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下面是波形图，黄线是sda，蓝线是sck，各位看看有啥问题，为什么读出都是0xff啊？
I2C 从机地址不对的话，会一直输出0xFF. 检查下地址。
地址是0
从0~7都试过了，都是输出0xFF。
看图中显示 送完地址后，ads1110没有回ack。
地址从0~7都试过了，一样的效果。
