IW612 BT Uart signal quesiton

[Moore_Lin]

Hello 

I have a question about the UART 

We use the STM32MP1 as Host and connect to IW612 Bluetooth via Uart interface. 

We found randomly the uart fail to hciattach.

Now we try to verify the signal of RX(IW612 to Host) and RTS(Host to IW612) by analyzer.

We found when RTS desassert by Host , there's still 2bits data on bus.

Then RX stop to transmit. 

Please refer to signal in below

Could you please confirm if such signal(RX and RTS) is correct?

Thanks

Regards

Moore Lin

[shaun_wu]

Hello @Moore_Lin 

You may share bit rate of hciattach.

Could you share terminal logs of hciattach?

Could you check uart connection correctly, you may share with us then we will help check.

Best Regards

Shaun