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@ -1,3 +1,4 @@ |
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// PITCH MODE EMULATION OF ROLAND TB303
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#include "Arduino.h" |
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#include "Arduino.h" |
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#include <uClock.h> |
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#include <uClock.h> |
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@ -6,7 +7,7 @@ |
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#define SEQUENCER_MIN_BPM 50 |
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#define SEQUENCER_MIN_BPM 50 |
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#define SEQUENCER_MAX_BPM 177 |
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#define SEQUENCER_MAX_BPM 177 |
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#define NOTE_VELOCITY 90 |
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#define NOTE_VELOCITY 90 |
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#define ACCENT_VELOCITY 110 |
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#define ACCENT_VELOCITY 127 |
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// MIDI modes
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// MIDI modes
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#define MIDI_CHANNEL 0 // 0 = channel 1
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#define MIDI_CHANNEL 0 // 0 = channel 1
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@ -44,8 +45,16 @@ typedef struct |
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SEQUENCER_STEP_DATA _sequencer[STEP_MAX_SIZE]; |
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SEQUENCER_STEP_DATA _sequencer[STEP_MAX_SIZE]; |
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typedef struct |
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{ |
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uint8_t note; |
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int8_t length; |
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} STACK_NOTE_DATA; |
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STACK_NOTE_DATA _note_stack[2]; |
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bool _playing = false; |
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bool _playing = false; |
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uint16_t _step, _last_step, _step_edit = 0; |
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uint16_t _step, _step_edit = 0; |
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uint16_t _step_length = STEP_MAX_SIZE; |
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uint16_t _step_length = STEP_MAX_SIZE; |
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// MIDI clock, start, stop, note on and note off byte definitions - based on MIDI 1.0 Standards.
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// MIDI clock, start, stop, note on and note off byte definitions - based on MIDI 1.0 Standards.
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@ -62,6 +71,7 @@ uint8_t _button_state[6] = {1}; |
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uint16_t _pot_state[4] = {0}; |
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uint16_t _pot_state[4] = {0}; |
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uint8_t _last_octave = 3; |
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uint8_t _last_octave = 3; |
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uint8_t _last_note = 0; |
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uint8_t _last_note = 0; |
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uint8_t _bpm_blink_timer = 1; |
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void sendMidiMessage(uint8_t command, uint8_t byte1, uint8_t byte2) |
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void sendMidiMessage(uint8_t command, uint8_t byte1, uint8_t byte2) |
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{
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{
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@ -76,31 +86,35 @@ void sendMidiMessage(uint8_t command, uint8_t byte1, uint8_t byte2) |
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// Each call represents exactly one step here.
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// Each call represents exactly one step here.
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void ClockOut16PPQN(uint32_t * tick)
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void ClockOut16PPQN(uint32_t * tick)
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{ |
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{ |
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uint8_t velocity = NOTE_VELOCITY; |
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uint16_t step; |
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bool glide_ahead; |
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// get actual step.
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// get actual step.
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_step = *tick % _step_length; |
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_step = *tick % _step_length; |
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// 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.
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if ( _sequencer[_last_step].rest == false && _sequencer[_last_step].glide == false ) { |
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sendMidiMessage(NOTE_OFF, _sequencer[_last_step].note, 0); |
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} |
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// send note on only if this step are not in rest mode
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// send note on only if this step are not in rest mode
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if ( _sequencer[_step].rest == false ) { |
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if ( _sequencer[_step].rest == false ) { |
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if ( _sequencer[_step].accent == true ) { |
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sendMidiMessage(NOTE_ON, _sequencer[_step].note, _sequencer[_step].accent ? ACCENT_VELOCITY : NOTE_VELOCITY); |
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velocity = ACCENT_VELOCITY; |
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// do we have a glide ahead us?
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step = _step; |
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for ( uint16_t i = 1; i < _step_length; i++ ) { |
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++step; |
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step = step % _step_length; |
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if ( _sequencer[step].glide == true && _sequencer[step].rest == false ) { |
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_note_stack[1].note = _sequencer[_step].note; |
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_note_stack[1].length = 2 + (i * 6); |
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glide_ahead = true; |
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break; |
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} else if ( _sequencer[step].rest == false ) { |
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glide_ahead = false; |
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break; |
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} |
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} |
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sendMidiMessage(NOTE_ON, _sequencer[_step].note, velocity); |
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} |
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} |
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if ( glide_ahead == false ) { |
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// time to let glide go away? be shure to send glided note off after the actual step send his note on
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_note_stack[0].note = _sequencer[_step].note; |
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// same note? do not send note off
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_note_stack[0].length = 4; |
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if ( _sequencer[_last_step].glide == true && _sequencer[_step].note != _sequencer[_last_step].note ) { |
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} |
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sendMidiMessage(NOTE_OFF, _sequencer[_last_step].note, 0); |
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}
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}
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_last_step = _step; |
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} |
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} |
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// The callback function wich will be called by uClock each Pulse of 96PPQN clock resolution.
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// The callback function wich will be called by uClock each Pulse of 96PPQN clock resolution.
