wirtz
/
uClock
mirror of https://github.com/midilab/uClock
1
0
Fork 0
Code Issues Releases Wiki Activity

Acid step sequencer clone of Roland TB303, testing release

Browse Source
pull/7/head
midilab 7 years ago
parent 609242b8d7
commit 96f045c97a
1 changed files with 296 additions and 34 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 324
      examples/AcidStepSequencer/AcidStepSequencer.ino

324
examples/AcidStepSequencer/AcidStepSequencer.ino
Unescape View File

@ -4,29 +4,49 @@
// Sequencer config
#define STEP_MAX_SIZE 16
#define SEQUENCER_MIN_BPM 50
#define SEQUENCER_MAX_BPM 178
#define SEQUENCER_MAX_BPM 177
#define NOTE_VELOCITY 90
#define ACCENT_VELOCITY 110
// Choose only 1 mode and comment the other.
// OLD_SCHOOL_ACID_ACCENTED
// a button/led extra hardware to control steps velocity using accent only
// NEW_SCHOOL_VELOCITY_CONTROLLED
// a 10k potentiomer extra hardware to freely control steps velocity
#define OLD_SCHOOL_ACID_ACCENTED
#define NEW_SCHOOL_FREE_VELOCITY
// MIDI modes
#define MIDI_CHANNEL 0 // 0 = channel 1
#define MIDI_MODE
//#define SERIAL_MODE
// hardware setup to fit different kinda of setups and arduino models
#define OCTAVE_POT_PIN A3
#define NOTE_POT_PIN A2
#define STEP_LENGTH_POT_PIN A1
#define TEMPO_POT_PIN A0
#define PREVIOUS_STEP_BUTTON_PIN 2
#define NEXT_STEP_BUTTON_PIN 3
#define REST_BUTTON_PIN 4
#define GLIDE_BUTTON_PIN 5
#define ACCENT_BUTTON_PIN 6
#define PLAY_STOP_BUTTON_PIN 7
#define PREVIOUS_STEP_LED_PIN 8
#define NEXT_STEP_LED_PIN 9
#define REST_LED_PIN 10
#define GLIDE_LED_PIN 11
#define ACCENT_LED_PIN 12
#define PLAY_STOP_LED_PIN 13
// Sequencer data
typedef struct
{
uint8_t note;
uint8_t velocity;
bool accent;
bool glide;
bool rest;
} SEQUENCER_STEP_DATA;
SEQUENCER_STEP_DATA _sequencer[STEP_MAX_SIZE];
uint16_t _last_step = 0;
bool _playing = false;
uint16_t _step, _last_step, _step_edit = 0;
uint16_t _step_length = STEP_MAX_SIZE;
// MIDI clock, start, stop, note on and note off byte definitions - based on MIDI 1.0 Standards.
#define MIDI_CLOCK 0xF8
@ -35,22 +55,34 @@ uint16_t _last_step = 0;
#define NOTE_ON 0x90
#define NOTE_OFF 0x80
// User Interface data
// 6 buttons to keep last value track
uint8_t _button_state[6] = {1};
// 4 10k potentiometers to keep lasta value track
uint16_t _pot_state[4] = {0};
uint8_t _last_octave = 3;
uint8_t _last_note = 0;
// for interrupted control access of shared memory data
uint8_t _tmpSREG;
void sendMidiMessage(uint8_t command, uint8_t byte1, uint8_t byte2)
{
// send midi message
command = command | (uint8_t)MIDI_CHANNEL;
Serial.write(command);
Serial.write(byte1);
Serial.write(byte2);
}
// The callback function wich will be called by uClock each Pulse of 16PPQN clock resolution.
// At this resolution each call represents exactly one step.
// Each call represents exactly one step here.
void ClockOut16PPQN(uint32_t * tick)
{
uint16_t step;
uint8_t velocity = NOTE_VELOCITY;
// get actual step.
step = *tick % STEP_MAX_SIZE;
_step = *tick % _step_length;
// send note off for the last step note on if we had send it on last ClockOut16PPQN() call and if this step are not in glide mode also.
if ( _sequencer[_last_step].rest == false && _sequencer[_last_step].glide == false ) {
@ -58,23 +90,26 @@ void ClockOut16PPQN(uint32_t * tick)
}
// send note on only if this step are not in rest mode
if ( _sequencer[step].rest == false ) {
sendMidiMessage(NOTE_ON, _sequencer[step].note, _sequencer[step].velocity);
