent >> step) & 1;
byte glide = (pat->glide >> step) & 1;
byte value = pat->notes[step];
if (value > 0)
instr_noteon(i, value, glide, accent);
else
instr_noteoff(i);
}
if (Break.after == bar_current && step == 0) {
instr_noteon(NumInstruments - 1, 127, 0, 0);
// instr_noteon_raw(NumInstruments-1, CRASH_NOTE, 127, 0);
if (flip(30)) {
//change drumkit
current_drumkit = myRandom(((Drums.GetSamplesCount()-1)/12)) * 12 ;
//#ifdef DEBUG_JUKEBOX
DEBF("Selected drumkit: %d\r\n" , current_drumkit);
//#endif
}
#ifdef DEBUG_JUKEBOX
DEBUG("CRASH!!!!!!!!!!!!!!!!!!!!!");
#endif
#ifdef MIDI_RAMPS
check_midi_ramps(true);
#endif
}
if (step % 4 == 0 || step == 1) {
digitalWrite(LED_BUILTIN, HIGH);
#ifdef LOLIN_RGB
pixels.setPixelColor(0, pixels.Color(rand() % 32, rand() % 32, rand() % 32));
pixels.show();
#endif
#ifdef DEBUG_JUKEBOX
DEBUG(step);
#endif
} else {
digitalWrite(LED_BUILTIN, LOW);
#ifdef LOLIN_RGB
pixels.setPixelColor(0, pixels.Color(0,0,0));
pixels.show();
#endif
}
}
/*
Endless Acid Banger pattern generator
Adapted from https://www.vitling.xyz/toys/acid-banger/
created by Vitling (David Whiting) i.am@thewit.ch
*/
#define NOTE_LIST(x...) (int8_t[]) { x, -1 }
//#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
static const int8_t *const offset_choices[] = {
NOTE_LIST(0, 0, 12, 24, 27),
NOTE_LIST(0, 0, 0, 12, 10, 19, 26, 27),
NOTE_LIST(0, 0, 0, 1, 7, 10, 12, 13),
NOTE_LIST(0),
NOTE_LIST(0, 0, 0, 0, 0, 0, 1, 13, 25),
NOTE_LIST(0, 0, 0, 12, 24),
NOTE_LIST(0, 0, 12, 12, 18, 24, 24),
NOTE_LIST(0, 0, 7, 14, 24, 24),
NOTE_LIST(0, 0, 12, 14, 15, 19),
NOTE_LIST(0, 0, 0, 12, 12, 13, 16, 19, 22, 24, 25),
NOTE_LIST(0, 0, 0, 7, 12, 15, 17, 20, 24),
};
static byte generate_note_set(uint8_t *note_set) {
// Random root note
byte root = myRandom(15) + 28;
// Random note set
byte set = myRandom(ARRAY_SIZE(offset_choices));
// Copy notes from note set and offset them by "root note"
int i;
for (i = 0; i < MaxNoteSet; i++) {
int8_t note = offset_choices[set][i];
if (note < 0)
break;
*note_set++ = root + note;
}
return i;
}
// Flip a coin
static byte flip(byte percent_chance) {
return myRandom(100) < percent_chance;
}
static void generate_melody(uint8_t *note_set, byte note_set_len,
uint8_t *pattern, byte pattern_len,
uint16_t *accent, uint16_t *glide) {
uint8_t density = 255;
*accent = 0;
*glide = 0;
for (int i = 0; i < pattern_len; i++) {
// uint8_t chance = ((uint16_t) density * (i % 4 == 0 ? 60 : (i % 3 == 0 ? 50 : (i % 2 == 0 ? 30 : 10)))) >> 8;
uint8_t chance = ((uint16_t) density * (i % 4 == 0 ? 90 : (i % 3 == 0 ? 80 : (i % 2 == 0 ? 50 : 10)))) >> 8;
if (flip(chance)) {
pattern[i] = note_set[myRandom(note_set_len)];
if (flip(30))
*accent |= 1u << i;
if (flip(70))
*glide |= 1u << i;
} else {
pattern[i] = 0;
}
}
}
static void generate_drums(byte *kick, byte *snare, byte *oh, byte *ch, byte *perc, byte *crash, drum_kinds drum_kind );
static void generate_drums(byte *kick, byte *snare, byte *oh, byte *ch, byte *perc, byte *crash, drum_kinds drum_kind ) {
memset(kick, 0, PatternLength); // zero patterns
memset(snare, 0, PatternLength);
