Roland TB303 StepSequencer clone first draft notes...

pull/7/head
midilab 7 years ago
parent 22bd4880ac
commit 609242b8d7
  1. 140
      examples/AcidStepSequencer/AcidStepSequencer.ino

@ -0,0 +1,140 @@
#include "Arduino.h"
#include <uClock.h>
// Sequencer config
#define STEP_MAX_SIZE 16
#define SEQUENCER_MIN_BPM 50
#define SEQUENCER_MAX_BPM 178
#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
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;
// MIDI clock, start, stop, note on and note off byte definitions - based on MIDI 1.0 Standards.
#define MIDI_CLOCK 0xF8
#define MIDI_START 0xFA
#define MIDI_STOP 0xFC
#define NOTE_ON 0x90
#define NOTE_OFF 0x80
void sendMidiMessage(uint8_t command, uint8_t byte1, uint8_t byte2)
{
// send midi message
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.
void ClockOut16PPQN(uint32_t * tick)
{
uint16_t step;
// get actual step.
step = *tick % STEP_MAX_SIZE;
// 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 ) {
sendMidiMessage(NOTE_OFF, _sequencer[_last_step].note, 0);
}
// 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);
}
// time to let glide go away? be shure to send glided note off before the _last_step send his note off
// same note? do not send note off
if ( _sequencer[_last_step].glide == true && _sequencer[step].note != _sequencer[_last_step].note ) {
sendMidiMessage(NOTE_OFF, _sequencer[_last_step].note, 0);
}
_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
Serial.write(MIDI_CLOCK);
}
// The callback function wich will be called when clock starts by using Clock.start() method.
void onClockStart()
{
Serial.write(MIDI_START);
}
// The callback function wich will be called when clock stops by using Clock.stop() method.
void onClockStop()
{
Serial.write(MIDI_STOP);
}
void setup()
{
// Initialize serial communication at 31250 bits per second, the default MIDI serial speed communication:
Serial.begin(31250);
// Inits the clock
uClock.init();
// Set the callback function for the clock output to send MIDI Sync message.
uClock.setClock96PPQNOutput(ClockOut96PPQN);
// Set the callback function for the step sequencer on 16ppqn
uClock.setClock16PPQNOutput(ClockOut16PPQN);
// Set the callback function for MIDI Start and Stop messages.
uClock.setOnClockStartOutput(onClockStart);
uClock.setOnClockStopOutput(onClockStop);
// Set the clock BPM to 126 BPM
uClock.setTempo(126);
// 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;
}
// Starts the clock, tick-tac-tick-tac...
uClock.start();
}
// 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
}
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