import machine
import utime
utime.sleep(0.1) # Wait for USB to become ready

# internal LED definition
led_onboard = machine.Pin(25, machine.Pin.OUT)

# input definition
# switch is in pull_down configuration
big_blue_button_1 = machine.Pin(5, machine.Pin.IN, machine.Pin.PULL_DOWN)

# variables
BBB_previous_state = False
press_count = 0

#debounce related
last_time = utime.ticks_ms() # the last time the button is pressed
debounce_time = 0 #ms expected debounce time in [ms]

#functions
#no debounce check
def check_button_wo_debounce():
    global BBB_previous_state, press_count
    BBB_current_reading = big_blue_button_1.value()

    if (BBB_current_reading == True) and (BBB_previous_state == False):
        BBB_previous_state = BBB_current_reading
    elif (BBB_current_reading == False) and (BBB_previous_state == True):
        press_count += 1
        BBB_previous_state = BBB_current_reading


#debounce check
def check_button_with_debounce():
    global BBB_previous_state, press_count, last_time, debounce_time
    BBB_current_reading = big_blue_button_1.value()

    if (BBB_current_reading == True) and (BBB_previous_state == False):
        new_time = utime.ticks_ms()
        if utime.ticks_diff(new_time, last_time) > debounce_time:
            BBB_previous_state = BBB_current_reading
            last_time = new_time
    elif (BBB_current_reading == False) and (BBB_previous_state == True):
        new_time = utime.ticks_ms()
        if utime.ticks_diff(new_time, last_time) > debounce_time:
            press_count += 1
            BBB_previous_state = BBB_current_reading
            last_time = new_time


#main loop
print("Hello, Pi Pico!")
while True:
    led_onboard.value(1)
    #check_button_wo_debounce()
    check_button_with_debounce()
    if press_count == 3:
        break

# ending
print(press_count, "   ")
led_onboard.value(0)
print("Finished!")