micromidi/main.py

import time
from machine import UART
from machine import ADC
import uos

from midi.midiout import MidiOut
from midi import constants_min

from midipins import StatePin, PitchWheel
import midipins

DEBUG = 0
midiout = None

def main():
    global DEBUG
    global midiout


    led = machine.Pin(2 , machine.Pin.OUT)
    adc_pin = 0
    adc = ADC(adc_pin)

    but = machine.Pin(0, machine.Pin.IN, machine.Pin.PULL_UP)
    # wheel = PitchWheel(adc, size=128)
    pins = [
        machine.Pin(12, machine.Pin.OUT),
        machine.Pin(14, machine.Pin.OUT),
        machine.Pin(4 , machine.Pin.OUT),
        machine.Pin(5 , machine.Pin.OUT),
    ]
    volume = PitchWheel(adc.read, size=128)
    volume.pins = pins
    volume.values = [1,0,0,0]

    modeswitch = PitchWheel(adc.read, size=6)
    modeswitch.pins = pins
    modeswitch.values = [0,0,0,0]

    reset_midi()
    print("\nWaiting for Interrupt....")
    time.sleep(3)


    if but.value() == 1:
        DEBUG = 0
    else:
        DEBUG = 1

    midipins.DEBUG = DEBUG

    if not DEBUG:
        print("\nDetaching Terminal for MIDI....")
        uos.dupterm(None, 1)
        uart = UART(0, baudrate=115200)
        midiout = MidiOut(uart)
        midiout.all_notes_off()
        midiout.all_sound_off()
        # midiout.reset_all_controllers()
        midiout.program_change(0)  # Acoustic Piano per General MIDI standard
        # midiout.control_change(constants_min.LEGATO_ONOFF,   0)
        # midiout.control_change(constants_min.LEGATO_ONOFF, 127)

    # # Send all sound off to prevent hanging notes
    TNULL =  time.ticks_ms()
    TONE = None
    while True:
        time.sleep_ms(1)
        led.value(0 if DEBUG else 1)
        modeswitch.poll(set_mode)
        volume.poll(lambda v:midiout.volume(v))
        if DEBUG:
            TONE = time.ticks_ms()
            print("Poll done:", TONE - TNULL)
            TNULL = TONE
        # wheel.poll(lambda v:midiout.channel_message(constants_min.PROGRAM_CHANGE,(v+1)))
        # wheel.poll(midiout.pitch_bend)


def set_mode(val):
    global DEBUG
    global midiout
    if val == 4:
        import uos
        uos.dupterm(None, 1)
        DEBUG = 0
    elif val == 5:
        import machine
        import uos
        uart = machine.UART(0, 115200)
        uos.dupterm(uart, 1)
        DEBUG = 1
    if val < 5:
        midiout.program_change(val)
    midipins.DEBUG = DEBUG


def midi_note(midiout, val, note=64, led = None):
    if led:
        led.value(val)
    if val == 0:
        midiout.note_on(note, velocity=100)
    else:
        midiout.note_off(note)

def reset_midi():
    import machine
    import uos
    uos.dupterm(None, 1)
    uart = machine.UART(0, 115200)
    mdo = MidiOut(uart)
    mdo.all_notes_off()
    mdo.all_sound_off()
    # mdo.reset_all_controllers()

    uart = machine.UART(0, 115200)
    uos.dupterm(uart, 1)



if __name__ == "__main__":
    try:
        main()
    except Exception as ex:
        reset_midi()
        raise ex