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BQ769x0系列芯片，I2C通信为从机配置，极端条件下可能发生总线死锁（SCL高，SDA低），从机将SDA拉低，并等待主机SCL信号，但主机未继续发送SCL信号，并等待SDA拉高，形成死锁。此时主机如何操作可以使总线恢复正常？
参考I2C scratch的工作模式。