memset(oh, 0, PatternLength);
memset(ch, 0, PatternLength);
memset(perc, 0, PatternLength);
byte kick_mode = KickNone;
byte hat_mode = HatsNone;
byte snare_mode = SnareNone;
byte perc_mode = PercNone;
byte rndVal ;
switch (drum_kind) {
case DrumBreak:
rndVal = myRandom(100);
if (rndVal < 10) {
kick_mode = KickBigbeat;
} else if (rndVal < 60) {
kick_mode = KickFourFloor;
} else {
kick_mode = KickNone;
}
rndVal = myRandom(100);
if (rndVal < 40) {
snare_mode = SnareFill;
} else if (rndVal < 80) {
snare_mode = SnareBreak;
} else {
snare_mode = SnareBackbeat;
}
hat_mode = myRandom(HatsNone);
perc_mode = myRandom(PercNone);
break;
case DrumStraight:
rndVal = myRandom(100);
if (rndVal < 20) {
kick_mode = KickBigbeat;
} else {
kick_mode = KickFourFloor;
}
rndVal = myRandom(100);
if (rndVal < 60) {
snare_mode = SnareStraight;
} else {
snare_mode = SnareBackbeat;
}
if (flip(70)) hat_mode = HatsPop;
else hat_mode = myRandom(HatsNone);
perc_mode = myRandom(PercNone);
break;
case DrumHang:
rndVal = myRandom(100);
if (rndVal < 50) {
kick_mode = KickBigbeat;
} else {
kick_mode = KickNone;
}
rndVal = myRandom(100);
if (rndVal < 60) {
snare_mode = SnareStraight;
} else {
snare_mode = SnareBackbeat;
}
hat_mode = myRandom(HatsNone);
perc_mode = myRandom(PercNone);
break;
case DrumNone:
// nothing
break;
case DrumAny:
default:
kick_mode = myRandom(KickNone);
hat_mode = myRandom(HatsNone);
snare_mode = myRandom(SnareNone);
perc_mode = myRandom(PercNone);
}
if (kick_mode == KickFourFloor) {
for (int i = 0; i < PatternLength; i++) {
if (i % 4 == 0)
kick[i] = 120;
}
} else if (kick_mode == KickElectro) {
for (int i = 0; i < PatternLength; i++) {
if (i == 0)
kick[i] = 127;
else if (i % 2 == 0 && i % 8 != 4 && flip(50))
kick[i] = myRandom(110);
else if (flip(5))
kick[i] = myRandom(110);
}
} else if (kick_mode == KickBigbeat) {
for (int i = 0; i < PatternLength; i++) {
if (i == 0)
kick[i] = 127;
else if (i == 14 && flip(20))
kick[i] = myRandom(80);
}
}
if (snare_mode == SnareBackbeat) {
for (int i = 0; i < PatternLength; i++) {
if (i % 8 == 0)
snare[i] = 110;
}
} else if (snare_mode == SnareFill) {
for (int i = 0; i < PatternLength; i++) {
snare[i] = 120;
}
} else if (snare_mode == SnareStraight) {
for (int i = 0; i < PatternLength; i++) {
if (i % 8 == 4)
snare[i] = 80;
}
} else if (snare_mode == SnareBreak) {
for (int i = 0; i < PatternLength; i++) {
switch (i) {
case 2:
case 8:
break;
case 4:
case 5:
case 6:
case 10:
snare[i] = myRandom(100);
break;
default:
snare[i] = 120;
}
}
} else if (snare_mode == SnareSkip) {
for (int i = 0; i < PatternLength; i++) {
if (i % 8 == 3 || i % 8 == 6)
snare[i] = 90 + myRandom(37);
else if (i % 2 == 0 && flip(20))
snare[i] = 40 + myRandom(25);
else if (flip(10))
snare[i] = 25 + myRandom(25);
}
}
if (hat_mode == HatsOffbeats) {
for (int i = 0; i < PatternLength; i++) {
if (i % 4 == 2)
oh[i] = 50;
else if (flip(30)) {
if (flip(50))
ch[i] = myRandom(25);
else
oh[i] = myRandom(25);
}
}
} else if (hat_mode == HatsClosed) {
for (int i = 0; i < PatternLength; i++) {
if (i % 2 == 0)
