# extremely crude MicroPython MIDI demo
# MicroPython / Raspberry Pi Pico - scruss, 2022-08
# see https://github.com/bixb922/umidiparser
 
import umidiparser
from time import sleep_us
from machine import Pin, PWM
 
# pin 26 - GP20; just the right distance from GND at pin 23
#  to use one of those PC beepers with the 4-pin headers
pwm = PWM(Pin(15))
led = Pin('LED', Pin.OUT)
 
 
def play_tone(freq, usec):
    # play RTTL/midi notes, also flash onboard LED
    # original idea thanks to
    #   https://github.com/dhylands/upy-rtttl
    print('freq = {:6.1f} usec = {:6.1f}'.format(freq, usec))
    if freq > 0:
        pwm.freq(int(freq))       # Set frequency
        pwm.duty_u16(32767)       # 50% duty cycle
    led.on()
    sleep_us(int(0.9 * usec))     # Play for a number of usec
    pwm.duty_u16(0)               # Stop playing for gap between notes
    led.off()
    sleep_us(int(0.1 * usec))     # Pause for a number of usec
 
 
# map MIDI notes (0-127) to frequencies. Note 69 is 440 Hz ('A4')
freqs = [440 * 2**((float(x) - 69) / 12) for x in range(128)]
 
for event in umidiparser.MidiFile("lg2.mid", reuse_event_object=True):
    if event.status == umidiparser.NOTE_OFF and event.channel == 0:
        play_tone(freqs[event.note], event.delta_us)