from machine import Pin, Timer
from time import sleep

# GPIO pins for 7-segment display segments (a-g)
pins = [Pin(32, Pin.OUT), Pin(33, Pin.OUT), Pin(25, Pin.OUT), Pin(26, Pin.OUT),
        Pin(27, Pin.OUT), Pin(12, Pin.OUT), Pin(14, Pin.OUT)]

# Digit patterns for 7-segment display
digits = [
    [0, 0, 0, 0, 0, 0, 1],  # 0
    [1, 0, 0, 1, 1, 1, 1],  # 1
    [0, 0, 1, 0, 0, 1, 0],  # 2
    [0, 0, 0, 0, 1, 1, 0],  # 3
    [1, 0, 0, 1, 1, 0, 0],  # 4
    [0, 1, 0, 0, 1, 0, 0],  # 5
    [0, 1, 0, 0, 0, 0, 0],  # 6
    [0, 0, 0, 1, 1, 1, 1],  # 7
    [0, 0, 0, 0, 0, 0, 0],  # 8
    [0, 0, 0, 0, 1, 0, 0]   # 9
]

# Variables for stopwatch
seconds = 0
running = False

def update_display():
    """Update 7-segment display to show the current digit."""
    digit = seconds % 10
    for j in range(7):
        pins[j].value(digits[digit][j])

def timer_callback(tmr):
    """ timer callback function to update the time and display."""
    global seconds
    if running:
        seconds += 1
        print(f"Stopwatch: seconds={seconds}")
    update_display()

# Setup a Timer
timer = Timer(0)
# The timer period is set to 1000 milliseconds (1 second)
timer.init(period=1000, mode=Timer.PERIODIC, callback=timer_callback)

# Setup Push Button
button = Pin(16, Pin.IN, Pin.PULL_UP)

# Main loop
while True:
    # Poll button state
    if not button.value():  # Button is pressed
        running = not running
        print("Button pressed: Stopwatch running" if running else "Button pressed: Stopwatch stopped")
        sleep(0.5)  # Debounce delay
    sleep(0.1)  # Sleep to reduce CPU usage