# 导入模块
from machine import I2C, Pin
import ssd1306
import time

# 定义引脚
i2c = I2C(0, scl=Pin(32), sda=Pin(33), freq=400000)
btn = Pin(18, Pin.IN, Pin.PULL_UP)
oled = ssd1306.SSD1306_I2C(128, 64, i2c)

x, y = 0, 0
status = 0

# 显示hello world
oled.fill(0)
oled.text("Hello, World!", x, y) 
oled.show()

# 按下按键，字符串向下移动
while True:
    if btn.value() == 0:
        time.sleep_ms(10)
        if btn.value() == 0 and status == 0:
            y += 10
            oled.fill(0) 
            oled.text("Hello, World!", x, y)
            oled.show()
            if y >= 50: 
                y = 0 
                oled.show()
            status = 1
    else:
        status = 0