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@ -108,12 +122,46 @@ void ClockOut96PPQN(uint32_t * tick) |
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{ |
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{ |
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// Send MIDI_CLOCK to external hardware
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// Send MIDI_CLOCK to external hardware
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Serial.write(MIDI_CLOCK); |
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Serial.write(MIDI_CLOCK); |
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// handle note on stack
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if ( _note_stack[1].length != -1 ) { |
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--_note_stack[1].length; |
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if ( _note_stack[1].length == 0 ) { |
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sendMidiMessage(NOTE_OFF, _note_stack[1].note, 0); |
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_note_stack[1].length = -1; |
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} |
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}
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if ( _note_stack[0].length != -1 ) { |
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--_note_stack[0].length; |
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if ( _note_stack[0].length == 0 ) { |
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sendMidiMessage(NOTE_OFF, _note_stack[0].note, 0); |
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_note_stack[0].length = -1; |
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} |
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} |
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// time to let glide go away? be shure to send glided note off after the actual step send his note on
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// same note? do not send note off
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//if ( _sequencer[_last_step].glide == true && _sequencer[_step].note != _sequencer[_last_step].note ) {
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// sendMidiMessage(NOTE_OFF, _sequencer[_last_step].note, 0);
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//}
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// BPM led indicator
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if ( !(*tick % (96)) || (*tick == 0) ) { // first compass step will flash longer
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_bpm_blink_timer = 8; |
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digitalWrite(PLAY_STOP_LED_PIN , HIGH); |
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} else if ( !(*tick % (24)) ) { // each quarter led on
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digitalWrite(PLAY_STOP_LED_PIN , HIGH); |
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} else if ( !(*tick % _bpm_blink_timer) ) { // get led off
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digitalWrite(PLAY_STOP_LED_PIN , LOW); |
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_bpm_blink_timer = 1; |
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} |
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} |
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} |
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// The callback function wich will be called when clock starts by using Clock.start() method.
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// The callback function wich will be called when clock starts by using Clock.start() method.
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void onClockStart()
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void onClockStart()
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{ |
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{ |
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Serial.write(MIDI_START); |
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Serial.write(MIDI_START); |
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digitalWrite(PLAY_STOP_LED_PIN , LOW); |
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_playing = true; |
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_playing = true; |
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} |
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} |
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@ -121,8 +169,9 @@ void onClockStart() |
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void onClockStop()
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void onClockStop()
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{ |
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{ |
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Serial.write(MIDI_STOP); |
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Serial.write(MIDI_STOP); |
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sendMidiMessage(NOTE_OFF, _sequencer[_last_step].note, 0); |
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//sendMidiMessage(NOTE_OFF, _last_note_on, 0);
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sendMidiMessage(NOTE_OFF, _sequencer[_step].note, 0); |
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sendMidiMessage(NOTE_OFF, _note_stack[1].note, 0); |
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sendMidiMessage(NOTE_OFF, _note_stack[0].note, 0); |
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_playing = false; |
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_playing = false; |
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} |
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} |
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@ -193,6 +242,13 @@ void setup() |
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configureInterface(); |
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configureInterface(); |
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} |
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} |
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void sendPreviewNote(uint16_t step) |
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{ |
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sendMidiMessage(NOTE_ON, _sequencer[step].note, _sequencer[step].accent ? ACCENT_VELOCITY : NOTE_VELOCITY); |
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delay(200); |
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sendMidiMessage(NOTE_OFF, _sequencer[step].note, 0); |
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} |
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bool pressed(uint8_t button_pin) |
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bool pressed(uint8_t button_pin) |
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{ |
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{ |
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uint8_t value; |
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uint8_t value; |
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@ -286,6 +342,9 @@ void processPots() |
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// changes on octave or note pot?
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// changes on octave or note pot?
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if ( octave != -1 || note != -1 ) { |
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if ( octave != -1 || note != -1 ) { |
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_sequencer[_step_edit].note = (_last_octave * 8) + _last_note; |
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_sequencer[_step_edit].note = (_last_octave * 8) + _last_note; |
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if ( _playing == false ) { |
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sendPreviewNote(_step_edit); |
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} |
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} |
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} |
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step_length = getPotChanges(STEP_LENGTH_POT_PIN, 1, STEP_MAX_SIZE); |
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step_length = getPotChanges(STEP_LENGTH_POT_PIN, 1, STEP_MAX_SIZE); |
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@ -317,13 +376,19 @@ void processButtons() |
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if ( _step_edit != 0 ) { |
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if ( _step_edit != 0 ) { |
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--_step_edit; |
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--_step_edit; |
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} |
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} |
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if ( _playing == false ) { |
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sendPreviewNote(_step_edit); |
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} |
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} |
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} |
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// next step edit
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// next step edit
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if ( pressed(NEXT_STEP_BUTTON_PIN) ) { |
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if ( pressed(NEXT_STEP_BUTTON_PIN) ) { |
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if ( _step_edit < STEP_MAX_SIZE-1 ) { |
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if ( _step_edit < _step_length-1 ) { |
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++_step_edit; |
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++_step_edit; |
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} |
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} |
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if ( _playing == false ) { |
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sendPreviewNote(_step_edit); |
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}
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} |
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} |
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// step rest
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// step rest
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@ -379,13 +444,10 @@ void processLeds() |
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digitalWrite(ACCENT_LED_PIN , LOW); |
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digitalWrite(ACCENT_LED_PIN , LOW); |
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}
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}
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// Play/Stop
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// shut down play led if we are stoped
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if ( _playing == true ) { |
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if ( _playing == false ) { |
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digitalWrite(PLAY_STOP_LED_PIN , HIGH); |
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} else { |
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digitalWrite(PLAY_STOP_LED_PIN , LOW); |
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digitalWrite(PLAY_STOP_LED_PIN , LOW); |
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} |
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} |
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} |
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} |
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// User interaction goes here
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// User interaction goes here
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