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问题是偶发性，有时出现一个情况 host端无法个954 i2c无法通信，host无法发起start信号？ 导致DS90UB954没有法配置通讯.
1. 问题一，DS90UB954 出现异常是否会拉低IIC信号？
2.出现问题时软件复位主控，iic复位不了，是否有办法复位DS90UB954芯片?
