import machine
import time

# Define the LED pins based on the mapping (GP0 to GP9 correspond to Arduino Mega pins 2-11)
led_pins = [
    machine.Pin(0, machine.Pin.OUT),  # maps Arduino Mega pin 2 -> Pico GP0
    machine.Pin(1, machine.Pin.OUT),  # maps Arduino Mega pin 3 -> Pico GP1
    machine.Pin(2, machine.Pin.OUT),  # maps Arduino Mega pin 4 -> Pico GP2
    machine.Pin(3, machine.Pin.OUT),  # maps Arduino Mega pin 5 -> Pico GP3
    machine.Pin(4, machine.Pin.OUT),  # maps Arduino Mega pin 6 -> Pico GP4
    machine.Pin(5, machine.Pin.OUT),  # maps Arduino Mega pin 7 -> Pico GP5
    machine.Pin(6, machine.Pin.OUT),  # maps Arduino Mega pin 8 -> Pico GP6
    machine.Pin(7, machine.Pin.OUT),  # maps Arduino Mega pin 9 -> Pico GP7
    machine.Pin(8, machine.Pin.OUT),  # maps Arduino Mega pin 10 -> Pico GP8
    machine.Pin(9, machine.Pin.OUT)   # maps Arduino Mega pin 11 -> Pico GP9
]

# Ensure all LEDs are initially off.
for pin in led_pins:
    pin.value(0)

while True:
    # Forward cycle: light each LED for 2 seconds
    for pin in led_pins:
        pin.value(1)      # Turn LED on
        time.sleep(2)     # Delay for 2 seconds
        pin.value(0)      # Turn LED off

    # Reverse cycle: light each LED for 2 seconds in reverse order
    for pin in reversed(led_pins):
        pin.value(1)      # Turn LED on
        time.sleep(2)     # Delay for 2 seconds
        pin.value(0)      # Turn LED off