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python
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from machine import Pin, I2C
i2c = I2C(scl=Pin('X1'), sda=Pin('X2'))
dev_list = i2c.scan() # 鎵弿I2C璁惧鍒楄〃
i2c.writeto(0x42, b'4') # 鍚戣澶0x42鍐欏叆鏁版嵁
data = i2c.readfrom(0x42, 4) # 浠庤澶0x42璇诲彇鏁版嵁
i2c.writeto_mem(0x42, 0x12, b'') # 鍚戣澶0x42鐨0x12鍦板潃鍐欏叆鏁版嵁
data = i2c.readfrom_mem(0x42, 0x12, 2) # 浠庤澶0x42鐨0x12鍦板潃璇诲彇鏁版嵁
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