from picozero import Speaker
from machine import Pin
from utime import sleep
from time import ticks_ms

push_bt1 = Pin(0, Pin.IN, Pin.PULL_UP)
push_bt2 = Pin(1, Pin.IN, Pin.PULL_UP)

# creating a Speaker object
speaker = Speaker(16)

# global value
button1_is_pressed = False
button2_is_pressed = False
debounce_time=0
DEBOUNCE_WAIT_TIME=500
speaker_freq = 500
speaker_is_playing = False

# Interrupt Service Routine for Button Pressed Events with debounce
def button1_pressed(pin):
    global button1_is_pressed
    global debounce_time
    if (ticks_ms() - debounce_time) > DEBOUNCE_WAIT_TIME:
        button1_is_pressed = True
        debounce_time=ticks_ms()

def button2_pressed(pin):
    global button2_is_pressed
    global debounce_time
    if (ticks_ms() - debounce_time) > DEBOUNCE_WAIT_TIME:
        button2_is_pressed = True
        debounce_time=ticks_ms()


# here is how we associate the falling value on the input pin with the callback function
push_bt1.irq(handler=button1_pressed, trigger=Pin.IRQ_FALLING)
push_bt2.irq(handler=button2_pressed, trigger=Pin.IRQ_FALLING)

while True:
    if (button2_is_pressed == True):
        button2_is_pressed = False
        if (speaker_is_playing == False):
            speaker_is_playing = True
            speaker.play(tune=speaker_freq, duration=1, volume=1, n=None, wait=False)
        else:
            speaker_is_playing = False
            speaker.off()
     
    
    if (button1_is_pressed == True):
        button1_is_pressed = False
        if (speaker_freq == 10000):
            speaker_freq = 500
        else: 
            speaker_freq +=500
        if (speaker_is_playing == True):
            speaker.play(tune=speaker_freq, duration=1, volume=1, n=None, wait=False)
    
    sleep(0.05)