if ( _sequencer[_step].rest == false ) {
if ( _sequencer[_step].accent == true ) {
velocity = ACCENT_VELOCITY;
}
sendMidiMessage(NOTE_ON, _sequencer[_step].note, velocity);
}
// time to let glide go away? be shure to send glided note off before the _last_step send his note off
// time to let glide go away? be shure to send glided note off after the actual step send his note on
// same note? do not send note off
if ( _sequencer[_last_step].glide == true && _sequencer[step].note != _sequencer[_last_step].note ) {
if ( _sequencer[_last_step].glide == true && _sequencer[_step].note != _sequencer[_last_step].note ) {
sendMidiMessage(NOTE_OFF, _sequencer[_last_step].note, 0);
}
_last_step = step;
_last_step = _step;
}
// The callback function wich will be called by uClock each Pulse of 96PPQN clock resolution.
void ClockOut96PPQN(uint32_t * tick)
{
// Send MIDI_CLOCK to external gears
// Send MIDI_CLOCK to external hardware
Serial.write(MIDI_CLOCK);
}
@ -82,18 +117,56 @@ void ClockOut96PPQN(uint32_t * tick)
void onClockStart()
{
Serial.write(MIDI_START);
_playing = true;
}
// The callback function wich will be called when clock stops by using Clock.stop() method.
void onClockStop()
{
Serial.write(MIDI_STOP);
sendMidiMessage(NOTE_OFF, _sequencer[_last_step].note, 0);
sendMidiMessage(NOTE_OFF, _sequencer[_step].note, 0);
_playing = false;
}
void configureInterface()
{
// Buttons config
// use internal pullup for buttons
pinMode(PREVIOUS_STEP_BUTTON_PIN, INPUT_PULLUP);
pinMode(NEXT_STEP_BUTTON_PIN, INPUT_PULLUP);
pinMode(REST_BUTTON_PIN, INPUT_PULLUP);
pinMode(GLIDE_BUTTON_PIN, INPUT_PULLUP);
pinMode(ACCENT_BUTTON_PIN, INPUT_PULLUP);
pinMode(PLAY_STOP_BUTTON_PIN, INPUT_PULLUP);
// Leds config
pinMode(PREVIOUS_STEP_LED_PIN, OUTPUT);
pinMode(NEXT_STEP_LED_PIN, OUTPUT);
pinMode(REST_LED_PIN, OUTPUT);
pinMode(GLIDE_LED_PIN, OUTPUT);
pinMode(ACCENT_LED_PIN, OUTPUT);
pinMode(PLAY_STOP_LED_PIN, OUTPUT);
digitalWrite(PREVIOUS_STEP_LED_PIN, LOW);
digitalWrite(NEXT_STEP_LED_PIN, LOW);
digitalWrite(REST_LED_PIN, LOW);
digitalWrite(GLIDE_LED_PIN, LOW);
digitalWrite(ACCENT_LED_PIN, LOW);
digitalWrite(PLAY_STOP_LED_PIN, LOW);
}
void setup()
{
// Initialize serial communication at 31250 bits per second, the default MIDI serial speed communication:
// Initialize serial communication
#ifdef MIDI_MODE
// the default MIDI serial speed communication at 31250 bits per second
Serial.begin(31250);
#endif
#ifdef SERIAL_MODE
// for usage with a PC with a serial to MIDI bridge
Serial.begin(115200);
#endif
// Inits the clock
uClock.init();
@ -114,27 +187,216 @@ void setup()
// initing sequencer data
for ( uint16_t i = 0; i < STEP_MAX_SIZE; i++ ) {
_sequencer[i].note = 36;
_sequencer[i].velocity = NOTE_VELOCITY;
_sequencer[i].accent = false;
_sequencer[i].glide = false;
_sequencer[i].rest = false;
}
// pins, buttons, leds and pots config
configureInterface();
}
bool pressed(uint8_t button_pin)
{
uint8_t value;
uint8_t * last_value;
switch(button_pin) {
case PREVIOUS_STEP_BUTTON_PIN:
last_value = &_button_state[0];
break;
case NEXT_STEP_BUTTON_PIN:
last_value = &_button_state[1];
break;
case REST_BUTTON_PIN:
last_value = &_button_state[2];
break;
case GLIDE_BUTTON_PIN:
last_value = &_button_state[3];
break;
case ACCENT_BUTTON_PIN:
last_value = &_button_state[4];
break;
case PLAY_STOP_BUTTON_PIN:
last_value = &_button_state[5];
break;
default:
return false;
}
value = digitalRead(button_pin);
// check, using pullup pressed button goes LOW
