from machine import Pin
import time

# LED pins (LSB = GP2, MSB = GP9)
led_pins = [2, 3, 4, 5, 6, 7, 8, 9]
leds = [Pin(p, Pin.OUT) for p in led_pins]

# Buttons
toggle_btn = Pin(10, Pin.IN, Pin.PULL_DOWN)
rotate_btn = Pin(11, Pin.IN, Pin.PULL_DOWN)

# Initial value (0–255)
value = 0

# Previous states for edge detection
last_toggle = 0
last_rotate = 0

# Function to display binary on LEDs
def update_leds(val):
    for i in range(8):
            bit = (val >> i) & 1   # extract each bit
                    leds[i].value(bit)

                    while True:
                        t = toggle_btn.value()
                            r = rotate_btn.value()

                                #Toggle LSB (rightmost bit)
                                    if t == 1 and last_toggle == 0:
                                            value ^= 1   # flip LSB
                                                    print("Value:", value)
                                                            time.sleep(0.2)  # debounce

                                                                #Circular right shift
                                                                    if r == 1 and last_rotate == 0:
                                                                            lsb = value & 1
                                                                                    value = (value >> 1) | (lsb << 7)
                                                                                            print("Value:", value)
                                                                                                    time.sleep(0.2)  # debounce

                                                                                                        last_toggle = t
                                                                                                            last_rotate = r

                                                                                                                update_leds(value)
                                                                                                                    time.sleep(0.05)