ch[i] = 50;
else if (flip(50))
ch[i] = myRandom(40);
}
} else if (hat_mode == HatsPop) {
for (int i = 0; i < PatternLength; i++) {
if (i % 4 == 2)
oh[i] = 60;
else {
ch[i] = 40 + myRandom(40);
}
}
} else if (hat_mode == HatsPat1) {
for (int i = 0; i < PatternLength; i++) {
if (i % 8 != 1 && i % 8 != 4 && i % 8 != 7 )
ch[i] = 80;
}
}
if (perc_mode == PercFiller) {
for (int i = 0; i < PatternLength; i++) {
if (oh[i] == 0 && ch[i] == 0 && kick[i] == 0 && snare[i] == 0)
perc[i] = 50 + myRandom(37);
}
} else if (perc_mode == PercXor1) {
for (int i = 0; i < PatternLength; i++) {
if ((kick[i] == 0) ^ (snare[i] == 0))
perc[i] = 50 + myRandom(37);
}
} else if (perc_mode == PercXor2) {
for (int i = 0; i < PatternLength; i++) {
if ((oh[i] == 0) ^ (ch[i] == 0))
perc[i] = 50 + myRandom(37);
}
} else if (perc_mode == PercEcho) {
byte distance = 1 + myRandom(7);
for (int i = 0; i < PatternLength; i++) {
byte prev_step = (i + PatternLength - distance) % PatternLength;
if (ch[prev_step] || oh[prev_step])
perc[i] = 50 + myRandom(37);
}
} else if (perc_mode == PercRolls) {
byte roll = 0, roll_vol = 0;
for (int i = 0; i < PatternLength; i++) {
byte do_roll = 0;
if (i % 8 == 3 && flip(40))
do_roll = 1;
else if (i % 2 == 0 && flip(20))
do_roll = 1;
else if (flip(10))
do_roll = 1;
if (do_roll) {
roll_vol = 50 + myRandom(37);
roll = 4;
}
if (roll > 0) {
perc[i] = roll_vol;
roll_vol /= 2;
roll--;
}
}
}
}
/*
Generator-to-pattern binding
*/
void mem_generate_melody(byte mem, byte voice) {
Memory *m = &memories[mem];
Pattern *p = &m->patterns[voice];
// Temporarily change random seed to a pre-defined state so that we can generate
// identical melody.
uint16_t random_state = myRandomState;
myRandomState = (m->random_seed << 1) ^ voice;
#ifdef DEBUG_JUKEBOX_
DEBF("generating %d/%d with seed %u \r\n", mem, voice, myRandomState);
#endif
generate_melody(
m->note_set, m->num_notes_in_set,
p->notes, sizeof(p->notes),
&p->accent, &p->glide);
myRandomState = random_state;
}
void mem_generate_melody_and_seed(byte mem, byte voice) {
Memory *m = &memories[mem];
m->random_seed = myRandomRaw();
mem_generate_melody(mem, voice);
}
void mem_generate_note_set(byte mem) {
Memory *m = &memories[mem];
m->num_notes_in_set = generate_note_set(m->note_set);
for (int i = 0; i < 2; i++)
mem_generate_melody(mem, i);
}
void mem_generate_drums(byte mem, enum drum_kinds drum_kind);
void mem_generate_drums(byte mem, enum drum_kinds drum_kind) {
Memory *m = &memories[mem];
generate_drums(
m->patterns[2].notes,
m->patterns[3].notes,
m->patterns[5].notes,
m->patterns[4].notes,
m->patterns[6].notes,
m->patterns[7].notes,
drum_kind);
}
void mem_generate_all(byte mem) {
mem_generate_note_set(mem);
mem_generate_drums(mem, DrumStraight);
for (int i = 0; i < 2; i++)
mem_generate_melody_and_seed(mem, i);
}
void print_pattern(struct Pattern *p, byte is_drum) {
#ifdef DEBUG_JUKEBOX
for (int i = 0; i < PatternLength; i++)
DEBF("%3d ", p->notes[i]);
if (!is_drum) {
for (int i = 0; i < PatternLength; i++)
DEBF(" %c%c \r\n", (p->accent & (1u << i)) ? 'A' : ' ', (p->glide & (1u << i)) ? '~' : ' ');
