import time
import board
import digitalio

# Define 7 segment pins 
segments = {
    'a': digitalio.DigitalInOut(board.GP16),
    'b': digitalio.DigitalInOut(board.GP17),
    'c': digitalio.DigitalInOut(board.GP18),
    'd': digitalio.DigitalInOut(board.GP19),
    'e': digitalio.DigitalInOut(board.GP20),
    'f': digitalio.DigitalInOut(board.GP21),
    'g': digitalio.DigitalInOut(board.GP22),
}

# Set all pins as output 
for seg in segments.values():
    seg.direction = digitalio.Direction.OUTPUT

# Digit patterns (1=ON, 0=OFF) for a Common Cathode Display [cite: 35, 40, 41]
digits = {
    0: (1, 1, 1, 1, 1, 1, 0),
    1: (0, 1, 1, 0, 0, 0, 0),
    2: (1, 1, 0, 1, 1, 0, 1),
    3: (1, 1, 1, 1, 0, 0, 1),
    4: (0, 1, 1, 0, 0, 1, 1),
    5: (1, 0, 1, 1, 0, 1, 1),
    6: (1, 0, 1, 1, 1, 1, 1),
    7: (1, 1, 1, 0, 0, 0, 0),
    8: (1, 1, 1, 1, 1, 1, 1),
    9: (1, 1, 1, 1, 0, 1, 1),
}

# Maintain order of segments 
segment_keys = ['a', 'b', 'c', 'd', 'e', 'f', 'g']

# Function to display the digit 
def display_digit(num):
    pattern = digits[num]
    for i, seg in enumerate(segment_keys):
        segments[seg].value = pattern[i]

# Main loop to count from 0 to 9 
while True:
    for i in range(9, -1, -1):
        print("Displaying:", i)
        display_digit(i)
        time.sleep(1)