if ( value != *last_value && value == LOW ) {
*last_value = value;
return true;
} else {
*last_value = value;
return false;
}
}
int16_t getPotChanges(uint8_t pot_pin, uint16_t min_value, uint16_t max_value)
{
uint16_t value;
uint16_t * last_value;
switch(pot_pin) {
case OCTAVE_POT_PIN:
last_value = &_pot_state[0];
break;
case NOTE_POT_PIN:
last_value = &_pot_state[1];
break;
case STEP_LENGTH_POT_PIN:
last_value = &_pot_state[2];
break;
case TEMPO_POT_PIN:
last_value = &_pot_state[3];
break;
default:
return -1;
}
// range our value
value = (analogRead(pot_pin) / (1024 / ((max_value - min_value) + 1))) + min_value;
// check, using pullup pressed button goes LOW
if ( abs(value - *last_value) >= 1 ) {
*last_value = value;
return value;
} else {
*last_value = value;
return -1;
}
}
void processPots()
{
int8_t octave, note, step_note;
uint16_t tempo, step_length;
// process octave
if ( (octave = getPotChanges(OCTAVE_POT_PIN, 0, 10)) >= 0 ) {
_last_octave = octave;
}
if ( (note = getPotChanges(NOTE_POT_PIN, 0, 11)) >= 0 ) {
_last_note = note;
}
// changes on octave or note pot?
if ( octave != -1 || note != -1 ) {
_tmpSREG = SREG; cli();
_sequencer[_step_edit].note = (_last_octave * 8) + _last_note;
SREG = _tmpSREG;
}
/*
if ( (step_length = getPotChanges(STEP_LENGTH_POT_PIN, 1, STEP_MAX_SIZE)) >= 0 ) {
_tmpSREG = SREG; cli();
_step_length = step_length;
SREG = _tmpSREG;
}
if ( (tempo = getPotChanges(TEMPO_POT_PIN, SEQUENCER_MIN_BPM, SEQUENCER_MAX_BPM)) >= 0 ) {
uClock.setTempo(tempo);
}
*/
}
void processButtons()
{
// play/stop
if ( pressed(PLAY_STOP_BUTTON_PIN) ) {
if ( _playing == false ) {
// Starts the clock, tick-tac-tick-tac...
uClock.start();
} else {
// stop the clock
uClock.stop();
}
}
// previous step edit
if ( pressed(PREVIOUS_STEP_BUTTON_PIN) ) {
if ( _step_edit != 0 ) {
--_step_edit;
}
}
// next step edit
if ( pressed(NEXT_STEP_BUTTON_PIN) ) {
if ( _step_edit < STEP_MAX_SIZE-1 ) {
++_step_edit;
}
}
// step rest
if ( pressed(REST_BUTTON_PIN) ) {
_sequencer[_step_edit].rest = !_sequencer[_step_edit].rest;
}
// step glide
if ( pressed(GLIDE_BUTTON_PIN) ) {
_sequencer[_step_edit].glide = !_sequencer[_step_edit].glide;
}
// step accent
if ( pressed(ACCENT_BUTTON_PIN) ) {
_sequencer[_step_edit].accent = !_sequencer[_step_edit].accent;
}
}
void processLeds()
{
// Editing First Step?
if ( _step_edit == 0 ) {
digitalWrite(PREVIOUS_STEP_LED_PIN , HIGH);
} else {
digitalWrite(PREVIOUS_STEP_LED_PIN , LOW);
}
// Editing Last Step?
if ( _step_edit == _step_length-1 ) {
digitalWrite(NEXT_STEP_LED_PIN , HIGH);
} else {
digitalWrite(NEXT_STEP_LED_PIN , LOW);
}
// Rest
if ( _sequencer[_step_edit].rest == true ) {
digitalWrite(REST_LED_PIN , HIGH);
} else {
digitalWrite(REST_LED_PIN , LOW);
}
// Glide
if ( _sequencer[_step_edit].glide == true ) {
digitalWrite(GLIDE_LED_PIN , HIGH);
} else {
digitalWrite(GLIDE_LED_PIN , LOW);
}
// Accent
if ( _sequencer[_step_edit].accent == true ) {
digitalWrite(ACCENT_LED_PIN , HIGH);
} else {
digitalWrite(ACCENT_LED_PIN , LOW);
}
// Play/Stop
if ( _playing == true ) {
digitalWrite(PLAY_STOP_LED_PIN , HIGH);
} else {
digitalWrite(PLAY_STOP_LED_PIN , LOW);
}
}
// User interaction goes here
void loop()
{
// octave pot
// note pot
// tempo pot
// pattern step init pot
// pattern step size pot
// previous step button
// next step button
// rest button/led
// glide button/led
// accent button/led
processPots();
processButtons();
processLeds();
}

Write Preview
Loading…
Cancel
Save