from machine import Pin
import time

# Define pins for encoder input
pinA = Pin(12, Pin.IN)
pinB = Pin(13, Pin.IN)

# Initialize variables for encoder state and position
encoder_state = 0
encoder_position = 0

def encoder_callback(pin):
    global encoder_state, encoder_position
    
    # Determine which pin triggered the interrupt
    pinA_state = pinA.value()
    pinB_state = pinB.value()
    
    # Update encoder state based on transition
    if pin == pinA and pinA_state != pinB_state:
        encoder_state = (encoder_state << 2) | 1
    elif pin == pinB and pinA_state == pinB_state:
        encoder_state = (encoder_state << 2) | 2
    else:
        encoder_state = 0
    
    # Update encoder position based on encoder state
    if encoder_state in [0b0010, 0b0111, 0b1101, 0b1000]:
        encoder_position += 1
    elif encoder_state in [0b0001, 0b1110, 0b1010, 0b0101]:
        encoder_position -= 1

    if encoder_position == 1:
        print("正转")
    elif encoder_position == -1:
        print("反转")

# Attach interrupt handlers to encoder pins
pinA.irq(trigger=Pin.IRQ_RISING | Pin.IRQ_FALLING, handler=encoder_callback)
pinB.irq(trigger=Pin.IRQ_RISING | Pin.IRQ_FALLING, handler=encoder_callback)

while True:
    pass