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BQ40Z80使用IIC总线,通信失败,资料回传为0

Other Parts Discussed in Thread: EV2400

本人使用STM32F407

因使用硬体IIC一直无法成功,改用GPIO软体模拟IIC通信

1.IIC发送器件地址0x16,写操作,收到应答信号

2.IIC发送器件地址0x09命令,收到应答信号

3.IIC发送器件地址0x16,读操作,收到应答信号

4.资料回传皆为0

这是时序没错啊,怎么就收不到应答。

求IT大神指点一下~谢谢