}
#endif
}
void print_memory(byte mem) {
Memory *m = &memories[mem];
#ifdef DEBUG_JUKEBOX
DEBF("--- memory %d ---", mem);
DEBF("noteset[%d]:", m->num_notes_in_set);
#endif
for (int i = 0; i < m->num_notes_in_set; i++)
#ifdef DEBUG_JUKEBOX
DEBF(" %d", m->note_set[i]);
#endif
for (int i = 0; i < NumInstruments; i++)
print_pattern(&m->patterns[i], instruments[i].is_drum);
}
void init_patterns() {
for (int i = 0; i < NumMemories; i++)
mem_generate_all(i);
}
/*
MIDI clock
*/
#define MIDI_TICKS_PER_16TH 1
static byte midi_playing, midi_tick, midi_step;
const float tick_coef = 1000ul * 15 / MIDI_TICKS_PER_16TH;
static unsigned long midi_tick_ms = tick_coef / bpm;
inline void set_bpm(float newBpm) {
bpm = newBpm;
midi_tick_ms = tick_coef / newBpm;
}
static void decide_on_break() {
uint32_t bars_played = bar_current - Break.after ;
if ( Break.status == sIdle ) {
// plan a break ?
if ( bars_played == 28 ) {
// 100% 1-bar break
Break.status = sPlaying;
Break.start = bar_current ;
Break.length = 4;
Break.after = Break.start + Break.length;
} else if ( bars_played == 15 ) {
// 50% 1-bar break
if (flip(20)) {
Break.status = sPlaying;
Break.start = bar_current ;
Break.length = 1;
Break.after = Break.start + Break.length;
}
} else if (bars_played == 14) {
if (flip(15)) {
// 2-bars break
Break.status = sPlaying;
Break.start = bar_current ;
Break.length = 2;
Break.after = Break.start + Break.length;
}
} else if (bars_played == 13) {
if (flip(15)) {
// 3-bars break
Break.status = sPlaying;
Break.start = bar_current ;
Break.length = 3;
Break.after = Break.start + Break.length;
}
} else if (bars_played == 12) {
if (flip(15)) {
// 4-bars break
Break.status = sPlaying;
Break.start = bar_current ;
Break.length = 4;
Break.after = Break.start + Break.length;
}
} else if (bars_played == 7) {
if (flip(15)) {
// 1-bar break
Break.status = sPlaying;
Break.start = bar_current ;
Break.length = 1;
Break.after = Break.start + Break.length;
}
} else if (bars_played == 6) {
if (flip(15)) {
// 2-bars break
Break.status = sPlaying;
Break.start = bar_current ;
Break.length = 2;
Break.after = Break.start + Break.length;
}
} else if (bars_played == 3) {
if (flip(10)) {
// 1-bar break
Break.status = sPlaying;
Break.start = bar_current ;
Break.length = 1;
Break.after = Break.start + Break.length;
}
}
if (Break.start == bar_current ) mem_generate_drums(cur_memory, DrumBreak);
} else { // Break.status != sIdle
if (Break.after == bar_current) {
Break.status = sIdle;
mem_generate_drums(cur_memory, DrumStraight);
if (flip(10)) mem_generate_drums(cur_memory, DrumHang);
if (flip(80)) mem_generate_melody_and_seed(cur_memory, 0);
if (flip(60)) mem_generate_melody_and_seed(cur_memory, 1);
if (flip(15)) mem_generate_note_set(cur_memory);
}
}// Break.status ?? sIdle ?
#ifdef DEBUG_JUKEBOX
DEBF("bar=%d break.len=%d break.status=%d \r\n", bars_played, Break.length, Break.status);
#endif
}
static void do_midi_start() {
midi_playing = 1;
midi_tick = MIDI_TICKS_PER_16TH - 1;
midi_step = -1;
send_midi_control(SYNTH1_MIDI_CHAN, 10, 10);